what is a case drain on a hydraulic pump in stock

Often in hydraulic systems, hydraulic motors and pumps run case drain hoses.  The reason for this is to drain excess internal oil leakage from the motor.  This is certainly critical in a piston motor and pump as the pistons have some internal leakage as they are actually just metal on metal.  If no case drain hose is installed then the result will be, at the least, a blown shaft seal, and at worst, a split or damaged housing.

With gear pumps the leakage drains back into the suction hose internally, so no case drain is required.  With gear motors and geroller/geroter motors, the oil can drain into the outlet port, however, that means that the oil pressure in the outlet port must not exceed the pressure rating of the seal.  If it does, then a case drain needs to be installed.  This will then usually mean you can run motors in series without damaging the motor.

If you require assistance with your hydraulic system, motors, pumps, hoses, seals, case drain, oil, lubricants or anything else for that matter, please give us a call on (03) 5382 0574 or call in and see us at Horsham Hydraulics, 84 GolfCourse

This article is based on a basic circuit with single hydraulic internal gear motor. More complex circuits with multiple motors can have different solutions. Collaborate with your motor supplier for the best results for your particular design.

Background: Hydraulic motors have a volumetric efficiency of 90-98%. That means 2 - 10% of the flow entering the motor leaks internally into the case. This is intentional and vital for internal lubrication and clearance between mating pieces.If not allowed to escape, that leakage can build pressure inside the pump case, causing seal leaks or worse, cracks in the cast iron case. The main purpose of a case drain is to allow the internal leakage to escape, but there are other benefits too.

Alternatives: The motor below has a clever solution making the case drain "optional". Two smaller plugs on the rear of this internal gear motor are for check valves.

In the absence of a case drain line, these check valves allow fluid in the case to enter the low-pressure fluid stream. This allows leaked fluid and contamination to exit the motor via the drain line. That might explain why you have seen some hydraulic motors without case drains. However, in a reversing application, that heat and contamination returns to the motor when the direction is reversed.

With a case drain vented to tank, heat and contamination are sent to the reservoir, extending motor life. Even if the case drain port is located on the bottom of the motor, the case will remain filled if the reservoir is above the motor.

Sizing case drain lines.Typically, hydraulic motors and pumps have hoses that run to a case drain in order to drain excess internal oil from the motor. Having a case drain usually requires running motors in series to avoid damage. If the case drain line is undersized on a hydraulic pump (piston),it can cause the pressure in the case to be too high. As the pump’s life depreciates, its volumetric efficiency will decrease, which in turn will increase leakage from the case drain line. If there is extreme case pressure, it can cause the piston shoe to lift off of the swash plate. This will cause damage that will force the pump to stop working. Go by the case drain port size or up-size it. It is important to make sure the case pressure is below the max rating, which, if necessary, can be adjusted at the case drain port size, or increase the size of the port. Case pressure can also become too high at:

Alleviate pump failure by mitigating caveated or aerated components.If air is allowed to enter the system, the aeration will produce erosive damage when passing through the pump. In addition, cavitation can cause insufficient pump inlet, which can damage the pump. Either of these conditions can be very destructive.

Aeration is caused by air entering the pump inlet and mixing with the fluid. Low pump pressure at the inlet will cause air bubbles to expand and, as the aerated fluid reaches the pressure side of the pump, the bubbles will disintegrate and implode which causes internal erosion of the system.

Similar to aeration, extreme vacuum in a component will cause cavitation, which allows vapor bubbles to form in the fluid, ultimately damaging the pump.

Either of these conditions will cause pump noise to go up. If the system is allowed to continue to operate the pump will eventually fail. To safeguard against this problem in the design phase any source of air must be contained and the potential of vacuum at the inlet must be alleviated.

