830-860 SERIES SELF-PROPELLED MOWERS
9
9.
Check the crankshaft pulley:
9a. The splines in both sheaves of the crank-
shaft pulley should be clean and smooth,
so that they slide together easily.
See Figure 4.9.
NOTE:
The splines should not need lubrication.
If any lubrication is applied, use a dry PTFE
(Teflon
TM
) or graphite based lubricant in very
sparing quantities.
9b. The upper sheave of the crankshaft pulley
should slide off of the crankshaft. There is
a spacer above the sheave. The length of
the spacer will vary with the engine
model. If one end of the I.D. of the spacer
is rounded or beveled, that is the end that
goes up, toward the engine.
See Figure 4.10.
Figure 4.9
Upper sheave
of crankshaft
pulley
Splines
Figure 4.10
Crankshaft spacer
(varies with
engine model)
10.
Replace the belt:
10a. Reverse the removal process.
10b. It will help to spread the sheaves on the
transmission pulley, and tug the belt deep
into the sheaves of the transmission pul-
ley. This will leave the maximum amount
of slack in the belt, so it is easier to slip
around the crankshaft pulley.
See Figure 4.11.
NOTE:
Use only the Original Equipment belt.
Other belts of slightly different size or profile will
effect the grounds speed of the mower. Belts of
different material may wear-out faster.
Figure 4.11
Carefully spread the sheaves of the variable
speed pulley on the transmission to ease
belt installation.
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