Remove two retaining pins (11) from upper end of lower leg and disassemble limit top plate (10)
operating screw nut (28) and oil reservoir (29).
Oil reservoir is partially filled with fluid. Provision should be made to pour
it out when disassembly is begun, or to work over a pan in which oil can
Slide seal (27) off of operating screw (26).
To remove bevel gear (19) from operating screw, file off punch marks at end of screw, and
unscrew nut (18).
Pull gear from screw, removing woodruff key (25).
Slide off upper bearing cone (20).
Remove bearing retainer (22).
Remove bearing cups (21) and (23) with puller if damaged.
c. Cleaning, Inspection and Repair.
(1) Cleaning. Wipe all parts clean. Where old lubricant has hardened, clean with dry cleaning solvent
(PD-680) (item 18, Appendix C). Clean roller bearing assemblies thoroughly.
(2) Inspection and repair. Inspect all parts for wear, distortion, and cracks. With fine file, hand-chase
threads at gear end of operating screw, if necessary. Check gear retaining nut for damage and
replace if necessary. Check operating screw for bend by rolling on fIat surface. Inspect bearings
and cups for wear and replace if unserviceable. Inspect bevel gear and replace if worn or damaged.
File off any burrs or distortions on operating screw threads. Check seal to make sure contact
material is intact and pliable; if not, replace with new seal assembly. Make sure surface of screw
which contacts seal is smooth; if not, remove distortion and finish with fine abrasive. Check felt
in collar to make sure it is pliable and not compressed or worn below the inner surface of the
collar. Clean and inspect all exterior surfaces for chipped or checked paint. Scrape loose paint to
metal and repaint. Check lubrication fittings for serviceability.
The key numbers shown below in parentheses refer to figure 4-57.
Install lower bearing cone (24) on operating screw, if it has been removed. Lubricate with
indicated lubricant (figs. 4-1 and 4-2) working thoroughly into all openings.
Install bearing retainer (22) and bearing cups (21) and (23). Lubricate upper cone (20) and bear-
ing and position on shaft.
Press bevel gear (19) and woodruff key (25) onto shaft of screw and secure with 7/8-14NF nut (18).
Do not tighten nut to extent that it will cause bearings to bind.
Secure nut (18) by punch marks on end of screw (26).
(5) Position seal and operating screw nut (28) on operating screw (26), running it about three-quarters
up length of thread.