Checking The Pilot Valve Spool Performance; Checking The Control Valve Spool Stick Performance; Measuring The Pilot Secondary Pressure - Kubota U20-3 Workshop Manual

U20-3, U25-3 WSM

2) Checking the pilot valve spool performance

3) Checking the control valve spool stick performance

4) Measuring the pilot secondary pressure

1. Operate the swivel lever and see if the pilot
valve spool functions well.
2. If the spool malfunctions, check for foreign
matters, scratches, deformation, etc.
3. If the swivel mechanism is in trouble in either
direction, reverse the two one-touch coupler
hoses below the valve. See if the trouble
happens in the other direction this time.
1. See if the swivel section spool moves well.
2. If the spool fails to move smoothly, check for
foreign matters, scratches, deformation, etc.
For servicing, refer to page IV-S-60.
1. Measure the secondary pressure between the
pilot valve and the control valve.
2. Make sure the pressure is as specified.
For measuring, refer to page IV-S-30.
IV-S-11
Hydraulic system (Service section)