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6
Prepare Parts for Assembly
• Bright wear marks appear on the outer surface of the roller cage.
WEAR MARKS
Figure 6.3
• The rollers and surfaces of the cup and cone inner race touching
the rollers are damaged.
ETCHING AND PITTING
Figure 6.4
• The cup and cone inner race surfaces touching the roller are
damaged.
SPALLING AND FLAKING
Figure 6.5
2.
Inspect the gears for wear or damage. Replace worn or damaged
gears.
3.
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.
4.
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.
MM-2034 / Issued 02-21
Page 23
5.
Verify oil passages in the shafts are clean and free of debris.
6.
Inspect the declutch and output shaft components, if applicable:
a.
Inspect the clutch collar internal splines, external declutch
teeth and shift for grooves. Replace worn, cracked, or
damaged collars.
b.
Inspect the pads of the shift fork for wear. If the pads are
worn, replace the shift fork.
c.
Inspect the declutch shaft and yoke for wear, stress and
cracks at the splines, shaft and yoke ears. Replace worn or
cracked shafts and yokes.
d.
Inspect the declutch or PTO push rod and piston for wear or
damage. Replace worn or damaged parts.
7.
Inspect the rotor, housing, and idler of the oil pump, if equipped,
for scoring. Inspect the drive tab of the rotor assembly. Inspect
the splines on the pump inner rotor for cracks along the spline
area. Also, check for excessive wear. Replace the pump if these
conditions exist.
8.
Remove and inspect the plug at the end of the input shaft. Verify
the orifi ce is clear of debris.
Helical Gears
Inspect the helical gear teeth, splines and journals. If any of the follow-
ing conditions exist, replace the gear.
• A crack in the root of a tooth or along the tooth fl ank.
Figure 6.6
• Severe spalling or fretting on the surface of a tooth. Gears
with spalling and fretting on the teeth, but without cracks, may
continue to operate satisfactorily with higher noise.
Figure 6.7
Copyright Meritor, Inc., 2021
CRACK
SPALLING
Printed in USA
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