rexroth hydraulic pump seal kit free sample

Around 98 percent of the spare parts kits consist of seal kits. The seals used at Rexroth are subject to strict criteria in terms of material, manufacturer and quality, as these are decisive in hydraulics for the tightness, performance and service life of the systems. This begins with the correct dimensions of a seal for a given installation space. Without appropriate design tools, it becomes very difficult for the user to find a working solution. Rexroth-specific R-ring seals in particular - in comparison to the somewhat simpler O-rings - cannot be designed with externally available online tools.

Errors can also easily occur in the material. For example, the common designation NBR says little about the exact composition and thus about the mechanical, thermal and chemical resistance. Of the numerous seal manufacturers on the market, hundreds of so-called compounds are available, the differences between which can only be determined by extensive testing and whose service life in the hydraulic system varies enormously.

The seal kits therefore contain the original seals of Rexroth hydraulic components, i.e. also the correct materials in original equipment quality, optimally matched to the installation situation.

The complete seal kits from Bosch Rexroth always contain all necessary sealing rings for maintenance. A uniform packaging system with standardized cartons protects the spare parts from negative environmental influences and simplifies storage by the user. The seals are individually welded onto seal kit supports and protected against oxygen, light and UV radiation. This prevents deformation, hardening, ageing, corrosion and weathering, especially in the case of sensitive high-performance seals, even during long periods of storage. This allows the user to exploit the full service life of the seals in the system.

ETS is committed to providing our customers with the most reliable and genuine Bosch Rexroth, Parker, Calzoni, Vickers (Eaton), Atos & Hydac pump and motor units, valves and parts possible.

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.

We recognize and understand the vital role of rexroth cylinder seal kits in their application. With purposes including securely fastening components within systems, and contaminants prevention such as gases and liquids from navigating through enclosed and sealed areas. That is why we offer wholesale rexroth cylinder seal kits in different variations and diversities to ensure the integrity and efficiency of systems they will be applied to will function successfully and optimally. The different seals" types available include static that does not move along with other seals and dynamic seals that move collaboratively.

Depending on the industry and selected purpose, we consider rexroth cylinder seal kits requirements. Requirements are like pressure, that is pressure changes, to ensure they can withstand and do not deform by the sealed fluid, the load and how it can withstand deflection, dynamics such as the alignment and vibration, and temperature covering the environmental conditions and the heating arising from the friction of the seal operation and fluid movement.

The seals are either bolts, nuts, or washers. Seal bots are commonly used because of their benefits in being reusable, preventing fluids and contaminants from escaping even under high pressure. Nuts are essential on temperature withstanding and compatibility with screws, studs, and bolts, in addition to, easy installation. Moreover, washers can withstand high pressures and are compatible with other seals.

Check that the pump shaft is rotating. Even though coupling guards and C-face mounts can make this difficult to confirm, it is important to establish if your pump shaft is rotating. If it isn’t, this could be an indication of a more severe issue, and this should be investigated immediately.

Check the oil level. This one tends to be the more obvious check, as it is often one of the only factors inspected before the pump is changed. The oil level should be three inches above the pump suction. Otherwise, a vortex can form in the reservoir, allowing air into the pump.

What does the pump sound like when it is operating normally? Vane pumps generally are quieter than piston and gear pumps. If the pump has a high-pitched whining sound, it most likely is cavitating. If it has a knocking sound, like marbles rattling around, then aeration is the likely cause.

Cavitation is the formation and collapse of air cavities in the liquid. When the pump cannot get the total volume of oil it needs, cavitation occurs. Hydraulic oil contains approximately nine percent dissolved air. When the pump does not receive adequate oil volume at its suction port, high vacuum pressure occurs.

This dissolved air is pulled out of the oil on the suction side and then collapses or implodes on the pressure side. The implosions produce a very steady, high-pitched sound. As the air bubbles collapse, the inside of the pump is damaged.

