7 Bobcat Parts Mistakes That Cost Me $3,200+ (And How to Order Right)

Q1: How do I find the exact correct part number?

This was my first big mistake—October 2020. I ordered a ‘drive motor seal kit’ for a S650 based on the advice of a friend who’d worked on a T590. The gaskets were totally wrong. $340 down the drain, plus a 4-day wait for the correct kit.

The absolute first step is the serial number. It’s not usually visible, so:

• For most skid steers (S series, T series): open the rear door, on the frame by the oil cooler.
• For mini excavators (E series): on the right side behind the cab door, on a plate.
• Never trust the year model alone. Bobcat changes production specs mid-year frequently. I learned this hardest in 2021 when a ‘2020’ loader actually had parts from the 2021 spec.

Once you have the serial, use the official Bobcat Parts Catalog—either online or ask your dealer to run it. Don’t guess by machine model number alone.

Q2: Why does the new part not match the old one?

I once pulled an old hydraulic filter from a T740, cleaned it, and asked for ‘one of those.’ The parts guy handed me a new filter. It looked identical. But the thread pitch was slightly off. Assumption failure.

"Learned never to assume the proof represents the final product after receiving a batch that looked nothing like what we approved."

In May 2022, I ordered a wiring harness for the control panel of an E35 mini excavator. The old one had 16 pins; the replacement had 18. It physically plugged in but shorted two circuits. The result? $890 in repair plus a week of downtime. The lesson: compare part numbers to the latest revision chart, not to the physical part in your hand.

(Should mention: Many gasket sets and seals are superseded. Always check the Bobcat part number against the supersession list before you order.)

Q3: Is paying for genuine Bobcat parts always the right move?

In my first year (2019), I made the classic cost-saving mistake—I bought a $55 generic hydraulic pump seal for an S630 instead of the $125 genuine kit. It blew out in two months. The genuine one lasted 14 months so far. Simple? Yes.

Here is where I changed my view. Not every part needs to be genuine. For filters, some third-party brands (Wix, Fleetguard) meet or exceed OEM specs. For critical systems—pumps, final drives, electronic control units (ECUs)—genuine gives you the time certainty premium. You’re not paying for the sticker. You’re paying for the guarantee it fits first time.

In March 2024, we paid $400 extra for rush delivery on a genuine Bobcat ECU. The alternative was waiting 6 weeks for a rebuild from a specialist. That delay would have pulled a $15,000 contract. Worth it.

Q4: Can I trust a generic ‘replaces OEM’ hydraulic filter?

This is controversial among my crew. I have tried three non-OEM hydraulic filters on different machines. Two had clear bypass specs that matched OEM. One—for a brand T550—failed and dumped debris into the system.

My rule now: use only OEM or a brand I’ve validated with SAE J1197 test standards (which you can ask the supplier for a cert of conformance). If the vendor says ‘standard replacement’ but can’t give you the micron rating or the burst pressure number, it’s a red flag. To me, it’s better to pay $25 for a genuine Bobcat filter than $15 for the unknown.

Q5: I have an old 763 skid steer—are parts still available?

Bobcat is famously good for older models, but it’s not a blanket rule. In September 2022, I needed a final drive seal for a 1999 763. The dealer had no stock for a month. I sourced a used part from a salvage yard—cost $200 plus shipping—and it leaked from day one.

If your machine is 10+ years old, pre-check two things:

• Production end-of-life date for the part series (ask the dealer for the last production date for that specific serial range).
• Is there a superseded part number? If the OEM part is discontinued, is a cross-reference available? Bobcat frequently upgrades components (e.g., to a newer seal design) but the upgrade may require additional adaptors.

The question everyone asks is ‘Is the machine worth fixing?’ The question they should ask is ‘Can I still get the internal seal for the final drive in two years?’ If not, maybe it’s time to sell.

Q6: I need a backhoe attachment for my Bobcat—what’s the real cost of getting it wrong?

I once approved a used backhoe attachment for a T770 based on photos and a phone call with the seller. It physically fit the coupling plate. But the hydraulic flow was wrong. The machine’s aux flow was 30 L/min; the attachment required 40. We burnt out the valve block after 35 minutes of use. $1,400 repair, 3-day delay, angry client.

Before buying any attachment (especially a backhoe or auger):

• Get the machine’s hydraulic flow pressure and flow rate from the official Bobcat specification sheet (your dealer can print it).
• Get the attachment’s same spec from the manufacturer.
• Make sure the attachment’s coupler matches the Bobcat quick-attach system (most recent models use the standard flow).

The mistake cost $450 in redo plus a 1-week delay—and a hit to my credibility with the team. I should have paid for a site inspection call.

Q7: Why is my new attachment not getting power?

This one is the hidden killer. In January 2024, we purchased a brand-new Bobcat attachment (a compact trencher). It wouldn’t engage. The dealer tried to blame the machine. After three hours of diagnostics, the cause? The electrical harness connector on the attachment had a bent pin—one pin.

On newer Bobcat machines (S850, T870 post-2022), attachments communicate via the Bobcat CAN-Bus system. If the electrical harness isn’t fully seated, or a pin is broken, the entire attachment goes dead. Most operators think it’s a hydraulic issue.

My checklist now: before connecting any hydraulic line, inspect the 7-pin (or 12-pin) connector. Carry a spare pin kit (they’re cheap). This one caught 4 potential issues in 8 months—saved maybe $2,000 in wasted service calls.

"Why does this matter? Because a single damaged pin can cost you an entire day’s rental for a $50 repair."

So, after all that—what’s the single most useful tip I can give? Print out the correct part diagram for your specific serial number. Keep it in the manual. It has saved me from at least 47 errors in the past 18 months.