Manitowoc Grove GRT9165, Service Manual

Page: 159 / 302

5-9
GRT9165 SERVICE MANUAL HOIST AND COUNTERWEIGHT
5
Published 10-01-2020 Control # 699-00 GROVE
Hoist Rotation Indicator
The hoist rotation indicator system provides the operator
with a touch indication of the hoist drum rotation so he or she
knows if and at what speed the hoist drum is rotating. The
system also displays symbols on the rated capacity limiter
(RCL) display and crane control operation (CCS) display
indicating which hoist is operating and in what direction it is
rotating (hoist up or hoist down).
The hoist rotation indicator system uses a thumb thumper
solenoid to provide a physical indication to the operator of
hoist operation. Actuation of the thumb thumper is controlled
by the CAN bus modules from input supplied by the hoist
drum encoder. The pulsing thumb thumper solenoid is
located in the main and auxiliary hoist joystick handles and
provides feedback proportional to the hoist line speed by
pulsing the rubber button on top of the hoist joystick. The
thumb thumper solenoid will cease operation at high line
speeds to prevent damage to the solenoid.
3rd Wrap Indicator
The 3rd wrap indicator system uses the main and auxiliary
hoist encoders to indicate when there are three wraps of
cable remaining on the respective hoist. When three wraps
of cable are reached on the main or auxiliary hoist, the crane
control system will sound a buzzer in the cab, cut-out the
hoist down function, and display the 3rd wrap symbol on the
ODM display to indicate that three wraps of cable remain on
the respective hoist. The encoder must be properly adjusted
for this system to function properly. Refer to
Adjusting 3rd
Wrap Switch , page 5-9.
Maintenance
General
Proper circuit operation can be checked for each individual
electrical component. If a malfunction occurs within the
system, repairs should be limited to finding and replacing the
faulty component(s). To determine which component is at
fault, refer to the troubleshooting section of your CAN bus
CD.
Adjusting 3rd Wrap Switch
1. Install hoist rope on the hoist.
2. Reeve hook block with six or more parts of line from
hoist to be adjusted.
3. Raise and extend boom as necessary.
4. Lower hook block until three wraps of rope remain on
hoist drum.
NOTE: If using synthetic rope, lower hook block until three
wraps of line remain on hoist drum.
5. Remove four screws and cover from switch (1,
Figure 5-2).
6. Rotate adjustment screw (2) until switch activates.
Service software may be used to monitor an indicator
light on the appropriate display.
7. Raise hook block until there are ten rope wraps on hoist
drum.
8. Lower hook block to verify lower limit switch actuates
with three rope wraps on hoist drum.
NOTE: If using synthetic rope, lower hook block to verify
lower limit switch actuates with three rope wraps on
hoist drum.
9. Correct setting of switch if necessary.
10. Install cover and secure with four screws.
11. Repeat for auxiliary hoist.
DANGER
Disconnect the batteries before performing any
maintenance on this system. Serious burns may result
from accidental shorting or grounding of live circuits.
FIGURE 5-2
10167
1