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Terrapart

Excavator Final Drives & Travel Motors

Astrak supplies Terrapart final drive motors for excavators and other tracked equipment from 1t to 50t. Manufactured to OEM specification, each drive is thoroughly inspected and tested to ensure correct fitment and performance, and backed by a warranty of up to 24 months. More than 5,000 final drives are listed online by machine make and model, and stocked units ship the same day when ordered by 4:00pm CT.

Final drives for mini excavators, midi excavators and large excavators, and for other tracked equipment
Many drives manufactured by leading OEM suppliers including Eaton, Doosan, Nabtesco, Brevini and Trasmittal Bonfiglioli
A cost-effective alternative to the dealer-branded drive
Same-day shipping on stocked units, 4:00pm CT cut-off

Shipping & Warranty

Order by 4:00pm CT and a stocked final drive ships the same day. Final drives carry a warranty of up to 24 months, and every Terrapart hydraulic component carries a minimum 12-month warranty and 30-day returns. We confirm the term for your drive when we quote. The warranty depends on correct installation: incorrect piping will result in non-warranty failure, which is why installation instructions are supplied with the drive.

What we need to identify your drive

The machine type, model and serial number, whether the existing drive is single speed, and a clear photograph of the tag plate on the motor side of the drive. Where the tag is missing we work from the check sheet.

Single speed or two speed?

All of our drives are two speed. On a single-speed machine the second-speed port is simply not used: a hose is fitted from the free drain port to the second-speed port so that pressure cannot build up.

Final drive, travel motor or track motor?

The same part. Parts books and suppliers call it a final drive, a travel motor, a track motor or a final drive motor. Whichever term you use, the make, model and serial number identify it.

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Final Drives by Machine Make

Select a make to see every final drive we list for it, by model. Each page can be filtered by machine model. If your make is not shown, send us the model and serial number: the range reaches wider than this list.

Show 19 more machine makes

Have the part number rather than the machine? Browse final drives by OEM part number, covering Kayaba, Nabtesco, Nachi and Kawasaki motors and drives catalogued under the manufacturer's own number. Or browse the full final drives collection in one list.

How to Identify a Final Drive

The tag plate does most of the work. Send what you can and we confirm the rest before quoting.

What to send	Where to find it	Why it matters
Machine type, model and serial number	The manufacturer's data plate on the machine.	This is what we check against the product reference guide, so it is needed on every inquiry.
Tag plate photograph	On the motor side of the drive, the side facing inwards, opposite the sprocket. Usually behind a teardrop-shaped cover plate held on by three bolts. There are normally two tags, one on the gearbox side and one on the motor side.	A legible tag identifies the drive directly.
Hole count and bolt size, both flanges	Count equally spaced holes. Nine equally spaced plus one odd hole is reported as nine.	Frame and sprocket bolt patterns both have to match.
Single speed, yes or no	The machine's specification.	Decides whether the single-speed modification is made before shipping.

Scroll the table sideways to see every column.

Our hydraulics team checks every inquiry against the product reference guide before a drive is quoted, so a photograph of the tag and the serial number is usually enough.

Installing a Replacement Final Drive

A new drive installed into a contaminated system will not last. When a final drive fails, metal particles do not stay in the drive: they pass into the hydraulic circuit. Before installation, make sure the hydraulic oil is not contaminated with metal from the previous drive's breakdown. We strongly recommend a complete change of hydraulic oil and a new hydraulic filter when a final drive is changed.

Clean all dirt from the installation area, particularly around the hoses. Ingress of dirt will cause early failure.
The ports are color-coded on the installation instructions: blue for the drain ports, red for the second-speed port, green for the two main feed hoses. The main feeds are the two thickest hoses, and swapping them reverses the direction of travel.
The second-speed port is one fixed size. Use the fitting supplied, and do not exchange the valve.
Not sure which thin hose is the drain and which is second speed? With both in a bucket and the mains connected, run the engine at minimum speed and select second speed. The hose that squirts oil is the second-speed hose.
After installation, check the gear oil level and top up with SAE 85W/90 or standard gear oil. Run the machine forwards and backwards at minimum engine speed, then check the circuit pressure with a gauge against the machine manufacturer's specification.

Incorrect piping will result in non-warranty failure. If anything on the instructions is unclear, call before connecting a hose, not after.

Is the Final Drive Actually the Fault?

Several inexpensive faults mimic a failed final drive. Rule them out before condemning the unit.

Worn Sprocket

Sharp and worn sprocket teeth let the link slip or jump through the sprocket, and that shock loads the final drive motor. A new drive behind a worn sprocket is a short-lived repair, so check the sprocket first and change both where both are at their limit.

Excavator sprockets

Undercarriage components measured in situ

Track Tension and Undercarriage

An over-tight track robs the machine of power and loads every mating component, and worn rollers and idlers add vibration. Have the undercarriage measured and a wear report written up before anything is quoted, so the drive is not blamed for a track problem.

Undercarriage parts

Read the Signs

Grinding or clicking that is worst on a turn, oil behind the sprocket, brass or bronze in the gear oil, or a machine pulling to one side. Our guide explains what each symptom usually means and which ones are hydraulic rather than gear train.

