TM 5-3805-260-241 Move the control lever to the respective OPERATEposition.2. Get the engine to test rpm.3. Make an adjustment to the manual load valve to get1000 psi pressure.4. Keep the system constant with these conditions.5. Write down the flow rate (gpm) for each test.The flow differential for each test (15, 16, and17) is found by:Subtract the flow rate (gpm) for each test fromits respective base flow rate (12 minus 15, 13 minus 16,and 14 minus 17).The percent of flow loss for each test 15, 16, and17 is found by:Divide the flow differential by its respective baseflow rate and multiply by 100.Test 20: System Oil Temperature1. Open the manual load valve fully.2. Move the elevator control lever to the FORWARDSLOW position.3. Write down the oil temperature.Make a comparison of the oil temperature fromTest 11 and 20. Test 11 must be 150 5 F and Test 20must be inside of (within) 10 F of Test 11. For each 10F higher difference, subtract . 5 gallon per pumpcartridge from the leakage rate. For each 10 F lowerdifference, add . 5 gallon per pump cartridge to theleakage rate.Test 21: Bowl Circuit Drift ComparisonTest 21 is a comparison of visual drift rates forthe bowl circuit. This test is used to check the conditionof the carry check valves. Raise the bowl approximatelyone foot off the ground. Turn the manual load valve allthe way out for minimum restriction. Stop the engine.With the bowl control lever in the HOLD position,look for a down drift (movement) in the bowl. Then movethe control lever to the RAISE position. Look for downdrift again. If the drift in the RAISE position is more thanthe drift in the HOLD position, put a circle around the Min theTest Data box. If the drift in the RAISE position is thesame or less than the drift in the HOLD position, put acircle around the S in the Test Data box."Is It Necessary to Make More Tests?If So, Which Circuit(s)?"Make a comparison of the test data on Charts Aand B for the specific machine under test. The percentof flow loss on Charts A and B is the maximum for bestperformance.Components that are worn, or do not workcorrectly, are found by their flow differential and percentof flow loss or lower system efficiency. System valuesfor new and rebuilt machines must not be more than thepercent of flow loss in the system tests shown on ChartA or B for the specific machine. The permissible flowdifferential is a function of machine application. If theflow loss is acceptable, the Tee Test is complete.If the flow loss is not acceptable in one or moresystems, the tests for the pump and/or the blockedcircuits must be done.If the flow loss is not acceptable in only one ofthe circuits, do the tests for that circuit as shown on theinsert pages. The leakage rate of any component in acircuit is found by:Subtract the test information with the compo-nent in the circuit from the test information with thecomponent out of the circuit.TroubleshootingThe examples that follow are a list of problemsand probable reasons. They will give aid to find thelocation of the components that are worn, or do not workcorrectly. Not all probable reasons have an applicationto all machines.PROBLEM: Setting for the main relief valve is higheror lower than given in Test 1. Percent offlow loss for Tests 4 through 7 is 15% to50%.PROBABLE REASON:Setting for main relief valve is not correct andleakage is too high.RECOMMENDATION FOR ACTION:Make adjustments to the main relief valve to getthe correct pressure. Make a test for leakage in theproblems that follow.4-40
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