Check and adjust backlash

TM 9-2520-238-34

REPAIR COOLING FAN RIGHT ANGLE DRIVES A AND B -- Continued

0015 00

18. Check and adjust backlash as follows:

Install laminated shim (1), spindle assembly (2), laminated shim (3), and bearing retainer housing (4) on housing (5)

with four new key washers (6) and cap screws (7). Tighten screws, but do not bend tabs on key washers at this time.

Position housing (5) with shouldered shaft (9) in up position. Install backlash adjusting tool on shouldered shaft (9)

and secure tool by tightening socket head screw on tool. Attach dial indicator so that indicator feeler fits in notch

on arm of tool.

Check gear backlash by moving tool from side to side while observing dial indicator. Backlash reading should be

between 0.002 inch and 0.004 inch.

If backlash is less than 0.002 inch, add more laminates to shim (1). If backlash is greater than 0.004 inch, remove

laminates from shim.

If required, install new thickness shim and recheck backlash by repeating Steps 18a - 18c above.

Remove dial indicator and backlash adjusting tool from shouldered shaft (9).

Remove four cap screws (7), key washers (6), bearing retainer housing (4), laminated shim (3), and spindle

assembly (2), and laminated shim (1) from housing (5).

0015 00-16