Gradall G-550C Operation And Maintenance Manual page 30

G-660C & G-880C GRADALL (Crawler)
The wear on sprocket teeth caused by increased track pitch is just one of the many type of sprocket
wear. The various types of wear can be identified by careful inspection of the sprocket teeth and
noting the location of the wear.
THE SIX MAJOR TYPES OF WEAR ARE:
SPROCKETS
KEEP THE CRAWLER ASSEMBLIES CLEAN
As the crawler is inspected and lubricated, inspect all
for dirt and clean out the dirt as needed. A feature of the
Gradall is it's ability to use down-pressure of the boom
to lift one track clear of the ground. With the track lifted
clear of the ground, the track can be rotated to help it
clean itself.
SPROCKET wear is effected by the loads imposed,
type of terrain, abrasiveness and moisture content of
the soil. Major improvements to track component
design, such as the hunting tooth sprocket and
machining of the sprocket teeth to control shape, root
diameter and backlash have greatly reduced this wear.
When sprocket teeth are so worn that replacement is
required, it is not necessary to replace the entire
sprocket assembly if the hub is in good condition. The
worn sprocket rim can be removed and a replacement
rim installed in its place. Properly attached to the
spokes of a good hub, the replacement rim can be
expected to give the same service life as a new
sprocket assembly.
The six major types of wear are:
1.
Drive Side Wear -when operating forward.
2.
Reverse Drive Side Wear - when operating in reverse.
3. Climbing Wear - result of increased track pitch.
4. Root Wear - when bushing elides from side to side.
5.
Rotative Wear - when bushing rotates as it leaves
(forward) or enters (reverse) the sprocket.
6.
Reverse Drive Side Tip Wear - when sprocket pitch is
greater than the track pitch.
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OPERATION & MAINTENANCE