U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-30
Control valve section layout
(1) Rod (2) Bottom
(3) Communicating valve (4) Dozer
(5) Swing (6) Swivel
(7) Spare (8) Arm
(9) Travel left (10) Travel right
(11) Boom (12) Bucket
b. Pressure measurement
[1] Pilot pressure
1) Pilot primary pressure
1. Remove the left cover of the bonnet.
2. Disconnect the plug (1/8) from the elbow pipe
joint of the pilot filter. Set the pressure gauge.
3. Start the engine. Take the reading at the
maximum speed. Take 3 measurements and
take the average.
* Keep the oil temperature at 50±5°C.
2) Pilot secondary pressure
(in moving up the boom)
1. Remove the steps and swivel cover.
2. There is the hose between the pilot valve and
control valve. Disconnect this hose from the
control valve alone.
3. Attach the T joint and set the pressure gauge.
4. Start the engine. At the maximum rpm, move
up the boom and take the reading.
5. Take 3 measurements and take the average.
* Keep the oil temperature at 50±5°C.
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