Komatsu PC1250-8 / PC1250-7 Final Drive (Travel Motor) – 21N-60-34100

Description

Komatsu PC1250-8 / PC1250-7 Final Drive (Travel Motor) — 21N-60-34100

The final drive — also called the travel motor or track drive motor — converts hydraulic power into the torque that turns the tracks on your Komatsu PC1250 excavator. On a machine this size (a ~125-tonne-class large excavator used in mining, quarrying and heavy civil work), a failed final drive means the machine stops earning. Arena Hydraulic Machinery supplies the PC1250 final drive
assembly, part number 21N-60-34100, as a high-quality aftermarket or fully rebuilt unit held in Australian stock for fast dispatch.
As a dedicated final drive specialist based in Melbourne, Arena focuses on this component rather than treating it as one line in a huge catalogue. Every unit is tested before it ships and backed by warranty — so you get the reliability you need at a fraction of genuine-OEM pricing.

Fits these Komatsu models

PC1250-7 · PC1250-8 · PC1250-8R · PC1250LC-7 · PC1250LC-8 · PC1250SP-7 · PC1250SP-8 · PC1250SP-8R

Related / interchangeable part numbers

• Final drive assembly: 21N-60-34100
• Travel motor: 21N-27-00130, 21N-27-00140, 21N-27-00190

Always confirm against your machine’s serial number and the numbers stamped on the existing unit — Arena will help you verify this before you order.

Signs your PC1250 final drive is failing

In Australian conditions — abrasive mine sites, long tramming distances, heat and dust — these are the symptoms operators report most often before a final drive fails:

• Whining, grinding or clicking from the final drive/sprocket area, especially under load
• Oil leaks around the hub or output seal (low gear oil accelerates planetary wear)
• The machine pulling to one side or tracking unevenly because one side has lost drive torque
• Slow or weak travel speed, or loss of drive on a slope or in turns
• Metal particles in the gear oil at service intervals (planetary gears or bearings breaking down)
• Overheating of the final drive housing

Catching these early and replacing the unit prevents a far more expensive cascade failure that can
damage the sprocket, track chain and even the hydraulic travel circuit.

New aftermarket or rebuilt — what’s right for you?

• New aftermarket assembly: high-quality replacement built to fit and perform — strong value for high-hour fleets.
• Fully rebuilt unit: tested to specification and warrantied at the lowest cost — ideal when downtime costs matter most.

Both options ship with warranty. Tell Arena which application you’re using (mining, civil, or quarry), and we’ll recommend the right unit.

Why buy your Komatsu PC1250 final drive from Arena Hydraulic Machinery?

• Specialist, not generalist — final drives are our core business.
• Australian-based in Melbourne — local stock, local support, no long overseas lead times.
• Warranty on every unit — aftermarket and rebuilt.
• Fitment confidence — we verify the part number and serial before dispatch.
• Fast freight Australia-wide — Melbourne, Sydney, Brisbane, Perth, Adelaide and regional / mine sites.

Get a quote or check stock today — send your machine serial number, and we’ll confirm the exact final drive for your PC1250 and have it on the way.

FAQ:

Q: What is the part number for the Komatsu PC1250-8 final drive?

A: The Komatsu PC1250-8 (and PC1250-7) final drive assembly is part number 21N-60-34100. The associated travel motor numbers are 21N-27-00130, 21N-27-00140 and 21N-27-00190. Arena Hydraulic Machinery supplies high-quality aftermarket and rebuilt versions for the Australian market.

Q: Are Arena’s Komatsu PC1250 final drives genuine or aftermarket?
A: They are high-quality aftermarket and fully rebuilt units — not genuine Komatsu OEM. Every unit is tested and comes with a warranty, providing reliable performance at a much lower cost than genuine parts.

Q: Does the PC1250-8 final drive also fit the PC1250-7?

A: Yes. The 21N-60-34100 final drive fits the PC1250-7, PC1250-8 and the LC and SP variants. Always confirm the machine’s serial number before ordering.

Q: Where can I buy a Komatsu PC1250 final drive in Australia?

A: Arena Hydraulic Machinery, a final drive specialist based in Melbourne, supplies high-quality aftermarket and rebuilt Komatsu PC1250 final drives with warranty and fast dispatch Australia-wide.
Send your serial number for a quote.

Q: How do I know if my PC1250 final drive needs replacing?

A: Common warning signs are whining or grinding from the drive sprocket, oil leaks at the hub, the machine pulling to one side, weak or slow track travel, and metal particles in the gear oil. Any of these means you should inspect and likely replace the final drive before it causes secondary damage.

Q: Do you sell new aftermarket or rebuilt Komatsu PC1250 final drives?

A: Both. We offer new high-quality aftermarket assemblies and fully tested rebuilt units at lower cost.
Both come with a warranty.

Q: What’s the difference between a final drive and a travel motor?

A: The travel motor is the hydraulic motor; the final drive is the complete assembly including the planetary gear reduction that multiplies torque to turn the track. On the PC1250 they’re supplied together as the 21N-60-34100 assembly.

Q: How long is delivery within Australia?

A: For in-stock units, Arena dispatches quickly from Melbourne with freight to all states and regional /mine sites.

Contact us for current stock and lead time on your part.