U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-42
i. Cylinder natural fall amount
k. Lever stroke
1. Locate the machine on the flat ground, and put
the load the bucket.
Load on the bucket should be as follows.
U20-3: 280 kg - include bucket weight
620 lbs - include bucket weight
U25-3: 285 kg - include bucket weight
2. Arm cylinder must be fully retracted. Bucket
cylinder must be fully extended.
3. Locate the bottom of bracket about 1 m above
from the ground. Stop the engine.
4. Mark on the rod of each cylinder.
5. Measure the fall distance after 10 min.
1. Stop the engine.
2. Measure force of right and left control and
traveling levers.
3. Start the engine, operate the control lever or
traveling lever for a full stroke, and measure
the max. operating force.
4. Make three measurements and take their
average.
5. Hydraulic oil temperature must be 50 ± 5°C,
122 ± 9°F.
1. Stop the engine.
2. Move each lever from neutral to full stroke end,
and measure each stroke with respect to the
top center of the each lever grip.
3. If any lever is loose at its neutral position,
measure the stroke from each loose end.
4. Make three measurements and take their
average.
j. Control and Traveling lever operating force
Reference Value See IV-S-24
Reference Value See
II
-S-4
Reference Value See
II
-S-4
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