4 - 6
Slew Motor 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 Connect a 0-400 bar (0-6000 lb/in
2
) pressure gauge and
adaptor to pressure test point G2 (see view A on page
4 - 1).
Note: Pressure can also be measured on the upper section
of the slew motor.
3 Initiate slew lock procedures.
a Remove the water-proof connector (dark green wire)
from swing shut off solenoid valve V, which is
mounted at the side of the hydraulic pump.
b Press the slew lock switch ON (on the cab left
console) and confirm that the slew lock symbol
appears on the monitor.
c Start the engine, and operate the engine at around
1000 r.p.m, and operate the slew lever slowly. Listen
to confirm that the relief valve is heard to operate
and check that the machine does not slew.
Note: If the water-proof connector of the slew lock solenoid
valve is not removed (step 3a), slew lock status can be
obtained with the slew lock switch ON (step 3b), but the
slew relief valve does not operate.
d Run the engine at maximum no-load speed in the S
mode.
e Operate the slew lever.
4 The pressure gauge reading should be 279 ± 10 bar
(4045 ± 145 lb/in
2
).
5 If the pressure is within the limits, stop engine, release
tank pressure and remove the gauge and adaptor. If the
readings are outside the limits, continue as below.
6 Pressure Adjustment
Repeat step 3 above and confirm pressure setting.
Adjust the appropriate slew motor relief valve (W for
right slew, X for left slew).
a Remove screw cap Y.
b Adjust the pressure by altering the thickness of shim
Z (increasing the thickness increases the pressure,
decreasing the thickness decreases the pressure).
c Refit screw cap Y.
d After locking, check the relief pressure again. If it is
not within the specified limits (see step 4 above)
repeat steps 6a to 6d.
e Repeat step 5 above.
Section E Hydraulics
9803/6410
Section E
4 - 6
Issue 1
Pressure Testing
AA
BB
A296530
JS06250
312470
302880
WW
XX
ZZ
YY
VV
296590a
To Next Page
Loading...
Need help?
General
