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Page Title:
ADJUSTMENT OF MAIN RELIEF VALVE |
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 TM 10-3930-660-24-1
MAIN CONTROL VALVE MAINTENANCE - CONTINUED
0175 00
ADJUSTMENT OF MAIN RELIEF VALVE
NOTE
Adjustment of main control valve assembly is limited to adjustment of relief valves. There are a total of four
relief valves on the main control valve assembly.
1.
Remove main relief valve plug (11) from relief valve
port (12).
2.
Connect 0 to 5,000 psi (0 to 34474 kPa) pressure
gauge to relief valve port (12).
3.
Start engine (TM 10-3930-660-10).
4.
Operate boom hoist, lower, extend or retract function
until cylinder bottoms out and hydraulic oil is passing
over relief valve. Continue to hold hydraulic lever in
that position so oil passes over relief valve during
relief valve adjustment.
12
11
4
13,14
409-656
NOTE
Engine may be operated at idle or full throttle when performing tests/adjustments.
5.
Read relief valve pressure on gauge. Pressure range is 2,750 to 2,850 psi (18961 to 19650 kPa). If relief valve pressure
is not within specifications, continue with steps 6 thru 12.
6.
Remove acorn nut (13) covering slotted head adjusting screw (14).
7.
While holding adjusting screw (14), loosen and back off jamnut (15) which secures adjusting screw.
8.
To increase relief pressure, turn adjusting screw (14) clockwise (in). To decrease pressure, turn adjusting screw (14)
counterclockwise (out).
9.
When desired relief pressure is obtained, hold adjusting screw (14) in position and tighten jamnut (15). Install acorn nut
(13).
10.
Stop engine (TM 10-3930-660-10).
0175 00-4
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