U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-12
5) Checking the brake release
6) Checking the brake valve pressure
1. Measure the pressure between the solenoid
valve and the swivel motor brake.
2. Make sure the pressure is as specified.
3. Start the engine and unlock the control lever.
Extend the front attachment in maximum reach
in the air, and move the bucket by hand (using
your reaction force). Make sure the swivel
mechanism starts and the brake gets applied
when it gets locked.
For measuring and servicing, refer to pages
IV-S-35 and IV-S-78, respectively.
1. Measure the brake valve pressure.
(Before the measurement, bring the bucket
end in contact with something fixed.)
2. Make sure the pressure is as specified.
3. Readjust the relief valve, or disassemble and
clean it up.
a: For clockwise swivel
b: For counterclockwise swivel
For measuring and servicing, refer to pages
IV-S-34 and IV-S-78, respectively.
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