While cavitation is a devastating development, with proper preventative maintenance practices and a quality monitoring system, early detection and deterrence remain attainable goals. UE System’s UltraTrak 850S CD pump cavitation sensor is a Smart Analog Sensor designed and optimized to detect cavitation on pumps earlier by measuring the ultrasound produced as cavitation starts to develop early-onset bubbles in the pump. By continuously monitoring the impact caused by cavitation, the system provides a simple, single value to trend and alert when cavitation is occurring.

The oil viscosity is too high. Low oil temperature increases the oil viscosity, making it harder for the oil to reach the pump. Most hydraulic systems should not be started with the oil any colder than 40°F and should not be put under load until the oil is at least 70°F.

Many reservoirs do not have heaters, particularly in the South. Even when heaters are available, they are often disconnected. While the damage may not be immediate, if a pump is continually started up when the oil is too cold, the pump will fail prematurely.

The suction filter or strainer is contaminated. A strainer is typically 74 or 149 microns in size and is used to keep “large” particles out of the pump. The strainer may be located inside or outside the reservoir. Strainers located inside the reservoir are out of sight and out of mind. Many times, maintenance personnel are not even aware that there is a strainer in the reservoir.

The suction strainer should be removed from the line or reservoir and cleaned a minimum of once a year. Years ago, a plant sought out help to troubleshoot a system that had already had five pumps changed within a single week. Upon closer inspection, it was discovered that the breather cap was missing, allowing dirty air to flow directly into the reservoir.

A check of the hydraulic schematic showed a strainer in the suction line inside the tank. When the strainer was removed, a shop rag was found wrapped around the screen mesh. Apparently, someone had used the rag to plug the breather cap opening, and it had then fallen into the tank. Contamination can come from a variety of different sources, so it pays to be vigilant and responsible with our practices and reliability measures.

The electric motor is driving the hydraulic pump at a speed that is higher than the pump’s rating. All pumps have a recommended maximum drive speed. If the speed is too high, a higher volume of oil will be needed at the suction port.

Due to the size of the suction port, adequate oil cannot fill the suction cavity in the pump, resulting in cavitation. Although this rarely happens, some pumps are rated at a maximum drive speed of 1,200 revolutions per minute (RPM), while others have a maximum speed of 3,600 RPM. The drive speed should be checked any time a pump is replaced with a different brand or model.

Every one of these devastating causes of cavitation threatens to cause major, irreversible damage to your equipment. Therefore, it’s not only critical to have proper, proactive practices in place, but also a monitoring system that can continuously protect your valuable assets, such as UE System’s UltraTrak 850S CD pump cavitation senor. These sensors regularly monitor the health of your pumps and alert you immediately if cavitation symptoms are present, allowing you to take corrective action before it’s too late.

Aeration is sometimes known as pseudo cavitation because air is entering the pump suction cavity. However, the causes of aeration are entirely different than that of cavitation. While cavitation pulls air out of the oil, aeration is the result of outside air entering the pump’s suction line.

Several factors can cause aeration, including an air leak in the suction line. This could be in the form of a loose connection, a cracked line, or an improper fitting seal. One method of finding the leak is to squirt oil around the suction line fittings. The fluid will be momentarily drawn into the suction line, and the knocking sound inside the pump will stop for a short period of time once the airflow path is found.

A bad shaft seal can also cause aeration if the system is supplied by one or more fixed displacement pumps. Oil that bypasses inside a fixed displacement pump is ported back to the suction port. If the shaft seal is worn or damaged, air can flow through the seal and into the pump’s suction cavity.

As mentioned previously, if the oil level is too low, oil can enter the suction line and flow into the pump. Therefore, always check the oil level with all cylinders in the retracted position.

If a new pump is installed and pressure will not build, the shaft may be rotating in the wrong direction. Some gear pumps can be rotated in either direction, but most have an arrow on the housing indicating the direction of rotation, as depicted in Figure 2.

Pump rotation should always be viewed from the shaft end. If the pump is rotated in the wrong direction, adequate fluid will not fill the suction port due to the pump’s internal design.

A fixed displacement pump delivers a constant volume of oil for a given shaft speed. A relief valve must be included downstream of the pump to limit the maximum pressure in the system.

