Spicer Drive Axles Failure Analysis Service Manual - Manual (Page 44)

Two Speed Planetary
43
Wear and Scoring
Clutch Plate - Improper Shift Sliding Clutch - Improper Shift
Bronze Idler Pins - Normal/Excessive Wear Bronze Idler Pin - Scoring
General Description:
Clutch plate and gear wear: Improper shifting and excessive periodic shock loads result in wear on
the teeth of the sliding clutch gear and mating plate.
Scoring: Incorrect lubrication or contaminated lube can cause etching, scoring, or pitting to the contact
surface of bearings, gears, bushings, and thrust washers. Foreign materials in the lube act as an abra-
sive weakening the protective film and resulting in seizure of mating parts.
Usual Causes:
Clutch Plate and gear wear:
• Improper shifting
• Excessive shock loads
Scoring:
• Incorrect lubrication
• Contaminated lube
Failure Prevention:
• Maintenance, Rebuilding, and Adjustment - see Failure Prevention Section.
Crack
Worn teeth
Normal
wear
Excessive
wear
Eccentric wear