d. Install bearing (8), gear (7), washer (6) and
Cleaning, Inspection and Repair
screw (5) from the top of the assembly, working through
a. Clean all metal parts with cleaning solvent,
the access opening in the revolving fame top. Do not
Federal Specification P-D-680, or equivalent, before
lockwire the screws at this time.
e. Install packing (19) in retainer (3), and
b. Replace all gaskets, seals, deformed shims,
install shims (15), (16) and (17), and gasket (18). Secure
packing, and other expendable parts.
the entire assembly with nuts (1) and lock washers (2).
c. Inspect all parts for wear, scoring, cracks or
With the vertical swingshaft installed in this
other signs of damage or excessive wear. Inspect gear
manner, check backlash and tooth contact between the
teeth for signs of uneven wear, pitting or cracks, especially
horizontal swing shaft gears and the vertical swing shaft
at the roots of the teeth.
gear () as shown in figure 5-14.
d. Inspect and smooth all seal seating surfaces
g. Correct backlash is between 0.008 and
with a fine oil stone or crocus cloth.
0.013 inch. If backlash is not within these limits, add or
remove sufficient shims (15), (16) and (17) to bring
a. Refer to figure 5-13 and install bearing (8).
backlash within these limits.
Install oil seal (11) in retainer (12), and spacer (13) with
h. Gear tooth contact should be
retainer (12) and oil seal (11) on pinion shaft (14).
approximately in the center of vertical swing shat gear
b. Warm and install bearing (10) on pinion shaft
(7) as illustrated in figure 5-15. If it is not in the
(14), with the inner race of the bearing firmly against
approximate center, move the horizontal swing shaft in
our out as required by removing or adding shims (25)
c. Place spacer (9) on pinion shat (14) and insert
and (26), figure 5-11.
the entire assembly into position through the bottom of the
After the above adjustments have been
bore. Temporarily hold the pinion shaft in place with
completed, lockwire screws (5), figure 5-13.
Figure 5-14. Checking vertical swingshaft bevel gear backlash