U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-41
8) Travel
f. Straight travel performance
h. Control and Traveling lever stroke
1. Bring the machine into traveling posture and
run up the machine until each speed reaches
the maximum.
2. Measure the time required for travel in 10 m
distance.
(1) Run-up
(2) Distance for measurement (10 m)
* Rubber crawler type
U20-3
U25-3
1. Bring the machine into traveling posture. With
the engine running at maximum rpm, move the
lever for full stroke to run the machine in 10 m
distance.
2. Measure the error from the track as viewed
above from the straight line.
1. Conduct measurement with regard to the right
and left levers.
2. Start the engine, move the levers for full stroke
and measure the maximum operating force in
relief state.
3. Repeat the measurement 3 times, obtain the
average and adopt it as measured value.
* Conduct measurement at oil temperature of
50±5°C.
1. Stop the engine.
2. Move each of the travel, boom, arm, bucket
and dozer control levers from neutral to full
stroke end and measure their strokes at the
top center of each lever grip.
3. If any of the levers is out of position, measure
the stroke from its loose end.
4. Conduct the measurement along a straight
line.
5. Repeat the measurement 3 times, obtain the
average and adopt it as measured value.
g. Control and Traveling lever operating force
1F 2F
15.0~18.0 sec. 7.8~9.5 sec.
1F 2F
12.8~15.7 sec. 7.2~8.8 sec.
600mm
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