TM 5-5420-228-24
DETAILED TROUBLESHOOTING PROCEDURE
Symptom-1.1
LAUNCHER OPERATION HYDRAULICS
(Continued)
5
Check overhead dual counterbalance valve for
pressure setting between 3550 to 3650 psi.
First Technician (Operator's Station)
Ensure ball valve is in "TRAVEL" position.
Stop engine.
Both Technicians (Outside Vehicle)
Have bridge removed from launcher TM 5-
5420-203-14
Second Technician (Operator's Station)
Start engine.
Move ball valve to "LAUNCH" position.
Set engine speed at 1800 rpm.
Raise tongue cylinder control lever until tongue
cylinder is fully extended.
Move ball valve to "TRAVEL" position.
Stop engine.
Depress overhead cylinder control lever and
allow tongue to lower slowly to ground.
Both Technicians (Overhead Cylinder)
Remove overhead cylinder armor (page 3-
First Technician (Overhead Cylinder)
If STE/ICE is available, proceed to test No. 51
(page 2-58.1) to test overhead dual
counterbalance valve T2 quick disconnect.
If STE/ICE is not available, connect adapter
hose to gage and adapter to overhead dual
counterbalance valve T2 quick disconnect
fitting.
Second Technician (Operator's Station)
Start engine.
Move ball valve to "LAUNCH" position.
Set engine speed at 1800 rpm.
Raise overhead cylinder control lever for five
minutes.
First Technician (Overhead Cylinder)
Check if pressure gage or STE/ICE is between
3550 to 3650 psi.
Is pressure between 3550 to 3650 psi.
6
Go to step 10.
NO
YES
Change 3
2-68.3
