rexroth hydraulic pump adjustment manufacturer
Rexroth’s complete line of hydraulic pumps serve virtually every industry in manufacturing and technology applications such as railway engineering, chemical process plants, power and environmental engineering, automotive engineering, plastics processing machinery, paper industry, presses, test rigs and simulation systems, marine/offshore engineering, special projects, and civil/water engineering, transportation technology, and machine tools.
Pursuing a comprehensive understanding of these application areas and working closely with customers, our engineers have developed unique electrohydraulic innovations in control technology. The result is hydraulic pumps with greater precision, dependability, and reliability.
Keeping a market expectations mindset, Bosch Rexroth is setting a new standard for hydraulic pumps with continuous development at the highest standards and quality. Rexroth pumps are designed for high reliability and efficiency.
The lineup of pumps includes: Axial Piston Pumps, External Gear Pumps, Internal Gear Pumps, Gerotor Pumps, Vane Pumps, Radial Piston Pumps and Electro-hydraulic Pumps.
Rexroth pumps are designed as a solution point of view where the products are compatible with each other in order to provide a whole portfolio for our customers.
To help keep your systems operating safely and at maximum efficiency, Rexroth offers a wide range of pump accessories. Replacement seals, safety valve, mounting flanges, brackets, and adapters make installation easier and faster.
Continuous development within hydraulic pumps industry and latest technologies at the highest level of development Bosch Rexroth will always provide the best matched reliable products for your business.
We carry a large selection of Bosch Rexroth hydraulics pumps, motors & more. If you can’t find the Rexroth Pump you’re looking for or you need a Bosch Rexroth hydraulics pump repair, contact us today!
We can supply what you need or repair what you have. Before purchasing, there may be a good chance that your current Bosch Rexroth hydraulic pump or motor can be repaired. Bosch Rexroth hydraulics repairs and motor repairs come with our two year warranty.
When purchasing, consider remanufactured Bosch Rexroth hydraulics or after-market hydraulic units. They can get you back up and running for less than the cost of a new Bosch Rexroth hydraulic unit. We will give you a free quote so you can compare costs for a new, repaired or re-manufactured Bosch Rexroth unit, saving you money without compromising the results of your Bosch Rexroth hydraulic unit.
In 1795, the Rexroth family established an iron forge in Spessart, Germany. However, it wasn’t until 1952 that they began producing standardized hydraulic components and hydraulics. In 1953 they invented the first industrialized gear pump for mobile machines. Later, in 1972, Rexroth launched the first hydraulic servo valve onto the market and became a wholly-owned subsidiary of Mannesmann AG in 1975. They developed the world’s first maintenance-free AC servomotor in 1979, revolutionizing the mechanical engineering industry. Throughout the 90s Rexroth continued to grow and revolutionize the industry, launching inventions used in a variety of industries. Mannesmann Rexroth AG and Bosch Automation Technology merged to form Bosch Rexroth in 2001 and today, Bosch Rexroth is one of the leading specialists in drive and control technologies.
Axial piston pumps: intended for the medium and high-pressure range and come in a variety of designs, performance ranges, and adjustment options for mobile, stationary and industrial applications.
Bosch Rexroth units we commonly stock in new, remanufactured or aftermarket are: A10V, V3, V4, V5, V6, V7, RPV, PVQ, VPV, PSV, PVF, PVK, PVQ, PVS, PVT, 20L, 20H, E055, 80L, 80M, 80H.
Bosch Rexroth hydraulic motors are known for their reliability, long life cycles, low noise emissions, as well as high efficiency, and cost-effectiveness. The range is available in swashplate or bent axis designs which are used in medium and high-pressure applications. They have several models including:
Bosch Rexroth hydraulics offers a range of hydraulic “on/off” valves including isolator valves, directional valves, pressure valves, flow control, and throttle valves, and directional cartridge valves.
Directional valves:control the flow and direction of movement or rotation of hydraulic actuators which include directional seat or spool valves, direct operated or pilot operated valves.
Variable-displacement pumps are used in hydraulic systems where the flow requirements vary. This usually means the system has several actuators and, depending on the current cycle of the machine, the number of actuators moving at a given time will fluctuate. The most common type of variable-displacement pump is the pressure-compensating pump.
Pressure-compensating pumps are designed to deliver only the amount of flow required by the system to maximize efficiency and avoid heat generation. The compensator is adjusted to a pressure somewhat higher than that required to move the system’s heaviest load.
