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 284 of 750

TM 5-5420-228-24

LOCKING RELIEF VALVE (RV6) ADJUSTMENT (Sheet 1 of 1)

TOOLS: 1/4 in. socket head screw key

3/16 in. socket head screw key

9/16 in. open end wrench

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

PERSONNEL:

Two

REFERENCE:

TM 5-5420-202-10

PRELIMINARY PROCEDURE:

Relieve hydraulic pressure (page 3-71)

NOTE

If STE/lCE is available, go to STE/lCE Test

51 (page 2-47).

ADJUSTMENT:

1.

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

2.

Manually install pressure gage in opening left by

removal

3.

4*

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

End

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

Set engine speed at 1800 rpm.

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

Have second technician observe pressure gage reading.

Return locking cylinder control lever to neutral position.

Remove adjusting screw cap (B) using wrench.

NOTE

Correct pressure is 500 ± 50 psi (3447 ± 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 3/16 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 500 + 50 psi (3447 + 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

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