TM 5-5420-228-24
DETAILED TROUBLESHOOTING PROCEDURE
LAUNCHER OPERATION HYDRAULICS
Symptom-2.1
(Continued)
HEU BRIDGE DOES NOT LOWER SMOOTHLY FROM VERTICAL POSITION.
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 tongue dual counterbalance valve for
pressure setting between 650 to 750 psi.
First Technician (Operator's Station)
Shut engine off.
Move ball valve to "TRAVEL" position.
Cycle bridge launching control levers.
Both Technicians (Outside Vehicle)
Remove tongue cylinder armor (page 3-232).
Second Technician (Launcher Tongue)
If STE/ICE is available, proceed to test No. 51
TONGUE
(page 2-58.1) to test tongue dual
CYLINDER
counterbalance valve T1 quick disconnect
DUAL COUNTER
fitting.
BALANCE VALVES
If STE/ICE is not available, connect adapter
UNDER COVER
hose to gage and adapter to tongue dual
counterbalance valve T1 quick disconnect
fitting.
First Technician (Operator's Station)
Start engine.
Move ball valve to "LAUNCH" position.
Set engine speed at 1800 rpm.
Raise tongue cylinder control lever.
Second Technician (Launcher Tongue)
Check if pressure gage or STE/ICE is between
650 to 750 psi.
Is pressure between 650 to 750 psi?
2
Replace cartridge (C1) in tongue
dual counterbalance valve (page
NO
YES