A pressure-compensating pump will deliver its maximum flow until the system pressure reaches the compensator setting. Once the compensator setting is reached, the pump will be de-stroked to deliver only the amount of flow that will maintain the compensator setting in the line.
Whenever more flow is demanded by the system (such as would occur when an additional actuator begins to move), the pump will increase its stroke to meet the new flow demand. Whenever the system flow needs to decrease (such as when one or more actuators are stopped), the pump stroke is reduced.
When the system is stopped completely, the pump stroke is reduced almost to zero. It will stroke only a very small amount or whatever is required to maintain the compensator setting in the line, overcoming any system bypassing or leaks. While a pressure-compensating pump is efficient, the standby pressure remains high.
Adjusting a pressure-compensating pump is quite simple. With all flow blocked and the system idle, the compensator valve is adjusted to the desired pressure. However, some pressure-compensating pumps have two valves mounted on the pump body.
The two adjustments can look nearly identical. This type of pressure-compensating pump is called a load-sensing pump. The second adjustment is called either a “load-sensing” valve or “flow-compensator” valve.
A load-sensing pump is designed to reduce its pressure to a much lower standby level whenever the system is idle. This can conserve energy and reduce heat and wear in systems that spend a significant amount of time in an idle condition.
The two separate pressure adjustments allow setting the compensator valve to the required maximum system pressure and the load-sensing adjustment to a much lower standby pressure.
Whenever the system is moving a load, the high-pressure adjustment limits the system pressure. For instance, as a cylinder is extended, pressure in the system will build as necessary to move the load. Eventually, the cylinder reaches the end of its stroke, and flow is blocked.
Most load-sensing systems have a pump-loading directional-control valve of some sort that can place the system in an idle condition until it is necessary to move another load. When the pump-loading valve is shifted, the system pressure drops to the much lower load-sensing valve setting.
A load-sensing valve usually is smaller than the compensator valve and typically mounted directly on top of the compensator. The compensator valve is closer to the pump. The load-sensing valve is factory preset and normally does not need to be adjusted during the initial pump setup. In most pumps, the factory preset is approximately 200-300 pounds per square inch (psi).
The most common reason to adjust a load-sensing valve is because someone unfamiliar with the pump has mistakenly attempted to set the maximum system pressure by adjusting the load-sensing valve instead of the compensator. This not only can result in unstable system pressure but in some cases can also void any warranty on the pump.
A typical configuration of a pressure-compensating pump is shown in Figure 1. A pump-loading valve is used to determine whether the system is idle or prepared to move a load. The pump-loading valve is de-energized whenever the system is idle.
Pilot pressure on the left-hand side of the load-sensing valve is then released to the tank. The pilot line on the right-hand side of the load-sensing valve is connected to the pressure line at the pump outlet. System pressure shifts the load-sensing valve and directs pressure to reduce the pump stroke so that system pressure drops to the load-sensing setting of 300 psi, as illustrated in Figure 2.
When a load is to be moved, the pump-loading valve is energized. This directs pilot pressure to the left side of the load-sensing valve, keeping it from shifting. System pressure shifts the compensator valve to de-stroke the pump exactly the amount necessary to limit system pressure to the compensator setting, 3,000 psi as shown in Figure 3.
To make the pressure settings, always adjust the load-sensing valve first. The pump should be deadheaded by closing the manual hand valve. With the pump-loading valve de-energized, pressure will build only to the current setting of the load-sensing valve. Adjust the load-sensing valve to the desired pressure.
Once the load-sensing valve is set, energize the pump-loading valve. System pressure will then build to the current compensator setting. Adjust the compensator to the desired setting. Open the manual valve, and the system can be placed back into service.
Jack Weeks is a hydraulic instructor and consultant for GPM Hydraulic Consulting. Since 1997 he has trained thousands of electricians and mechanics in hydraulic troubleshooting methods. Jack has...
Rexroth’s complete line of hydraulic pumps serve virtually every industry in manufacturing and technology applications such as railway engineering, chemical process plants, power and environmental engineering, automotive engineering, plastics processing machinery, paper industry, presses, test rigs and simulation systems, marine/offshore engineering, special projects, and civil/water engineering, transportation technology, and machine tools.
Keeping a market expectations mindset and being one of the leading Rexroth hydraulic pump distributors, we carry a wide range of Rexroth Hydraulic pump, motors and spare parts that enable us to supply and repair throughout their entire range.
Available in swash plate and bent axis design for medium and high pressure applications. A wide choice of designs, performance ranges, and adjustment options make them suitable for a mobile and stationary applications.
