TM-5-5420-228-24

LAUNCHER HYDRAULICS SYSTEM M48A5/M60A1 TANK CHASSIS, TRANSPORTING: FOR BRIDGE, ARMORED-VEHICLE-LAUNCHED; SCISSORING TYPE, CLASS 60

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT; MAINTENANCE MANUAL

AUGUST 1985

TM-5-5420-228-24 - Page 156 of 750

Change 3

2-90.3/(2-90.4 blank)

TM 5-5420-228-24

Symptom-5.1

First Technician (Operator's Station)

•

Shut engine OFF.

•

Move ball valve to “TRAVEL” position.

•

Cycle bridge launching control levers.

Second Technician (Launcher Tongue)

•

If STE/ICE is available, proceed to test No. 51

(page 2-58.1) to test tongue dual

counterbalance valve T2 quick disconnect

fitting.

•

If STE/ICE is not available, connect adapter

hose to gage and adapter to tongue dual

counterbalance valve T2 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

3550 to 3650 psi.

Check tongue dual counterbalance valve for

pressure setting of between 3550 to 3650 psi.

Is pressure between 3550 to 3650 psi?

5

•

Replace cartridge (C2) in

tongue dual counterbalance

valve (page 3-204.64).

•

If still cannot be brought

within tolerance, notify

support maintenance of

defective valve bank.

•

Remove pressure gage

assembly from T2.

•

Replace tongue cylinder.

6

7

NO

YES

DETAILED TROUBLESHOOTING PROCEDURE

LAUNCHER OPERATION – HYDRAULICS

(Continued)