Kubota B1830, Workshop Manual

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TRANSMISSION B1830,B2230,B2530,B3030, WSM
3-S71
Neutral Valve
1. Check the holes of the valve body (9) and the neutral valve (4)
for clogging.
2. If clogged, open hole with compressed air.
3. Replace the O-rings (2), (6), (8) and the backup ring (7) for
scratches and damage.
4. Check the springs for breakage and wear.
5. If the valve surface is scored, replace it.
6. If anything is unusual, replace it.
9Y1210003TRS0102US0
Charge Relief Valve
1. Check the spring (2) for breakage and wear.
2. If it is unusual, replace it.
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Cylinder Block Bore and Pistons
1. Lift all the pistons gently with the retainer plate (1).
2. Check the pistons for their free movement in the cylinder block
bores.
3. If the piston or the cylinder block bore is scored, replace cylinder
block assembly.
IMPORTANT
• Do not interchange pistons between pump and motor
cylinder block. Pistons and cylinder blocks are matched.
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(4) Independent PTO Clutch
Checking Bearing
1. Hold the inner race, and push and pull the outer race in all
directions to check for wear and roughness.
2. Apply transmission fluid to the bearing, and hold the inner race.
Then, turn the outer race to check rotation.
3. If there is any defect, replace it.
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Tightening torque Neutral valve plug
58.5 to 68.6 N·m
6.0 to 7.0 kgf·m
43.4 to 50.6 lbf·ft
(1) Plug
(2) O-ring
(3) Spring
(4) Neutral Valve
(5) Pin (6) O-ring
(7) Backup Ring
(8) O-ring
(9) Valve Body
(10) Plug
(1) HST Housing
(2) Spring (3) Poppet
(4) Center Section
Clearance between
piston and bore
Factory specification
0.02 mm
0.0008 in.
Allowable limit
0.04 mm
0.0016 in.
(1) Retainer Plate
KiSC issued 05, 2012 A