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Page Title:
ADJUSTMENT OF MAIN RELIEF VALVE - CONTINUED |
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 TM 10-3930-660-24-1
MAIN CONTROL VALVE MAINTENANCE - CONTINUED
0175 00
ADJUSTMENT OF MAIN RELIEF VALVE - CONTINUED
11.
Disconnect pressure gauge from main relief valve port (12).
12.
Install main relief valve plug (11) into port (12) and
tighten.
13.
Replace transmission cover (WP 0150 00).
12
11
15
13,14
409-4068
ADJUSTMENT OF BOOM EXTEND RELIEF VALVE
NOTE
The main relief valve pressure must be adjusted above normal operating pressure to permit the boom extend
relief valve pressure to be adjusted. Main relief valve pressure is then returned to normal operating pressure
at the end of this procedure.
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.
Remove acorn nut (13) covering slotted head adjusting screw (14).
4.
While holding adjusting screw (14), loosen and back off jamnut (15) which secures adjusting screw.
NOTE
Engine may be operated at idle or full throttle when performing pressure tests.
5.
Start engine (TM 10-3930-660-10).
6.
Operate boom extend, retract, hoist or lower function until 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.
7.
Turn adjusting screw (14) clockwise (in) until pressure on gauge reads 3,100 psi (21374 kPa).
0175 00-5
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