5-4
Published 9-04-2014, Control # 422-08
HOIST AND COUNTERWEIGHT RT765E-2 SERVICE MANUAL
Removal
1. Remove all cable from the hoist drum.
2. Tag and disconnect the hydraulic lines to the hoist. Cap
or plug all lines and openings.
3. Tag and disconnect the electrical wires to the hoist
rotation indicator sensor.
4. Tag and disconnect the electrical wires to the hoist
control valve.
5. Remove the hoist mounting nuts, capscrews, washers,
and shims (if shims are used, mark their location).
NOTE: The hoist assembly, less the cable, weighs
approximately 1400 lb (635 kg).
6. Using an adequate lifting device, remove the hoist from
the crane.
Installation
1. Ensure the mounting plate and hoist pads are clean and
free from debris and the hoist has not been damaged
during handling.
2. With the hoist supported by a suitable lifting device,
position the hoist on the mount.
3. Check the hoist to boom alignment according to the
Hoist to Boom Alignment, page 5-8 procedure.
4. Place a level between the boom pivot shaft bushings.
5. Place a level across the top of the hoist drum and
determine if the hoist is sitting in the same plane in
relation to the level positioned between the boom pivot
shaft bushings.
6. With the hoist level, check to determine if all the hoist
mounting pads are in contact with the mounting plate by
rocking the hoist.
7. Keeping the hoist level, use a feeler gauge to determine
the amount of gap existing between the pads and the
mounting plate.
8. Add shims to satisfy any existing gaps. Altering the shim
thickness to fit a tapering gap is acceptable. Install the
capscrews, washers, and nuts; refer to Fasteners and
Torque Values, page 1-16 for proper torque value.
9. Remove the lifting device from the hoist.
10. Connect the hydraulic lines to the hoist ensuring the
proper lines are connected to the correct ports as
marked during removal.
11. Connect the electrical wires to the hoist control valve as
marked during removal.
12. Connect the electrical wires to the hoist rotation indicator
sensor as tagged during removal.
13. Install the cable, following the procedures outlined under
Installing Cable on the Hoist, in the Operator’s Manual.
Functional Check
1. Attach a test weight to the hook and raise and lower the
load several times.
2. Check the hoist for smooth operation of the hoist motor
and brake system.
3. Ensure the hydraulic connections are secure and free
from leaks.
Fluid Level
NOTE: Failure to align the fill/drain plug (1) with the upper
access hole (2) as shown in Figure 5-3 prior to
checking the oil level will result in an inaccurate
reading.
1. Rotate the hoist drum until the fill/drain plug (1) appears
in the upper access hole (2) shown in Figure 5-3.
This will ensure that the planetary gears are in proper
alignment and will permit an accurate reading of the oil
level in the hoist.
2. Allow the hoist to stand idle for 20 minutes before
checking the oil.
3. The oil level should be visible in the sight glass (3).
Item Description
1 Hoist
2 Capscrew
3Shim
4 Washer
5Nut
6 Turntable
7 Capscrew
8 Counterweight Plate
9Shim
Reference Only
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