Structure, Disassembly And Re-Assembly Of Reduction Gears; Hoisting Unit(Main Reducer) - Mitsubishi Electric UM 5t Instruction Manual

Structure, Disassembly and Re-assembly of Reduction Gears

Hoisting unit(Main reducer)

The simplified 2-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) After disassembly, replace the oil seal with a new one.
Carefully reassemble the oil seal so that the lip cannot be flawed. Completely clean the
sliding area, and then apply a thin coat of grease.
(3) At the completion of reassembly, check that the C-ring, etc. are attached properly. If a part
is distorted or chipped, replace it with a new one.
(4) To reassemble the unit, follow the above disassembly procedure in the reversed order.
Apply grease to the gears first, and then tighten the G-cover. Before tightening the G-cover,
completely degrease the mating faces of the G-cover and the frame, and apply the liquid
packing (Three Bond No. 1208D or No. 1104) to both mating faces.
Lubrication (when reassembling the disassembled unit):
Remove the oil plug (the word "GREASE" is written on the plug), and then supply grease
while referring to the grease quantity shown in the following table. Note that supply of too
much grease may cause leakage of grease.
shown in the following table.
We recommend use of EPNOC Grease AP-O (manufactured by Nippon Oil Co., Ltd.).
Grease quantity (kg)
Capacity (t) 5t,10t
Grease
2.0
G-cover
Sensor case
RRS board
1G
Cover
2G
Frame
4G
Oil seal
3G
－ 28 －
For this reason, be sure to observe the quantity
Rotation sensor