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.
Jim Strong
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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.
鈿欙笍 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.
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!
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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鈥檙e replacing. If the housing, flange, and ports are still in good condition, then there鈥檚 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鈥檛 package it properly, it can end up being damaged on the way to us.
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鈥檚 face it: if something's off with the final product, good luck figuring out which stop in that chain is responsible.
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When a final drive starts acting up, the instinct is to jump straight to "I need a new one." Sometimes that's true. Often it isn't. A weak charge pump, a clogged case drain filter, tracks set too tight, or a machine stuck in high-speed mode can all mimic final drive failure perfectly. And if you replace the drive without finding the real cause, you'll be back in the same spot in a few hundred hours, except now you're out the cost of a motor too.
This guide pulls together everything we've learned diagnosing final drives at 黑料社. From the questions to ask before you even open a toolbox, to symptom-by-symptom troubleshooting, to the tests our techs actually run in the shop, you can find information here. Whether you're running a single skid steer or managing a fleet, the goal is the same: figure out what's really wrong before you spend a dollar fixing it.
Your Bobcat is down, one final drive is toast, and now you've got three quotes in front of you: OEM from the dealer, a new motor from a parts supplier, and a remanufactured one for a lot less. They can't all be the same, so what are you actually paying for?
Every one of those three options can get your machine back to work. But they're not interchangeable when it comes to lead time, cost, and what's actually backing you up if something goes wrong. Here's what's really different, and how to pick the right one without overpaying or getting burned.
Here are a few other 黑料社 posts you might find of interest:
- Finding the Right Final Drive for Your Skid Steer or Compact Track Loader
- Bobcat Final Drives: Leaking Seals and Crossrobbing
- Bobcat Final Drive Basics
What "OEM" Actually Means (and What It Costs You)
OEM means the part came from Bobcat's own supply chain, carrying the Bobcat part number and built to the exact factory spec for your machine. There's no guessing on fitment, and for a machine still under factory warranty, it's often the only option that keeps that warranty intact.
Here's the catch: final drive motors aren't a part your dealer keeps ten of on a shelf. They're a special-order item on most models, and you can be looking at days to weeks of downtime waiting on a backorder. You're also paying full dealer markup, which is typically the highest of the three options by a wide margin.
OEM makes the most sense when:
- The machine is still under Bobcat's factory warranty and you need to preserve it
- You're required to use OEM parts for a fleet compliance or resale reason
- Lead time isn't your biggest constraint
Somebody's mad, and they have a right to be: just six months, maybe 400 hours, and their new final drive motor is acting up again. Did they buy junk?
Here at 黑料社, we regularly open up final drive motors and the story of the failure is almost always written inside the motor. It鈥檚 not usually a manufacturing defect or a bad reman job. It鈥檚 often debris from the first failure that鈥檚 still living in the machine and ready to chew through a perfectly good replacement.
There鈥檚 a good chance that the drive isn鈥檛 the root cause. The system may have failed and got a fresh drive to devour.
What a Failed Final Drive Motor Leaves Behind
When a final drive motor fails, it never fails politely. We regularly see bearing races spall, pistons scuff, and the rotary group grind itself down. And all that metal goes somewhere. Fine particles may ride the case drain line straight back into the tank. Bigger particles hang out in the hoses, the cooler, the valve block, and the low spots in the hydraulic reservoir.
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If you've ever popped the hood on a 100掳F+ afternoon and felt heat radiating off your machine before you even touched it, you already know what we're about to explain. That same kind of heat can affect your final drive motors, too. According to Brendan Casey in Machinery Lubrication,.
We鈥檙e going to talk about what's happening inside your final drive motor when it's this hot, and what you can do about it.
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What Does Heat Do to a Final Drive Motor?
Here's the simple version of what's happening 鈥渦nder the hood鈥�: is supposed to be thick enough to keep a protective film between all those moving metal parts inside your final drive (e.g., gears, bearings, the works). Think of it like the difference between spreading cold honey and warm honey. Cold honey holds its shape and coats things nicely. Warm honey runs thin and slides right off. Yourhydraulic fluid and gear oil do the same thing when the Texas heat gets into them: they thin out, and that protective film gets thinner right along with them.
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You鈥檙e wrapping up a long day when you notice something small, like sluggish travel speed, uneven tracks, or a dark spot under your machine. It鈥檚 easy to ignore, right? And doesn鈥檛 seem to be a big deal. It can wait a few days. But far too often, a few days turn into weeks and months, and minor issues turn into significant problems fast. And keep this in mind: Every minute of downtime, every drop of leaking fluid, and every bit of neglect quietly eats into your bottom line.
In this 黑料社 post, we鈥檙e going to look at five ways your mini excavator might be draining your wallet and what you can do about it.
Here are a few 黑料社 posts you might find interesting:
- Entrained Air: Basic Facts You Need to Know
- Advanced Reman and Repair Techniques for Final Drives
- The 8 Most Common Issues with Hydraulic Cylinders on Compact Equipment
Ignoring Track Tension
If you don鈥檛 keep the tracks on your compact excavator at the proper tension, there鈥檚 going to be some problems. If you keep them too tight, you鈥檙e going to see excessive wear on critical components like the sprockets and rollers -- and your final drive motors. On the other hand, if the tracks aren鈥檛 kept tight enough, the tracks are more likely to slip and risk derailing in the middle of a job.
It starts with noticing a small oil spot under your skid steer. You think, 鈥淚 can deal with that later,鈥� and before you know it, a week has turned into a month, and then, mid-job, your final drive motor seizes. Even the biggest leaks start small and always lead to expensive repairs or replacements.
Final drive leaks, whether it's your gear oil or hydraulic fluid, affect more than just fluid levels. If they aren鈥檛 addressed, they will lead to wasted money, lost productivity, and even totaled drive motors.
In this 黑料社 post, let鈥檚 break down why ignoring a final drive leak drains your wallet as well.
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