4. Checking and replacing V-belt and clutch:
a. Checking the V-belt (See Fig.33)
In every 200 hours of operation, with the belt
cover (upper) removed, check the tension of
V-belt. The tension is normal if the bend is
about 10mm when the belt is pressed with our
finger at midway between the pulleys.
Fig.33
Belt cover (lower)
Vibrator pulley
Belt
Clutch
Belt cover
(upper)
When the belt is slackened, transmission of
engine rotation will be deficient, resulting in
poor compaction and accelerated wear of the
belt.
b. V-belt replacing procedure:
With upper and lower belt covers removed, engage offset
wrench (13mm) to vibrator pulley tightening bolt (lower).
Hook a piece of cloth at left side midway of the V-belt
and pull it back forcibly while rotating the wrench
clockwise until the belt comes off.
V‑belt removal
Fig.34
Engage the V-belt to vibrator pulley at the bottom and press the V-belt against left side of the upper
clutch. Same as in the case of removal, rotate the offset wrench clockwise until the belt is
installed.
V‑belt reinstallation
! Note:
There is a risk for injury. Use sufficient care for your hand not to be caught between the
belt and clutch. Use glove for protection.
c. Checking the clutch:
Check the clutch simultaneously when you check V-belt. With the belt cover removed, visually
check the outer drum of clutch for seizure, V-groove for wear or damage. Clean the V-groove as
necessary.
Wear of lining and shoe should be checked through operation.
Worn shoe reduces transmission efficiency of engine rotation, causing a slip to occur.
d. Replacing the clutch:
●
Remove V-belt (See above for the procedure).
●
Remove bolt at the engine power output shaft end by giving a shock to a wrench (tap on with
hammer) engaged to it and turning it counterclockwise.
●
Pull out the clutch by means of pulley puller.
●
Reinstall the clutch with above procedure reversed. Turn-in the bolt securely by giving a shock to
the wrench in use.
! Note:
If vibration is weakened during operation or vibration does not occur in spite of engine
running, conduct the check of V-belt and clutch regardless of maintenance interval of 200
hours.
22
Summary of Contents for Mikasa MVH120
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