2008/08/04 Caterpillar

Backhoe Loader:

414E (S/N: ELB1-UP)

422E (S/N: HBE1-UP)

428E (S/N: SNL1-UP)

416E (S/N: SHA1-UP; CBD1-UP)

Wheel Loader:

930G (S/N: TWR1-UP; TFW1-UP)

930H (S/N: DHC1-UP; FTD1-UP)

ReferenceTesting and Adjusting Manual, KENR5096-00, "414E Backhoe Loader Hydraulic and Steering System", "Hydraulic Pump - Test and Adjust"

ReferenceTesting and Adjusting Manual, RENR6479-02, "416E, 422E and 428E Backhoe Loaders Hydraulic and Steering System ", "Hydraulic Pump - Test and Adjust"

ReferenceTesting and Adjusting Manual, RENR8729-01, "930G Wheel Loader Hydraulic System ", "Piston Pump (Steering, Implement, Pilot) Margin Pressure - Test and Adjust"

ReferenceTesting and Adjusting Manual, KENR7616-00, "930H Wheel Loader Hydraulic System ", "Piston Pump (Steering, Implement, Pilot) Margin Pressure - Test and Adjust"

Adjustment Procedure for Margin Pressure

Illustration 1	g01424758
(1) High pressure cutoff adjustment (2) Set screw (3) Set screw (4) Margin pressure adjustment

Margin Pressure Adjustment

ReferenceRefer to the Testing and Adjusting Manual for your machine in order to obtain the test and adjust procedure.

1. If the margin pressure is not correct, stop the engine. Loosen set screw (3). Use an allen wrench and adjust the pressure adjustment screw (4) .
   • To increase the margin pressure, turn the pressure adjustment screw clockwise. Pressure difference is approximately 1700 kPa (247 psi) per turn.

   • To decrease the margin pressure, turn the pressure adjustment screw outward.

   Note: Do not turn the adjustment screw (4) past the compensator body.

2. Recheck the margin pressure by repeating the test.

3. Once adjustments are complete, hold the position of the adjustment screw (4) and tighten set screw (3) to 7.5 N·m to 10.8 N·m (5 lb ft to 8 lb ft).

   Note: Do not overtighten the set screw.

High Pressure Cutoff Adjustment

Illustration 2	g01621640
View of common valve group (A) Adjuster plug (B) Set screw

Note: The system pressure is set at the implement valve on the listed machines. The high pressure cutoff (1) is factory set. The high pressure cutoff should not be adjusted while the pump is installed on the machine. Any adjustment to the high pressure cutoff setting may result in a valve or pump failure while the pump is installed on the machine. The high pressure cutoff adjustment (1) should only be checked and adjusted on a test bench.