Home > Products > Undercarriage

DuraTrack excavator track chain, 40 link assembly

DuraTrack Undercarriage

Excavator Undercarriage Parts

The DuraTrack range comprises crawler undercarriage components manufactured in OEM production facilities to rigorous OEM standards. All DuraTrack products are fully tested and inspected to ensure correct fitment, durability, consistent quality and assured performance.

The range covers excavators of all major makes: track chains and assembled track groups, track shoes, sprockets, bottom and top rollers, idlers, track adjusters and hardware. The undercarriage wears as one system, so measure every component before you buy. Dozer parts are on the dozer undercarriage page.

Single components, half kits, full kits or a complete undercarriage
Custom track groups assembled in our Houston workshop
Manufactured to OEM specification in ISO 9001 approved facilities
Held in US stock, same-day shipping on a 4:00pm CT cut-off

Shipping & Warranty

Order by 4:00pm CT and stocked parts ship the same day. All DuraTrack components come with a minimum 12-month warranty as standard; we confirm the term for your parts when we quote.

Get a Quote

Undercarriage Parts by Component

Nine wearing components, each manufactured to OEM specification. Select a component to browse parts by machine make and model.

Track Chains

101mm to 260mm pitch

Greased and sealed excavator chains with polyurethane seals from 140mm pitch, dry chains below. Easy fit and press fit master pins.

Track chains Browse track chains by machine

DuraTrack track group, chain with steel shoes fitted

Track Groups

Chain and shoes, assembled to order

Fully assembled track groups with customized chain and track shoe configurations, assembled in our Houston workshop. All 101.6mm pitch chains are supplied as welded groups.

Track groups

DuraTrack triple grouser steel track shoe

Track Shoes

300mm to 1200mm triple grouser

Heavy duty rolled Boron steel profile, through hardened and stress relieved, for standard, heavy-duty and LGP applications.

Track shoes

Sprockets

1 to 50 tonne machines

Cast steel with external tooth profiles induction hardened to over 50RC for extended wear life.

Sprockets Browse sprockets by machine

DuraTrack bottom track roller, double flange with mounting brackets

Bottom Rollers

Single and double flange

Engineered to transfer machine weight through the undercarriage to the ground. Forged roller shells, heat treated, on hardened forged alloy or rolled carbon steel shafts.

Track rollers Browse bottom rollers by machine

Top Rollers

Carrier rollers, including shaft type

Guide the track over the undercarriage frame. Reinforced flanges and heavy-duty sealing systems extend wear life. Single flange, double flange and shaft type.

Carrier rollers Browse top rollers by machine

Idlers

Complete cast assemblies

Cast idler assemblies produced to OEM specification, complete with heavy-duty seals, shafts and brackets.

Idlers Browse idlers by machine

DuraTrack track adjuster recoil spring assembly with yoke

Track Adjusters

Recoil spring assemblies, nearly 300 excavator models

OEM specification track adjuster assemblies for all major excavator models: tensioning piston, spring pack and yoke, available from stock.

Track adjusters Browse track adjusters by machine

Sprocket segments bolted together, with a segment bolt and nut

Hardware

Grade 12.9 and 10.9, metric and imperial

Track bolts and nuts to Grade 12.9; sprocket and roller bolts to Grade 10.9. All forged from alloy steel and heat treated to OEM standards.

Undercarriage hardware

Browse All Undercarriage Parts by Machine

Dozer undercarriage, SALT chains and conversion kits have their own page: Dozer undercarriage.

Undercarriage Wear and Measurement

Each wearing component sets the wear rate of the components it runs against. A worn sprocket shortens the life of a new chain, and one new roller among worn ones wears faster than the set it replaced. Four measurements determine most replacements: chain stretch, rail height, grouser height, and roller and idler tread wear.

Chain stretch. Measured across four or five pin centers against the new specification. On a 50 link chain, 1mm of pin wear plus 1mm of bush wear adds around 100mm to the overall length.
Sprocket wear. Compared against an unused sprocket of the same type. Sharp or hooked teeth let the chain jump, which shock loads the final drive.
Rollers. Change all bottom rollers together. One new roller among worn ones stands proud and carries more than its share of the load.
Shoe width. Use the narrowest shoe that still gives adequate flotation. Excess width accelerates bush, sprocket, link and roller wear and loosens hardware.

Four operating habits extend undercarriage life: dig over the idlers rather than the sprockets, keep the track correctly adjusted, keep the undercarriage clear of packed material, and reverse as little as the job allows. Excavator chains are designed to wear less travelling forwards.

What we need to identify your undercarriage

Make, model and serial number; number of track rollers and carrier rollers; number of links in the chain; number of grousers on the shoe; track shoe width in mm; and any markings cast into the links, rollers, idlers or sprockets. Parts are not interchangeable between models, or often between serial number ranges of the same model, so the more of this you can send, the faster the quote comes back.