After the visual and sound checks are made, the next step is to determine whether you have a volume or pressure problem. If the pressure will not build to the desired level, isolate the pump and relief valve from the system. This can be done by closing a valve, plugging the line downstream, or blocking the relief valve. If the pressure builds when this is done, there is a component downstream of the isolation point that is bypassing. If the pressure does not build up, the pump or relief valve is bad.

If the system is operating at a slower speed, a volume problem exists. Pumps wear over time, which results in less oil being delivered. While a flow meter can be installed in the pump’s outlet line, this is not always practical, as the proper fittings and adapters may not be available. To determine if the pump is badly worn and bypassing, first check the current to the electric motor. If possible, this test should be made when the pump is new to establish a reference. Electric motor horsepower is relative to the hydraulic horsepower required by the system.

For example, if a 50-GPM pump is used and the maximum pressure is 1,500 psi, a 50-hp motor will be required. If the pump is delivering less oil than when it was new, the current to drive the pump will drop. A 230-volt, 50-hp motor has an average full load rating of 130 amps. If the amperage is considerably lower, the pump is most likely bypassing and should be changed.

Figure 4.To isolate a fixed displacement pump and relief valve from the system, close a valve or plug the line downstream (left). If pressure builds, a component downstream of the isolation point is bypassing (right).

The most common type of variable displacement pump is the pressure-compensating design. The compensator setting limits the maximum pressure at the pump’s outlet port. The pump should be isolated as described for the fixed displacement pump.

If pressure does not build up, the relief valve or pump compensator may be bad. Prior to checking either component, perform the necessary lockout procedures and verify that the pressure at the outlet port is zero psi. The relief valve and compensator can then be taken apart and checked for contamination, wear, and broken springs.

Install a flow meter in the case drain line and check the flow rate. Most variable displacement pumps bypass one to three percent of the maximum pump volume through the case drain line. If the flow rate reaches 10 percent, the pump should be changed. Permanently installing a flow meter in the case drain line is an excellent reliability and troubleshooting tool.

Ensure the compensator is 200 psi above the maximum load pressure. If set too low, the compensator spool will shift and start reducing the pump volume when the system is calling for maximum volume.

Performing these recommended tests should help you make good decisions about the condition of your pumps or the cause of pump failures. If you change a pump, have a reason for changing it. Don’t just do it because you have a spare one in stock.

Conduct a reliability assessment on each of your hydraulic systems so when an issue occurs, you will have current pressure and temperature readings to consult.

Al Smiley is the president of GPM Hydraulic Consulting Inc., located in Monroe, Georgia. Since 1994, GPM has provided hydraulic training, consulting and reliability assessments to companies in t...

Send us your pump or motor for a free evaluation. We will carefully clean and inspect it, checking precision fits for tolerance and listing necessary replacement parts.

Generally, overhauling a hydraulic pump is a four step process - you disassemble it, identify damaged components, replace or re-work them and then re-assemble the pump. Practical, functional and dull.

I got it last week, and it almost seemed like it had been sent to me on purpose by someone who had read my article about "small big symptoms" I posted a couple of weeks earlier, because it arrived with the usual "the transmission is running perfectly fine, and the only problem is the leaking shaft seal, but since we"re overhauling the slew bearings, we might as well take care of the leak".

I double-checked this with the owner, and he confirmed that as far as the speed and force went - the performance of the closed loop transmission was flawless. So, I took a lever from the tool stand and tried to wiggle the shaft - and, sure thing, it moved! The client was very surprised to see the shaft end shift about so much. I guess it"s not just the shaft seal now, is it?

What is this? Marvelous! Stunning! Did someone forget a wedding ring inside? Of course not, but still - this is another example of how hydraulic pumps can create beautiful things like flowers and tiny castles!

The cyclic abrasive action of the hard particles between the retainer plate and the piston slippers reduced their height significantly, and caused the outer burr to roll into a perfect ring which separated from one of the slippers and fell down as I pulled the rotary group apart. Note how perfectly round its shape is! And how about this wedding ring with a jewel? Isn"t it a beautiful sight to behold? Definitely something you don"t find in broken pumps every day!

