CONTROL GP-STEERING & XMSN 4232819 - Caterpillar

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Control and Gauges for the Test Bench (36) Auxiliary pump pressure (37) Signal pressure (38) Control for signal pressure (39) "Flow meter 1" discharge pressure (40) Control for auxiliary pump pressure (41) "Flow meter 2" discharge pressure (42) Auxiliary pump flow control (43) "Flow meter 2" discharge flow (44) Discharge flow for auxiliary pump (45) "Flow meter 1" discharge flow (46) "Flow meter 1" load control (47) Speed and direction control (48) "Flow meter 2" load controlPort Locations
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Typical port locations and adjustments. (49) Case drain port (50) Adjustment screw for maximum angle (51) Adjustment screw for margin pressure (52) Adjustment screw for high-pressure cut (53) Discharge port (54) Pressure port for load sensing (55) Case drain port (56) Suction portPump Setup
Connect a one inch high pressure "XT-6 " rated hose from the pump discharge port (53) to the flow meter inlet on the test bench.
Connect a one inch high pressure "XT-6" rated hose from the flow meter outlet on the test bench back to the tank.
Connect the oil supply suction hose to pump suction port (56) .
Purge all air from the suction line before rotating the pump. Loosen the suction hose at the pump until oil leaks from the connection. Tighten the suction fitting.
Fill the pump case with oil before rotating. Pour oil directly into a case drain port until the case is full.
Connect an in-line flow meter to the case drain port (49) or (55). Direct the oil from the in-line flow meter back to tank.
Do not rotate the pump the wrong direction. The correct direction of rotation will be stated on the pump. The direction of rotation is viewed from the input shaft end. Visually check for proper rotation of the test bench.Test Procedure
Note: The steps in the procedure correlate with the steps under the test specifications according to your specific part number.The hydraulic oil in the test bench should meet an ISO rating of 16/13. The oil in the test bench should be one of the following.
SAE 10W at 50 °C (122 °F) or
Mobil DTE-11 at 46 °C (115 °F)
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(F) Discharge Flow (P) Discharge Pressure
Start rotating the pump according to the RPM given in Step 1 of the ""Test Specifications"". Listen for abnormal noise and verify flow from the pump. Be sure all connections are secure and not leaking. Check for leaky shaft seals and control valve connections.
Slowly increase the input RPM to the value in Step 2 of the ""Test Specifications"". The adjustment screw for the maximum displacement (50) may need to be adjusted in order to achieve the correct discharge flow. The pump may not be feasible if the actual flow is less than the value in Step 2 of the ""Test Specifications"". The pump should be disassembled and inspected.
Increase the pump discharge pressure to the value in Step 3 of the ""Test Specifications"". Compare the actual case drain value with the case drain value in Step 3 of the ""Test Specifications"". This value is an indication of the pump