TM 5-5420-280-23&P
TROUBLESHOOTING PROCEDURES
RAPIDLY EMPLACED BRIDGE (REB)
NSN 5420-01-481-3959 P/N 12480471
HYDRAULIC SYSTEM TROUBLESHOOTING
NOTE
Refer to the general instructions in Introduction to
Troubleshooting, WP 0004 00, prior to performing hydraulic system
troubleshooting.
Refer to Pallet Hydraulic System Schematic (WP 0121 00), Winch
Control Block Hydraulic Schematic (WP 0123 00), Pallet Electrical
System Schematic (WP 0122 00), and Winch Electronic Box
Electrical Schematic (WP 0124 00) when performing
troubleshooting tasks.
Hydraulic System Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. HYDRAULIC SYSTEM WILL NOT OPERATE USING LAUNCH POWER UNIT (LPU)
Step 1. Check that auxiliary engine is operating. Refer to TM 5-5420-280-10.
Start engine and set to operating speed. Refer to TM 5-5420-280-10.
Step 2. Check that hydraulic hose quick-disconnectors are connected to bridge pallet connections.
Refer to TM 5-5420-280-10.
Connect hydraulic hose quick-disconnectors to bridge pallet connectors. Refer to
TM 5-5420-280-10.
Step 3. Check for low oil level in pallet hydraulic reservoir.
Fill hydraulic reservoir to proper oil level. Refer to WP 0016 00.
Step 4. Check that bypass valve on auxiliary engine pump is in closed position.
Close bypass valve on auxiliary engine pump. Refer to TM 5-5420-280-10.
Step 5. Check for damaged hydraulic pump or drive coupling.
a. Replace drive coupling if damaged. Refer to WP 0104 00.
b. Replace hydraulic pump if damaged. Refer to WP 0104 00.
NOTE
KY1 is main pressure hydraulic control valve and must operate
with all other control valves to perform an operation.
Step 6. Check for loose electrical connector or damaged KY1 hydraulic control valve on control
manifold.
a. Manually engage KY1 hydraulic control valve by pressing down on button on top of
solenoid, if system operates. (Check Electrical System Troubleshooting WP 0008 00.)
b. Tighten or connect electrical connector on KY1 hydraulic control valve. Refer to
c. Replace damaged KY1 hydraulic control valve. Refer to WP 0075 00.
