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 281 of 750
TM 5-5420-228-24
TONGUE CYLINDER RELIEF VALVE (RV4) ADJUSTMENT (Sheet 1 of 1)
TOOLS: 3/1 6 in. socket head screw key
1/4 in. socket head screw key
9/1 6 in. open end wrench
SPECIAL TOOLS: Adapter ell (item 1, sec III, app B)
Adapter straight (item 2, sec III, app B)
Gage, pressure (item 3, sec III, app B)
Hose assembly (item 4, sec III, app B)
PERSONNEL:
Two
REFERENCE:
TM 5-5420-202-10
PRELIMINARY PROCEDURES:
Remove tongue cylinder armor (page 3-232)
Relieve hydraulic pressure (page 3-71)
NOTE
If STE/lCE is available,
Test 51 (page 2-47).
ADJUSTMENT:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Using 1/4
Manually
plug (A).
go to
s
inch screw key, re
install gage, adapt
Engage hydraulic pump (TM 5-5420-202-10).
Set engine speed at 1800 rpm.
Slowly push down tongue cylinder control lever all the way until t
(B) is in fully retracted position.
Have second technician observe pressure gage reading.
Return tongue cylinder control lever to neutral position.
Using wrench, remove adjusting screw cap (C).
NOTE
Correct pressure is 3600 ± 50 psi (24822 ± 340 kPa).
To adjust relief valve pressure, hold adjusting
screw
(D) with 3/16 inch screw key
and use wrench to loosen jamnut (E). Using 3/16 inch screw key, turn adjusting screw
(D) 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 (D) with 3/16 inch screw key, use wrench to tighten jamnut
(E).
Install adjusting screw cap (C) using wrench.
Remove gage, adapters, and hose assembly.
Using 1/4 inch screw key, install plug (A) and
Install tongue cylinder armor (page 3-233).
tighten.
TA251482
End of Task
3-84
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