Hyundai HYCH7070 User Manual page 23

7.8.4.2. If the gap gauge will not slide down between the knives and wear
plate, the wear plate must be adjusted.
7.8.4.3. If the gap gauge slides in between the knives and wear plate with
some resistance felt against them both or slides in between with no noticeable
space, then the wear plate is properly adjusted.
7.8.5. If the wear plate is not set correctly, excessive vibration will occur when
chipping and the knife will seem to be dull. If there is not enough clearance,
the knife edges may touch the wear plate through deflection when cutting
heavy branches and damage the sharp edge. Too much clearance will allow
small twigs and fibrous materials to be dragged through without being cut.
7.9. V-Belt check.
7.9.4. To ensure optimum power transmission from the engine to the rotor shaft,
the V-Belts must be in good condition and operate under proper tension.
7.9.5. Turn off engine. Engine must be cool.
7.9.6. Pull up belt tension lever to get the belts tight in working condition.
7.9.7. Remove the top belt guard from the front housing by taking off the fixing
bolts.
7.9.8. Check the condition of the V-Belts. If any V-Belt is cracked, frayed, or glazed,
it should be replaced as soon as convenient.
7.9.9. Check the V-Belt tension by squeezing them in the centre. The normal
defection on each side should be approximately 3/8" with moderate pressure
from your thumb or finger.
7.10. V-Belt tensioning.
7.10.1. Proper belt tension is critical to good performance. Proper adjustment will
assure long belt lift. Too much or too little belt tension will cause premature
belt failure.
7.10.1.1. Turn off engine. Engine must be cool.
7.10.1.2. Pull up belt tension lever to get the belts tight in working condition.
7.10.1.3. Remove the top belt guard from the front housing by taking off the
fixing bolts.
7.10.1.4. Loosen two M12 adjustment nuts by turning them in the anti-clockwise
direction and move downward to reduce any slack in V-Belts
7.11. When the V-Belt tension is correct, tighten two M12 adjustment nuts by turning
them in the clockwise direction. If the V-Belt tension is too tight, loosen it in the
reverse procedure by moving upward two M12 adjustment nuts and adjusting
sleeve in between two M12 adjustment nuts.
7.12. Install the upper and lower belt guards and secure them with fixing bolts.
When adjusting the belt(s), make sure that the engine pulley is in
alignment with cutting disk pulley.
7.13. V-Belt replacement.
Both V-Belts should be replaced at the same time because they will
wear evenly through normal use. Work on one belt at a time.
7.13.1. Turn off engine. Engine must be cool.
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