External gear pumps are cost-effective displacement pumps, available in many different versions. Rexroth external gear pumps are built in four frame sizes: Platform B, F, N and G.
Internal gear pumps can be used up to a continuous pressure of 315 bar (depending on the frame size). This pump principle features a compact design with particularly high energy density.
Gerotor pumps are used in the low-pressure range up to 15 bar. They are often used in connection with other Rexroth pumps in cooling, filter or lubrication circuits.
Radial piston pumps are characterized by very high operating pressures of up to 700 bar. The volume flows of the individual pistons can be used for various tasks.
EHP series drive unit for vehicles and material handling systems. Electric motor and pump can be combined according to the required performance, guaranteeing.
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Metering pumps, also known as metering pumps or proportional pumps, are a type of process that can meet a variety of stringent process requirements. The flow rate can be adjusted steplessly within a range of 0-100% to transport liquids, especially corrosive liquids. Special volumetric pump. The metering pump is a reciprocating positive displacement pump, used for accurate metering. It usually requires the stability of the metering pump to be no more than ±1%. With the continuous development of the modern industry towards automatic operation and long-distance automatic control, the metering pump has strong compatibility and adaptability to a wide range of media as liquid. The pump A7VK is designed for pumping polyurethane components in open and closed design.
In recent years, with the development of the foaming machine industry, more stringent requirements have been put forward for the performance of foaming machine pumps. In order to meet the new requirements of market development, the new generation of Rexroth A7VK metering pumps includes 12 and 28 displacement specifications. The pump adopts manual control mode. When the handwheel is rotated, the threaded rod is also rotated and the variable swash plate of the pump is adjusted steplessly, so the displacement changes in the range of small Vgmin to Vgmax. The precision adjustment display is built into the handwheel. The A7VK"s curved housing design makes the structure more compact and reduces costs. The pump enhances corrosion resistance through the special surface treatment of the housing; two-way shaft seals and flushing chambers made of special materials identify hazards and protect the environment; the pump adopts a closed pump design with the same size of the high pressure port and the low pressure port, making The separation of the feed chamber and the housing allows the pump to be used in applications with a high viscosity of 5000-7000 mm2/s and a high inlet pressure of 1-30 bar. When there are special requirements for polyurethane products and high-viscosity media must be used for compounding, A7VK is an excellent choice and can solve the problem of high-viscosity and accurate ingredients that have been plaguing customers for a long time. Due to the special optimization of the structure, the A7VK emits heat quickly, which is conducive to controlling the temperature rise and ensuring the stability of the viscosity, thereby ensuring the high accuracy of the ingredient ratio. The Rexroth A7VK is an alternative to A2VK, which uses the same mounting flange and driveshaft as the A2VK, thus improving the replacement. This new metering pump has been recognized by mainstream customers in the industry. It is believed that with the promotion and use of A7VK with higher cost performance, Rexroth can better meet the requirements of more users in the foaming machine industry.
Rexroth metering pump A7VK replacement for Rexroth A2VK pump, you will get the competitive price from HEASH TECHNIQUE B.V., who is service to the world for hydraulic components. welcome visit our website and inquiry us! Rexroth metering pump A7VK series as A7VKG012, A7VKG028, A7VKG055, A7VKG107, A7VKO012, A7VKO028, A7VKO055, A7VKO107.
- The pump has excellent performance, in which the diaphragm metering pump does not leak, high safety performance, accurate measurement and delivery, flow can be adjusted from zero to a large range of fixed values, pressure can be arbitrarily selected from the normal pressure to the allowable range.
- The pump has many varieties, full performance, suitable for conveying -30 to 450 degrees, viscosity is 0-800mm/s, high discharge pressure can reach 64Mpa, flow range is 0.1-20000L/h, measurement accuracy is within ±1%.
- According to the process requirements, the pump can be manually adjusted and frequency-adjusted to regulate the flow. It can also realize remote control and computer automatic control.
Hydraulic pumps are used in many different industries, such as construction and agriculture. They’re used to push liquids, slurries and gases though a process where they change direction and speed. This is done by changing the pressure that a fluid exerts on a hydraulic pump or cylinder. Since hydraulic motors are used for working fluids with lots of inertia properties, their control is very critical. A hydraulic system does not operate properly if you force it to do too much work unless there is enough room for the pump output pressure to drop below its required value. By adjusting the output pressure in this way you can make sure that the system works at maximum efficiency therefore helping prevent breakdowns.
