Spicer Steer Axle Failure Analysis User Manual
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Bushing and Kingpin Wear –
Contamination
Grooving
Bushing – Clogged with Contamination
Kingpin – Grooving From Contamination
Rust, No Grease
Scoring, Rust
Bushing - Lack of Grease
Kingpin – Lack of Grease
General Description:
Rust, grooving and scoring to the bushing area of the kingpin, bushings excessively worn and contamination built
up in bushing.
Usual Causes:
x
Lack of Grease (Greasing intervals to infrequent)
x
Contamination Damage (Greasing not long enough to flush contaminants from kingpin joint)
x
Excessive Knuckle Vertical Play
x
Wrong Grease Type
Failure Prevention:
x
Grease intervals must be adjusted to match the environment of the vehicle. More contamination the more
you need to grease.
x
Greasing should continue until clean grease is seen coming from between the joints.
x
Knuckle vertical play should not exceed .040”.
x
Use # 2 lithium grease only.
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