Re: Crawler Undercarriage
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Posted by Stan Disbrow on June 01, 1998 at 14:54:53:
In Reply to: Crawler Undercarriage posted by Terry Tickle on June 01, 1998 at 11:57:54:
Terry, A crawler has pads mounted on large chains.
The chains are driven by a sprocket on the rear
and run under rollers at the bottom of the
carraige. There is a large idler wheel at the
front of the carriage, and possibly an upper
roller or two (depending on the track length).
The sprocket pulls the chain up at the rear
and sends it to the idler at the front, where it
is laid on the ground. All that said, there are hardened bushings in the
track chains, along with hardened pins.The pins
and bushings wear over time, as they are not
lubricated and are operated in the abrasive dirt
(or worse, acidic manure). There is always some
form of track tightenermechanism at the front of
the carraige that allows the large front idler to
be adjusted forward. This allows the chain to be
tightened to compensate for the pin & bushing
wear. If the chains are not kept tight, the track
is likely to be thrown off during a turn. OK, when someone quotes an undercarraige
percentage, they are usually referring to the
amount of tightening adjuster travel left. This
will give you an idea as to how much work you
might expect to obtain before having to replace
the pins & bushings in the track chains. Stan
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