PREPARATION OF SYSTEM FOR TEST - TM-5-3805-260-24

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 NOTE: Install the adapter as rapidly as possible to keep the oil loss at a minimum. 4. Connect the supply line from the flow meter to the supply line adapter. WARNING: Do not install the adapter for the supply line for the pump or the return line assembly with the engine ON (running). Injury to personnel can be the result. PREPARATION OF SYSTEM FOR TEST 1. Open the manual load valve fully (turn counterclockwise). 2. Start the diesel engine. 3. Move the elevator control lever to the FORWARD SLOW position. 4. With the engine at 2000 rpm, slowly turn the manual load valve clockwise until the pressure goes up to 1000 psi. 5. Look at the oil temperature gauge. 6. When the oil temperature is 100° F, turn the manual load valve clockwise until the pressure is 1500 psi. 7. When the oil temperature is 160° F, run the elevator FORWARD and REVERSE, SLOW and FAST. 8. Run the elevator as long as needed to get the desired oil temperatures of 150° F all through the system. 9. Put a chain around the elevator so it will not move. SCRAPER ELEVATOR SYSTEM TEST (CHART B) Write Down the Basic Test Data NOTE: Conditions in the hydraulic system must be constant before you write down the test data. The control levers must be held in the exact position desired. Best results are found when oil temperature is 150 5 F. Test 10: Maximum Pressure Relief Valve Setting 1. Open the manual load valve fully. 2. Move the elevator control lever to FORWARD SLOW position. 3. With the engine throttle at test rpm, slowly close the manual load valve until oil flow through the flow meter stops (0 gpm). NOTE: The test rpm is given on the Procedure Data Sheet, CHART B (Page 4-39). 4. Write down the pressure and engine rpm. 5. The setting for the relief valve for maximum pressure must be according to the Service Manual. CAUTION: When the pressures are higher than 1000 psi, slowly open manual load valve then release the control lever. This will prevent possible damage to the pressure gauge. Test 11: System Oil Temperature 1. Open the manual load valve fully. 2. Move the ejector control lever to FORWARD SLOW position. 3. Write down the oil temperature. Oil temperature must be 150 5 F. Tests 12, 13 and 14: System Base Flow Rate These three tests are similar. Each test is done as follows: 1. Move the control levers to the respective OPERATE position. 2. Get the engine to test rpm. 3. Make an adjustment to the manual load valve to get a pressure of approximately 100 psi. 4. Keep the system constant with these conditions. 5. Write down the flow rate (gpm) for each test. Tests 15, 16 and 17: Leakage Rates These three tests are similar. Each test is done as follows: 4-37

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