Inspect Parts - Meritor MTC-4208X Series Service Manual

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.
1. 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.
WORN RADIUS
WORN SURFACE
• 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
Printed in USA
• Bright wear marks appear on the outer surface of the roller cage.
• The rollers and surfaces of the cup and cone inner race touching
• The cup and cone inner race surfaces touching the roller are
2.
WEAR
3.
GROOVES
4.
5.
Copyright Meritor, Inc., 2020
5 Prepare Parts for Assembly
WEAR MARKS
the rollers are damaged.
ETCHING AND PITTING
damaged.
SPALLING AND FLAKING
Inspect the gears for wear or damage. Replace worn or damaged
gears.
Inspect the housing.
a. Remove all dirt from the housing and oil lubrication
passages, troughs, slots, and holes.
b. Inspect machined surfaces for cracks and damage. Repair or
replace damaged parts.
Inspect all shafts, fl anges and yokes for wear, stress, and cracks
at the splines, shaft, and yoke ears. Replace worn or cracked
shafts, fl anges, and yokes.
Verify oil passages in the shafts are clean and free of debris.
MM-0861 / Revised July 2020
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