TM9-2330-207-14
b. Cleaning, Inspection and Repair.
(1) Cleaning. Wipe off grease and clean all parts thoroughly with dry-cleaning solvent (PD-680)
(item 18, Appendix C).
(2) Inspection and repair. Inspect bearings for wear or damage. Rollers should spin freely. If bearings
are unserviceable, replace them. Inspect shafts and gears for wear, burrs, or distortion. Roll shafts
on flat surface to inspect for straightness. Remove burrs with fine file. Replace damaged parts.
Inspect operating shaft locking spring for cracks or loss of resiliency. It can be removed by prying
out with screwdriver. Replace spring if unserviceable. (Check lubrication fitting (26) for service-
ability.) See para. 4-60b(2).
c. Assembly.
(1) Assemble screw drive shaft and attached parts.
(a) Coat parts with light film of oil.
(b) Install bevel gear (9) on screw drive shaft (6) and secure with taper groove pin (10).
(c) Install snap ring (5).
(d) Slide short spacer (11 ) on screw drive shaft and press on smalI spur gear (12) securing it with
one woodruff key (8).
(e) Slide on long spacer (13) and install large spur gear (14), securing it with one woodruff key
(f) Slide bearing sleeves (4 and 15) into position, one on each end of screw drive shaft (6).
(g) Install bearing adjusting shim (2), and ball bearing assembly (3) in seat in gear box housing
(1) and ball bearing assembly (16) in seat in gear box cover (17).
(2) Assemble operating shaft and attached parts.
(a) Coat parts with light film of oil.
(b) Make sure shaft locking spring (31) is in place, and slide operating shaft sleeve (21) into
position on shaft.
(c) Install inner snap ring (28) on sleeve
(d) Install small spur gear (33) and large spur gear (34) in order on shaft over square key (32),
and position snap ring (35).
(e) Lubricate needle bearings (18) and (19), as specified in lubrication chart (fig. 4-1).
(f) Press ball bearing assembly into each end of hole in cover (17) and press into position.
Inside bearing should be pressed in flush with surface. Outer bearing is to be pressed in
1/8-inch past surface.
(g) Position oil seal (20) over recessed outer bearing.
(h) Slide washer (27) onto operating shaft sleeve (21) and against ring.
(i) Insert shaft and sleeve assembly through inside face of cover and position.
(j) Apply washer (22) and outer snap ring (23) on shaft at outer end.
(3) Assemble unit.
(a) Insert end of screw drive shaft (6) into bearing in housing. Hold in position.
(b) Place cover (17) and operating shaft assembly (29) in approximate position in relation to
screw drive shaft; large spur gear (34) on operating shaft (29), behind large spur gear (14) on
screw drive shaft.
(c) Locate front end of screw drive shaft (6) in cover bearing and slide entire assembly into posi-
tion. Cover (17) must fit tightly against face of gear box housing (1).
(d) Hold cover in position tightly and test fit of bearings on screw drive shaft by turning protrud-
ing end of shaft. Shaft should turn freely and have slight end play. If shaft is restricted in
turning, remove shafts and take out shim behind bearing assembly (3) in housing. If endplay
is excessive, install another shim (2) behind bearing.
(e) Secure gear box mechanism by attaching cover (17) with six 5/16-18NC-2 X 7/8 capscrews
(24) and 5/16 Iockwashers (25).
