SPROCKET 1254403 - Caterpillar

Adjustment Procedure - Implement Discharge Pressure
Illustration 6 g03664394
(18) Implement discharge pressure port
(19) Implement pilot pressure tap
(20) Implement load sense pressure tap
Illustration 7 g03664396
(H) Main implement valve
(J) Load sense relief valve
Locate the load sense relief valve (J) on the main implement valve (H). Best practice is to access the valve from the right side of the machine in the hitch.
Use a hex wrench to loosen the lock-nut and an internal hex to adjust the implement load sense pressure. Turn inwards to increase the pressure or outwards to decrease the pressure. Note: The final pressure adjustment must be inward to increase pressure. If the setting is too high, adjust the pressure down below the target pressure. Then, increase the pressure to reach the final setting.
Tighten the lock-nut and retest the implement discharge pressure to verify setting. Test Preparation - Implement Load Sense Pressure
Load sense pressure can be checked in the same way as implement discharge pressure. Checking the load sense pressure will provide an accurate reading of the pressure signal that is being sent to the implement pump.Ensure that pilot pressures are set before proceeding.
Ensure that the steering lock is engaged.
Ensure that the oil temperature is at least 60° C (140° F)
Ensure that ride control is set to OFF.
Attach a pressure gauge to the implement load sense gauge port (20). Refer to Illustration 8. Test Procedure - Implement Load Sense Pressure
Start the engine and set to high idle.
With the engine in high idle, raise the linkage and allow the linkage to stall in the raise position. Check gauge reading. Refer to Table 1 for specifications.
If pressure is correct, lower linkage and stop engine. Properly purge the system and disconnect the gauge. If the pressure is not within specifications, refer to the "Adjustment Procedure - Implement Load Sense Pressure" section. Adjustment Procedure - Implement Load Sense Pressure
Illustration 8 g03664394
(19) Implement pilot pressure tap
(20) Implement load sense pressure tap
Illustration 9 g03664396
(H) Main implement valve
(J) Load sense relief valve
Locate the load sense relief valve (J) on the main implement valve (H). Best practice is to access the valve from the right side of the machine in the hitch.
Use a hex wrench to loosen the lock-nut and an internal hex to adjust the implement load sense pressure. Turn inwards to increase the pressure or outwards to decrease the pressure. Note: The final pressure adjustment must be inward to increase pressure. If the setting is too high, adjust the pressure down below the target pressure. Then, increase the pressure to reach the final setting.
Tighten the lock-nut and retest the implement load sense pressure to verify setting. Test Preparation - Implement Pump Margin Pressure
Margin pressure can be checked to troubleshoot hydraulic issues. The implement pump margin pressure is the difference between the implement pump load sense pressure and the implement pump discharge pressure. When a load sense signal is sent to the pump, the controller adds some margin pressure on top of the signal.
Two high-pressure gauges or a differential gauge is required to check the margin pressure.
Take note that the