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BOOM EXTEND CYLINDER SLOW OR DOES NOT EXTEND OR RETRACT - continued - TM-10-3930-673-20-10878
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TM-10-3930-673-20-1 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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LEFT AND RIGHT REAR STEERING CYLINDERS DO NOT EXTEND OR RETRACT.
TM 10-3930-673-20-1
WARNING
Hydraulic oil in the system can be under pressures over 3000 psi with engine OFF. Always relieve pressure in hydraulic lines
before attempting to remove any component in the hydraulic system. With engine OFF, starter switch in RUN position, and MLRS
attachment on the ground, move control levers through all operating positions several times to relieve live pressure. Relieve
pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious
personal injury.
At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injuries. Allow hydraulic oil to cool before
disconnecting any hydraulic lines.
HYDRAULIC JOYSTICK CONTROL VALVE
PRESSURE TEST
(1) Place hydraulic joystick in neutral
position and check the pressure at the
hydraulic joystick control valve "p" port.
(a) If hydraulic oil pressure is null go to
Step (2) below.
(b) If not, replace joystick control valve
(Para 18-11).
(2) Place hydraulic joystick in raise
position and then in lower position.
Check pressure at input lines to
hydraulic joystick control valve.
(a) If hydraulic oil pressure is at 1700
TR01815
to 1800 psi (11721 to 12411 kPa),
notify Direct Support of faulty
extend cylinder.
(b) If hydraulic oil pressure is not at
1700 to 1800 psi (11721 to 12411
kPa), shut down engine (TM 10-
3930-673-10) and replace
hydraulic joystick control valve.
TR01264
Change 1
2-821

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