Service Manual 73
Page 21 of 32
On idlers that use bronze bushings, there is a hole through the root diameter of one of
the teeth. Use this hole to drill a hole through the bronze bushing.
B. Tungsten carbide or high-temperature carbon bushings:
Heat the idler gear evenly to about 400°F (204°C).
Set the heated idler gear on a flat surface.
Drop the bushing into the idler gear; making certain that the bushing is flush to slightly
below the face of the idler.
Ensure that the bushing does not protrude beyond the surface of the idler on both faces.
Some sizes of idler gears use two bushings. If this is the case, install a bushing from
each side making sure that the bushings do not protrude beyond the surface of the idler
on either face.
Allow the idler to air-cool to room temperature.
!
WARNING
Wear heat-resistant gloves when handling hot components.
INSERT NEW BRACKET BUSHING (if necessary):
A. Bronze or standard carbon bushings:
Insert the new bushing with the assistance of a hand arbor press. Always install the
bushing from the chamfered end of the bracket.
!
CAUTION
Special care must be taken during the insertion of carbon bushings. Ensure that the bushing
diameter and idler bore are parallel, as any misalignment during insertion may cause cracks. The
bushing should be installed using the side of the bushing with the chamfer. Once insertion starts
DO NOT STOP until the bushing is in proper position. Starting and stopping can result in cracked
bushings.
On brackets that use bronze bushings, there is a hole through the bracket above the
bushing. Use this hole to drill a hole through the bronze bushing.
B. Tungsten carbide or high-temperature carbon bushings:
Heat the bracket evenly to about 400°F (204°C).
Set the heated bracket on a flat surface. Use a spacer block to properly locate the
bushing (see Figure 8).
