Dry Parts; Oil Seals And O-Rings; Inspect Parts - Meritor MM-0861 Maintenance Manual

6 Prepare Parts for Assembly

Dry Parts

WARNING
Dry bearings with clean paper or rags. NEVER use compressed
air, which can cause abrasive particles to contaminate the
bearings. Damage to components and reduced lining life can
result. Using compressed air can also cause the rollers to be
forced out of their cage and propelled into the air, causing injury.
• Immediately after cleaning, use clean paper, cloth rags, or
compressed air to dry the parts. Do not use compressed air
to dry the bearings.
Prevent Corrosion
NOTE: Parts must be clean and dry before lubricating them.
• Apply a light oil to cleaned and dried parts that are not
damaged and are to be immediately assembled.
• If the parts are being stored after cleaning, apply a
corrosion-preventive material to all machined surfaces.
Store the parts in a special paper or other material that
prevents corrosion.

Oil Seals and O-rings

Discard all oil seals and o-rings. Replace with new parts.

Inspect Parts

It is very important to inspect all parts carefully and completely
before the transfer case is assembled. Check all parts for wear and
stress. Replace all damaged parts to avoid costly downtime at a
future date.
For more detailed information about parts inspection, refer to
TP-0445, Meritor Parts Failure Analysis. To obtain this publication,
refer to the Service Notes page on the front inside cover of this
manual.
Tapered Roller Bearings
Inspect the tapered roller bearings. Inspect the cup, cone, rollers,
and cage of all tapered roller bearings in the assembly. If any of the
following conditions exist, the bearing must be replaced:
• The center of the large diameter end of the rollers is worn
level with or below the outer surface.
• The radius at the large diameter end of the rollers is worn to
a sharp edge.
MM-0861 / Revised 06-22
Page 54
Figure 6.1
• A visible roller groove is worn in the inner race surfaces of
the cup or cone. The groove can be seen at the small or
large diameter end of both parts.
• Deep cracks or breaks appear in the surfaces of the cup,
cone, inner race, or rollers.
CRACK
Figure 6.2
• Bright wear marks appear on the outer surface of the roller
cage.
Figure 6.3
Copyright Meritor, Inc., 2022
WORN RADIUS
WORN SURFACE
1003017b
WEAR
GROOVES
1003018b
WEAR MARKS 1003019a
Printed in USA