TM 5-5420-227-24
OVERHEAD CYLINDER RELIEF VALVE (RV9) 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 TOOL: Gage, pressure (item 3, sec III, app B)
PERSONNEL:
Two
REFERENCE:
PRELIMINARY PROCEDURES:
Remove overhead cylinder armor (page 3-217)
Relieve hydraulic pressure (page 3-65)
If STE/ICE is available, go to STE/ICE Test 51
ADJUSTMENT:
1. Using 1/4 inch screw key, remove plug (A).
Manually install pressure gage in opening left by plug (A) removal.
2.
Engage hydraulic pump (TM 5-5420-226-10).
3.
Set engine speed at 1800 rpm.
4.
Slowly push up overhead cylinder control lever all the way and hold in that position.
5.
Have second technician observe pressure gage reading.
6.
Return overhead cylinder control lever to neutral position.
7.
Remove adjusting screw cap (B) using wrench.
8.
NOTE
Correct pressure is 3600 50 psi (246223 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 3600 50 psi (24822 +
10.
--
340 kPa).
Holding adjusting screw (C) with 3/1 6 inch screw key, use wrench to tighten jamnut
11.
(D).
Remove pressure gage.
12.
13.
Using 1/4 inch screw key, install plug (A).
14.
Install adjusting screw cap (B) using wrench.
15.
Install overhead cylinder armor (page 3-218).
End of Task
TA170302
3-76