Excavator Undercarriage Replacement Cost: What to Expect in 2026

Undercarriage replacement is the largest single maintenance cost on any tracked excavator. On a mid-size machine it can run $20,000 to $35,000. On a large production excavator it can top $60,000. Knowing what is involved and what it should cost keeps you from getting caught off guard and helps you decide whether a repair makes sense for the machine you have.

What a Full Undercarriage Replacement Includes

The undercarriage is not one part. It is a system: tracks (links and shoes), rollers (top and bottom), idlers (front), and sprockets (rear). A full undercarriage replacement means all of these components at once.

Shops measure undercarriage wear as a percentage of remaining life. Most recommend a full replacement when any major component drops below 30 percent. At that point, replacing just one item leaves the others close behind, and the labor cost of doing the work twice (track change now, rollers in 600 hours) outweighs the parts savings.

Typical Cost Ranges by Excavator Class

Shop rates in the Southeast run $125 to $175 per hour. Parts cost varies significantly by machine class and whether you use OEM, quality aftermarket, or a track package from a supplier like TBC or Berco.

Machine Class	Example Models	Labor Hours	Parts Cost	Total Estimate
Mini (under 6 tons)	Bobcat E35, Kubota KX040, Cat 305	8-14 hrs	$2,500-$5,500	$3,500-$7,900
Small (6-13 tons)	Cat 308, JD 75G, Kubota U55	12-18 hrs	$5,000-$10,000	$6,500-$13,200
Mid-size (13-25 tons)	Cat 320, Komatsu PC200, JD 210G	16-24 hrs	$11,000-$22,000	$13,000-$26,200
Large (25-45 tons)	Cat 336, Volvo EC350, Komatsu PC360	22-36 hrs	$22,000-$45,000	$24,700-$51,300

Full replacement: tracks, rollers, idlers, and sprockets. OEM parts push the upper end. Quality aftermarket (Berco, TBC, Titan) is 20-35% less. Partial replacement (tracks only, keeping good rollers/idlers) reduces cost by 30-45%.

Partial vs. Full Replacement

If your tracks are worn but your rollers and idlers are still at 60 percent or better, a track-only replacement is reasonable and significantly cheaper:

• Tracks only (links and shoes): Roughly 50-60% of a full replacement cost. Appropriate when rollers and idlers are still in good shape.
• Rollers only: A bottom roller is $100-$400 each depending on machine class. Replacing individual failed rollers before they damage the track is the cheapest path on a machine not yet at end-of-undercarriage-life.
• Full replacement: Best value when the whole system is worn, or when one component failed and the rest are at 40 percent or less. One mobilization, one labor charge, done.

What Accelerates Undercarriage Wear

Two machines of the same model and hours can have very different undercarriage remaining. The job it does matters:

• Abrasive material: Rock, gravel, and concrete demolition debris eat tracks and rollers faster than clean dirt. A machine that has worked in limestone all its life shows wear 30-50% faster than one used in clay soils.
• Track tension: Too tight causes premature wear on pins and bushings. Too loose causes track derailment and accelerates shoe wear. Most machines need tension checked every 250 hours.
• Counter-rotation (spin turns): Spinning in place puts the highest stress on pins, bushings, and sprockets. Wide turns are far easier on undercarriage.
• High-speed travel on pavement: Tracking machines on pavement over distances wears the shoes and bushings faster than working in dirt.

How to Tell What Your Undercarriage Has Left

A shop can measure undercarriage wear in about 30 minutes. They check bushing wear, link rail wear, track shoe thickness, roller and idler wear, and sprocket tooth profile. The result is a percentage remaining for each component.

For sellers: a documented undercarriage measurement justifies your price in a negotiation. A buyer who can see 65 percent remaining on a measured report has no legitimate basis to subtract a replacement cost from the offer.

For buyers: always ask for undercarriage measurement on any tracked machine. If the seller cannot provide it, budget for a measurement before you finalize a number.

Does the Repair Make Sense?

A $20,000 undercarriage replacement on a machine worth $45,000 with 5,000 hours and good components everywhere else is usually the right call. The same repair on a machine worth $18,000 with 9,000 hours and an engine coming due is a harder conversation.

Before committing to any major repair, know what the machine is worth. Get a free valuation on EquipBook: trade-in, private party, and dealer retail in under 60 seconds. Compare that number to your repair estimate and make the call with real data.

Want a ballpark on the undercarriage cost before you call a shop? EquipBook's free repair cost estimator covers undercarriage replacement across all major excavator makes and classes.