A hydraulic pump is a machine used to move fluid. The fluid is usually hydraulic oil or water, but it can also be other types of fluid. When the hydraulic pump is working, the pressure in the fluid inside the pump is higher than the atmospheric pressure. This means that the fluid inside the pump is under a lot of pressure and can push things around. If you want to use the pump to move something, you need to make sure that the pressure in the fluid is at the right level.
The pressure in a hydraulic system can be adjusted using a valve called a relief valve. Relief valves are usually found on the outlet of a hydraulic system. When you operate a relief valve, you are lowering the pressure in the system by releasing some of the pressure from the system. This reduces the amount of force that needs to be used to move something and makes it easier for you to operate the pump.
There are different ways to adjust pressure in a hydraulic system. One way is to use an adjusting screw on a relief valve. Another way is to use an accumulator tank (a container that holds hydraulic oil). You can open or close the accumulator tank using hand levers or an electrical controller.
A hydraulic pump is a mechanical device used to transfer fluid from one container to another. It is important to adjust the pressure of the hydraulic pump in order to maintain consistent flow rates and pressure levels.
One of the most common reasons for needing to adjust the output pressure of a hydraulic pump is when the fluid level in the reservoir falls below the pump’s operating level. In some cases, the pump may operate at a higher pressure than necessary, leading to wear and tear on components.
Adjust the output pressure of a hydraulic pump is an important step to take, especially when it comes to your lawnmower. Even if you know what type of motor you own, you have to make sure that your engine will be able to work with that pressure. The mechanical components and settings required for adjusting your engine may differ depending on the model you own but most models have similar things in common.
Adjusting the output pressure of a hydraulic pump can be a hassle, but it’s not too difficult. The pump pressure adjusting screw is usually located on the front or back of the pump. To adjust the output pressure, first locate the screw. Once you find the screw, turn it until you get the desired output pressure. You can find a chart to help you calculate the output pressure of your hydraulic pump by visiting our Equipment and Tools section.
Fill the tanks with hydraulic oil. Before you adjust anything, fill the tank with the appropriate hydraulic fluid based on your application’s specifications. If you’re unsure what type of fluid your application requires, contact an equipment dealer or refer to your vehicle’s owner’s manual for information.
When the hydraulic pump is used, the pressure in the system will increase. This pressure is necessary to operate the pump and can be dangerous if not released. To release the pressure, open the valve on the pump.
2: Remove the cap on the pump discharge line, turn the adjustment screw until the desired output pressure is reached, replace the cap and tighten the locknut.
When you are finished adjusting the output pressure, turn the adjusting screw one more time in the same direction to lock it in place. Be sure to read and follow the instructions that came with your hydraulic pump before making any adjustments.
Adjusting a hydraulic pump’s output pressure is an important task for ensuring proper performance of your machine. When you are finished adjusting the output pressure, turn the adjusting screw one more time in the same direction to lock it in place. Be sure to read and follow the instructions that came with your hydraulic pump before making any adjustments.
If the hydraulic pump is not providing the desired output pressure, it may be necessary to adjust the output pressure. This can be done by adjusting the compression or output valves.
To adjust the compression valve, remove the cap and turn the adjustment screw until the desired output pressure is reached. To adjust the output valve, turn it clockwise or counterclockwise to change the output pressure.
Adjusting a hydraulic pump output pressure can help optimize its performance and prolong the life of the pump. By properly adjusting the output pressure, operators can ensure that the hydraulic system is functioning at its best while minimizing wear and tear.
