Nov 18, 2014 this is the first of a special set of videos we have created on hydraulic systems and troubleshooting. The axial piston pump has a series of cylinders typically 7 or 9 mounted parallel to the axis of rotation. Session 1 will include components of a hydraulic system, and the fundamental elements that. Yet, most of the problems encountered in all of these systems are often traced down to a few basic issues. For this reason, it is important to make sure pump intake lines are in good condition and all clamps and fittings are tight. Other supplementary information on specific components such as pumps, cylinders, and valves will be found in other data sheet issues, and is referenced in the.
A slotted rotor is fixed to a shaft that enters the pumphousing cavity through one of its end plates. When the new pump also did not build pressure, the manual valve in the outlet line was closed to isolate the pump from the system. Typically, the cleaner the hydraulic system is maintained, the. Hydraulic trouble shooting hydraulic systems can be very simple, such as a hand pump pumping up a small hydraulic jack, or very complex, with several pumps, complex valving, accumulators, and many cylinders and other actuators.
Our troubleshooting hydraulic pumps and accumulators manual, which has become the standard of excellence in hundreds of mills across the united states and canada. Pumps which may be vane, gear, or piston types are used in hydraulic systems to produce sufficient flow to obtain the speed required from cylinders or motors. This speed oil flow can be increased or decreased by using a pump of higher or. Understanding the cause and remedy of your pump issue, along with some simple preventative steps, you can get back on track with smooth hydraulic metering pump. The table below lists the most common problems press operators experience, their causes and. Gradual or sudden loss of pressure or flow resulting in a loss of power is common in hydraulic system failure. The life expectancy of all hydraulic components is directly related to the cleanliness of the hydraulic system that it operates within. Hydraulic pumps must be completely sealed and leak free. Use compressed air to pressurize reservoir while running pump or fill inlet hose with oil from the pump end. Hydraulic repair hydraulic cylinder repair hydraulic. Many of the failures in a hydraulic system show similar symptoms.
Dec 17, 2011 this results in a much weaker shaft that is almost twice as susceptible to deflection in the event of a hydraulic upset condition such as that which may occur close to the shutoff point on the curve. The hydraulic slideout system is a fixed displacement system, using double acting hydraulic cylinders to open and close a room assembly built into the travel trailer or motor home. Vanetype hydraulic pumps generally have circularly or elliptically shaped interiors and flat end plates. This new format allows the reader to practice disassembly and reassembly of practically any type of mechanical device in a 3d view. Cylinders are energized by a 12 volt dc high pressure hydraulic pump through electrically. Thank you for visiting gpm hydraulic consulting webpage. The following lists information when troubleshooting relief, pressurereducing, pressure sequence, and unloading valves. Hydraulic pump motor division hydraulic flow is developed as the pump rotating group is driven by a prime mover hydraulic pump basics fluid is forced out of pump at the pump outlet a partial vacuum is created at the pump inlet and atmospheric pressure forces fluid into pump.
Clean the port areas thoroughly before disconnecting the hydraulic lines. Vickers systems to the extent permitted by law accept no. Please read and observe the hydraulic product safety page before proceeding further. L2550 hydraulic power steering pump failure, pump opened to show damage. Symptoms of common hydraulic problems and their root causes. Understanding and troubleshooting wastewater pumping system. System tests for piston pumps when a hydraulic system has problems, it is common practice to first look at the pump. Our professional hydraulic consultants are here to serve you in the areas of hydraulic training, troubleshooting and reliability.
Rachel will help you take the guesswork out of your ford 8n, 9n or 2n hydraulic system. In fact, the cylinders may stall under light loads or may not move at all. If the valve discharges to tank, disconnect the tank line and connect a hose from the valve, feeding into a bucket. Hydraulic system troubleshooting advanced fluid systems. This data sheet describes a stepbystep checkout procedure for hydraulic systems which have previously been working satisfactorily but which have developed trouble, usually over a 24hour working period, which renders them.
If the hydraulic pump is the heart of the system, then the hydraulic oil is the life blood and the functions of hydraulic oil can be summarized. Basic hydraulic troubleshooting learning system aidex. Logical troubleshooting in hydraulic systems is intended as a guide to systematic fault findings in a hydraulic system. Go hydraulics is a complete hydraulics service centre specializing in repairing and reconstruction of hydraulic components, such as.
