TM 5-5420-227-24
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. open end wrench
SPECIAL TOOL: Gage, pressure (item 3, sec III, app B)
Two
PERSONNEL:
REFERENCE:
PRELIMINARY PROCEDURE:
Relieve hydraulic pressure (page 3-65)
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.
Set engine speed at 1800 rpm.
4.
Slowly push up tongue cylinder control lever all the way to extend and hold in that position.
5.
Have second technician observe pressure gage reading.
6.
Return tongue cylinder control lever to neutral position.
7.
Remove adjusting screw cap (B) using wrench.
8.
NOTE
Correct pressure is 700 50 psi (4626 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.
10.
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
11.
(D).
Remove pressure gage.
12.
Using 1/4 inch screw key, install plug (A).
13.
14.
Install adjusting screw cap (B) using wrench.
TA170306
End of Task
3-80