Signs of failure in a final drive

Stock, Quality, Shipping and Warranty

Available From Stock

Most models available from stock, with more than 5,000 final drives listed by machine make and model, from mini excavator final drives to units for 50t machines.

OEM Quality

Manufactured to OEM specification, with many drives made by leading OEM suppliers. Each drive is thoroughly inspected and tested to ensure correct fitment and performance.

Same-Day Shipping

Order by 4:00pm CT and a stocked drive ships the same day.

Up to 24-Month Warranty

Final drives are backed by a warranty of up to 24 months, with a minimum of 12 months and 30-day returns across the whole Terrapart range. Shaped by 30 years of hydraulic expertise.

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

The Rest of the Terrapart Range

Final drives are one of four Terrapart component groups. All are manufactured to OEM specification with a minimum 12-month warranty.

Terrapart hydraulic pump for an excavator

Hydraulic Pumps

12-month warranty

Main pumps for excavators, including Kawasaki K3V and K5V units and pumps from Rexroth, Uchida, Hydromatik, Tong Myung and Mottrol.

Hydraulic pumps

Swing Motors

12-month warranty, stocked for 6t and larger excavators

Swing motors from Kawasaki, Toshiba, Shibaura, Tong Myung, Mottrol and Linde, as well as machine manufacturers' own brands.

Swing motors

Terrapart swing reducer for an excavator

Swing Reducers

12-month warranty

Swing reduction gearboxes from Kawasaki, Toshiba, Shibaura, Mottrol and Linde, and machine manufacturer brands.

Swing reducers

Final Drive Questions, Answered

What is a final drive on an excavator?

The final drive is the hydraulic motor and reduction gearbox at the drive end of each track. The sprocket bolts to it, and as the drive turns, the sprocket teeth engage the links in the track to move the machine. It is also called the travel motor, track motor or final drive motor. It is the same part.

Which machines do you supply final drives for?

Excavators and other tracked equipment from 1t to 50t. More than 5,000 final drives are listed online by machine make and model, covering makes including CAT, Volvo, Komatsu, Hyundai, Hitachi, Case, Doosan / Develon, Kobelco, Yanmar, Kubota, Bobcat, JCB, Takeuchi, New Holland, John Deere and Wacker Neuson. Select a make above to see every drive we list for it, or send us the model and serial number if yours is not shown.

What warranty comes with a final drive?

Final drives carry a warranty of up to 24 months, and every Terrapart hydraulic component carries a minimum 12-month warranty and 30-day returns. We confirm the term that applies to your drive when we quote it. The warranty depends on the drive being installed correctly: incorrect piping will result in non-warranty failure.

How do I identify which final drive I need?

Send the machine type, model and serial number, whether the existing drive is single speed, and a clear photograph of the tag plate. The tag sits on the motor side of the drive, the side facing inwards, opposite where the sprocket bolts on, usually behind a teardrop-shaped cover plate held on by three bolts. If the tag has gone, we work from the check sheet with you.

Are your final drives single speed or two speed?

All of our drives are two speed. On a single-speed machine the second-speed port is not used, and a hose is fitted from the free drain port to the second-speed port so that pressure cannot build up.

Do I need to change the hydraulic oil when I replace a final drive?

Yes. When a final drive fails, metal particles pass into the hydraulic circuit and will damage the replacement. We strongly recommend a complete change of hydraulic oil and a new hydraulic filter when a final drive is changed, and cleaning all dirt away from the installation area, particularly around the hoses, because ingress of dirt will cause early failure.

What oil goes in a final drive?

Top up the gearbox with SAE 85W/90 or standard gear oil. Check the level after installation and before the machine goes back to work. Change intervals are machine specific, so follow the operator's manual, and look at what comes out when you drain it: brass or bronze shavings are not normal wear debris.

What are the signs of a failing final drive?

Grinding or growling, clicking or knocking that is worst on a turn, oil behind the sprocket, brass or bronze in the gear oil, loss of travel power, and a machine that pulls to one side. Rule out the inexpensive causes first: loose sprocket bolts, over-tight tracks, worn rollers and idlers, and low hydraulic pressure or flow. A high-pitched whine is more often hydraulic than gear train.

Can a worn sprocket damage a final drive?

Yes. Sharp and worn sprockets let the link slip or jump through the teeth, and that shock loads the final drive motor. If the sprocket is hooked or pointed, change it with the drive rather than installing a new drive behind it.

How fast can you ship a final drive in the US?

Order a stocked final drive by 4:00pm CT and it ships the same day. If the drive for your machine is not in stock we confirm the lead time when we quote, before you commit.

Get a Quote for a Final Drive

Send the machine make, model and serial number, whether the existing drive is single speed, and a photograph of the tag plate if you can get to it. Our hydraulics team confirms the drive against the product reference guide, prices it, and ships from stock.

Speak to the Team

Technical advice on identifying a final drive comes at no additional cost. Shaped by 30 years of hydraulic expertise.

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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