Loosen nut (4) on check valve (5).
Turn screw clockwise to increase
pressure and counterclockwise to
Turn screw (6) fully clockwise to open
check valve (5).
Hydraulic system is under high pres-
sure. Follow system safety proce-
dures to prevent injury (TM 9-2350-
238-20-2). Wipe up spilled hydraulic
Turn on hydraulic system. Refer to
Do not allow pressure to go over
2350 psi (16,203 kPa). Failure to
follow instructions may result in
damage to equipment.
Watching oil pressure tester on boom
cylinder pressure relief valve (2), pull
BOOM cylinder control handle (7) slowly
to RAISE. If pressure exceeds 2350 psi
(16,203 kPa) while raising boom, turn
screw (6) counterclockwise to decrease
Hold BOOM cylinder control handle (7) in
full RAISE position and read oil pressure