Chapter 3: Disassembly and Reassembly
4000 Mk2 Wheel Drive Service Manual 83158-1 11
4000 Mk2 Wheel Drive
3.4. Adjusting the clutch
2
3
1
Loosen the screw
(2 turns)
Tighten the screw
(2 turns)
To tighten
the clutch
(4 clicks)
To loosen
the clutch
(4 clicks)
Adjusting the clutch
Clutch knob
screw
Clutch knob
D5349-2
You need to adjust the clutch if you have removed the clutch eccentrics, replaced the ratchet
knob, or replaced the drive belt. When the clutch is correctly adjusted:
• the drive ring can rotate freely when the clutch is disengaged
• the drive belt does not slip when the clutch is engaged and the motor is driving
To adjust the clutch, make sure the clutch is disengaged. Then:
1. Use a 3 mm allen key to loosen the clutch knob screw about 2 turns anti-clockwise.
2. Turn the clutch knob either 4 clicks clockwise to tighten the clutch, or 4 clicks anti-
clockwise to loosen the clutch.
3. Use the allen key to re-tighten the clutch knob screw.
4. Check that the wheel still moves freely with the clutch off.
Note: If the wheel does not move freely, reduce the clutch tension by turning the clutch knob
2 clicks anti-clockwise and check again
5. Check the drive’s operation with the clutch engaged.
This procedure is usually sufficient to correct a slipping or dragging drive belt. In some cases,
however, you may need to repeat the steps to adjust the clutch further.
3.5. Cleaning the wheel drive
CAUTION:
Do NOT use mineral-based solvents (e.g. WD40) to lubricate or clean the wheel drive as
they will damage the material. The wheel drive is designed to run without lubrication.
• To clean the wheel drive front/rear cover: use a mild detergent if necessary, then flush
thoroughly with fresh water.
• To clean inside the wheel drive: if there is a build-up of salt on the wheel drive bearings
and drive belt, thoroughly flush the wheel drive interior with fresh water.
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