TM 9-2320-260-34-2
16-25. HOIST BEVEL GEARCASE REPAIR (M816) (Contd)
19.
Examine pigment pattern on teeth of bevel gear ( 12). Compare pigment patterns to examples below:
a. If pattern most resembles example A, no further adjustments are necessary. Go to step 22.
b. If pattern most resembles example B, gears (10) and ( 12) are meshing too deeply. Go to step 20.
c. If pattern most resembles example C, gears (10) and (12) are not meshing deep enough. Go to
step 21.
20.
Remove four screws (7), Iockwashers (8), cover (6), gasket (5), and shims (4) from gearcase
housing (9). Add shim(s), and repeat step 8 and steps 16 through 19.
21.
Remove four screws (7), lockwashers (8), cover (6), gasket (5), and shims (4) from gearcase
housing (9). Subtract shim(s) and repeat step 8 and steps 16 through 19.
Thoroughly clean bevel gears (10) and (12). Ensure no pigment remains on teeth.
22.
Aline bevel gears (10) and (12) and install housing(1) on gearcase housing (9) with six new
23.
lockwashers (3) and screws (2). Tighten screws (2) 25-33 lb-ft (34-45 Nm).
Install dial indicator with extension on gearcase housing (9) and gear (12). Ensure extension contacts
24.
gear (12) on outer edge of tooth.
Zero dial indicator by holding driveshaft ( 13) and turning yoke ( 14) counterclockwise.
25.
26.
Turn yoke (14) clockwise until resistance is felt.
27.
Read backlash on dial indicator. Backlash should be 0.004-0.008 in (0. 10-0.20 mm). If backlash is
incorrect, replace worn bevel gears (10) and (12).
28.
Remove six screws (2), lock washers (3), housing ( 1), and new gasket (11) from gearcase housing (9).
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