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TM 10-3930-643-34
HYDRAULIC SYSTEM TROUBLESHOOTING AND MAINTENANCE.
12-3.
Loader Control Valve. (Sheet 11 of 14)
TESTING/ADJUSTING - FORK CIRCUIT RELIEF VALVES
60.
Position forks in forks
together
position and hold, refer to TM
10-3930-643-10.
61.
Read hydraulic pressure gages.
Front
gage should read 1930 psi and rear
gage 30 psi.
62.
Position forks in forks apart
position and hold.
63.
Read
gage
gage
64.
65.
66.
67.
68.
69.
70.
71.
hydraulic pressure gages. Rear
should read 1930 psi and
front
30 psi.
Using a 1-9/16” open end wrench,
adjust two circuit relief valves on
loader control valve (36) and fork
valve assembly (45), front and rear.
Except for pressure, adjustment of
fork circuit relief valves is same as
main system relief valve adjustment,
step 10.
Stop engine.
Vent hydraulic system pressure, refer
to TM 10-3930-643-10.
Using a 10” adjustable wrench,
disconnect two hydraulic gages from
fork valve assembly (45).
Using a 1“ open end wrench and a 10”
adjustable wrench, disconnect
tube
assemblies (15 and 14).
Using a 10” adjustable wrench, remove
two tees.
Using a 1" open end wrench,
connect
tube assembly (15) to connector (29).
Connect tube assembly (14) to elbow
(27).
Go to sheet 12
12-23
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