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 TM 55-1905-219-14-6
3-166.3. IDLER GEAR AND BEARING ASSEMBLY - MAINTENANCE INSTRUCTIONS
(Continued).
LOCATION
ITEM
ACTION
REMARKS
PRE-LOAD CHECK OF BEARING
(Cont)
(2) Install the center bolt and washer through the gear hub and thread into the cylinder block a
1/2-13 inch x 2 1/2 inch bolt, (replacing the 1/2-13 inch x 2 inch bolt). Tighten the bolt to 80-
90 lb-ft (108.5-122.Nm) torque.
(3) Place a steel plate (lower plate) against hub and bearing. Insert three 3/8-16 inch bolts
through plate and threaded into hub. Tighten the bolts to 25-40 lb-ft (33.9-54.2 Nm) torque.
(4) Tie one end of a piece of lintless 1/8 inch cord around a 1/8 inch round piece of wood (or soft
metal stock). Place the wood between the teeth of gear. then wrap the cord around the
periphery of the gear several times. Attach the other end of the cord to a spring scale.
Maintain a straight, steady pull on the scale, 900 to the axis of the hub, and note the pull, in
pounds and ounces, required to start the gear rotating. Make several checks to obtain an
average reading. If the pull is within 1 1/4 lb. minimum to 6 lbs. 12 ounces maximum and
does not fluctuate more than 2 lbs. 11 ounces, the idler gear and bearing assembly are
satisfactory for use.
3-2843
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