Hydraulics trouble shooting guide advanced fluid systems. When a hydraulic system has problems, it is common practice to first look at the pump. The arrangement is similar to shell chambers in a revolver. Common conditions requiring pump troubleshooting expertise are cavitation, hydraulic imbalance, undersized shafts, and mechanical seal failure. Disclaimer this service manual has been prepared by parker hannifin for reference and use by mechanics who have been trained to repair and service hydraulic pumps and systems on commercial and noncommercial equipment applications. Pump running but not lifting charge the battery check for loose battery cableswires and verify the ground is good is the trailer overloaded. Before starting the hydraulic pump, fill the pump with hydraulic oil. Pumps need to be sized based on pressure, flowrate and head. If you dont detect it, theres a good chance the problem is elsewhere. If you are facing problems in working conditions, the troubleshooting tables for vane pumps and vane motors in. The pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a sudden or gradual failure in the system. Hydraulics troubleshooting january 2019 hydraulic power units when there is a problem with a kti power unit. We look forward to serving you with your hydraulic needs.
However, this occurs best at the manufacturers recommended capacity. Troubleshooting 767 hydraulic hand pump troubleshooting problem possible cause probable remedy oil leak at coupler. An effective pump troubleshooting tool will always begin with the question when did this start. The oil level is correct when the top gauge is half full. The difference in elevation or pressure between the inlet water level and the effluent water level.
This can happen on a new system after only a few hours operation as well as on a system which has been in service for a long time. The process of troubleshooting should always begin with checking and eliminating the easy things first. The pumps will stop automatically if the level drops to the shutdown level. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. Do not use teflon tape on pipe thread fittings pump is hot. View and download parker p2 series service manual online. Having taken a measurement at a certain point in a system, it is obviously. Professional instruction from our consultants who have solved numerous hydraulic problems through handson experience. Frontend loader hydraulics troubleshooting it still runs. Symptoms of common hydraulic problems and their root causes brendan casey. The tank, valves and cylinders were cleaned and a replacement pump installed. Plug the pump ports and cover the open hydraulic lines immediately after theyre disconnected. Hydraulic system troubleshooting pellerin milnor corporation.
If in doubt, always refer to the original equipment manufacturer. The machine in question had a complex hydraulic system, the heart of which comprised two engines driving 10 pumps. Minor seat imperfections may be corrected by reseat use repair kit 50034349 to replace all oring seals, balls ing. Item c, operate pump for a few seconds until fluid comes out of port, replace relief valve torque to 22nm and retry unit air being introduced in system if air is being introduced in the system, the gear pump might have some priming problems. The first section of this school, introduction to hydraulics is a more indepth study of general hydraulics and should be studied before continuing in this section. Pressure pump and related control components components on top of press dbet card in control box legend 1. Formulas include those commonly used for cylinders, hydraulic pumps and motors, and vehicle sizing. Please read this operating manual carefully and follow the instructions provided. Troubleshooting tips for hydraulic systems download data sheet this data sheet describes a stepbystep checkout procedure for hydraulic systems which have previously been working satisfactorily but which have developed trouble, usually over a 24hour working period, which renders them inoperative. Troubleshooting hydraulic systems and components workshop 40 hours the troubleshooting hydraulic systems and components workshop for mobile and industrial hydraulics covers the following topics. Put your hand on valve to feel or listen for leakage.
Step 1 pump inlet strainer probably the field trouble encountered more often is cavitation of the hydraulic pump inlet caused by dirt buildup on the inlet strainer. Drain the oil and clean the exterior of the pump before making repairs. Each component in the system must be compatible with and form an integral part of the system. Troubleshooting tips for hydraulic pumps womack machine. This pump troubleshooting guide can help with your common pumping concerns. Use a soft brass rod and hammer to tap the ball and springs. The article has been written keeping in mind the level and interests of students and the beginners in operation. Each piston has a spherical end that mounts in a shoe fig. Hydraulic pump troubleshooting guide no oil flow from pump. Troubleshooting and preventive maintenance of hydraulic.
There are many different forms of hydraulic presses but the most simple kind is the hand operated hframe press. Troubleshooting hydraulic pumps al smiley, gpm hydraulic consulting when a hydraulic issue occurs, the pump usually is one of the first components changed. Hydraulic pumps fixed displacement pumps the gpm of the fixed displacement pump can not be varied. These stepbystep procedures should help you locate and remedy. Logical troubleshooting in hydraulic systems eaton. Also, the pump assembly has a large canister attached for the hydraulic fluid filter. The maintenance staff recently reported that the pump pistontype had failed for reasons unknown at this time. Pump fault mcc or standby pump fault mcc identified by pump motor output gives alarm to control desk if that pump is not running. Worn pump, valve, motor, cylinder or other component. Air usually enters the hydraulic system through the pump s inlet. Figure 39 illustrates a vane pump with a circular interior.
