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10 expert tips for long undercarriage service life, What is undercarriage wear – Liebherr L 556 User Manual

Page 14

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14 // Quarrying

Guide wheel, track rollers
and carrier rollers
Guide wheels and rollers tension and guide
the chain, also transversely. Wear occurs
on the running surfaces and at the side
walls.

Track shoes
The webs and the track shoes themselves
wear over the course of time, especially
on hard ground such as rocks.

Chain bushings
On an oil-lubricated chain, the bushing
moves relative to the sprocket. This causes
wear at the bushing and the teeth.

Rotating bushing chains roll freely from the
sprocket, reducing wear on the bushing
and the sprocket. Because of their form,
rotating bushing chains are only of limited
suita bility for tough operations where
impact stress occurs.

Sprocket
Once the sprocket has become completely
worn, teeth could break and the chain
could jump. An excessively worn sprocket
also increases wear on the bushings many
times over. For this reason, great attention
should be paid to sprocket wear.

Chain links
The chain links run over the guide

wheel, carrier rollers and track rollers.
Wear occurs on the contact areas. This
often occurs in the form of wave wear.

10 expert tips for long
undercarriage service life

Regular servicing and the right way of working have a great influence on the service life of the undercarriage.
On construction machines with chains, wear can occur in the chain bushings, sprockets, chain links, guide wheels,
track rollers, carrier rollers and on the track shoes. There are several different ways to prolong the service
life of the undercarriage and to reduce costs related to the undercarriage.

Tip 1:

On oillubricated chains, the bushing

can still be used if it is turned around 180°

in good time (with a wear level of 70 to 80 %). The
actual savings depend on the labor costs incurred.

What is undercarriage wear?

Tip 2: As a rule of thumb, the sprocket seg-
ments must not meet tooth tip to tooth tip. At

least a narrow web must be visible. Details of this can
be found in the operating handbook for the machine.

Tip 4:

It is especially important for the

under carriage to be cleaned in the winter. This

will prevent the carrier rollers in particular from sticking.
At the same time, cleaning will lengthen the service life.

Tip 5:

As an alternative to track shoes of

standard quality, Liebherr also offers special

track shoes that have more wearing material for high-
wear operations. Examples of such special track shoes
are “ES Extreme Service” or “SESS Super Extreme
Service Shoes.”

Tip 3:

If vibrations occur when the machine

is in operation, this might be caused by wave

wear on the chain links.

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