ELBOW 1058627 - Caterpillar

Illustration 3 g02452796
Main relief valve pressure tap is located behind the left rear access door.
Connect tooling (B2) 41,368 kPa (6,000 psi) pressure sensor to main relief valve pressure tap. Temporary Setting of the Signal Limiter Relief Valve
Illustration 4 g02374477
Main control valve (M316D)
(1) Adjustment screw
(2) Locknut
(3) Adjustment screw
(4) Locknut
(5) Adjustment screw
(6) Locknut
(7) Main relief valve
(8) Load sensing signal limiter valve
Illustration 5 g02374496
Main control valve (M318D, M318D MH, M322D and M322D MH)
(1) Adjustment screw
(2) Locknut
(3) Adjustment screw
(4) Locknut
(5) Adjustment screw
(6) Locknut
(7) Main relief valve
(8) Load sensing signal limiter valve
Loosen locknut (6) on load sensing signal limiter valve (8).
Turn adjustment screw (5) on load sensing signal limiter valve (8) clockwise by one half turn. Note: LS cutoff pressure should now be higher than the main relief valve pressure.
Tighten locknut (6) load sensing signal limiter valve (8). Test Procedure
Start the engine.
Illustration 6 g02451617
Engine speed dial
Set the engine speed dial at "5".
Lower the left console.
Illustration 7 g02446738
Power mode control button located on the soft panel switch
Push down on the power mode control button in order to activate power mode. Note: The indicator light will be illuminated when power mode is activated.
Illustration 8 g02447036
Automatic Engine Speed Control (AESC) as displayed on the programmable function key in the monitor.
Disable the automatic engine speed control through the monitor by pressing the programmable button.
Illustration 9 g02447064
Joystick (front switch)
Disable the hydraulic modulation control, if equipped. Press the front switch on the right joystick in order to deactivate hydraulic modulation.
The air conditioning should be turned off for the following test.
Stall one of the following circuits on the machine in order to obtain a pressure reading:
Blade/Dozer Circuit
Stabilizer CircuitNote: These circuits are used because there are no line relief valves in these circuits.
Check the pressure at the main relief valve pressure tap. Note: Refer to Table 2 in this manual for the correct pressure.
If the main relief valve pressure is not correct, refer to the "Adjustment Procedure". Adjustment Procedure
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Loosen locknut (2) on main relief valve (7).
To avoid damage to the hydraulic components, do not turn the main relief valve adjustment screw into the stop.
Turn adjustment screw (1) main relief valve (7) clockwise in order to increase the pressure. Turn adjustment screw (1) main relief valve (7) counterclockwise in order to decrease the pressure. Note: A 1/4 turn of the adjustment screw will equal approximately 4000 kPa (580 psi).
Check the pressure at the main relief valve pressure tap. Note: Refer to Table 2 in this manual for the correct pressure.Note: Always make the final pressure adjustments on the pressure rise.
Tighten locknut (2) on main relief valve (7) to the specified torque.
Adjust load sensing signal limiter valve (8) to the correct pressure setting. Note: Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust" in this manual for the adjustment procedure.Worksheet
Table 2
"Relief