Another detail here - look at the shaft spline behind the bearing - you can clearly see that it"s damaged, but it wasn"t damaged this time (no respective damage to the swash-plate or anything else) - so this tells me that this pump had definitely suffered a major failure at least once before. It also tells me that the shop that repaired the pump last time did a poor job here - they should have at least deburred the damaged spline.

This is a very important lesson here, by the way. All this heavy wear combined with the swash-plate bearing that was almost at the breaking point had absolutely no detectable effect on the performance of the pump.

Talking about it is one thing, seeing is completely different. Seeing is believing! I suggest you bookmark this page to be able to show it to hydraulic equipment owners as an illustration of how a perfectly performing pump can be on the verge of catastrophic failure.

Anything else interesting? How about this eccentric valve plate pin - it"s important to know that this pin allows you to alter the timing angle of the valve plate - compare this angle with the more advanced one. Nice design, mr. Rexroth!

Now the charge pump can tell a very interesting story of its own, that is - if you let it, because if you look at it and see but a worn out charge pump - you will be missing out on so much interesting information!

What can we learn here? First - the fact that the outer gear ended up in the incorrect position, plus the wear marks present on both sides of the teeth tell me that this part had worked in the correct position first, and then was re-mounted incorrectly. Second - this is a definite proof that the correct mounting position exists for a reason. When the gear is inserted "the other way around" it gets jammed between the pump housing and the metal plate. Look at the opposite side of the plate - you can see that in the spot where the most friction was happening the plate heated up so badly that the the o"ring seal behind it literally charred. Well, at least we know now what happens when this gear is mounted in incorrect position.

Another lesson here - even though the incorrect position of the external gear did cause damage to the charge pump - the unit ran problem free for at least 5000 hours (I know for a fact that the pump clocked about 5000 hours after the machine had been imported). What"s the secret here? - It"s the presence of the charge pressure filter between the charge pump and the loop!

Two more lessons for you: a closed loop transmission change pump can deliver adequate charge flow even when it"s worn out, and lesson two - charge pressure filtration definitely saves the main pump when a charge pressure pump creates contamination due to wear. I never skip charge pressure filtration when I design a closed loop system! Never!

Wear in the shaft bearing will cause case oil contamination and consecutive excessive wear in the pump components without any symptom of degraded performance.

If you mount the external gear of a A4VG charge pump "the other way around" it will damage itself, the plate and the housing, but, surprisingly, the pump will work for a long time if the pump is equipped with a charge pressure filter.

CJ Plant are one of the UK’s leading hydraulic repair specialists who specialise in the repair of all major brands of machinery/ OEMs. We are a well-established company with years of experience in all aspects of hydraulic repairs to hydraulic pumps, motors, final drives, swing reduction units, control valve blocks etc. We believe we offer one of the most complete and cost-effective services in the country to deal with all your maintenance and repair needs in one place and place us far ahead of our competitors. Savings of up to 50% compared to main dealer prices are not uncommon for our customers. We deal daily with customers not only from the UK but from all over the world and offer a quick and professional solution which can be broken down into nine key points:

Once we are sure the unit and all its components have been inspected as fully as possible, all damaged and worn parts are replaced. All O-rings, seals and bearings are also replaced and the unit is completely rebuilt.

To ensure our customers receive the optimum performance from their equipment on its return we have invested in custom built hydraulic testing equipment unique to our facility to be certain we deliver the best results. This means our hydraulic testing can be performed at various speeds and pressures to simulate the actual working conditions the part will be subjected to when working in line with OEM standards. All fluids used are filtered to ensure purity and prevent any contamination at the last stage.

At CJ Plant we pride ourselves not just on the speed and quality of our work but on the standard of service we provide to all customers, regardless of location, size of order or complexity of their request. Our friendly, professional staff make it their business to help satisfy all our customers’ needs and requirements and would be happy to answer any enquiries. Please call and speak to one of our Hydraulic Repair Services today.