Manitowoc MLC150-1, Service Maintenance Manual

Page: 133 / 206

Manitowoc
Published 03-21-2021, Control # 264-01
5-35
MLC150-1 SERVICE/MAINTENANCE MANUAL HOISTS
5
PRESSURE ROLLERS
Optional pressure rollers ( Figure 5-22 ) are available to assist
in maintaining proper wire rope spooling on the Drums 1 and
2 during dynamic operations, like clamshell.
The pressure rollers provide the following forces:
Table 5-1. Pressure Roller Force
Removing Pressure Roller Assembly
1. Pre-load the pressure roller (2 or 5) by pulling the roller
rearward as far as it will go and securely holding it in
place.
2. Install the M10 socket head screws (4) in the fours holes
indicated.
This step will hold the pressure roller in the pre-loaded
position.
3. Support the pressure roller assembly so it cannot fall
and remove the mounting screws (3 or 6).
4. Remove the pressure roller assembly from the drum and
store it for future use.
5. Store the mounting screws and washers with the
pressure roller assembly.
6. Relieve the spring pre-load for storage:
a. Pull back on the pressure roller and hold it securely
in place.
b. Remove the M10 socket head screws (4) and store
them.
c. Slowly release the roller to relieve the pre-load.
Installing Pressure Roller Assembly
1. Make sure there no more than 3 layers of wire rope on
the drum.
2. If necessary, pre-load the pressure roller (2 or 5) by
pulling the roller rearward as far as it will go and securely
holding it in place.
3. Install the M10 socket head screws (4) in the fours holes
indicated.
This step will hold the pressure roller in the pre-loaded
position.
4. Lift the pressure roller assembly (2 or 5) into position at
the rear of the drum.
5. Apply Loctite® 243 to the mounting screw threads.
6. Align the connecting holes and install the mounting
screws (3 or 6).
7. Torque the screws to 83 Nm (60 ft-lb).
8. Pull back on the pressure roller and hold it securely in
place.
9. Remove the M10 socket head screws (4) and store
them.
10. Slowly release the roller until the roller is firmly against
the wire rope on the drum.
CAUTION
Avoid Pressure Roller Damage!
The pressure rollers are designed for use on drums with 1
to 3 layers of wire rope only.
To avoid damage, remove the pressure rollers for
applications requiring more then 3 layers of wire rope.
Layer Force
Without Free Fall
1 45,4 kg (100 lb)
3 79,4 kg (175 lb)
With Free Fall
1 72,6 kg (160 lb)
3 99,8 kg (220 lb)
WARNING
Crush Hazard!
The pressure roller is spring pre-loaded.
During removal and installation, keep all body parts clear
from between the roller and the drum.
The roller will spring into engagement against the drum if
you let go of the roller while the M10 socket head screws
are being installed or removed.
REFERENCE
ONLY