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Swing Arm Bearing Wear; Swing Arm Lubrication; Pivot Shaft; Pivot Shaft Runout - Kawasaki KZ400 Service Manual

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21 2 MA1 NTENANCE-CHASSIS
end pivots on a shaft connected to the frame.
When
the rear wheel receives a shock, the swing arm, pivoting
on its shaft, allows the wheel to move up and down in
relation to the frame within the limits o f the shock
absorbers.
This motorcycle has needle bearings at the swing
arm pivot.
I f bearing wear has progressed such that
the swing arm has become loose, the motorcycle will
be unstable. To minimize wear, the swing arm should
be kept properly lubricated.
A bent pivot shaft or twisted swing arm will also
cause instability by throwing the rear wheel out of
alignment.
A bent pivot shaft may also cause bearing
seizure.
Swing arm bearing wear
Measure the outside diameter o f the swing arm
sleeve at both ends with a micrometer.
Replace the
swing arm sleeve if the diameter
is
less than the service
limit or i f i t shows visible damage.
A. Swing Arm Sleeve
Table J18
Swing Arm Sleeve
I
Service Limit
/
21.96 mm
1
The rollers in the needle bearings wear so little that
the wear is difficult to measure.
Instead, inspect the
needle bearings for abrasions, color change, or other
damage.
I f there is any doubt as to its the condition
o f either needle bearing, replace both needle bearings.
Whenever the swing arm sleeve i s replaced, also replace
the needle bearings.
Swing arm lubrication
There is a grease nipple on the swing arm for lubri-
cation.
Grease the swing arm with regular cup grease
as a part o f general lubrication (Pg. 3 3 ) with the fre-
quency given in the Periodic Maintenance Chart (Pg.
10). Force the grease into the nipple until i t comes
out at both sides o f the swing arm, and wipe off any
excess.
I f the grease does not come out, first check
that the nipple is not clogged with dirt or old grease.
I f the nipple it clear but still will not take grease; re-
move the swing arm (Pg. 1
SO),
pull out the sleeve, clean
out the old grease, and apply grease to the needle
bearings.
Pivot shaft
To measure the pivot shaft runout, set the pivot shaft
on V blocks at the end o f the pivot shaft, and set a dial
gauge to the shaft halfway between the blocks. Turn the
shaft to measure the runout.
The amount of runout
is the amount o f dial variation.
I f the shaft runout
exceeds the service limit, straighten it.
I f i t cannot
be straightened, or i f the runout exceeds the repair
limit, replace the shaft.
Pivot Shaft Runout
A. Grease Nipple
B. Grease.
A. Needle Bearing
B. Grease.
Table J19
Pivot Shaft Runout
I
Service Limit
Repair Limit
1

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Kz500Kz550

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