Field Case: 320D Alone Wasn't Enough — the Serial Number Nailed the Right Final Drive in 3 Days

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Case in one line: A customer in Africa had a CAT 320D with noisy travel. His first inquiry said just "320D final drive" — we didn't ship. 320D has several versions across serial ranges. After he sent the nameplate serial and year, we locked the exact part, shipped on day three, and it bolted straight on.

Why "320D" alone isn't enough

320D ran for many years — final drives differ across serial ranges in gear counts, bolt patterns and seal types;
Cross-version shipping is the #1 cause of returns in cross-border parts — the right number on the wrong machine bolts nowhere;
That's why our chat team's first reply to a model-only inquiry is always: "Please send a photo of the machine nameplate with the serial number."

How it went

Day	What happened
Day 1	Customer: "320D travel noise, need final drive assembly." We replied: photo of the nameplate (inside the cab door frame), serial and year if possible
Day 2	Photo arrived: serial + year complete. We confirmed the A-version ring gear for that range — and noticed his noise pattern sounded more like a planet-gear bearing, so we suggested the bearing kit first (a fraction of the assembly price)
Day 3	Customer agreed; bearing kit ordered and shipped
One week later	Noise gone after fitting. Customer ordered the same kit for the other side

Where to find the serial / year

CAT: nameplate near the cab door frame or boom foot — one PIN/serial line is enough;
Volvo: usually the right cab door frame — VIN or Product Number both work;
Nameplate rusted over? The engine nameplate or the cast number on the travel motor housing helps us lock it too.

Straight talk: give us model + serial + year together and we not only lock the part — we also flag the common failure parts for that production range so you can stock them in one order.

Appendix: 4 ways to get the exact part right the first time

Method	What you provide	Result
1. Part number (fastest)	The part number / VOE number / CAT number — nothing else needed	Stock and price confirmed within minutes; 100% precise
2. Model + serial number + year	e.g. EC210B + machine serial + year 2015	The same model can have several versions — the serial number pins it down
3. Photo of nameplate / old part	A clear photo of the machine nameplate, or the printed/stamped number on the old part	We verify fitment from the photo — our responsibility, not yours
4. Fault description + replacement history	Briefly describe the symptom and whether/when this part was replaced before	We help judge what to replace — and whether a root cause is still hiding

Send any one of the four to our online chat to lock in the right part. The more you share, the faster and more accurate the quote.

Parts used in this case

Tap through to our live parts search — check stock and send us the part number for an instant quote:

Frequently asked questions

Where is the serial on the nameplate?

It's the line starting with letters (CAT usually calls it PIN). Just photograph the whole plate — we read it for you.

Can I order without the serial?

You can, but we'll verify by part number or photo — one extra check, half a day slower, never the wrong part.

Repair the final drive or replace it?

Oil level OK and housing uncracked? Usually a bearing-and-seal kit does it. Housing or gear damage calls for the assembly. Send photos or a video and we'll judge with you.

Got a part number or a photo?

Send it to our online chat — in-stock parts quoted the same day.

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