Kubota U20-3 Workshop Manual page 440

U20-3, U25-3 WSM
39. Attach the spring to the spool and fit the spool
to the base plate.
• Apply hydraulic oil to the spool and insert it
while turning it.
40. Attach the O-ring to the plug and fit the plug to
the base plate.
• Tightening torque of plug: 36.8±2.5 N⋅m
41. Fit the O-ring to the valve body.
Apply a small amount of grease to the O-ring.
IV-S-125
Hydraulic system (Service section)