4 - 5
Pilot Relief Valve
1 Prepare the Machine
Put the operator levers into neutral and lower the gate
lock lever. Start the engine and park the machine on
level ground. Operate the dipper out and lower the
boom to set the bucket on the ground. Stop the engine.
Release the hydraulic oil tank pressure. (See Releasing
Tank Pressure).
2 Before testing the Pilot Relief valve (K), connect a 0-100
bar (0-1500 lb/in
2
) pressure gauge to test point G3 (see
view A on page 4-1).
3 Start the engine and confirm that the engine is at its
maximum no-load speed and it is in the S mode. The
pressure gauge reading should be compared to the
technical data at the start of this section. If it is outside
the limits adjust the pilot relief valve as below.
4 Stop the engine.
5 The valve is adjusted by turning relief valve K ( one turn
of the adjustment screw equals 39.2 bar).
6 After locking, check the relief pressure again.
If it is not within the limits above, perform steps 3 to 6
again.
7 Stop the engine, release the tank pressure (see
Releasing Tank Pressure) and then remove the
pressure gauge.
Section E Hydraulics
9803/6410
Section E
4 - 5
Issue 1
Pressure Testing
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