Manitowoc Published 05-26-17, Control # 238-02 5-51
MLC165-1 SERVICE/MAINTENANCE MANUAL HOISTS
FREE FALL BRAKE
Either or both load drums (front and rear) can be equipped
with a free fall brake, Figure 5-34
, on the right end of the
drum gearbox.
The free fall brakes must be serviced by factory trained
personnel. For assistance, contact the Manitowoc Crane
Care Lattice Team.
Removing Free Fall Brake Cover
1. Lower all loads to the ground and park the load drums.
2. Turn off the free fall mode for the drum being serviced.
This will vent system pressure from the brake housing.
3. Stop the engine.
NOTE During the following steps, catch the hydraulic oil
leakage in suitable container.
4. Disconnect the swivel fitting (1) from the supply port in
the cover (2).
5. Disconnect the supply hose (3).
6. Disconnect the case drain hose (4).
7. Mark the cover (2) position with relation to the brake
housing (5) so the cover can be reinstalled in the same
position.
8. Remove two bolts (6), 180° apart — at locations marked
X for example — from the cover (2).
9. Install two user furnished long bolts in place of the two
standard bolts (6) removed in step 8
.
Long bolt specifications:
• M10 x 8,8 threads
• 200 mm long
10. Connect an owner supplied hydraulic hand pump to the
supply port in the cover. The port is ISO 9974 with M16 x
1,5 threads.
11. Apply and hold 60 bar (870 psi) hydraulic pressure to the
port.
12. Remove the remaining bolts (6) from the cover (2).
13. Slowly relieve the hydraulic pressure from the supply
port with the hand pump.
14. The cover can now be removed. Use care. The springs
will fall out as the cover is removed.
Installing Free Fall Brake Cover
Reverse the removal steps to reinstall the cover.
DANGER
Flying Object Hazard!
Brake springs are preloaded. Free fall brake assembly
can fly apart with dangerous force.
To prevent death or serious injury, perform the following
procedure to relieve the spring preload.
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