Hydraulic system troubleshooting pellerin milnor corporation figure 35. Psi setting could be too low internal issues with pump very rare 2. If you do see the pump heat up instantly you just found your culprit, and it took you but a couple of minutes. The grader hydraulic system the hydraulic pump is driven at the flywheel end of the engine. Centrifugal pump problems 5 overview of pump problems typically found on centrifugal pumps. Buchermonarch pump and cylinder troubleshooting brimar dump trailers pump wont lift. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge pump not primed verify suction pipe is submerged. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem. Parts and repair information hydraulic supply company.
Hydraulic systems may be very complex, but every system, no matter how basic, must contain a reservoir, a pump, various valves to control oil flow, direction and. System test for pressure relief valves system test for sequence valves. A hydraulic pump utilizes the twoposition, threeway solenoid valve to control the pump outlet pressure shown in figure 2. This speed oil flow can be increased or decreased by using a pump. Students will start with an overview of hydraulic principles and progresses through hydraulic system components including pumps, valves, cylinders, motors, rotary actuators, accumulators and filters with emphasis placed. A system curve is a graphical representation of the relationship between flow and head in a fixed hydraulic network. Last year i received a troubleshooting call from a paper mill in wisconsin where one of the pressure compensating pumps had been changed because it would not build and maintain pressure. Day one of this hydraulic repair and troubleshooting course focuses on examining what hydraulic systems are and how they work. We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of. When working on a specific machine, refer to a machines technical manual for more information. The new pump is delivering a maximum pressure of 1,000 psi and appears to be creating heat. Use only those repair parts called out in the parts list in this document. Follow these steps to determine exactly where your problem lies. Dec 15, 2014 pat clark of lifting gear hire demonstrates a few troubleshooting solutions for your hydraulic cylinders and pumps in the hopes of ensuring a successful and productive project.
Changing the filter regularly is a must to maintain optimum power in the hydraulic circuit. Hydraulic line from proportional valve to pump control port 4. Listen for distinctive cavitation sound from pump and verify all hydraulic hoses. Troubleshooting tips for hydraulic systems womack machine. Condensed table causes of trouble and their effects in hydraulic installations. The benefits of this approach are clearly illustrated by a recent troubleshooting situation. Items found in the parts list have been carefully tested and selected by otc. Troubleshooting tips for hydraulic pumps download data sheet the pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a sudden or gradual failure in the system. Kubota bx23 hydraulic cylinder piston repair front loader. Condition likely cause correction muncie power products. The hydraulic hand pump manual has been updated to include cuttingedge imaging technology by ngrain.
We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of your hydraulic equipment. For example, an inadequate size filter on the inlet of a pump can cause cavitation and subsequent damage to the pump. Images in this pdf files displaying an ngrain logo are interactive. A predominant condition requiring troubleshooting expertise in centrifugal pumps is referred to as cavitation.
Troubleshooting hydraulic system problems troubleshooting. Vickers systems to the extent permitted by law accept no liability for loss or damage suffered as a result of the use of this guide. The gpm of the fixed displacement pump can not be varied. Troubleshooting and preventive maintenance of hydraulic systems. We have a hydraulic system that operates two cylinders. How to troubleshoot the inlet side of a hydraulic pump 2. Because of this, the following points should be considered. Chapter 7 hydraulic system troubleshooting general the following troubleshooting information is provided as a general guide to identify, locate and correct problems that may be experienced with the hydraulic system of this crane.
Hydraulic gear pump and motor failure analysis and repair. Working mechanism of a centrifugal pump a centrifugal pump is one of the simplest pieces of equipment in any process plant. Even though these presses are extremely durable, there are a few common problems that come up with every day use. One cannot estimate the lifetime expectancy of these pumps by simply calculating the lifetime of the ball bearing as no. Flow from the pump is directed to the flow regulator.
Dc power unit troubleshooting guide kti hydraulics, inc. Take temperature readings at the pump, pump case, and various valves to identify a noticeable temperature rise possible internal leakage. Table of contents overview 1 pump disassembly 2 control disassembly reassembly 7 pump reassembly adjustment procedures dr control 19. Running volutestyle pumps at a lower capacity than the manufacturer recommends can put lateral stress on the shaft of the pump, increasing wearandtear on the seals and bearings, and on the shaft itself. Hydraulic fluid and temperature recommendations for industrial machinery 16. It is expected that all troubleshooting and testing will be performed by a qualified hydraulic technician. Unlike most other hydraulic technologies, the parker vane pump design is hydraulically balanced. Preface this is a discussion of basic hydraulics which can help with the diagnostics and repair of hwh hydraulic leveling and room extension systems. So, whenever you detect insufficient pressure in a gear pump driven hydraulic system, check the pump body for instant overheating.
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