U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-84
[3] Disassembling and reassembling
the swivel motor
1) Disassembling/reassembling tools
Torque wrench: 9.8~98 Nâ‹…m
Socket wrench: 14 mm
Hex hollow wrench: 5.8 mm
Bladed screwdriver
Plastic hammer
Snap ring removal tweezers (for hole and shaft)
Special screwdriver
2) Disassembling procedure
Wash the parts with clean oil and remove dust and
dirt off them. Also use due care not to give damage
or dent to them.
Replace the seals with new ones. Apply grease to
the new seals beforehand.
When disassembling the parts, clean around the
workshop and prepare plastic cases for keeping
the removed parts.
Before disassembly, clean around the ports of the
motor and remove paint from the connections
using a wire brush.
Disassembling procedure
1. Dismount the shock-less valve from the motor
body.
Do not disassemble the shock-less valve
unless necessary.
2. Fix the flange in a vise with the pinion gear
facing downward.
Remove the hex bolt.
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