TM5-3810-305-10
Lower Load with Winch
1.
2.
3.
4,
5.
6.
7.
NOTE
If there is no load on hook
proceed to Retract Boom.
Bring hand pump pressure hose up to winch
and remove smallest cap on the connector tee.
Disconnect the brake hose from the tee in the
lowering port on the winch motor.
Entry of air into lowering port
will cause winch motor to cavi-
tate. The winch motor lowering
port tee must be capped to pre-
vent load from free falling when
hand pump pressure is applied.
Failure to follow this procedure
could cause DEATH or serious
injury.
Install cap on winch motor lowering port tee.
Connect connector tee to winch brake hose.
When working the hand pump,
clear all personnel from the area.
Failure to follow this procedure
could cause DEATH or serious
injury.
Close pressure release lever on pump. Pump
slowly until winch brake is released. The
load will lower slowly to the ground.
With the load safely down, open pressure
release lever on hand pump.
Disconnect brake hose from connector tee and
reattach to lowering port tee. Install cap on
connector tee.
8. Using a wrench on the swing box, rotate up-
perstructure back to the travel position.
Retract Boom
1.
2.
3.
4.
5.
Never disconnect hydraulic lines
or fittings before venting pres-
sure. Turn dipstick cap 1/4 turn
to safety notch to relieve pres-
sure. Failure to follow this
procedure could cause SERIOUS
INJURY.
Turn dipstick 1/4 turn to safety notch to
relieve pressure.
Locate counterbalance valve on top of boom
extend cylinder at base of boom.
Loosen jam nut on counterbalance valve ex-
tending up from valve block and turn the
adjusting screw in until it bottoms (Figure 4-
54). Keep track of number of turns required
to bottom out screw.
Figure 4-54. Holding Valve (Adjusting Screw)
Turn ignition switch ON and pull back on
boom telescope lever until boom is fully re-
tracted.
NOTE
If boom retracts, proceed to step
12.
Remove hose from retract port adapter on
control valve extend/retract section (first
section from the left side) (refer to Figure 4-
53).
4-58