If the proper size of the lines is not selected to handle a higher flow rate, unwanted heat will occur causing damage to motors or other hydraulic system components. When designing a hydraulic system valvesmust be selected and sized correctly, or flow will be restricted which can cause it to unseat. In addition, the filter must be sized correctly, or the bypass valve may open causing some of the fluid to be unfiltered or cause a flow surge that could collapse the element.

The control of pressure in a system is paramount in the design. Within hydraulic system components and their functions, pressure control valves are essential in preventing leaks or bursting of pipes, hoses or tubing. This is largely dependent on the proper selection of pressure control valves, which may include:

White House Products Ltd., one of the leading hydraulic gear pump suppliers, is familiar with the importance of monitoring case drain flow and offers some valuable tips for monitoring your hydraulic pump, lines, and overall system performance.

Monitoring the case drain flow in hydraulic piston pumps and motors is beneficial to determine the current state of the hydraulic pump and the status of fluid flow rates. This type of monitoring is considered to be preventative/predictive pump maintenance because you can see the conditions slowly start to degrade over time from continuous pump use. Without maintenance, the pump’s performance and pressure load capability will degrade; excessive wear due to particulate contamination is responsible for the vast majority of all hydraulic component failures.

In the past, it was common to just continue to run piston pumps & motors without any monitoring. Once the fluid degraded and the conditions become too poor to continue to operate the system, the pump was either replaced or rebuilt. Plus, the system was flushed. This often led to long downtimes while the work was being done.

Not to mention, the costs to replace/rebuild a pump and flush the hydraulic system are more expensive than case drain monitoring. Case drain monitoring allows the operator and maintenance technicians to determine the current flow rates and evaluate the pump without having to stop operations.

Once the flow rates start to drop below a percentage of the total expected pump output on the case drain monitor, maintenance technicians will know the pump needs to be serviced, by either rebuilding it or replacing it. Monitoring can also help prevent having to flush the system each time the pump is serviced.

If your case drain flow meter is properly sized, it should be easy to take readings and there should be minimal back pressure on the case of the pump or motor. When selecting a device, determine your application’s flow rate (one method is to calculate 10% of the pump’s total output and picking the closest flow range). When results don’t correspond to a specified range, rounding to the nearest one is helpful.

A case drain monitor can reveal abrupt changes in drain flow and can provide years of service. During installation, check manufacturers’ guidelines for the pump or motor to be certain that the maximum allowable case drain pressure, exceeds the back pressure exerted by the flow monitor. While monitoring pump performance, you can log the baseline flow from the pump case to reservoir and any changes at set time intervals. You’ll instantly know when maintenance or hydraulic pump replacement is required.

Order a hydraulic motor or complete hydraulic pump system from one of the most trusted hydraulic piston pump suppliers. We offer a full range of high-quality hydraulic components so you can have the most reliable hydraulic system possible. Also, find hydraulic diagnostic equipment including flowmeters and pressure gauges to help maximize the reliability of your hydraulic pump installation. For assistance in choosing the right case drain monitors for your hydraulic systems, do not hesitate to call White House Products, Ltd. at +44 (0) 1475 742500 today!

One way to troubleshoot a final drive that seems weak is to take a look at the rate of flow from the case drain line. In this Shop Talk Blog post, we are going to review the purpose of a case drain line, look at what case drain flow can tell us about a final drive, and then discuss how to estimate the case drain flow. We"ll finish up by looking at how to evaluate the case drain flow to determine if the problem is your final drive.

When a final drive is damaged or badly worn, however, there will be more internal leakage. This excessive leakage will negatively impact the performance of the final drive and can be the cause of a lack of power. If there is too much leakage, it can be detected by monitoring the flow from the case drain line.

If the rate of case drain flow is greater than it should be, then there is a good probability that you have a problem with that final drive. Examples of too much case drain flow would be flow that is greater on the “bad” side than the “good” side, more than what the manufacturer specifies, or more than a very slow rate of flow). If your final drive"s case drain flow is too much, it should be serviced before things get any worse. On the other hand, if the case drain flow is within normal parameters, then the problem is probably not going to be your final drive and you need to keep investigating.

