03/11/2026
The Bobcat T740 is listed with one track size, 450 x 86 x 55B (450 mm / 17.7 in wide, 86 mm pitch, 55 links), in a C-lug or Z-lug tread for the solid-mount undercarriage. This guide covers how to confirm the fit, which undercarriage each part is listed for, the signs of wear and the T740 idlers and bottom rollers to check.
Ordering new tracks for a Bobcat T740 starts with the size, and our catalog lists one track size for this machine. This guide gives the Bobcat T740 track size, the two tread patterns it comes in, how to confirm the fit, which undercarriage each part is listed for, the signs that tracks are worn and the T740 idlers and bottom rollers worth checking while the tracks are off.
The short answer
Our catalog lists a single track size for the Bobcat T740 with the solid-mount undercarriage. Width, pitch and link count are fixed, so the only choice to make is the tread.
| Track size | Width | Pitch | Links | Tread |
|---|---|---|---|---|
| 450 x 86 x 55B | 450 mm (17.7 in) | 86 mm | 55 | C-lug |
| 450 x 86 x 55B | 450 mm (17.7 in) | 86 mm | 55 | Z-lug |
Source: Excavator Parts Direct catalog, November 2026. Solid-mount undercarriage. Sold as a single track (price is per track).
Read the size as width x pitch x links. A 450 x 86 x 55B track is 450 mm wide, has 86 mm between link centers and has 55 links. Both treads share these dimensions, so either one matches the size on the machine. If your old track shows a different size, check with us before you order.
If the size is still readable on the side of your old track, use it. If it has worn away, take three measurements:
Width
Measure across the track from edge to edge. A T740 track should measure 450 mm (17.7 in).
Pitch
Measure from the center of one link to the center of the next. The T740 track has an 86 mm pitch. Measure over several links and divide, which gives a truer figure than a single gap.
Links
Count the drive lugs around the inside of the track. The T740 track has 55. Mark your starting lug with chalk so you do not count one twice.
If your numbers match 450, 86 and 55, you have the right size. Our guide to measuring rubber tracks shows each step with diagrams.
Match the size
Compare the size on the old track, or your measurements, with the table above. If the pitch is not 86 mm or the link count is not 55, stop and check before you order.
Confirm the undercarriage
Our T740 track and idler are listed for the solid-mount undercarriage. Our T740 bottom roller is listed for the suspension-mount undercarriage. If you are not sure which undercarriage your machine has, contact us with the machine details and serial number and we will check.
Choose the tread
The T740 track is listed with a C-lug or Z-lug tread. The right one depends on the ground the machine works on most and the jobs it does. Fit two tracks of the same tread so both sides grip and wear evenly.
Look underneath first
Before the new tracks go on, inspect the sprockets, idlers and bottom rollers. New tracks on a worn undercarriage wear out sooner.
Our advice
A size that is checked, not guessed, is the quickest way back to work. If anything does not match, talk to the team before you order, so you maximize machine uptime and avoid a return.
These are the checks we recommend on any tracked machine, and they apply to the T740.
If the track keeps going slack after you adjust it, do not assume the track is the cause. A track adjuster with failed piston seals cannot hold tension, and worn sprockets can add to the problem. Here is how to check rubber track tension. The correct tension figure for the T740 is in your machine’s operator’s manual.
When sprocket teeth wear sharp, they stop holding the track cleanly. The track can slip or jump through the sprocket, and the shock load travels into the final drive. If you see or hear this happen, stop and inspect the sprockets before you carry on.
Deep cuts, missing lugs and steel cords showing through the rubber all mean the track is near the end of its life. A track in that state can fail without much warning, so plan the change before it does.
If a set of tracks wears out well before the last set did, look at the parts underneath before you fit new ones. Material packing between sprocket teeth, rollers and the track also speeds up wear, so keep the undercarriage clean. Our guide to spotting a worn sprocket shows what to look for, and these five tips to extend rubber track life cover other common causes.
Spinning the tracks, unnecessary reversing, high travel speed when it is not needed and always turning in the same direction all add wear. They wear the tracks and the sprockets that drive them.
With the tracks off, the whole undercarriage is in plain view. That makes a track change the best time to inspect it. Here is what our catalog lists for the T740:
| Part | Per machine | Undercarriage | Weight each |
|---|---|---|---|
| Idler | 2 | Solid-mount | 25.5 kg (56.2 lb) |
| Bottom roller | 10 | Suspension-mount | 25.8 kg (56.9 lb) |
| Drive sprocket | Not listed online: ask the team | Ask the team | Not listed |
Source: Excavator Parts Direct catalog, November 2026. Kilogram weights converted from the catalog’s pound figures.
Idlers guide the track around each end of the track frame and work with the track adjuster to hold tension. Our catalog lists 2 per T740, for the solid-mount undercarriage. Check for worn running surfaces, damaged flanges and oil leaks. With an idler off, it is also the easiest time to check or replace the track adjuster.
Bottom rollers run along the underside of the track frame and carry the machine’s weight on the track. Our catalog lists 10 per T740, for the suspension-mount undercarriage. Look for flat spots, worn flanges, oil leaks and rollers that no longer turn, and check every one, including the rollers that are hard to see. We advise changing bottom rollers as a set, because a single new roller sits proud of the worn ones and wears faster. Our guide to track rollers explains each type.
The sprocket bolts to the final drive and its teeth engage the track to drive the machine. We do not currently list a T740 sprocket online. Sprocket wear is hard to judge by eye, so compare yours with an unused sprocket of the same type. Wear builds faster in reverse and at higher travel speeds. If yours are worn, contact us with the serial number and we will check what we can supply.
Our advice
If the idlers, rollers or sprockets show wear, replace them with the tracks. It is one job and one round of downtime, and the new tracks start on a sound undercarriage.
These are the T740 parts in our catalog. The track and idler are on the Bobcat T740 parts page for the solid-mount undercarriage. The bottom roller is listed for the suspension-mount undercarriage.
More Bobcat parts
Our catalog lists one track size for the Bobcat T740 with the solid-mount undercarriage: 450 x 86 x 55B. That is 450 mm (17.7 in) wide, with an 86 mm pitch and 55 links.
The T740 track in our catalog is 450 mm (17.7 in) wide.
It is the track size, written width x pitch x number of links. The track is 450 mm wide, has an 86 mm pitch and has 55 links.
Yes. Our catalog lists the 450 x 86 x 55B track for the T740 with a C-lug or a Z-lug tread. Tell us about the ground and the work, and we will help you choose.
Yes. We sell T740 tracks individually, and the price shown is for one track.
Our catalog lists the T740 track and idler for the solid-mount undercarriage and the T740 bottom roller for the suspension-mount undercarriage. If you are not sure which undercarriage your machine has, contact us with the serial number and we will check.
Our catalog lists 2 idlers per machine for the solid-mount undercarriage and 10 bottom rollers per machine for the suspension-mount undercarriage.
We do not currently list a T740 drive sprocket online. Contact us with the machine serial number and we will check what we can supply.
Common signs are a track that will not hold tension, a track that slips or jumps on the sprocket, deep cuts or missing lugs, steel cords showing through the rubber, and tracks that wear out much faster than the last set. Check the sprockets, idlers, bottom rollers and track adjuster at the same time, because worn parts underneath shorten the life of new tracks.
Related guides
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