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 286 of 750

TM 5-5420-228-24

SCISSOR CYLINDER RELIEF VALVE (RV8) ADJUSTMENT (Sheet 1 of 1)

TOOLS: 3/16 in. socket head screw key

1/4 in. socket head screw key

-

9/16 in. open end wrench

SPECIAL TOOLS: Gage, pressure (item

PERSONNEL:

Two

REFERENCE:

TM 5-5420-202-10

3, sec III, app B)

PR

If

51

.E

S

(page -2-47)

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

End

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

Manually install pressure gage in opening left by removal of plug

Engage hydraulic pump (TM 5-5420-202-10).

Set engine speed at 1800 rpm.

Slowly push up overhead cylinder control lever until outrigger contacts

ground’

and

hold in that position.

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 3400 ± 50

psi (23443 ± 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 3/1 6 inch 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 3400 ± 50 psi (23443

+ 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.

of Task

TA251487

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