TB-9-3950-253-13-P
PALLETIZED LOAD SYSTEM TRUCK, M1075 and M1075A1 (PLS) AND HEAVY EXPANDED MOBILITY TACTICAL TRUCK, M1120, M1120A2, AND M1120A4 (HEMTT), ENHANCED CONTAINER HANDLING UNIT (E-CHU)
TECHNICAL BULLETIN; OPERATOR AND FIELD MAINTENANCE, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2009
TB-9-3950-253-13-P - Page 209 of 704
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Change 1
TB 9-3950-253-13&P
0019
HYDRAULIC SYSTEM - CONTINUED
NO RETRIEVE OR STOW FUNCTION – CONTINUED.
WARNING
•
During these procedures, the operator will be required to climb on and around vehicle. Be
sure to wear suitable footwear and that no surfaces are slippery. Wear suitable gloves and
hard hat.
•
Hydraulic fluid under pressure can penetrate the skin and cause injury, blindness, or
death. Pressure may build up in a hydraulic system. DO NOT perform any hydraulic
system service without first shutting down the engine to relieve system pressure.
•
Failure to follow these warnings may result in death or serious injury to personnel.
Step 9.
Remove pressure hose from input side of manifold, install T-fitting between hose and manifold,
and connect pressure gauge to T-fitting.
Step 10.
With engine on, press unstow button on Control Panel and check for hydraulic pressure.
a.
If hydraulic pressure is <100 psi (689 kPa) turn off engine and replace pressure hose (WP
0044).
b.
If hydraulic pressure is >100 psi (689 kPa), turn off engine, remove pressure gauge from T-
fitting, T-fitting from hose and manifold, install pressure hose on manifold and proceed to
next step.
Step 11.
Remove pressure hose from output side of manifold, install T-fitting between hose and manifold
and connect pressure gauge to T-fitting.
Step 12.
With engine on, press unstow button on Control Panel and check for hydraulic pressure.
a.
If hydraulic pressure is <100 psi (689 kPa) turn off engine and replace manifold (WP 0026).
b.
If hydraulic pressure is >100 psi (689 kPa), turn off engine, remove pressure gauge from T-
fitting, T-fitting from hose and manifold, install pressure hose on output side of manifold and
proceed to next step.
Step 13.
Remove pressure hose from lower fitting on cylinder, install T-fitting between hose and cylinder
and connect pressure gauge to T-fitting.
Step 14.
With engine on, press unstow button on Control Panel and check for hydraulic pressure.
a.
If hydraulic pressure is <100 psi (689 kPa) turn off engine and replace pressure hose from
manifold to cylinder (WP 0044).
b.
If hydraulic pressure is >100 psi (689 kPa), turn off engine, remove pressure gauge from T-
fitting, T-fitting from hose and cylinder, install pressure hose on cylinder and proceed to
next step.
Step 15.
Remove relief hose from upper fitting on cylinder, install T-fitting between hose and cylinder and
connect pressure gauge to T-fitting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
0.
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