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Boom Hoist Relief Valve Adjustment-CONT.
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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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Boom Lower Relief Valve Adjustment-CONT.
TM 10-3930-673-20-2
18-5. MAIN CONTROL VALVE ADJUSTMENT/REPLACEMENT (CONT)
f. Boom Lower Relief Valve Adjustment.
(1)
Connect pressure gage to port.
NOTE
Main relief valve pressure must be
adjusted above normal operating pressure
to permit boom hoist relief valve pressure
to be adjusted. Main relief valve pressure
is then returned to normal operating
pressure at end of this procedure.
(a)
Remove main relief valve plug (1).
(b)
Connect 0 - 5,000 psi (0 - 34475 kPa)
pressure gage to plug port (2).
(c)
Remove acorn nut (3) covering slotted
head adjusting screw.
TR01030
(d)
Hold adjusting screw and loosen/back off
jam nut (4).
(2)
Adjust main relief valve pressure to 3,100 psi (21374.5 kPa).
NOTE
Engine may be operated at idle or full throttle when performing pressure tests.
(a)
Start engine (TM 10-3930-673-10).
(b)
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.
(c)
Turn adjusting screw clockwise (in) until pressure on gage reads 3,100 psi (21374.5 kPa).
(d)
Release hydraulic function lever.
NOTE
Pressure must read between 1,000 - 1,100 psi (6895 - 7584.5 kPa).
(3)
Read relief valve pressure on gage. If relief valve pressure is not within specifications, adjust as follows:
(a)
Remove acorn nut (9) covering slotted head adjusting screw.
(b)
Hold adjusting screw and loosen/back off jam nut (10).
18-32

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