How to measure grouser height

Clean two grousers and the pad surface between them. Lay a ruler across the top of the two grousers over the middle of the shoe, not the ends, which carry extra wear. Measure from the ruler down to the base of the pad with a second ruler or, preferably, a vernier. That figure gives the wear percentage of the shoe and grouser bars.

Stock, Quality, Shipping and Warranty

Large Stock Availability

A complete range of DuraTrack undercarriage components held in US stock to suit all makes and models of excavator, maximizing machine uptime.

Quality Approved

Manufactured to OEM specification in ISO 9001 approved facilities.

Same-Day Shipping

Order by 4:00pm CT and stocked parts ship the same day from US stock.

Warranty Backed

All DuraTrack components come with a minimum 12-month warranty as standard.

BSI certified ISO 9001, ISO 14001, ISO 27001 and ISO 45001

Undercarriage Services

Track group assembly, repairs and conversions from our Houston workshop.

Measure Before You Buy

Measure each undercarriage component against new dimensions before you buy, so parts are changed once, together, rather than twice. Our team will tell you what to measure.

Talk to the team

Houston Workshop

Custom track groups assembled to order, new chains bolted on new shoes, pad swaps, track repairs and repair sections, on 4 track presses.

Workshop services

Conversions and Local Delivery

SystemOne™ and Komatsu PLUS conversions and custom undercarriage solutions. Same-day pickup and local delivery are available on many orders throughout greater Houston.

Conversions and repairs

Undercarriage Questions, Answered

What parts make up an excavator undercarriage?

The wearing parts are the track chain, the track shoes bolted to it, the sprocket that drives it, the idler that guides and tensions it at the front, the bottom rollers that carry the machine's weight, the top rollers that support the top run of track, the track adjuster that keeps tension, and the bolts and nuts that hold it all together. Track guides are fitted on some machines to stop the chain moving sideways.

Should I replace the whole undercarriage or just the worn part?

It depends on what the measurements say. A new chain fitted to worn sprockets wears faster, and a single new roller among worn ones wears faster than the set it replaced, so parts that touch each other are usually best changed together. Where only one component is at its limit, that component can be replaced on its own. Measuring each component against new dimensions shows which parts are due.

Half kit, full kit or single parts?

If more than one component is close to its wear limit, a kit means the components wear uniformly from the same starting point and the machine comes off the job once rather than repeatedly. A half kit is typically the track groups and sprockets with their hardware; a full kit adds the idlers, top rollers and bottom rollers. Send the wear measurements and we will confirm which parts are due.

Why does my machine keep throwing a track?

Detracking is normally a symptom rather than a fault in the track itself. The usual causes are a loss of tension from a failed track adjuster, worn sprockets, rollers or idlers, material packed in the undercarriage, the wrong pitch fitted, and working habits such as consistently turning in one direction or running across a side slope. Track guards help where the chain is moving sideways.

What warranty comes with undercarriage parts?

All DuraTrack components come with a minimum 12-month warranty as standard. We confirm the term that applies to your parts when we quote them.

Do you assemble track groups in the US?

Yes. Custom track groups are assembled to order in our Houston workshop, which has 4 track presses and handles new chains bolted on new shoes, pad swaps, track repairs and repair sections. Same-day pickup and local delivery are available on many orders throughout greater Houston.

How fast can you ship undercarriage parts in the US?

Order stocked parts by 4:00pm CT and they ship the same day from US stock. If a part for your machine is not in stock we confirm the lead time when we quote, before you commit.

Do you supply mini excavator undercarriage?

Yes. The DuraTrack mini undercarriage range covers rollers, idlers and sprockets, and steel and rubber tracks, for mini excavators from 0.8t to 9t. TerraTrack rubber tracks are supplied from 180mm to 915mm wide.

Get a Quote for Undercarriage Parts

Send the machine make, model and serial number, with the roller count, link count and shoe width if you have them. We check the parts against our product reference guide, price them, and ship from US stock.

Speak to the Team

Technical advice on identifying undercarriage parts comes at no additional cost.

Call Us

Testimonials

★★★★★

The speed of processing the order and delivery.

Daniel Fairer

Holcim Group Services Ltd

★★★★★

The service is great and Dean always delivers what he promises, quotes are quick and the response on delivery times is great.

Anthony Lane

Chippindale Plant

★★★★★

Very friendly and helpful staff. Very knowledgeable and gives great advice.

Dave Bible

Moss Civils

★★★★★

Ordered, on site, fitted and machine back in use within 24 hours. Great service, good communication and good paperwork.

George Hammersley

Roddenloft Estates