4 - 3
Pilot Relief Pressure
1. Prepare the machine
Put the operator levers into neutral, lower the gate lock
lever. Start the engine and place the machine on level
ground, lower and open the dipper and set the bucket on
the ground. Stop engine.
2. Release the hydraulic oil tank pressure. (See Releasing
Tank Pressure).
3. Connect a 0-100 bar (0-1500 lb/in
2
) pressure gauge and
adaptor (see A) to the port marked P3 on the pump.
4. Start the engine and confirm that the engine is at its
maximum no-load speed and it is in the S mode.
5. Loosen the lock nut B of the Pilot Relief Valve.
6. Adjust the adjusting screw C, to the correct pressure
39.6 ± 2.9 bar (583 ± 48 lb/in
2
)
7. Hold the adjusting screw C in position and tighten the
lock nut B.
8. After locking, check the relief pressure again.
If it is not within the limits above, perform steps 4
onwards again.
9. Stop the engine, release the tank pressure, then remove
the gauge and adaptor from the pump.
Section E
Hydraulics
9803/6400
Section E
4 - 3
Issue 1
Pressure Testing
A
P
3
C
B
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