Investing the case drain flow from a final drive or travel motor can help when troubleshooting what seems to be a weak final drive or travel motor. Just keep in mind that it"s important to investigate all the possibilities before deciding the cause is your final drive motor.

is your partner in providing new or remanufactured final drive hydraulic motors from a single mini-excavator to a fleet of heavy equipment. Call today so we can find the right final drive or hydraulic component for you, or check out our online store to.

Clogged case drain filters are responsible for a significant number of failed final drives and hydraulic motors that come into our shop here at Texas Final Drive. In this

You can add to this list other domino-effects that can quickly total for your final drive to the point that it is beyond repair. And all of that can results from failing to change out the case drain filter!

As you follow the line, you’ll encounter the filter itself. The filter looks like an aluminum canister that is about 1 ¼” in diameter and between 3” and 3 ½” long. Remove the filter from the drain lines and be sure to plug the drain lines to avoid losing hydraulic fluid or introducing contamination into the system.

To access the filter element, simply unscrew the hex nut. It contains a tapered If the filter is no longer a bronze color, it needs to be replaced. Otherwise, you should be able to clean it and put it back in.

Clogged case drain filters lead to many of the failures that we see come into the shop for repair or reman. The damage that a clogged case drain filter can cause is unbelievable -- and very expensive. For the sake of your equipment, check to see if your final drive motors have a case drain line and, if they do, check and change it regularly. This If you have any questions, feel free to give us a call.

Getting the most out yourmeans keeping your excavation equipment in maximum working order. Yet when equipment downtime happens partnering with the mostcost efficience and time sensitive manufacturing source is key!provides thebest-in-classresource forreman final drive motors. Check out the latest inventory updates for.

Mid MichiganWhat is a case drain on a vacuum planter? We are converting our Kinze planter to v-sets. I have a dump valve on the tractor already, will that work for the return on the fan. Thanks

You"ll often find case drain filters on skid steer loaders, compact track loaders, and mini-excavators -- especially with brands like Case and Bobcat. How important are those filters? And what happens if they get clogged?

In the context of final drive motors, a case drain line returns any internally leaked hydraulic fluid to the tank on your machine. And before we go any further, keep in mind that

seals on your drive motor start to leak, then grit, sand, and dirt can make their way into your final drive. And if your final drive experiences a catastrophic failure, there is going to be a significant amount of generated contamination that is released. And without a case drain filter, that contamination in your final drive can reach other parts of your hydraulic system. With no filter, a simple drive motor failure can become a very expensive hydraulic system failure.

If your machine has a case drain filter and you don"t replace it often enough, then the hydraulic fluid can"t pass through and pressure builds. And even though the case drain line is designed to be low-pressure, that pressure will get high. And high pressure is always going to look for the weakest point to make its escape.

In most instances, the weakest point in your drive motor will be the seals. The seals will start leaking fluid, and that affects performance and will lead to accelerated wear on key components. Leaking fluid will reduce the amount of lubrication available, which means components will start generating even more contamination.

Failed seals will only relieves the pressure so much. In the worst cases we"ve seen, the cover plate of your motor can split and even fly off at high speed. Obviously, none of this is good.

insideyour drive motor. The pressure can go so high that components get displaced. If you"ve got an axial piston final drive motor, the piston ball and shoes are going to be in tension because of the pressure. As that tension continues to build, the shoes can be pulled off. This will wreak havoc in your drive motor, and results in damage that cannot be repaired.

In a radial piston motor, the high pressure can cause the pistons to lift off the cam and then be hammered back into the cam. And if the pressure builds high enough, the pistons and cams can completely lose contact. The final drive motor then freewheels and you won"t be able to control the movement of your machine.

So how often should you replace case drain filters? Here at Final Drive Parts, we recommend that you replace them whenever you are replacing the other hydraulic filters. Adding this to your maintenance routine can save you thousands of dollars in totaled final drive motors.

