Liebherr TA 230 Litronic User Manual download pdf (Page 8)

14// Quarrying Quarrying //15

Service

The right machine configuration

A correctly configured undercarriage will

improve the performance capability of the

machine, especially in critical ground

conditions. At the same time, undercarriage

wear can be drastically influenced.

Fundamentally, crawler undercarriages

differ in the undercarriage length, the track

shoe width and the related track width. As

a general rule a shorter undercarriage will

provide greater manoeuvrability and higher

ground pressure on hard ground. For

optimum traction on normal hard ground

and the best possible levelling performance,

a long undercarriage with narrow track

shoes should be chosen. An extra-wide

undercarriage is used on less stable i.e.,

soft ground.

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 on the side

walls.

Track shoes

The webs and the track shoes 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 oil lubricated 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 labour costs incurred.

Travel speed

Excessively high speed, especially when

reversing, can lead to increased wear on all

components.

Cornering or working on a slope

Tight corners or frequent unnecessary

changes of direction when changing tracks

can cause increased wear, especially at the

side walls of the guide wheels, carrier rollers,

track rollers and on the chain.

Ground material

The type of ground material will have the

greatest influence on undercarriage wear.

Abrasive sand, for example, can cause

wear on a chain within a very short space

of time. In less abrasive materials (top soil,

loam, coal), the undercarriage will last

much longer.

What is undercarriage wear?

What influences undercarriage wear?

Working with the machine

Chain tension

Correctly setting the chain tension is a

basic requirement for optimal service life

of the undercarriage. Practical tests have

shown that the right chain tension can lead

to a service life of the bushing up to 75 %

longer than with the chain overtensioned.

The service life of the sprockets is also

lengthened accordingly. If the chains are

too loose, this could cause the teeth to

wear on one side of the sprocket.

On Liebherr crawler tractors under operating

conditions, the chain should hang down by

between 30 mm and 60 mm, depending on

the model, between the guide wheels and

Tip 6: In especially high-wear operations in

soft material, rotating bushing chains can

substantially increase the service life of the

undercarriage. Because of their form, these are

only of limited suitability for tough operations in

which impact stress occurs.

Tip 7: The chain tension can easily be

measured with a board or rod positioned

between the guide wheel and the first carrier roller.

Make sure that the machine is measured under

realistic operating conditions as the chain may be

additionally tensioned by the build-up of material

on the undercarriage.

Tip 8: In general, it is advisable to use a

centrally fitted chain guidance system with

crawler undercarriages. Such a chain guidance

system will absorb some of the lateral forces created

when steering or driving across a slope. Alternatively,

the undercarriage can be fitted with a continuous

chain guard that protects the entire undercarriage

against foreign bodies.

Check your speed

If the chains start to slip this will increase

wear on the track shoes. Drivers should

always adapt their travel speed and blade

load according to the operating conditions

in order to prevent the chains from slipping.

In addition, it should be checked whether

the webs on the track shoes are sufficiently

high to allow optimal traction. This will

greatly improve the pushing performance.

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 manual for the machine.

the carrier roller or between the carrier roller

and the gear ring. The correct chain tension

can be easily set with a grease gun. Please

refer to the operating handbook of the

construction machine for details. To prevent

injuries, it is important for the safety

instructions to be observed.

Tip 9: Freely variable or hydrostatic drive

systems allow travel speed to be optimised

by adapting to all operating conditions and types

of ground. Because the optimal travel speed can

also be set at full engine speed, there is always

sufficient tractive power available. The efficiency of

such drives is constantly high over the entire speed

range and no manual gear shifts are needed. That

makes fuel consumption especially low compared

to conventional construction machines.

Tip 10: For operations on hard or stony

ground, a suitably narrow track shoe width

should be selected as the chain could be damaged

by the lateral forces created when wide track shoes

are used.

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 our standard

quality of shoes, 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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Liebherr TA 230 Litronic User Manual Page 8

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