TM 5-5420-227-24
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)
Two
PERSONNEL:
REFERENCE:
Relieve hydraulic pressure (page 3-65)
PRELIMINARY PROCEDURE:
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 plug (A) removal.
Engage hydraulic pump (TM 5-5420-226-10).
3.
4.
Set engine speed at 1800 rpm.
5.
Slowly push down locking cylinder control lever all the way and hold in that position.
Have second technician observe pressure gage reading.
6.
Return locking cylinder control lever to neutral position.
7.
Remove adjusting screw cap (B) using wrench.
8.
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
9.
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
10.
kPa).
11.
Holding adjusting screw (C) with 3/1 6 inch screw key, use wrench to tighten jamnut
(D).
Remove pressure gage.
12.
Using 1/4 inch screw key, install plug (A).
13.
Install adjusting screw cap (B) using wrench.
14.
TA170307
End of Task
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