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 TM 55-1905-217-34
(e) Inspect the sun gear shaft (13, fig. 443). Check the gear teeth for wear by comparing the
tooth-thickness at the worn area of the teeth with the tooth-thickness at the unworn end. If the wear is grater
than .012 inch replace the sun gear shaft.
(f) Inspect the taper seal ring (12), if the tapered diameter has any roughness or scratches
remove the tapered seal ring from the shaft by using a punch between the gear teeth to drive the ring off the
shaft. Replace with a new taper seal ring.
NOTE
If any one of the gears in this assembly requires replacement because of tooth
wear, all gears in the assembly should be replaced.
(2) Inspection of primary drive assembly.
(a) Place the primary planet assembly (12, fig. 4-44) to one side and wash all other parts in
solvent (FED. SPEC. PD-680). Dry thoroughly with compressed air or clean cloths. Do not wash the primary
planet assembly unless it is faulty and requires to be replaced or disassembled.
(b) Inspect the bore in the spring cover (3) for scores or bruises. If possible smooth out scores or
bruises with a scraper and extra fine emery cloth in order that preformed packing (6) will seal effectively.
(c) Check snap ring (7) for flatness and that it forms a true circle, if bent or damaged replace.
(d) Inspect the retainer (9) for distortion. Be sure that it seats properly all around the bottom of
the groove in the bore of the segments (10). Check the segments (10) for flatness, replace with new parts if
bent or distorted.
(e) Check that the planet gears in the primary planet assembly (12) will rotate freely and
smoothly in one direction and that they will all "lock up" in the opposite direction. If any of the gears will not
lock instantly in the "lock up" direction or if there is the slightest slippage in this direction, replace the assembly.
(f) Inspect the teeth in the ring gear (13). Replace if wear is excessive.
(g) Inspect the backing plate (14) for wear on the friction face. If the wear exceeds 1/16 inch
replace with a new part. The original thickness was .627 inch at the thickest point. Check the external teeth for
wear. If wear is excessive replace with a new part.
(h) Inspect the friction surfaces of the brake plates (15), if wear has removed the grooves,
replace the plates.
(i) Check divider plate (16) for wear and distortion. If wear is excessive or if the plate is buckled
or does not form a true circle replace with a new part.
(3) Inspection of drum and bearings (fig. 443).
(a) Wash all parts in solvent (FEI). SPEC. PD-680) and dry thoroughly using compressed air or
clean cloths.
CAUTION
Do not dry or spin the bearings with compressed air. Allow the bearings to air dry
after they are properly cleaned
(b) Check the seal diameters at each end of the drum (20) for rust or roughness. Clean and
polish the seal diameters using extra fine emery cloth. Check the bearing hub diameters for scores and wear.
If there is any wear, possibly caused by a seized bearing, the drum will require to be replaced.
(c) Inspect the seal face in the bore of the drum (20) at the splined end. This face must have a
smooth finish and be free from scratches, etc. Polish if necessary with extra fine emery cloth. If this surface is
damaged the drum will require to be replaced.
(d) Inspect the drum bushing (5) for bruises, scores and wear. Remove all high spots from
bruises or scores using a scraper. The original inside diameter of this bushing was 2.190 inches. If wear is
greater than .010 inch in diameter, remove the bushing and replace it with a new part.
(e) Inspect the ball bearings (1) and (18) for wear and pitting at the balls and ball grooves.
Replace bearings if worn or pitted.
(4) Inspection of final planet assembly (fig. 4-45).
(a) Wash all parts in solvent (FED. SPEC. PD-680) and dry thoroughly using compressed air or
clean cloths.
CAUTION
Do not dry the ball bearings with compressed air. Allow them to air dry after they
are properly cleaned.
(b) Inspect the planet pin bores in the planet hub (6) for scores or bruises which may have been
caused in removing the planet pins. Remove the high spots of any scores or bruises carefully with a scraper,
sufficiently to allow a planet pin to be pressed into each bore by hand.
(c) Inspect the planet pin (1) for excessive wear at the bearing area. If wear exceeds .001 inch
on the diameter the pin should be replaced.
(d) Check the planet gears (4) for wear and damage on the gear teeth. If wear is excessive
replace the planet gears. Inspect the ball bearings (2) for wear and pitting at the balls and ball grooves.
Replace bearings if worn or pitted.
e. Reassembly.
(1) Assemble bearings and seals to drum.
4-69
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