CLUTCH
L3301, L3901, L4701, WSM
2-S22
6. SERVICING
[1] SINGLE STAGE CLUTCH
Backlash between Clutch Disc Boss and Shaft
1. Mount the clutch disc to the main shaft.
2. Hold the main shaft so that it does not turn.
3. Rotate disc lightly and measure the displacement around the
disc edge.
4. If the measurement exceeds the allowable limit, replace the
clutch disc.
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Release Bearing
1. Check for abnormal wear on contact surface.
2. Rotate bearing outer race, while applying pressure to it.
3. If the bearing rotation is rough or noisy, replace the release
bearing.
• Do not depress bearing outer race, when replacing the
release bearing.
• Do not wash the release bearing with a cleaning solvent.
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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.
In this case, inspect transmission gear shaft oil seal, engine rear
oil seal and other points for oil leakage.
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Checking Pressure Plate Assembly and Flywheel
1. Wash the disassembling parts except clutch disc with a suitable
cleaning solvent to remove dirt and grease before making
inspection and adjustment.
2. Inspect the friction surface of pressure plate and flywheel for
scoring or roughness.
• Slight roughness may be smoothed by using fine emery cloth.
• If these parts have deep scores or grooves on their surface,
they should be replaced.
3. Inspect the surface of diaphragm spring for wear.
If excessive wear is found, replace the clutch cover assembly.
4. Inspect thrust rings (wire ring) for wear or damage.
As these parts are invisible from outside, shake pressure plate
assembly up and down to listen for chattering noise, or lightly
hammer on rivets for a slightly cracked noise. Any of these
noises indicates need of replace as a complete assembly.
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Backlash (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.
Diaphragm spring mutual
difference
Allowable limit
0.5 mm
0.02 in.
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