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Terrapart final drive travel motor for an excavator

Terrapart Hydraulics

Excavator Final Drives & Travel Motors

Astrak supplies Terrapart final drives for excavators and other tracked equipment from 1 to 50 tonnes. 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 most models are available from stock.

Final drives for mini, midi and heavy excavators, and for other tracked plant
Many drives manufactured by leading OEM suppliers including Eaton, Doosan, Nabtesco, Brevini and Trasmittal Bonfiglioli
A cost-effective alternative to the manufacturer-branded drive
Next-working-day UK delivery on stocked units

Delivery & Warranty

Place your order before 4:30pm and a stocked final drive will be despatched for delivery on the next working day. Final drives carry a warranty of up to 24 months, and every Terrapart hydraulic component carries a minimum 12-month warranty. We confirm the term for your drive when we quote. The warranty depends on correct fitting: incorrect piping will result in non-warranty failure, which is why fitting 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 or a track 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 CE plate or manufacturer's plate on the machine.	This is what we check against the product reference guide, so it is needed on every enquiry.
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 despatch.

Scroll the table sideways to see every column.

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

Fitting a Replacement Final Drive

A new drive fitted 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 colour coded on the fitting 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 fitting, check the gear oil level and top up with SAE 85W/90 or standard gear oil. Run the machine forwards and backwards at minimum revs, 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 cheap 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. Our free undercarriage inspection measures the lot and gives you a written wear report before anything is quoted.

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, Delivery and Warranty

Available From Stock

Most models available from stock, with more than 5,000 final drives listed by machine make and model, and 95% of orders delivered on time and in full.

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.

Fast Delivery

Place your order before 4:30pm and a stocked drive will be despatched for delivery the next working day.

Up to 24-Month Warranty

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

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

The Rest of the Terrapart Hydraulics 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 6 tonne 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 or track motor. It is the same part.

Which machines do you supply final drives for?

Excavators and other tracked equipment from 1 to 50 tonnes. 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 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. We confirm the term that applies to your drive when we quote it. The warranty depends on the drive being fitted 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 fitting 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 cheap 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 fitting a new drive behind it.

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 despatches 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