Maintaining a proper oil temperature in a hydraulic system is essential for successful operation. High fluid temperatures can damage components and significantly alter the way the system performs, resulting in costly repairs and downtime.

Hot oil increases internal leakage in pumps and motors, causing the machine to operate more slowly. O-rings also harden at higher temperatures, leading to more leaks in the system.

Further, hydraulic fluid temperatures above 180°F (82°C) may damage seal compounds and accelerate oil degradation. Operators should avoid running a hydraulic system at temperatures above 180°F (82°C). Every 18-degree increase in temperature above 140°F cuts the oil life in half. Systems that operate at high temperatures can produce sludge and varnish, which result in damage to the hydraulic system and reduce efficiencies.

Pressure-compensating piston pumps are commonly used in industrial hydraulic systems. Tolerances allow for a small amount of oil to bypass, generating heat that is piped back to the reservoir through the case-drain line. There are many other reasons for heat generation in hydraulic components and systems; the inefficiency of the pump, friction in the pipes, joints, line fittings, and so on, are the major contributors to heat generation. The tolerances inside pumps and valves are generally in the ten-thousandths of an inch. These tolerances permit a small amount of oil to continuously bypass the internal components, causing the fluid temperature to rise.

Flow controls, proportional valves, and servo valves control the oil’s flow rate by causing a pressure loss as oil flows through the valves. This means that higher pressure exists at the valve’s inlet port than at its outlet port. Anytime oil flows from higher pressure to a lower pressure, it generates heat that is absorbed in the oil.

Gear pumps and motors generally do not have a case drain, but they do have internal leakage, which, by design, usually accumulates in a small cavity just before the shaft seal. Air-cooled compact heat exchangers can be used to address the heat in this area.

When a pump or motor is worn or damaged, internal leakage increases, and therefore the flow available to do useful work decreases. This means the hydraulic efficiency decreases and results in additional heat generation. Implementing a case-drain cooler can assist with maintaining a viscosity range at which your machinery operates most efficiently. System checks should be performed regularly to determine the amount of bypassing oil. The pump should be changed when the oil flow reaches 10% of the pump volume.

By introducing cooling into the system, efficiencies increase, resulting in less power consumption. In some cases, high oil temperatures that are reflected back to the drive motor lead to wasted electricity by forcing the drive motor to pull more current to operate the system.

Case-drain coolers are ideal for applications requiring minimal cooling. These coolers offer minimal mounting to reduce installation time, typically with horizontal and vertical options. The cooler mounts behind an existing TEFC motor, using the electric-motor fan airflow. Cooling flow is obtained from the case drain of the hydraulic machine and is then guided to the integrated electrical machine. Pressure losses in the electrical machine can be seen as negligible. The outgoing flow moves by gravity as long as the outlet and inlet ports are of adequate dimensions.

To select the best air oil cooler, provide as much information about the application as possible, including oil heat load in Btu/h or hp, oil flow rate in gpm, maximum inlet oil, and maximum ambient air temperatures during operation.

If the required heat dissipation is unknown, it can be estimated that 20% to 30% of the installed horsepower will be converted into heat load. Heat exchangers can be used to remove the excess heat in a hydraulic system. The implementation of a heat exchanger has many variables that need to be taken into account.

The heat exchanger and reservoir should be sized when a system is initially designed to remove the generated heat. The reservoir allows some of the heat to dissipate through the walls to the atmosphere. The heat exchangers should be sized to remove the balance of the heat. The heat exchanger needs to be maintained to ensure excess heat is removed. If an air-type heat exchanger is used, the cooler fins should be cleaned regularly. A degreaser may be necessary to clean the fins.

To ensure profitable and efficient success in a manufacturing operation, maintaining a proper oil temperature in all hydraulic systems is essential. High hydraulic-fluid temperatures can damage system components and significantly alter the way a hydraulic system performs, resulting in costly repairs and downtime.

