Floating Duo-Cone Seals

with no oil present. Check the ramps for rough tool

CAUTION

marks and nicks. On used parts, remove all dirt or

At assembly, align the milled slot in

rust deposits from the ramps with a scraper or wire

bearing rage with the dowel in hearing

brush and smooth the surface with emery cloth.

c a g e holder assembly (1, fig. 6-116).

(3) Always install new rubber toric sealing

This is not a press fit and can be

rings (1, fig. 2-8) on floating ring seals (2). Never

a s s e m b l e d by using a soft hammer.

install a used toric sealing ring on a new or used

Insert the assembly to see that hearing

floating ring seal.

cage (2) has bottomed in the bearing

NOTE

cage holder.

Use seal installer tool (fig. 2-9) to install metal floating

c. Inspection and Repair.

ring seal (2, fig. 2-8), and toric sealing ring (3) into

(1) Inspect bearings for corrosion, pitting, and

seal mounting groove (4). Be sure not to bump the

floating ring seal When removing the installer tool.

wear. Replace corroded, rough, or worn bearings.

(2) Inspect holder assembly (2, fig. 6-114) for

(4) Install toric sealing ring (3) so it seats

cracks, breaks, and other damage. Replace a

uniformly in the relief of floating ring seal (2). Be

defective or damaged holder assembly.

sure the toric sealing ring is not twisted and that it

d. Reassembly and Installation. Reverse

sets straight and against the lip that keeps it from

disassembly and removal procedure and assemble

falling off the floating seal (fig. 2-10).

and install the bearing cage holder assembly on the

(5) If the installer tool is not used, install the

final drive assembly.

toric sealing ring (3, fig. 2-8) and floating ring seal

6-22. Floating Duo-Cone Seals

(2) as an assembly into groove (3) by pressing on

the toric sealing ring at location (3). Be sure the

a. Removal. To remove the outer metal floating

toric sealing ring is seated uniformly in the recess of

ring seal, it is necessary to remove the track roller

both the floating ring seal and the groove. Make

frame (para 7-10), outer bearing (para 6-20),

sure that it sets in the bore straight and against the

holder and outer bearing adjusting hub outer

lip that keeps it from falling out of the retainer (fig.

bearing cage holder and outer bearing adjusting nut

2-10).

(para 6-20). The sprocket must be removed to

CAUTION

service or replace the inner metal floating ring seal

If installer tool is not used, do not use a

(para 6-23).

screwdriver or stick to assemble the

b. Cleaning.

toric sealing ring in the groove. Use

(1) Wash off all dirt accumulation from used

finger pressure only.

parts using cleaning solvent (Fed. Spec. P-D-680).

(6) Instal the floating ring seal to a uniform

It may be necessary to use a wire brush to clean the

depth in the groove. The dimension (1, fig. 2-8)

accumulations of dirt or rust from the bore of the

must be uniform around the entire circumference of

seal mounting grooves to assure they are clean and

the floating ring seal.

smooth.

(7) Always install the floating ring seals (fig. 2-

(2) Remove all oil or the protective coating

10) in pairs, that is, two new seals together or two

from the floating seals with cleaning solvent.

seals that have previously run together. Never

c. Inspection. Inspect the metal floating ring

assemble one new seal and one used seal or two

seals (8 and 9, fig. 6-114) for damage. Replace the

seals that have not previously run together.

seals if there are scratches across the sealing bands

(8) Before assembling floating ring seals

or if contact is not clearly defined around the outer

together, wipe faces of seals with lint-free tissue to

edges. If either floating ring seal is damaged, both

remove any foreign material and finger prints.

must be replaced.

CAUTION

(9) Place one drop of light oil on the cleaning

tissue and coat the sealing surfaces of the seals. Be

To obtain maximum service, cleanliness

careful not to let any oil come in contact with the

must be the rule. Avoid introducing dirt

toric sealing ring or its mating surface.

into the parts during installation or

filling w ith oil.

6-23. Sprocket and Sprocket Segments

d. Installation.

a. Sprocket.

(1) Handle all parts with care to avoid nicks in

(1) Removal.

critical areas. File smooth any parts, other than the

(a) Remove floating ring seal (3, fig. 6-117

sealing faces, that have nicks that may make

as described in paragraph 6-22.

assembly difficult or questionable.

(b) Bend lock (1) securing retaining nut (2)

(2) Be sure the ramps on the seal mounting

grooves and on the floating ring seal are dry and

6-95