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 283 of 750

TM 5-5420-228-24

SEQUENCE RELIEF VALVE (RV5) ADJUSTMENT (Sheet 1 of 1)

TOOLS: 3/16 in. socket head screw key

1/4 in. socket head screw key

9/16 in.

SPECIAL TOOL:

PERSONNEL:

REFERENCE:

open end wrench

Gage, pressure (item 3, sec III, app B)

Two

TM 5-5420-202-10

PRELIMINARY PROCEDURE:

Relieve hydraulic pressusre (page 3-71)

NOTE

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

51 (page 2-47).

ADJUSTMENT:

Using 1/4 inch screw key, remove plug

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

Manually install pressure gage in opening left by removal

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

Set engine speed at 1800 rpm.

Slowly push up tongue cylinder control lever all the way to extend and hold in that position.

Have second technician observe pressure gage reading.

Return tongue cylinder control lever to neutral position.

Remove adjusting screw cap (B) using wrench.

NOTE

Correct pressure is 700 ± 50 psi (4826 ± 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 700 ± 50 psi (4826 ±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.

End of Task

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