sauer danfoss hydraulic pump adjustment price

With the Danfoss PLUS+1® GUIDE programming environment and our Series 45 open circuit axial piston pumps, you can develop customized controls. This, faster than ever while reducing the cost and development time normally associated with programming. Ultimately resulting in faster time to market. PLUS+1 is the recommended way to higher performance, longer service life and lower costs. Our pumps are also designed to work seamlessly with PVG valves. Which provide electronic control, load-sensing and a flexible, modular design — assuring optimum performance.

The new K2 frame – the best combination of package size and weight on the market. With an optimized package, the K2 frame responds to customer needs. This, by significantly reducing pump weight and package size, while improving performance with increased rated pressure and higher-rated speed capabilities. The result is the best combination of package size and weight on the market.

Best in the industry for weight, package and serviceability. The lower minimum system pressures allowed by the fan drive control results in slower minimum fan speeds. This improves fan drive system efficiency and offers benefits for low cooling requirement conditions. An optimized design makes Danfoss fan drive control the best in the industry for weight, package and serviceability.

ETL can reduce fuel consumption without any loss in productivity. The gains of running the engine at the lowest brake specific fuel consumption (BSFC) is offset by the increased flow of a larger pump. This can operate without the risk of stalling an engine — something traditional torque controls cannot match.

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...

Every once in a while I have to confront an opinion that Multi-Function valves from Danfoss series 90 closed-loop pumps are "all the same". There is a big chance that this myth is a local Portuguese phenomenon that emerged due to the lack of technical curiosity on the part of certain dealers, who traditionally give more attention to the commercial side than to the technical details of the product they sell and promote. In this article, I will explain, yet again, the function and principle of operation of these valves, as well as the difference in the dynamic behavior between their types.

The pressure limiter function reduces the pump"s displacement when the high-pressure setting is reached. The function is performed by the tiny poppet, pre-loaded by the adjustable spring (cutaway view). When the system pressure lifts it from its seat, the oil flows directly into the servo-cylinder opposite to the one that is tilting the swashplate, which reduces the effective delta-P of the servo cylinder and de-strokes the pump.

The reason I am putting only the types 1, 2, and 5 here is simple - these three are the only ones I"ve seen pass through our shop. According to the Danfoss parts list for series 90 there are more.

The multi-function valves for series 90 have a simple and compact design, and as a rule last as long as the pump itself. I have seen them shatter and cause a catastrophic pump failure, but it"s not an everyday malfunction. If I could change one thing about these valves - it would definitely be the hexagonal adjusters! I would make them taller and therefore easier to clamp a standard wrench on.

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 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.

Our team of trained engineers and technicians have been remanufacturing Sauer-Danfoss® (Sauer-Sundstrand) pumps and motors for over 30 years. We specialize in the remanufacturing of nearly every Series in the Sauer-Danfoss/Sundstrand family. Many units are in stock and available for immediate delivery. Don"t see what you"re looking for? Our inventory is constantly changing, give us a call - we still might have it or can possibly source it from our other companies.