TM 5-3805-260-242. Run the engine at any rpm with the systempressure at 0 to 100 psi.3. Write down the oil temperature.Find the leakage rate of the cylinders and theleakage rate of the control valves. Use the testinformation from the System Tests, Pump Test andBlocked Cylinder Tests.Example: Find the leakage rates in the RIGHTTURN position.Test 15: flow rate of the pump only.Test 27: flow rate of pump and control valve.Test 4: flow rate of pump, control valve andcylinders.The system components tested in Tests 15 and 27are the same except for the control valve. Then thedifference in flow rates must be the leakage in the controlvalve (take the test information for Test 27 away from thetest information for Test 15).The system components tested in Tests 27 and 4are the same except for the cylinders. Then thedifference in flow rates must be the leakage in thecylinders (take the test information for Test 4 away fromthe test information for Test 27).Make a comparison of the test data with the data onChart C for the specific machine under test. Theinformation on Chart C is the maximum for bestperformance.TroubleshootingPROBLEM: Tests 27 and 28 give an indication ofleakage in one or more of the cylinders.PROBABLE REASON:A. Leakage in only one of the cylinders.B. Leakage in both cylinders.RECOMMENDATION FOR ACTION:Do the Blocked Cylinder Test for cylinders on the rightside.PROBLEM: Test 27 and 28 give an indication ofleakage inthe valves.PROBABLE REASON:A. Leakage in the relief valve.B. Wear or damage in the valve body or valve spool.C. Hand metering pump, unloading valve, selectorvalve or diverter valve is worn or not working correctly.RECOMMENDATION FOR ACTION:A. To find the leakage on machines withsupplemental steering, use a Blocking PlateAssembly between the diverter valve and thecontrol valve for steering.B. Inspect the components of these valves to findthe problem.Right Side Cylinders BlockedIf the Blocked Cylinder Tests gives an indication ofleakage that is too high in one or more of the cylinders,do the Blocked Cylinder Tests for the Right Side. Forbest accuracy, turn the steering wheel through severalcycles to get the temperature of the oil in the cylindersthe same as the temperature of the oil in the hydraulictank. Make the temperature of the complete system150° F.1. Install the safety link.2. Lower all implements to the ground.3. Stop the engine.4. Move the steering wheel from RIGHT TURN toLEFT TURN several times to release anypressure oil in the cylinder lines.5. Move the steering wheel back to center.6. Remove the cap for the hydraulic tank to releaseany pressure and tighten the cap again.7. Put a Blocking Plate Assembly in the rod end ofthe right steering cylinder.Test 34: System Oil Temperature1. Open the manual load valve fully.2. Start the diesel engine.3. Run the engine at any rpm with the systempressure at 0 to 100 psi.4. Move the steering wheel to the RIGHT TURNposition.5. Write down the oil temperature.Test 35: STEER RIGHT Flow Rate1. With the manual load valve fully open, move thesteering wheel to the RIGHT TURN position.2-123
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