The AKG Thermal Systems CD Series is designed to fit in tight spaces and conveniently mounts onto a power unit with limited envelope space. The narrow profile conditions and cools for a wide array of applications.

The AKG tube fin design offers more significant cooling and does not require a protective guard. This cooling setup is compact, low cost, and low flow with minimal heat removal.

When a pump or motor is worn or damaged, internal leakage increases and therefore the flow available to do useful work decreases. This means that the condition of a pump or motor can be determined by measuring the flow from its case-drain line (internal leakage) and expressing it as a percentage of its theoretical flow. However, using case drain flows to determine the condition of a hydrostatic transmission, without a thorough understanding of closed circuits, can lead to incorrect conclusions and the costly change-out of serviceable components.

A hydrostatic transmission usually comprises a variable-displacement pump and a fixed or variable displacement motor, operating together in a closed circuit. In a closed circuit, fluid from the motor outlet flows directly to the pump inlet, without returning to the tank (Fig. 1).

Because the pump and motor leak internally, which allows fluid to escape from the transmission “loop” and drain back to tank, a fixed-displacement pump called a charge pump is used to ensure that the loop remains full of fluid during normal operation.

In practice, the charge pump not only keeps the loop full of fluid; it pressurizes it to between 110 and 360 psi, depending on the transmission manufacturer. A simple charge pressure circuit comprises the charge pump, a relief valve, and two check valves, through which the charge pump can replenish the transmission loop(Fig. 2).Once the loop is charged to the pressure setting of the charge relief valve, flow from the charge pump passes over the relief valve, through the case of the pump or motor or both, and back to tank.

A variation to this charge circuit arrangement is where the transmission is fitted with a purge valve (also called a transmission valve or replenishing valve or flushing valve). Because the fluid in a closed circuit flows directly from the motor outlet to the pump inlet, it means that apart from losses through internal leakage, the same fluid circulates continuously between pump and motor. If the transmission is heavily loaded, the fluid circulating in the transmission loop can overheat. The function of the purge valve is to positively exchange the fluid in the loop with that in the reservoir.

A purge valve is most effective when it is located at the motor, assuming the charge check valves (Fig. 2) are located in the transmission pump, as is the norm. The effect of this is that cool fluid drawn from the reservoir by the charge pump charges the low-pressure side of the loop through the check valve located close to the transmission pump inlet. The volume of hot fluid leaving the motor outlet that is not required to maintain charge pressure in the low pressure side of the loop vents across the purge valve relief into the case of the motor and back to tank—sometimes via the transmission pump case.

This arrangement is important to keep in mind when using case drain flow to determine the condition of a hydrostatic transmission because charge pump flow must be taken into account.Consider an example where charge pump flow is 10 gpm, of which 4 gpm is leaking out of the loop through the motor’s internals (case drain) and 2 gpm is leaking out of the loop through the pump’s internals. The balance of 4 gpm must therefore be going over either the charge or purge relief valve—but still ends up in the pump or motor case, depending on the location of these valves.

In other words, it is not possible to determine the condition of the component that has the charge or purge relief valve dumping into it because there is no way of telling what proportion of the total case drain flow is due to internal leakage—unless the relief valve can be vented externally while the test is conducted.

When conducting these tests, it is also important to understand that the volume of internal leakage from a hydrostatic transmission cannot exceed the flow rate of its charge pump. Consider for a moment, a transmission that has a volumetric efficiency of 100%, that is, the pump and motor have no internal leakage. The transmission loop has a total volume of two gallons and is full of fluid. Because there is no internal leakage, there is no need for a charge pump.

When the pump is stroked to maximum displacement, this circulates the two gallons of fluid in the loop at a rate of, let’s say, 50 gpm. Because it’s a closed loop, with no leakage, the flow from pump to motor is 50 gpm and the flow from motor to pump is 50 gpm.

