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5.2.2 DRIVE CHAIN TENSION AND ALIGNMENT
A roller chain transmits rotational power to the
roller. It must be kept properly tensioned and
the sprockets aligned to obtain the expected
performance and life.
To check the tension and alignment, follow this
procedure:
1. Clear the area of bystanders, especially
small children.
2. Turn machine off, stop engine, remove ig-
nition key and place in pocket and wait for
all moving parts to stop.
3. Remove panel over chain.
4. The chain should have +/- 1 inch (25 mm)
of play to be properly tensioned.
5.
To adjust chain tension:
a. Loosen idler mounting bolts.
b. Move the idler to the required position
to set chain tension.
c. Set sprocket alignment.
d. Tighten mounting bolt to its specified
torque.
6.
To replace chain:
a. Move idler to its loosest position.
b. Replace chain.
c. Set sprocket alignment.
d. Tighten idler mounting bolt to its speci-
fied torque.
e.
Check frequently during the first ten
hours and set chain tension as re-
quired.
7. Lay a straight edge across the sprocket
faces to check alignment. Adjust align-
ment if sprocket faces vary more than 1/32
inch (.7 mm).
Fig. 73 CHAIN DRIVE SYSTEM / IDLER