Kubota B1220, Workshop Manual

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CLUTCH
B1220, B1620, B1820, WSM
2-S11 (EU)
[3] SERVICING
Backlash between Clutch Disc and Clutch Shaft
1. Mount the clutch disc onto the clutch shaft.
2. Hold the clutch shaft so that it does not rotate.
3. Slightly move the disc and measure the displacement around
disc edge.
4. If the measurement exceeds the allowable limit, replace clutch
disc.
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Clutch Disc Wear
1. Measure the depth from clutch disc surface to the top of rivet at
least 10 points with a depth gauge.
2. If the depth is less than the allowable limit, replace the disc.
3. If oil is sticking to clutch disc, or disc surface is carbonized,
replace the clutch disc.
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Pressure Plate Flatness
1. Place a straightedge on the pressure plate and measure
clearance with a feeler gauge at several points.
2. If the clearance exceeds the allowable limit, replace it.
3. When the pressure plate is worn around its outside and its
inside surface only is in contact with the straightedge, replace
even if the clearance is within allowable limit.
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Checking Pressure Plate and Diaphragm
1. Check the pressure plate and if scratched on its surface, correct
with sandpaper or replace it.
2. Check the diaphragm for crack and scratches. If defects are
found, replace it.
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Checking Clutch Release Bearing
1. Check the clutch release bearing. If surface is worn excessively,
or abnormal sounds occur, replace it.
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Displacement around
disc edge
Allowable limit
2.0 mm
0.079 in.
Disc surface to rivet top
(Depth)
Allowable limit
0.3 mm
0.01 in.
Clearance between
pressure plate and
straightedge
Allowable limit
0.2 mm
0.008 in.
KiSC issued 07, 2011 A