Shop Talk Blog

The Official Blog for Texas Final Drive

Bobcat S650 and T650 Final Drive Owner's Guide

Bobcat S650 and T650 Final Drives: An Owner's Guide

The Bobcat S650 and Bobcat T650 are everywhere. One is Bobcat's vertical-lift skid steer. The other is the track loader built on the same platform. Thousands of them are working today, and most will put in a decade or more before the final drives need attention.

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Skid steer next to some monster equipment

Monster Machines: The Biggest Shovels, Excavators, Dozers, Tractors, and Cranes on Earth

by Dr McCaslin | Oct 26, 2026 | |
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Every equipment owner has had the moment. You climb into your skid steer or mini excavator, feel the hydraulics come alive, and think, "This thing is a beast."


It is. But somewhere out there, in a mine pit, a cotton field, or a shipyard, there are machines so big they make your compact loader look like a toy in a sandbox. Let's take a tour of the heavyweights, the true monsters of construction and earthmoving.

The Hydraulic Shovel: Cat 6090 FS

Start with the hydraulic mining shovel, the machine that loads the haul trucks that are already the size of houses. Caterpillar's 6090 FS tips the scales at about 1,000 metric tonnes, or roughly 2.2 million pounds. Two Cummins QSK60 engines deliver a combined 4,500 horsepower, and the face shovel bucket holds 52 cubic meters (68 cubic yards) of material, with a payload of about 103 tons per scoop.

Here's the number that should make any hydraulics fan grin: the 6090 carries approximately 13,000 liters (about 3,450 gallons) of hydraulic oil. That's enough to fill more than 60 standard 55-gallon drums, all of it working to push, crowd, and curl one gigantic bucket.

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Man calculating which final drive motor option is best

OEM vs. New Aftermarket vs. Reman: Choosing Final Drives for a Rental Fleet

by Jim Strong | Oct 20, 2026 |

Reman Final Drives, Aftermarket Final Drives

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Once you've confirmed the final drive is the problem (see Is It Really the Final Drive?), the next question is what to replace it with. For a rental fleet, the answer depends on more than the price. It also depends on how quickly you need the unit back on rent, how long you plan to keep the machine, and whether it's still under factory warranty.

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Is is really the final drive motor?

Is It Really the Final Drive? Rule Out These Problems Before You Replace

A compact track loader comes back from rental pulling hard to the left. The final drive looks like the obvious cause, and swapping it seems like the fastest way to get the unit back on rent.

Sometimes that's the right call. But a new or reman final drive won't fix a weak charge pump, a clogged case drain line, a dragging parking brake, or a stuck two-speed valve. If the real cause is somewhere else, you've spent the money, the machine is still down, and the new drive may be damaged by the same problem.


Here's how rental fleet technicians can narrow down the cause before ordering parts. For a deeper look at symptoms, see our final drive diagnosis guide.

⚙️ Key Takeaways

  • Diagnose before replacing
  • Start by determining whether one side or both sides are affected
  • Check case drain restrictions, gear oil condition, brake release, two-speed operation, and case drain flow before condemning the drive.
  • Finding and correcting the root cause helps rental fleets avoid unnecessary parts costs, repeat downtime, and damage to replacement drives.

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Final Drive Checks at Machine Return

Final Drive Checks at Machine Return: A Rental Fleet Inspection Guide

Every rental return is a chance to catch a final drive problem while it's still small. Once the machine goes back out, you're relying on the next renter, who doesn't know the machine's history, to notice a slow leak or a new noise. Usually they don't, until the machine stops on their job.

A short final drive check at check-in costs a few minutes of a technician's time. Skipping it can mean an emergency service call, a machine off rent, and an unhappy customer. Here's a practical check-in routine for compact track loaders, skid steers, and mini excavators from Bobcat, Kubota, John Deere, and other brands.

Why Final Drives Deserve Their Own Line on the Check-In Sheet

The final drive takes everything a renter does. That includes overloading, counter-rotating on concrete, running with packed tracks, and operating in mud and standing water. Renters don't own the machine, so they rarely report early warning signs.

In our experience, most premature final drive failures trace back to a few maintenance items: a clogged case drain filter, low gear oil, or gear oil that wasn't changed often enough. We cover this in Maintaining a Bobcat Final Drive. All three can be caught on a regular schedule, and a rental yard's check-in process is the natural place for that schedule.

The 10-Minute Final Drive Check-In

1. Clean before you look

Pressure-wash or scrape the final drive area first. Packed mud hides leaks, and it gets into the gear housing when you open the fill plugs -- and an excessive build up can even force the face seals apart. Also clean around the plugs before you open anything.

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When to repair or replace your final drive motor

Final Drive Failure Guide: When to Repair or Replace

Experts recommend you repair when your damage is localized to components like seals, bearings, or minor internal components, if the housing/case is undamaged and downtime permits a teardown.

Replacement makes sense when a catastrophic planetary gear failure occurs, the outer case or main shaft is destroyed, metal contamination has flooded the hydraulic system, or minimizing machine downtime is the top priority.

In this Shop Talk Blog post, let’s talk about why this approach is recommended.

Key Takeaways: Final Drive Failure Guide

Quick diagnostic decision framework for deciding whether to repair or replace your final drive motor based on Texas Final Drive technical guidelines.

  1. 1. Perform a 4-Step Diagnostic Check Before Deciding

    Before jumping to replacement, evaluate the drive using four critical factors: extent of physical damage, estimated downtime, total repair costs, and remaining machine lifecycle.

