Bolens 19967-1 - Manual (Page 15)

Raise snow thrower off the ground and place a
block at each end of shave plate. Loosen 4 hex nuts
securing skid shoes to spiral housing (2 nuts on each
side). Move skid shoes up or down to desired position
and tighten nuts securely. Adjust both skid shoes to
the same height to keep spiral level. See figure 28.
SKID SHOE HEX NUTS
3. Tighten adjusting nut to secure chain adjustment.
Check chain clearance. It must clear chain guard
assembly. Test chain and repeat adjustment if
necessary until all excess slack is removed.
BELT TENSION ADJUSTMENT
Periodically check spiral drive belt to insure that it is
properly adjusted. It is important to maintain proper
belt adjustment to obtain maximum belt life.
The idler bracket has three holes for belt tension
adjustment. As the belt stretches from normal wear,
more belt tension may be required. Check the idler
spring for wear against the drive shaft at least once a
season. If the idler spring is rubbing against the drive
shaft, the belt has stretched and must be adjusted.
Remove the idler pulley from the bracket, and re­
assemble in next lower hole on the bracket.
If belt is stretched beyond idler take up, replace with
a new belt of the type specified in parts list.
FIGURE 28
SPIRAL DRIVE CHAIN ADJUSTMENT
Excessive slack in spiral drive chain due to normal
chain stretch can be removed by adjusting spiral
housing nuts.
i^To adjust spiral chain:
1. Disengage snow thrower and loosen the adjusting
nut 2 or 3 complete turns. See figure 29.
LUBRICATION
1. Spiral drive chain: Lubricate chain every 40
hours with No. 30 oil. It is important that oil
reaches inside each roller. Wipe off excess oil
from chain. See figure 30.
ADJUSTING NUT
FIGURE 29
2. Move adjusting nut down as needed.
A
CAUTION
Do not over tighten chain. A correctly
adjusted chain will have a slight a-
mount of slack. An over tightened
chain will result in early failure of
chain.
SPIRAL DRIVE
CHAIN
FIGURE 30
2. Pivot and friction points: To maintain smooth
and free operation, apply a few drops of No. 30
oil as required to all pivot and friction points.
The spiral and idler pulley bearings are self-lubricating.
However, periodic lubrication with No. 30 oil will
lengthen service life.
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