SCISSOR CYLINDER RELIEF VALVE (RV8) 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 TOOLS: Gage, pressure (item 3, sec III, app B)
Using 1/4 inch screw key, remove plug (A).
Manually install pressure gage in opening left by removal of plug
Engage hydraulic pump (TM 5-5420-202-10).
Set engine speed at 1800 rpm.
Slowly push up overhead cylinder control lever until outrigger contacts ground' and
hold in that position.
Have second technician observe pressure gage reading.
Return overhead cylinder control lever to neutral position.
Remove adjusting screw cap (B) using wrench.
Correct pressure is 3400 ± 50 psi (23443 ± 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 3/1 6 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 3400 ± 50 psi (23443
-- 340 kPa).
Holding adjusting screw (C) with 3/16 inch screw key, use wrench to tighten jamnut
install adjusting screw cap (B) using wrench.
Remove pressure gage.
Using 1/4 inch screw key, install plug (A) and tighten.
End of Task