Service and Repair Manual June 2021
Hydraulic Pump
78 GS
™
-84 • GS
™
-90 Part No. 1306587GT
How to Adjust the Pump Neut ral
How to Adjust the Pump Neutral
Models with Eaton Pumps:
1 Raise the drive wheels off the ground and set
the chassis on blocks.
2 Locate the pump at the rear of the engine.
Tag and disconnect the wire harness from the
Electronic Displacement Controller (EDC)
coils at the pump.
3 Locate the pump neutral adjustment screw at
the top of the solenoid valve body at the
pump.
4 Tee a 0 to 1000 psi / 0 to 75 bar pressure
gauge into the hydraulic line at the smaller
filter port at the rear of the pump.
5 Start and run the engine at low idle.
6 Loosen the lock nut of the pump neutral
adjustment screw at the top of the EDC.
7 Turn the adjustment screw in a clockwise
direction until the reading on the pressure
gauge drops to its lowest point. Note the
position of the screw.
8 Turn the adjustment screw in a counter
clockwise direction until the reading on the
pressure gauge reaches it highest point.
Continue to turn the adjustment screw in a
counter clockwise direction until the reading
on the pressure gauge drops to its lowest
point. Note the position of the screw.
9 Turn the adjustment screw in a clockwise
direction to a position halfway between the
positions noted in steps 7 and 8.
10 While holding the adjustment screw in
position, tighten the adjustment screw locknut.
Torque to 9-11 ft-lbs / 12-15 Nm.
11 Turn the engine off. Remove the blocks and
lower the machine to the ground.
1 pump neutral adjustment screw
2 EDC
3 large filter port
4 smaller filter port
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