TM 9-2350-256-34
0068 00
3.
Set engine speed at 16001800 rpm.
CAUTION
Do not exceed 1700 psi (11,722 kPa) relief pressure.
NOTE
BOOM COMBINATION CONTROL VALVE ADJUSTMENT--Perform steps 4 thru 6 to adjust the
boom combination control valve to achieve live boom capability.
NOTE
This adjustment must be performed with the hydraulic reservoir oil temperature at 100 F130 F
(38 C54 C).
4.
If using load cell or weights, activate boom valve to RETRACT position and use adjusting screw (22) on boom combination
control valve (21) to achieve a pull of 50,00055,000 lb (22,68024,948 kg). Turning in a clockwise direction will increase
pressure.
If blocking the boom, place boom operating lever in RETRACT position and boom safety control lever in
STOW position. Adjust boom combination control valve rear relief (toward rear of vehicle) to 1600 psi (11,032 kPa) by
turning adjusting screw (22). Turning in a clockwise direction will increase pressure.
NOTE
Pressure must be between 1550 and 1650 psi (10,687 and 11,377 kPa). Do not exceed 1650 psi (11,377
kPa).
5.
Verify pressure with locking nut set in locked position and record new setting in Vehicle Log Book.
6.
Disconnect pressure gage. Remove load cell or weights. Remove blocking.
NOTE
If adjustment procedure was done using load cell or calibrated weights, no further load test is required.
If adjustment was made with boom blocked, verify capabilities with the load test that follows.
0068 00-8
