13. Shim, bearing adj.
14. Housing, gear box
Cover, gear box
Shaft, screw drive
Ball Bearing Assy
4. Ball Bearing Assy
Figure 4-58. Left landing leg gear box (Thomas), exploded view
b. Cleaning, Inspection and Repair.
(1) Cleaning. Wipe off grease and clean all parts thoroughly with dry cleaning solvent (PD-680) (item
(2) Inspection and repair. Inspect bearings for wear or damage. Rollers should spin freely; if unservice-
able, replace. Inspect shaft and gear for wear, burrs, or distortion. Roll shaft on flat surface to
inspect for straightness. Remove burrs with fine file. Replace damaged part. Check lubrication
fitting to make sure it is free of obstructions.
Coat parts with light film of oil.
Install two snap rings (6 and 9) on screw drive shaft (7).
Position gear (10) and screw drive shaft, and secure with woodruff key (8).
Slide bearing sleeves (5 and 11) into position on screw drive shaft.
Install bearing adjusting shim (13) and ball bearing assembly (12) in gear box housing (14). Install
ball bearing assembly (4) in gear box cover (3).
Insert end of screw drive shaft in bearing in gear box housing and position other end of shaft in
cover bearing. Press entire assembly into position.
With gear box cover held tightly in place on gear box housing, test fit of bearings on shaft by
turning protruding end of shaft. Shaft should turn freely and have slight end play. Should shaft
appear to be restricted in turning, remove shaft and take out shim behind bearing. Should end
play be excessive, install another shim behind bearing.
Secure cover (3) to gear box housing (14) with four 5/16-18NC-2 X 7/8 capscrews (1) and 5/16