Now let’s introduce internal leakage of 0.5 gpm in each of the pump and motor. The result is that, with no charge pump, after one minute there will only be one gallon of fluid left in the loop (the other gallon will have leaked back to tank). However, within a second of the transmission starting to leak, the transmission pump will start to cavitate and the severity of this cavitation will increase with each passing second until the transmission destroys itself.

If a charge pump with a flow rate of 1 gpm is installed in the circuit, the problem is solved, temporarily at least. With 1 gpm leaking out of the loop and 1 gpm being replenished by the charge pump, the status quo is maintained—until wear causes the internal leakage of the transmission pump and/or motor to exceed 1 gpm.

As you can see, it’s not possible for the internal leakage of a hydrostatic transmission to exceed the flow rate of its charge pump. Charge pump flow rate is typically 20% of transmission pump flow rate. This means that volumetric efficiency can drop to 80% before the transmission will start to cavitate and ultimately destroy itself. The trick is to overhaul the transmission before this point is reached!

About the Author:Brendan Casey is the founder of HydraulicSupermarket.com and the author of Insider Secrets to Hydraulics, Preventing Hydraulic Failures, Hydraulics Made Easy and Advanced Hydraulic Control. A fluid power specialist with an MBA, he has more than 20 years experience in the design, maintenance and repair of mobile and industrial hydraulic equipment. Visit his website: www.HydraulicSupermarket.com.

A case drain is a specific component of a hydraulic system, its objective is to extend the life of a system and reduce time spent on repairs and maintenance.An unrestricted case-drain line is essential on a piston-type hydraulic motor, whether it has axial, radial or bent-axis design. Most skid steers rely on hydraulic systems to power their front loading arms.

Sometimes referred to as a ‘third line’,a case drain drains back the oil which has leaked past the primary seal, and in doing so, prevents pressure from building up against the outer seal.This oil is then returned to the tank or reservoir.

A case drain will have an in-line case drain filter to prevent contaminants from travelling from the hydraulic motor to the tank. Operating a skid steer without a case drain line could result in a full system failure as the shaft seal will be irreparably blown out, if not installed properly your hydraulic line will not work and in worst cases become damaged beyond repair.

A good case drain makes your hydraulic system more energy efficient and lowers the pressure on the tank, good general maintenance of your hydraulic system results in longer durability for your skid steer and attachments.

A case drain is made up of multiple elements whose materials vary, it’s important to know how to remove and disassemble the case drain in order to understand its function and materials. A case drain filter is contained within an aluminum canister.

To remove the filter make sure to plug the drain lines to avoid losing hydraulic fluid or introducing contamination into the system. Simply unscrew the hex nut to access the filter element.

You may be surprised to find that case drain filters are made from a metal, sintered bronze to be specific. To the naked eye, the sintered bronze looks like one solid piece of metal but is actually thousands of bronze spheres that have been sintered together. Sintering is a heat treatment, like welding or soldering, that imparts strength and integrity to a ‘powdered’ material.

Sintering can determine a filter’s porosity which affects what goes through the filter and what doesn’t. Once sintered, the filter is now porous enough to allow hydraulic fluid to flow through it, yet remains dense enough to capture contaminants like metal and rubber debris which will eventually lead to a total system failure if left unmaintained.

Filters in a hydraulic system maintain fluid cleanliness at a level that maximizes component life. The appropriate cleanliness level is based on factors such as operating pressure and the internal clearances of components within a system.

If your case drain filter is blocked, then the hydraulic pressure of the motor will increase severely which will eventually lead to a myriad of mechanical and hydraulic issues and even a total system failure. Seals can be blown allowing hydraulic fluid and lubricant to leak out and also allowing contaminants to make their way into the skid steer and damage it irreparably.

If the filter in your case drain is no longer bronze in colour and looks mucky or dirty we suggest that you replace it. If your case drain is blocked then its worth dissembling the other filters and drain on the hydraulic system to ensure they have remained clean. It’s highly discouraged to attempt to clean your case drain or its filter.

