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 TM 55-1905-219-14-5
3-91.3. IDLER GEAR AND BEARING ASSEMBLY - MAINTENANCE
INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
PRE-LOAD CHECK OF BEARING (Cont)
(3) Place steel plate (lower plate) against hub and bearing. Insert three 3/8"-16 bolts through plate and
threaded into hub. Tighten the bolts to 25-40 lb-ft torque.
(4) Tie one end of a piece of lintless 1/8" cord around a 1/8" 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 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.
i. To check the pre-load by the second method:
(1) Attach the plates (two upper plates) to the idler gear with 1/2"-13 center bolt, washers and nut as
shown. Tighten the bolt to 80-90 lb-ft (119 - 134 kg/m) torque.
3-1581
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