A close look at a Maxon liftgate data plate — the key to identifying the right parts fast.
When your Maxon liftgate goes down mid-route in San Antonio, the first question every parts counter is going to ask you is simple: what’s the serial number? Without it, you’re guessing at models, waiting on the wrong parts, and losing a day of hauling. With it, most repairs move fast — often the same day. Whether you’re stuck at a warehouse dock off Loop 410, sitting at a delivery stop on I-35, or trying to finish a run through the Hill Country before dark, the difference between a good serial number read and a bad one can mean the difference between rolling by lunch and sitting through the weekend.
At Ace Welding & Trailer Co., we’ve been servicing Maxon liftgates in San Antonio and across South Texas for over 80 years. From our FM 1346 shop, our team stocks the most common Maxon parts and can identify almost any Maxon unit — GPTLR, GPTWR, TE-series, BMR, RC, or DMD — by its data plate alone. We’ve walked hundreds of owner-operators and fleet managers through the same steps we’re about to walk you through here.
This guide shows you exactly where to find your Maxon liftgate serial number, how to read what’s on the data plate, and what to do if that plate is missing, damaged, or unreadable — which happens a lot on gates that have been running South Texas heat and humidity for a decade. Whether you’re calling us for parts, ordering online, filing a warranty claim, or shopping a used truck, this is the fastest way to get the right answer the first time.
No job too big or too small — that’s been our promise since 1946.
Why the Serial Number Matters More Than You Think
Maxon has built dozens of liftgate models over the years, and even within a single family — say, the GPTLR — there are variations in capacity, platform size, hydraulic configuration, and mounting style. Two units that look nearly identical on the back of a truck can take completely different pumps, cylinders, and control boxes.
That’s why every Maxon repair, warranty claim, or parts order starts with the same information:
- Model number
- Serial number
- Year of manufacture
- Capacity rating
Get any one of those wrong and you’re waiting on a return shipment while your truck sits at our FM 1346 shop or in your yard.
Where to Find the Data Plate on a Maxon Liftgate
Maxon rivets a metal data plate to every liftgate at the factory. On most units we see roll through the shop, you’ll find it in one of these locations:
- On the main frame or cross-member — usually on the driver’s side, near the hydraulic pump.
- Inside the pump enclosure — pop open the pump cover and look on the interior wall or pump housing itself.
- On the platform pivot arm or lift arm — check both the inside and outside of the arm.
- Near the control box or switch housing — especially on newer GPTLR and TE-series units.
If your unit has been in service in San Antonio, along the I-10 corridor, or running cross-border out of Laredo for more than a few years, sun, road salt, and pressure washing may have faded the plate. Bring a flashlight and clean the surface gently with a rag before you write anything down. Aggressive scrubbing can wipe out what’s left of the stamping.
What’s Actually on a Maxon Data Plate
Every Maxon data plate carries the same core information, though the layout has changed across model years. You’ll typically see:
- Model number — tells you the family (GPTLR, GPTWR, TE-20, TE-25, BMR, BMRA, RC, DMD) and the specific configuration.
- Serial number — a unique identifier for your specific unit.
- Capacity — the rated lift capacity in pounds (commonly 1,600, 2,500, 3,000, or 4,400 lbs).
- Date of manufacture — sometimes stamped as a code, sometimes as a plain date.
- Hydraulic and electrical specs — pressure ratings, voltage, and pump specs.
When you call our parts counter, we ask for the model number and serial number together. That combo tells us the exact hydraulic layout, cylinder bore, pump type, and control system — so we can pull the right parts on the first try and get you back on the road faster.
Decoding the Model Number
Maxon uses model prefixes that give you a quick read on the type of gate you have:
- GPTLR / GPTWR — Rail-style tuckaway gates, some of the most common on box trucks and reefers running the I-35 corridor.
- TE-20 / TE-25 — Tuckaway gates in the popular 2,000 and 2,500 lb range, common in last-mile and beverage delivery around San Antonio.
- BMR / BMRA — Rail-lift style, common on medium-duty applications hauling out of San Antonio warehouses.
- RC series — Rail Cargo lifts for heavier freight duty on LTL and long-haul work.
- DMD — Dock-level gates for specialized applications.
The suffix numbers and letters after the family designation usually indicate capacity and platform configuration. If you’re unsure what your prefix means, snap a photo of the plate and text it to us at (210) 778‑5916 — we’ll identify it and quote parts right from the message.
What to Do If the Data Plate Is Missing or Unreadable
We see this all the time — especially on older Maxon units that have been through 10+ Texas summers. Don’t panic. Here’s how we identify a mystery Maxon at our FM 1346 shop:
- Measure the platform — width, depth, and folded height give us a starting point.
- Check the pump and motor — Maxon stamps part numbers on many pump housings and motor casings.
- Look for a stamped chassis number — some units have a secondary ID stamped directly on the main frame.
- Photograph the whole gate — the arm geometry, cylinder placement, and mounting style tell a trained eye a lot.
If you bring the truck to our shop, we can usually pin down the exact model in under 30 minutes. For fleet accounts, we keep a log of every unit we’ve serviced so you don’t have to re-identify the same gate twice.
Real-World Examples from Our San Antonio Shop
Last month a local moving company called us with three Maxon liftgates down at once — all different models, all missing legible data plates. We had a technician on-site within two hours, identified all three from the pump castings and platform dimensions, and had parts on the truck by the next morning.
Another customer, a beverage distributor running routes through north San Antonio, brought in a GPTLR with a pump that had burned out in the summer heat. Because he’d already sent us a clear photo of the data plate the night before, we had the upgraded heat-resistant motor waiting when he pulled in. He was back on route by lunch.
We also worked with a Laredo-based freight hauler running I-35 who thought he had a TE-25 but actually had an older BMR — the wrong parts had been ordered twice before he found us. One accurate data plate read saved him weeks of downtime.
When to Bring It to Ace
If you can’t find your data plate, can’t read it, or aren’t sure what the numbers mean, don’t guess. Text a photo to (210) 778‑5916 or bring the truck by our FM 1346 shop. We service Maxon liftgates every week — parts on the shelf, mobile service available for fleets across San Antonio, the I-35 corridor, and South Texas, and 80+ years of local know-how behind every repair. You can see the full lineup of what we handle on our San Antonio liftgate and trailer repair services page.
Conclusion
Reading your Maxon liftgate serial number correctly is the single fastest way to get the right parts, the right repair, and the right answer from your service shop. Whether you’re calling us at Ace, ordering online, or filing a warranty claim, the model number and serial number are the two pieces of information that make everything else move faster.
If your data plate is missing, faded, or you just want a professional to verify what you’ve got, bring it to Ace Welding & Trailer Co. Our experienced team combines factory-level knowledge with 80+ years of local know-how to get you fixed right the first time.
Ready to get your truck back on the road? Call Ace Welding & Trailer Co. at (210) 667‑1171, text a photo to (210) 778‑5916, or visit aceweldingandtrailer.com for a free quote. From our FM 1346 shop, we’ve been keeping San Antonio and South Texas trucks working since 1946 — no job too big or too small.