ELBOW 2057879 - Caterpillar

Illustration 9 g06264586
(3) Hose
Disconnect hose (3) from the rear pump controller.Note: Leave the pump controller for the rear pump vented to the atmosphere.
Assemble Tooling (F). Install Tooling (F) on the open end of hose (3).
Lower the cab.Reference: Refer to Disassembly and Assembly, M0082813, "Cab - Tilt".
Operate the engine at HIGH IDLE.
Move the control lever in order to initiate a stall condition in the tilt cylinder.Note: Do not keep the control lever in a stalled condition for more than 10 seconds. Do not return to a stalled condition within 30 seconds of the prior stalled condition.
Record the pump discharge pressure from Tooling (B) into Table 3. The pressure reading from Tooling (B) should be 30000 350 kPa (4350 50 psi).
If pump discharge pressure is not within specifications, perform the steps in "Adjustment Procedure (Cutoff Pressure Valve Spool)" to the front pump.
Tilt the cab.Reference: Refer to Disassembly and Assembly, M0082813, "Cab - Tilt".
Remove Tooling (F). Reconnect hose (3) to the rear pump controller.
Illustration 10 g06264585
(3) Hose
(4) Hose
Disconnect hose (3) and hose (4) from the front pump controller.Note: Leave the pump controller for the front pump vented to the atmosphere.
Connect hose (3) to hose (4) with Tooling (G).
Lower the cab.Reference: Refer to Disassembly and Assembly, M0082813, "Cab - Tilt".
Start the engine. Warm the hydraulic oil to 55° 10°C (131° 18°F).
Operate the engine at HIGH IDLE.
Move the control lever in order to initiate a stall condition in the tilt cylinder.Note: Do not keep the control lever in a stalled condition for more than 10 seconds. Do not return to a stalled condition within 30 seconds of the prior stalled condition.
Record the pump discharge pressure from Tooling (B) into Table 3. The pressure reading from Tooling (B) should be 30000 350 kPa (4350 50 psi).
If pump discharge pressure is not within specifications, perform the steps in "Adjustment Procedure (Cutoff Pressure Valve Spool)" to the rear pump.
Tilt the cab.Reference: Refer to Disassembly and Assembly, M0082813, "Cab - Tilt".
Disconnect hose (3) and hose (4) from Tooling (G). Remove Tooling (G).
Reconnect hose (3) and hose (4) to the front pump controller.
Lower the cab.Reference: Refer to Disassembly and Assembly, M0082813, "Cab - Tilt".
Perform the steps in "Test Procedure (High-Pressure Stall)" in order to reset the load sensing relief valve to 25500 350 kPa (3698 50 psi).Adjustment Procedure (Cutoff Pressure Valve Spool)
Illustration 11 g01323035
Compensator Valve
(5) Margin pressure valve spool
(6) Locknut
(7) Adjustment screw for the margin pressure valve
(8) Adjustment screw for the cutoff pressure valve
(9) Locknut
(10) Cutoff pressure valve spoolAdjustments to the pressure compensator valve can be made on the machine.
Perform Step 1 through Step 14 of "Test Procedure (Margin Pressure)".
Loosen locknut (9). Maintain the position of adjustment screw (8).
Turn adjustment screw (8) clockwise in order to increase the pressure setting. Turn adjustment screw (8) counterclockwise in order to decrease the pressure setting.Note: Turn adjustment screw (8) counterclockwise past the desired pressure setting. Then, turn adjustment screw (8) clockwise to the correct pressure setting. This method of adjusting the pressure setting eliminates any movement