Hoisting Unit(Sub Reducer) - Mitsubishi Electric UM 5t Instruction Manual

Hoisting unit(Sub reducer)

The sub reduction gear unit is installed in the drum on the side of the hoisting motor. The
simplified 1-step speed reducer with helical gears is adopted for the hoisting unit.
To disassemble this unit, sequentially remove the parts from the outside.
Important points for disassembly and reassembly are described below:
(1) Remove the helical gear while turning the gear along the helix angle. Be careful not to flaw
the gear when you remove it.
(2) If a part is distorted or chipped, replace it with a new one.
(3) To reassemble the unit, follow the above disassembly procedure in the reversed order.
First, stuff the gear box with grease. Then, tighten the L bracket.
Before tightening the L-bracket, completely degrease the mating faces of the Gear -box and the
L-bracket, and apply the liquid packing (Three Bond No. 1208D or No. 1104) to both mating
faces.
Lubrication (when reassembling the disassembled unit):
Stuff the clearance between the wall of the sub reduction gear unit box and the gears with
grease (100 g).
Note that supply of too much grease may cause leakage of grease.
For this reason, be sure to observe the quantity shown in the following table.
We recommend use of Albania EP-2 (manufactured by Showa shell Sekiyu k.k.).
2G
Drum
Frame
Hoisting ｍotor
Motor ｓhaft
L-bracket
Sub gearbox
Inner view of sub reduction gear unit box
- 29 -
Front elevation of
hoisting motor
Stuff here with grease (100 g)