U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-38
d.
Measurement of block performance
[1] Swivel
[2] Travel
1) Measuring procedure
1. Park the machine on a 20-degree slope.
2. Bring the front attachments into such a posture
that the arm is ready for dumping and the
bucket is crowded, and hold the boom in line
with the boom root pin and bucket pin.
3. Mark the swivel race outer ring and the lower
frame and measure the displacement
generated for 1 minute.
4. Start the engine, unlock the lever while idling
and start the measurement.
5. A bucket load should be JIS crowded x specific
gravity 1.8.
6. Conduct the measurement at hydraulic
temperature of 50±5°C.
Allowable range
1) Measuring procedure
1. Park the machine on a 20-degree slope and
bring the front attachments into traveling
posture.
2. Mark the lower travel frame and the crawler
and measure the displacement generated for
10 minutes.
3. Conduct the measurement at hydraulic
temperature of 50±5°C.
Allowable range
On race periphery: U20-3 131
U25-3 140
Crawler inside: 300 mm
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