Automation GradeAutomaticBosch Hydraulic Pump catalog Bosch Hydraulic Pump manual Bosch Hydraulic Pump manufacturer Bosch Hydraulic Pump repair Bosch Hydraulic Pump seal kit Bosch Hydraulic Pump s uk Bosch Rexroth electro Hydraulic Pump Bosch Rexroth Hydraulic gear Pump Bosch Rexroth Hydraulic piston Pump Bosch Rexroth Hydraulic Pump Bosch Rexroth Hydraulic Pump efficiency Bosch Rexroth Hydraulic Pump repair Bosch Rexroth Hydraulic vane Pump s Bosch Rexroth variable displacement Hydraulic Pump eckerle Rexroth Hydraulic Pump high pressure Hydraulic Pump Rexroth Hydraulic Pump not Pump ing oil Hydraulic Pump Rexroth pricemannesmann Rexroth Hydraulic Pump Rexroth 7930 Hydraulic Pump pdf Rexroth a10 Hydraulic Pump Rexroth closed loop Hydraulic Pump Rexroth electro Hydraulic Pump Rexroth gear Pump catalogue pdf Rexroth gear Pump f002 Rexroth gear Pump india Rexroth gear Pump manufacturer india Rexroth gear Pump mnr Rexroth gear Pump mnr 0510 Rexroth germany Hydraulic Pump Rexroth Hydraulic axial piston Pump Rexroth Hydraulic gear Pump Rexroth Hydraulic gear Pump pdf Rexroth Hydraulic hand Pump Rexroth Hydraulic motor catalogue pdf Rexroth Hydraulic motor with brake Rexroth Hydraulic piston Pump Rexroth Hydraulic Pump Rexroth Hydraulic Pump 7878 specs Rexroth Hydraulic Pump a10v Rexroth Hydraulic Pump a10vo series user manual Rexroth Hydraulic Pump a10vso Rexroth Hydraulic Pump a10vso series user manual Rexroth Hydraulic Pump a10vso140 Rexroth Hydraulic Pump a11vo Rexroth Hydraulic Pump a4vg125 Rexroth Hydraulic Pump a4vg71 Rexroth Hydraulic Pump aa10vso Rexroth Hydraulic Pump adjustment Rexroth Hydraulic Pump assembly Rexroth Hydraulic Pump authorised dealer in india Rexroth Hydraulic Pump catalog Rexroth Hydraulic Pump china Rexroth Hydraulic Pump compensator Rexroth Hydraulic Pump control Rexroth Hydraulic Pump cost Rexroth Hydraulic Pump coupling Rexroth Hydraulic Pump d-72160 horb Rexroth Hydraulic Pump d-89275 Rexroth Hydraulic Pump dealer Rexroth Hydraulic Pump dealers in ahmedabad Rexroth Hydraulic Pump dealers in bangalore Rexroth Hydraulic Pump dealers in chennai Rexroth Hydraulic Pump dealers in delhi Rexroth Hydraulic Pump dealers in hyderabad Rexroth Hydraulic Pump dealers in india Rexroth Hydraulic Pump dealers in mumbai Rexroth Hydraulic Pump dealers in pune Rexroth Hydraulic Pump dealers kolkata Rexroth Hydraulic Pump distributors Rexroth Hydraulic Pump Rexroth Hydraulic Pump in uae Rexroth Hydraulic Pump india Rexroth Hydraulic Pump installation Rexroth Hydraulic Pump ireland Rexroth Hydraulic Pump Malaysia Rexroth Hydraulic Pump manual Rexroth Hydraulic Pump manufacturers Rexroth Hydraulic Pump near me Rexroth Hydraulic Pump parts Rexroth Hydraulic Pump pdf Rexroth Hydraulic Pump ppt Rexroth Hydraulic Pump pressure adjustment Rexroth Hydraulic Pump price Rexroth Hydraulic Pump price list Rexroth Hydraulic Pump problems Rexroth Hydraulic Pump pv7 Rexroth Hydraulic Pump Qatar Rexroth Hydraulic Pump rebuild Rexroth Hydraulic Pump rebuild kit Rexroth Hydraulic Pump relief valve Rexroth Hydraulic Pump repair Rexroth Hydraulic Pump repair manual Rexroth Hydraulic Pump rotation direction Rexroth Hydraulic Pump schematic Rexroth Hydraulic Pump seal kit Rexroth Hydraulic Pump service center Rexroth Hydraulic Pump service manual Rexroth Hydraulic Pump Singapore Rexroth Hydraulic Pump spare parts Rexroth Hydraulic Pump spares Rexroth Hydraulic Pump specifications Rexroth Hydraulic Pump suppliers Rexroth Hydraulic Pump swash plate Rexroth Hydraulic Pump turkey Rexroth Hydraulic Pump working principle Rexroth Hydraulic Pump s Edmonton Rexroth Hydraulic tandem Pump Rexroth Hydraulic valve parts Rexroth Hydraulic valve price Rexroth Hydraulic vane Pump Rexroth Hydraulic wheel motor Rexroth sigma Hydraulic gear Pump Rexroth variable displacement Hydraulic Pump types of Rexroth Hydraulic Pump uchida Rexroth Hydraulic Pump used Rexroth Hydraulic Pump for sale
To that end, GCC, industry experts in the disciplines of hydraulics, pneumatics, automation, fluid conveyance, integrated systems and service and repair, have put together these instructional videos surrounding some key functions of the A11VLO.
