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5-8
Published 10-01-2020 Control # 699-00
HOIST AND COUNTERWEIGHT
GRT9165 SERVICE MANUAL
800+ ppm
Unacceptable. Remove hoist from service and perform tear-
down inspection to determine source of contamination.
NOTE:
Iron contaminant levels will be on high side of
“Normal” during initial break-in.
Equally important as level of contamination is a change in
level of contamination. An effective oil analysis program
should provide the technician with a view of the progression
of wear or a trend. If a sample shows a sudden rise in
contaminant level, action should be taken to determine what
has changed.
NOTE:
Oil analysis alone cannot detect nor warn against a
fatigue failure.
Brake Test Procedure
These planetary hoists have a spring applied, hydraulically
released, multiple disc brake inside the hoist housing. This
brake holds a suspended load when the directional control
valve is in neutral, or when hydraulic power is lost. A load
cannot be lifted or lowered, however, without applying
hydraulic pressure to the release port and releasing the
brake.
(Test to be performed with no load on the hoist)
Remove and cap or plug the brake release line from fitting in
the hoist brake release port.
With hydraulic power unit running, move directional control
valve handle slowly to the full open, lowering position.
Increase the engine speed, if necessary, to bring system
pressure up to the relief valve setting. The hoist drum should
remain stationary.
If the hoist drum rotates, the hoist should be disassembled
and the brake components should be examined for wear. In
addition, the brake springs should be measured for the
correct free length in those hoist using helical compression
springs.
Replace any parts showing excessive wear and any spring
whose length is shorter than the minimum shown in the
applicable hoist Service Manual.
Reassemble the brake and hoist and repeat the above steps.
When testing is complete, reattach the brake release line to
the brake release port.
HOIST MOTOR, MOTOR CONTROL VALVE,
AND BRAKE
Description
Each hoist has a hydraulic motor, a motor control valve, a
brake cylinder, and a brake clutch which controls motion of
the hoist’s drum. These parts mount on or in the gearbox.
The hydraulic motor connects to the hoist’s brake, which in
turn connects to the gear train of the hoist. The entire hoist
assembly must be removed from the crane to service the
assembly.
Removal
1.
Power-wash the hoist on the motor side to wash away
potential contaminants from the drive components of the
hoist.
2.
Drain the oil from the hoist gearbox. Refer to the hoist
draining procedures in
After oil is drained, reinstall the plug or hose at bottom of
sight glass.
3.
Tag and disconnect the hydraulic lines from the motor
and the motor control valve. Cap or plug all lines and
openings.
4.
Remove the bolts and washers to free the motor and
motor control valve from the motor adapter plate.
Remove the motor and motor control valve as a unit.
Discard the O-ring. Remove the motor adapter plate and
o-ring from the gearbox. Discard the o-ring.
5.
Cover the gearbox opening in the brake cylinder to
protect drive components inside the hoist drum.
6.
If disassembling the brake, remove the hoist assembly
from the crane. Brake disassembly requires special
tools and is more easily done when the hoist assembly
removed from the crane.
Installation
1.
Uncover the motor opening in the gearbox. Verify these
parts are clean.
2.
Install a replacement O-ring on the motor’s pilot after
lubricating it with gear oil or petroleum jelly.
3.
Engage the motor shaft to the input shaft of the gearbox.
Secure the motor and brake valve to the gearbox with
bolts and washers. Torque bolts to 40 N-m (29.5 lb-ft).
4.
Connect the hydraulic lines to the motor and brake valve
as tagged during removal.
5.
Fill the gearbox with oil. Refer to the hoist filling
procedures in
HOIST ROTATION AND 3RD WRAP
INDICATOR SYSTEM
Description
The main and auxiliary hoists are each equipped with an
encoder (Figure 5-2) that is part of the hoist rotation and 3rd
wrap indicator systems. The encoder is mounted to the end
of each hoist and senses the rotation of the drum.
Содержание Grove GRT9165
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