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 278 of 750

OVERHEAD CYLINDER RELIEF VALVE

TOOLS: 1/4 in. socket head screw key

3/16 in. socket head screw key

9/16 in. open end wrench

TM 5-5420-228-24

(RV3)

ADJUSTMENT (Sheet 1 of 1)

SPECIAL TOOL: Gage, pressure (item 3, sec III, app B)

PERSONNEL:

Two

REFERENCE:

TM 5-5420-202-10

PRELIMINARY PROCEDURES:

Remove overhead cylinder armor (page 3-223)

Relieve hydraulic pressure (page 3-71)

(page 2-47).

ADJUSTMENT:

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Using 1/4 inch screw key, remove plug (A).

Manually install pressure gage in opening

Engage hydraulic pump (TM 5-5420-202-1).

Set engine speed at 1800 rpm.

left by re

Slowly push down overhead cylinder control lever all the way and hold in that position.

When overhead cylinder is fully retracted, have second technician observe pressure

gage reading.

Return overhead cylinder control lever to neutral position.

Remove adjusting screw cap (B) using wrench.

NOTE

Correct pressure is 3600 ± 50 psi

(24822 ± 340

kPa).

To adjust relief valve pressure, hold adjusting screw (C) with 3/16 inch screw key and

use wrench to loosen jamnut (D). Using screw key, turn adjusting screw (C) clockwise

to increase pressure or counterclockwise to decrease pressure.

Repeat steps 3

through 9 until pressure gage shows reading of 3600 ± 50 Psi (24822±

340 kPa).

Holding adjusting screw (C) with 3/16 inch screw key, use wrench to tighten jamnut

(D).

Install adjusting screw cap (B) using wrench.

Remove pressure gage.

Using 1/4 inch screw key, install plug (A) and tighten.

Install overhead cylinder armor (page 3-224).

TA25179

3-81

End of Task