In the first, you’ll find necessary equipment for adjusting the load-sense pumps on the A11VLO, then find a quick, five-step walkthrough of exactly how the process is completed from start to finish.
To learn more about the Bosch Rexroth A11VLO, including data sheets, instructional manuals, information about spare parts and repair, and ordering instructions, you can head over to Bosch Rexroth’s product page here.
Electrical Motors & Wiring • Rexroth Hydraulic Pumps • Adjusting the Pump • Adjusting Flow & Pressure • Adjusting the Control Valve • Troubleshooting Guide • Formulas & Data • Pump Specifications •
This section of the installation manual deals with the set up and adjustment proce-dure for both the Rexroth A11 pump and Danfoss valve, and it gives a generaldescription on the principle of operation of the pump and control valves and isintended to give the Mechanic a better understanding of the importance of the vari-ous adjustments and their effect on the system. A trouble shooting guide is alsoincluded at the end of this manual.
The model of pump, control valve and electric motors may vary depending on theboom system, however, their installation and adjustment procedures remain muchthe same. Following the steps in the order as listed in the manual will save youtime and possible rework.
1) Install the power pack so that the warm air blown out by the motors will not enter the motors again. Theminimum distance between the wall and the inlet should be approximately a quarter of the inlet openingdiameter.2) The electrical wiring of the power pack must be undertaken only by a qualified electrician. Both electricmotors used on the hydraulic pump and cooling fan should be wired in a three phase delta configuration toprovide optimum power unless stated otherwise.3) Make sure to use the correct cable specifications, based on the rated current stamped on the name plate.In high altitude applications the motor may be derated.4) Before energizing the motors make certain the grounding complies with the recommended standards.Also ensure the hydraulic tank is full and the pump has been cleared of all air locks.5) The electrician must ensure the direction of rotation of the motors are correct. If the direction of rotationis reversed the hydraulic pump will be seriously damaged in a very short period of time. Jog the motor toverify the direction of rotation.6) The motors must start up and run smoothly in the correct direction. In case this does not occur, turn itoff immediately and check the connections before re-starting.7) Run the motor and check the current at the rated full load*. Compare the power generated hydraulicallyto that dissipated in the electric motor and then check it against the maximum current rating stamped onthe name plate of the electric motor. The equation to determine the power available in the hydraulic systemis as follows: HORSE POWER = [FLOW (GPM) x PRESSURE (PSI)] / [1714 x efficiency]And the power consumed by the electric motor is: HORSE POWER = 1.73 x LINE VOLTAGE x LINE CURRENT x COS Ø ÷ 746Take cos Ø to be 0.8 and pump efficiency at 93%
* Rated full load : This condition is achieved when the hydraulic pump is delivering the full flow at themaximum system pressure. Use a flow meter on the breaker circuit to perform this test.
This type of pump is capable of delivering both the required oil flow and pressure depending on the sys-tems demand. The pump will de-stroke and draw very little power from the electric motor when none ofthe hydraulic actuators are in use; this type of pump is commonly referred to as a variable displacementhydraulic pump. Used with a control valve having load sensing features utilizes the load sensing capabili-ties of this pump.
Load SensingThe load sensing pump is commonly used in the implement and steering systems of mobile equipment. Itis also exclusively used in all stationary boom systems. The pump can be set to run at a pre-set standbypressure. The pump will, on demand, supply the required pressure.
Testing and Adjusting Procedure.There are four external adjusting screws provided to control the operating flow and pressure of the pump.Maximum Flow - mechanical stop.Minimum Flow - mechanical stop.Maximum Pressure - hydraulic spool.Standby Pressure - hydraulic spool.
Maximum FlowThis controls the maximum flow the pump will deliver. It is a mechanical stop which limits the maximumangle the swash plate is permitted to incline. The screw is used during initial set up of the pump to adjustthe maximum flow at a given pressure.
Minimum Flow (Do Not Adjust)This control the minimum angle the swash plate is permitted to incline. This adjustment is factory set andshould only be readjusted by qualified personnel.
Standby Pressure (Load Sensing) ValveThis adjustment controls the pump standby pressure. A piston and cylinder arrangement within the pumpuses the pressure drop from this valve to de-stroke the swash plate against a spring applied force. A typicalsetting for this would be 450 psi. The pump will then de-stroke and draw very little power from the drivemotor. A load sense signal amplifier may be used on the load sensing line to ensure a strong signal. Thisgreatly reduces the pressure drop in the system when there is a sudden demand for oil flow.
