Fig. 7 - Typical Details and Relative Location of Parts
Check the finished ends of the blower housing, for
chipping or damage. If the gears are worn to the point
flatness and burrs. The end plates must set flat against
where the backlash between the gear teeth exceeds
the blower housing.
.004", or damaged sufficiently to require replacement,
both gears must be replaced as a set.
The finished inside face of each end plate must be
Check the blower drive shaft serrations for wear or
smooth and flat. If the finished face is slightly scored or
peening. Replace the shaft if it is bent, cracked or has
burred, it may be cleaned up with emery cloth.
excessive spline wear.
NOTE: Be careful not to remove
Inspect the serrations inside the rotor drive hub for wear
metal at the joint face between the
end plates and the housing. Air or
oil leaks could develop after
Inspect the blower drive coupling springs (pack) and the
cam for wear.
Examine the serrations in the blower timing gears for
wear and peening; also check the teeth for wear,