ARM 8B3453 - Caterpillar

Illustration 2 g00293506
Tooling for the Main Pump (3) Pressure tap (Destroking pressure)
Connect a 60000 kPa (8600 psi) pressure gauge to pressure tap (1) .
Connect a 4000 kPa (580 psi) pressure gauge to pressure tap (2) .
Connect a 25000 kPa (3600 psi) pressure gauge to pressure tap (3) .Test and Adjust
Start the engine.
Lower the left console.
Adjust the engine speed to HIGH IDLE by turning the engine speed dial to position 10.
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Main Control Valve ( M313C, M315C, and M316C) (4) Locknut (5) Adjustment screw (Main relief valve pressure)
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Main Control Valve ( M318C, M318C MH, M322C, and M322C MH) (4) Locknut (5) Adjustment screw (Main relief valve pressure)
Loosen locknut (4) on the main relief valve.
Turn adjustment screw (5) by three full turns counterclockwise.
Move the right joystick to the full BUCKET CLOSE position until the cylinder is fully extended.Note: Stall the bucket in the BUCKET CLOSE position.
Turn adjustment screw (5) clockwise and watch the pressure gauge on pressure tap (1). Continue turning the adjustment screw clockwise until the pressure is 10000 kPa (1450 psi).Note: The pressure at pressure tap (3) should be 0 to 500 kPa (0 to 73 psi).
While the engine is running, maintain the power shift pressure at a constant pressure. Use the following procedure to obtain the constant power shift pressure:
Illustration 5 g00917706
Right Side of Cab Seat (6) Service tool connector
Connect the Electronic Technician (ET) to service tool connector (6) of the machine.
Start Electronic Technician.
Select the "Engine ECM" from the list of available controls.
Select "OK".
Select "Diagnostics" from the main menu.
Select "Diagnostic Tests".
Select "Override Parameters".
Select "Main Pump Power Shift Pres Sol Current Override".
Illustration 6 g00918489
ET (Diagnostic Override Screen)
Select the "Change" button.
Enter a current value of "0".
Select "OK".
Select "Yes".
Select the "Change" button.
Table 2
Main Pump Destroke Pressure At Mode P    
Machine Model     Reference Current Value (Ampere)    
M313C     0.540    
M315C     0.570    
M316C     0.600    
M318C and M318C MH     0.540    
M322C and M322C MH     0.550    
Enter a current value in order to set the "Mode P" pressure for the main pump (proportional reducing valve). Start with the reference current value that is shown in Table 2 for your machine. Refer to Testing and Adjusting, "Specifications" in this manual for the correct "Mode P" pressure for the main pump (proportional reducing valve).Note: You must first enter a current value of "0" whenever you are changing the existing current value.
Select "OK".
Select "Yes".
Check the pressure at pressure tap (2) .
Repeat Steps 8.m through 8.q until the correct pressure is reached.
Move the right joystick to the full BUCKET CLOSE position until the cylinder is fully extended.Note: Stall the bucket in the BUCKET CLOSE position.
Adjust the main relief valve in order to increase the main pump pressure at pressure tap (1) .Refer to Testing and Adjusting, "Specifications" in this manual for the correct destroke pressure at "Mode P" for your machine. When the main pump destroke pressure at pressure tap (1) is set to the correct pressure, there should be a sudden pressure increase at pressure tap