TM 5-5420-228-24
DETAILED TROUBLESHOOTING PROCEDURE
Symptom-1.1
LAUNCHER OPERATION HYDRAULICS
HEU BRIDGE DOES NOT LIFT OFF BRIDGE SEAT.
NOTE
This procedure is to be performed by
two persons. The lead person is referred
to as the first technician and shall direct
the activity of the second person called
the second technician.
1
Check shouldered drive shaft for rotation at
hydraulic assembly.
Second Technician (Dual Counterbalance Valve)
Move ball valve to "TRAVEL" position.
Remove pump cover plate (page 3-65).
Start engine.
Visually check shouldered drive shaft for
rotation.
Is shouldered drive shaft rotating?
NO
YES
2
Check universal joints or power takeoff shaft for
damage.
Are universal joints or power takeoff shaft damaged?
NO
YES
Replace defective
Notify support
universal joint(s) or power
maintenance of defective
takeoff shaft (page 3-62).
power takeoff assembly.