  2. 2. Minor Issues Are Candidates for Repair

    If damage is isolated—such as worn face seals, minor bearing wear, or simple hydraulic leaks—repairing or rebuilding the motor is usually the most cost-effective option.

  3. 3. Catastrophic Internal Damage Warrants Full Replacement

    When severe damage occurs—like shattered planetary gear sets, cracked main housings, or total piston metal-on-metal lockups—replacement is safer, faster, and cheaper than replacing individual internal components.

  4. 4. Factor in the Cost of Downtime, Not Just Parts

    A new or remanufactured final drive motor ships immediately, eliminating expensive jobsite downtime compared to waiting days or weeks for shop tear-downs and specialized parts.

When a final drive motor fails, the work it was doing literally comes to a stop. That downtime is expensive in more ways than one: there’s the lost productivity, repair costs, the potential for missed deadlines, and even the possibility of losing customers. That means one approach to determining if you should repair or replace a final drive is how much downtime you can absorb.

If you have plenty of time and the damage isn’t severe, you can repair your final drive motor. However, if time isn’t on your side or the damage is extensive, then you should probably be looking at a replacement final drive motor. And remember, there are some types of damage that just can’t be repaired. We usually refer to that kind of issue as a catastrophic failure.

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What to do before sending in your final drive core

What to Do Before Sending in Your Final Drive Core

To prepare a final drive core for return shipping, confirm you have the right unit, leave it assembled, drain the hydraulic fluid and gear oil, cap all ports, secure loose parts, photograph everything, include your paperwork, and package it to support the full weight of the drive. To learn, keep reading!

Here are a few other blog posts you might be interested in:

When you purchase a new or reman final drive, you have to remove the old one. The term core refers to the used final drive you’re replacing. If the housing, flange, and ports are still in good condition, then there’s a good chance the old final drive can be remanufactured. Even if they don't appear to be in good condition, snap a few pictures and send them to the experts. The core may still be salvageable! However, if you don’t package it properly, it can end up being damaged on the way to us.

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Compact equipment preventative maintenance and service checklists

Compact Equipment Preventative Maintenance and Service Checklists

Preventative maintenance can transform an unexpected, costly, reactive repair cycle into a predictable, proactive management strategy. Is it worth the trouble, though? We think so. That’s why we prepared suggested maintenance schedules based on industry best practices.

Why Preventative Maintenance is Crucial to Your Equipment

Minimizing Downtime: An unexpected breakdown of a single primary asset (like an excavator) can stall an entire job site, leading to lost productivity costs of $450 to $760 per hour (for example), plus emergency technician travel and repair fees. It can also throw a job behind schedule, causing problems for your client and for your reputation.

Preventing "Domino-Effect" Catastrophic Failures: It’s a fact: seemingly minor, inexpensive maintenance failures can lead to very expensive component damage. For example, failing to replace a $20 case drain filter leads to line clogging, which spikes internal hydraulic pressure. That pressure spike will eventually blow out the main shaft seal, dilute your gear oil, destroy internal bearings/pistons, and can crack the cover plate. Failing to replace a $20 part can destroy a multi-thousand-dollar final drive motor.

Lowering TCO: Preventative maintenance reduces moving friction, which directly lowers fuel consumption, limits parts wear, and improves overall tractive effort. It also reduces repair costs and increases productivity.

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Using a hydraulic press to separate hubs?

Everything Under One Roof: Why We Do All Our Reman and Repair Work In-House

by Jim Strong | Aug 24, 2026 |

Reman Final Drives, Final Drive Repair

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If you've ever sent a final drive out for repair, you've probably lived through this at one point or another without realizing it: your unit gets diagnosed at one shop, shipped somewhere else for machining, sent to a third location for testing, and then routed back for final assembly before it ever heads your way. Every one of those handoffs adds days. Sometimes weeks. And every handoff is a place where accountability gets a little blurrier. Let’s face it: if something's off with the final product, good luck figuring out which stop in that chain is responsible.

Here are a few other blog posts you might find of interest:

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Charge Pump vs. Final Drive: How to Tell the Difference Before You Spend a Dime

You’ve noticed that your CTL seems weak or sluggish, or maybe it loses power under load. Your first instinct is probably to assume your final drive motor is shot … but is it? That assumption proves wrong more often than you might think. In fact, a quick phone call with a tech can save you a $3,500+ mistake.

This blog post goes in depth on charge pump issues, what the symptoms are, and how to tell the difference from a failing final drive.

Why the Confusion Happens

We’ve talked about this before: both a failing charge pump and a failing final drive motor can cause similar symptoms. A loss of power and sluggishness are both symptoms that final drives and charge pumps can share. Understandably, people usually default to the final drive motor because it's the more commonly known/talked-about component. However, the underlying cause and fix are very different. And that’s why it’s so important to get a proper diagnosis before you start ordering parts.

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Texas Final Drive, a division of
Woodland Fluid Power Inc
26639 Hufsmith Conroe Rd
Magnolia, TX 77354
281-968-4773 or 281-259-5267

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All manufacturers' names, symbols and descriptions are used for reference purposes only, and it is not implied that any part listed is the product of these manufacturers.

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© 2017 Texas Final Drive, a division of Woodland Fluid Power Inc – All Rights Reserved.

© 2017 Texas Final Drive, a division of Woodland Fluid Power Inc – All Rights Reserved.