BLEEDING THE HYDRAULIC PUMPFill the hydraulic tank with the recommended oil. Slacken the case drain line at the pump and release anyair that may be trapped. The head of oil in the hydraulic tank will help to push the air through. Once aclean flow of oil passes through the case drain port of the pump, tighten the hose and wipe up any oil thathas spilled.
TOOLS REQUIREDPressure Gauge (1000453) - Supplied in Tool kitHydraulic Flow Meter with Pressure Gauge- Not suppliedHexagon keys (3 - 8 mm)- Not suppliedCombination Wrenches (8 to 28 mm)- Not suppliedMain Relief Adjustment Tool (V9000-10, PVG 120/32 Only)- Not supplied
The hydraulic pump has three adjustments which must be checked and set to the required specification ascalled for in breaker service manual. The system standby pressure must be also set to 450 PSI.At this stage it is assumed that all hydraulic lines have been connected as illustrated in the installationmanual for the boom system, the hydraulic tank has been filled with the recommended oil, the pump bledof all air locks and the wiring to the entire electrical system is completed.
ADJUSTING THE PUMP STANDBY PRESSURE1) Connect the 1000453 pressure gauge to the Danfoss control valve main pressure port; (P) on a PVG 32valve and (MA) on a PVG 120/32 (See Figure 3).2) Start the hydraulic pump and observe the reading on the gauge. The pressure should be adjusted to 450PSI.3) The adjustment for the standby pressure is done through the compensator valve which is mounted on thehydraulic pump. Remove the cap (if fitted), loosen the lock nut and turn the adjustment screw until thestandby pressure is 450 psi at the main pressure port on the Danfoss valve.4) Turning the screw clockwise increases pressure while turning counter-clockwise decreases the pressure.5) Hold the adjustment screw in place and tighten the locknut.6) Check standby pressure gauge again to verify the reading.
Note:The main relief pressure on the Danfoss valve must be set at this point. Refer to page 8. The pump pres-sure adjustment setting determines the maximum pressure the pump can reach. Therefore this setting mustbe higher than 450psi before the standby pressure can be adjusted.
1) Connect the flow meter to the two hydraulic lines of the breaker. Make sure the pressure line is connect-ed to the inlet port and the return to the outlet port of the flow meter. Wrong connections may damage theflow meter!2) With the pump operating activate the breaker fire button.3) Slowly close the restrictor valve on the flow meter. At a certain point the flow rate will drop off veryrapidly. Take the flow and pressure readings just prior to this.4) If the figures for the flow rate and /or pressure are not met as set out in the breaker service manual pro-ceed to adjust as follows:
SYSTEM MAXIMUM PRESSURE ADJUSTMENT (Unloading)The adjustment for this is on the pressure compensator mounted on the hydraulic pump. The pressure willincrease when the screw is turned in and decrease when turned out. Adjust the pressure as set out in theboom or vehicle service manual. On completion, lock the adjusting screw and replace the protective cover.
PUMP FLOW ADJUSTMENTThe rate of discharge from the pump is controlled by the angle the swash plate is permitted to incline. Thismaximum angle is limited by the length of the adjusting screw. Turning the screw out, increases the flowrate. Turning it in, reduces the flow. Due to the opposing spring forces of the rotary group the swash platewill not follow the adjustment screw when the pump is not rotating. Therefore, the adjustment must bedone with the pump delivering close to the maximum flow, in a no load situation. To adjust, remove theprotective cap, loosen the lock nut and turn the hex screw until the pump is delivering the correct flow atthe specified pressure. See page 13 for adjustment per revolution of stroke limiter.
METHOD ‘B’: SETTING THE PUMP UNLOADING WITHOUT A FLOW METERIn the event a flow meter is not available the pump unloading pressure can be set using the 1000453Pressure Gauge. The pump flow set at the factory is approximate and will generally function withinacceptable limits.1) Connect the Pressure Gauge (p/n 1000453) to the pressure port (“P” on PVG32 and “MA” onPVG120/32).2) Pull the breaker fire lever to fully open position.3) Note the pressure reading on the Pressure Gauge.4) Adjust the pump unloading pressure (max press) as specified in the hydraulic schematic.see System Maximum Pressure Adjustment, above.
