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

  TB-9-3950-253-13-P - Page 208 of 704

TB 9-3950-253-13&P
Change 1
0019-28
0019
HYDRAULIC SYSTEM - CONTINUED
NO RETRIEVE OR STOW FUNCTION – CONTINUED.
NOTE
•
P8 has 24V only when STOW or RETRIEVE button on control panel is activated.
•
When ignition switch is turned on after battery disconnect switch has been turned off and
back on, error codes 1 and 24 may alternately display for one minute. This error code
indicates that temporary settings were lost while battery disconnect switch was off, and is
consistent with normal operation.
Step 5.
Check for 24V supply.
a.
With engine on, press retrieve button on Control Panel and check for 24V supply on P8 pin
1 and 2 in Space 4000 ST Box.
1.
If no 24V, replace Space 4000 ST box.
2.
If 24V, proceed with this sequence.
b.
Set ignition switch and battery disconnect switch to OFF position (PLS: TM 9-2320-364-
14&P, HEMTT: TM 9-2320-326-14&P).
c.
Disconnect unstow harness from solenoid valve (WP 0026).
d.
Set ignition switch and battery disconnect switch to ON position.
e.
With engine on, press retrieve button on Control Panel and check for 24V supply between
pins 1 and 2 at solenoid end of unstow harness.
1. If no 24V, replace unstow harness (WP 0029).
2. If 24V, set ignition and battery disconnect switch to OFF position, reconnect unstow har-
ness (WP 0026) and process to next step.
Step 6.
Set battery disconnect switch to ON position and start engine (PLS: TM 9-2320-364-14&P,
HEMTT TM 9-2320-326-14&P).
Step 7.
While pressing unstow button on control panel, press and hold unstow manual over-ride button
at top of solenoid valve.
a.
If stowage guide moves, replace solenoid valve (WP 0026).
b.
If stowage guide does not move, set ignition and battery disconnect switch to OFF position
and proceed to next step.
Step 8.
Disconnect stow harness from solenoid valve (WP 0026).
a.
With engine on, press stow button on Control Panel and check for 24V supply between
pins 1 and 2 at valve actuator end of stow harness.
1.
If no 24V, replace stow harness (WP 0030).
2.
If 24V, set ignition and battery disconnect switch to OFF position, reconnect stow har-
ness (WP 0026) and proceed to next step.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
0.


Back to Top