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 122 of 750

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.

NOTE

HEU BRIDGE DOES NOT LOWER SMOOTHLY FROM VERTICAL POSITION.

First Technician (Operator's Station)

x

Shut engine off.

x

Move ball valve to “TRAVEL” position.

x

Cycle bridge launching control levers.

Both Technicians (Outside Vehicle)

x

Remove tongue cylinder armor (page 3-232).

Second Technician (Launcher Tongue)

x

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

(page 2-58.1) to test tongue dual

counterbalance valve T1 quick disconnect

fitting.

x

If STE/ICE is not available, connect adapter

hose to gage and adapter to tongue dual

counterbalance valve T1 quick disconnect

fitting.

First Technician (Operator's Station)

x

Start engine.

x

Move ball valve to “LAUNCH” position.

x

Set engine speed at 1800 rpm.

x

Raise tongue cylinder control lever.

Second Technician (Launcher Tongue)

x

Check if pressure gage or STE/ICE is between

650 to 750 psi.

Check tongue dual counterbalance valve for

pressure setting between 650 to 750 psi.

1

Change 3

2-74.1

TM 5-5420-228-24

DETAILED TROUBLESHOOTING PROCEDURE

LAUNCHER OPERATION – HYDRAULICS

(Continued)

Symptom-2.1

TONGUE

CYLINDER

DUAL COUNTER

BALANCE VALVES

UNDER

COVER

NO

YES

x

Replace cartridge (C1) in tongue

dual counterbalance valve (page

3-204.64).

2

Is pressure between 650 to 750 psi?