The Danfoss Control valve is built up of individual sections and each section has four adjustments. Two ofthese control load sensing pressure to their respective ports, while the other two control the flow rate. Theinstallation manual for the boom system sets out the required pressure for each circuit. The flow rate gov-erns the speed at which the various hydraulic cylinders extend and retract and is generally set to suit theoperator and the application for which the boom system is used. Flow & Pressure adjustments are coveredon page 9. All adjustments are done with the hydraulic pump in operation and the respective control leveractuated.
ADJUSTMENT OF THE MAIN RELIEF VALVE (Figure 3 & 4 )The main relief valve is located on the main section of the Danfoss control valve and must be set to 200PSI higher than the pump unloading pressure.
1) Connect the flow meter as described in page 7. Note: If no flow meter is available connect the 1000453pressure gauge to the main pressure port, pull the breaker fire lever back on the control valveand omit step 3.2) Turn in the main relief valve in three full turns.3) Fully close the flow restrictor valve on the flow meter.4) Adjust the maximum pump pressure to 300 PSI greater than specified in the hydraulic schematic. (refer to page 7 for pressure adjustment ).5) With the breaker circuit activated, back off the main relief valve until the circuit pressure drops to200 PSI higher than the specified pump unloading pressure.6) Return to page 7 and adjust hydraulic oil flow and pressure to the breaker circuit.
PORT PRESSURE ADJUSTMENT (Fig. 5).1) Connect the 1000453 pressure gauge to the circuit pressure port (stamped ‘LS’) as shown.2) Pry out the rubber plugs over the adjusting screws.3) Move the hydraulic cylinder in the circuit being adjusted to its full stroke.4) Hold the valve open and make the adjustment to the circuit using a 6 mm Allan wrench (8mm onPVG120/32 Valves). Turning the screw in increases this pressure while turning it out will reduce circuitpressure.5) Replace the rubber plug over the adjusting screw.6) Repeat the above procedure for all of the other hydraulic circuits with the exception of the breaker.
ADJUSTMENT OF THE BOOM DOWN PRESSURE CIRCUIT ON THE TT AND SX SERIES BOOMSThe SX and TT series booms require a special procedure to adjust the down pressure of the boom"s hoistcylinders.Fig (1) shows the pressure reducing valve and Anti blank fire switch. Fig (2) shows the pressure reliefvalve.
ADJUSTMENT PROCEDURE1) Start by loosening the lock nut and fully turning in the adjustment on the pressure Relief valve.2) Loosen the lock nut and fully decrease the pressure setting of the pressure reducing valve to a minimumsetting.3) Install a 1000 psi pressure gauge on the pressure Relief valve as shown in Fig(1)4) Start the pump and lower the boom using the hoist down circuit. Adjust the pressure reducing valve to325 psi with the use of the gauge while the boom down lever on the Danfoss valve is activated.5) Disconnect the Hersman plug. Using an electrical Multi Meter across pin 1 & 3 and adjust the AntiBlank Fire switch to just close at this pressure of 325 PSI. Replace the Hershman plug.6) Increase the setting of the pressure reducing valve to 600psi.7) Adjust the pressure relief valve on the boom down circuit so that the gauge on the pressure reducingvalve reads 475 PSI. Lock the adjustment.8) Re adjust the pressure reducing valve so that the gauge reads 350PSI and lock the adjustment.
SPEED ADJUSTMENT (FLOW) ( Fig 5A )1) Loosen the lock nut on the adjusting screw.2) Move the respective lever to its fully open position and turn the adjusting screw until the desired speedis obtained.3) Hold adjustment screw in place and lock it using the lock nut.4) Repeat the above procedure for all of the other circuits.5) The adjustment for the breaker circuit should be set to the fully open position to permit maximum flowwhen the circuit is activated.
Pump slows down or Motor not wired in a three phase delta con- Re-wire in Delta configuration.stalls on load. figuration. Check power source. Low voltage supply. Adjust unloading pressure. High unloading pressure.
Wrong adjustment on SWASH plate. Adjust pump.Flow rate of pump Wrong grade of oil. Re-fill with recommended oil.below specification. Worn pump. Replace pump. Pump speed too low. Check motor and wiring. Sticky spools on Compensator valve. Remove and clean spools.
Slow hammer fire. Low flow rate on hammer circuit. Adjust flow on pump. Contaminated hydraulic system. Clean affected components.
Pump Seal Kits: 71cc - 1004192, 100cc - 1005010, 140cc - 1005342Adjustment /1 Rev of Stroke Limiter: 71cc = .287ci , 100cc = .375ci , 140cc = .43ci