Even if you had power tools or a heavy duty wire brush you will only move more trapped solids into the filter, clogging it even further. Case drain replacements are cheap when compared to replacing your whole final drive. Case drain maintenance is a key part of maintaining the life of your skid steer, and is often overlooked.

The main disadvantage of installing a filter on your hydraulics system is that back pressure created by the filter can cause total system failure caused by excessive pressure on the case drain if installed improperly

In some cases, case drains are considered optional. The case drain line is for low volume flow to the tank. In theory, by installing a high-pressure shaft seal and two check valves then internal leakage is technically drained into the return line, which is the usual function of a case line.

It has generally been found that systems without case drains often result in failure due to shaft seal leaks. Case drain line installation can be tedious but will eradicate any problem relating to shaft seal leakage.

Oftentimes, if a vehicle doesn’t already have a case drain line fitted, the manufacturer will not necessarily outline the need for hydraulic fluid to be returned to the tank. If you want optimum reliability from your tank and hydraulics then fitting a case drain line is the way to go.

Case drain lines are a very specific component, its use is debated among hydraulics experts - some say you need a case drain and others suggest you don’t. Ultimately, understanding how a case drain works is fundamental to upholding your machines maintenance and making sure that your tools last for a long time.

Many system failures in hydraulics are caused by leaks from the tank. It’s important not to neglect your hydraulics system as it could put you, or your workers, at risk.

Once you know how case drain filters work and what their function is within the hydraulic system of a skid steer, then you can visit your mechanical professional and ask for their opinion on whether you need to install a case filter on your skid steer or not.

The case drain line connects the hydraulic fluid reservoir to the final excavator drive motor. Case drain lines function to carry internal leaking fluid away from the excavator drive motor such as the one on an IHI 28N. If this line becomes clogged or otherwise malfunctions, it can cause catastrophic failure to your IHI 28N excavator drive motor.

One of the first steps to ensure the case drain line functions properly is to regularly check and replace the case drain filter when needed. If your machine is equipped with a case drain filter and it isn"t regularly checked and replaced, it can cause a massive build-up of pressure, which can lead to a catastrophic cascade of failures within your system.

Blown pistons, cracked plating on the mini excavator drive motor, blown seals, and damage to the bearings are just some of the possible damages that could occur. In fact, 90% of premature final drive motor failures on Bobcat brand machines are due to a clogged case drain filters.

In addition to keeping an eye on the case drain filters, in order to keep the excavator drive motor performing at the highest standard, it is recommended that the final drive gear oil should be checked about every 100 hours of operation or once a month, whichever comes first. Keeping the final drive gear oil fresh will help increase the longevity of your equipment.

Whether you"re working with heavy equipment or a small machine, maintenance is crucial to keeping everything running efficiently. Don"t let yourself become another statistic of blown excavator drive motors.

Doing regular maintenance on your machines can save you thousands of dollars in parts, labor, and downtime. The longer your excavator drive motor is out of commission, the more revenue you miss out on.

Excavators come in a variety of sizes, but whether you"re working with an IHI 28N or another model it"s crucial that you conduct maintenance when necessary to prevent case drain failure. Mini Final Drives has the IHI 28N final drive motors you need to keep your machine up and running.

To learn more about how case drain failure can impact your excavator drive motors or for more information on the IHI 28N, contact Mini Final Drives today.

CAUTION - Failure to meet these requirements may result in damage to the piston motor. • Install piston motors in such a position that the case drain assures an oil level at or above unit center line. • Before the pump is started, fill the case through the uppermost drain port with hydraulic fluid of the type to be used. • The case of the motor must remain full at all times. • The case drain line must be connected directly to the reservoir and terminate below the oil level. • Oil level must be at or above the unit center line before starting the piston motor. • Provide a case drain line of adequate size to limit the case pressure to specified maximum.

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