Quantcast Boom Lower Relief Valve Adjustment-CONT.

 

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Boom Lower Relief Valve Adjustment
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TM-10-3930-673-20-2 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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ATTACHMENT CONTROL VALVE REPLACEMENT
TM 10-3930-673-20-2
(c)
Operate boom lower function until boom is fully lowered. Continue to hold boom control lever in position
so hydraulic oil passes over relief valve.
(d)
To increase relief pressure, turn adjusting screw clockwise (in). To decrease pressure, turn adjusting screw
counterclockwise (out).
(e)
When desired relief pressure shows on gage, release boom hoist lever.
(f)
Hold adjusting screw in position and tighten jam nut (10).
(g)
Install acorn nut (9).
(h)
Shut off engine (TM 10-3930-673-10).
(4)
Adjust main relief valve pressure to between 3,000 - 3,100 psi (20685 - 21374.5 kPa).
(a)
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.
(b)
Turn adjusting screw counterclockwise (out) until pressure on gage reads between 3,000 - 3,100 psi (20685 -
21374.5 kPa).
(c)
Release hydraulic function lever.
(d)
Hold adjusting screw bin position and tighten jam nut (4).
(e)
Install acorn nut (3).
(f)
Shut off engine (TM 10-3930-673-10).
(5)
Remove pressure gage.
Remove pressure gage from main relief valve plug port (2).
(6)
Install main relief valve plug (2).
Install main relief valve plug (1) in port (2).
(7)
Replace transmission cover (Para 16-5).
END OF TASK
18-33

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