Nothing stops a delivery route faster than a liftgate that will not lift. In San Antonio and across South Texas, grocery trucks, beverage distributors, moving companies and construction crews lean on these platforms every single working day. When one quits at a dock off Loop 410 or halfway through a run down I‑35, the driver is stuck, the load is stuck, and the day is gone.

At Ace Welding & Trailer Co. we have been repairing and installing liftgates in San Antonio for more than 80 years. From our shop on FM 1346 we work on Maxon, Waltco, Tommy Gate, Anthony, Leyman and Interlift units almost daily, we stock the parts that fail most, and we run mobile service for fleets across the region. This guide covers what actually goes wrong, how to tell the difference from the ground, what you can fix yourself, and what it costs when you cannot.

Why Liftgates Fail Faster in South Texas

Heat, heavy loads and stop‑and‑go city traffic are hard on a liftgate. Hydraulic fluid thins in summer and leaks past seals that would hold fine in a cooler climate. Electrical connections corrode through the wet months. Constant cycling wears bearings, cables and rollers faster than the maintenance interval in the manual assumes.

The failures we see over and over:

  • Slow or jerky operation
  • Complete loss of power to the gate
  • Fluid on the ground under the rear of the truck
  • A platform that will not level, or will not stay up
  • Grinding, whining or knocking during a cycle

Catching any of these early is the difference between a scheduled repair and a $2,500 roadside call — and it keeps you on the right side of a DOT inspection.

The Five Failures We See Most

1. The Gate Will Not Lift or Lower

Symptoms: nothing happens when you hit the switch, the motor hums but the platform does not move, or the gate lifts empty but stalls under load.

Common causes: a discharged or failing truck battery, corroded ground strap, blown main fuse or solenoid, low hydraulic fluid, or a worn pump motor.

How to check it yourself: start at the battery — you want 12.4 V or better at rest and no green corrosion on the terminals. Follow the ground strap to the frame and make sure it is clean and tight; a bad ground causes more liftgate faults than any single component. Check the fluid level with the platform fully lowered, not raised.

When it becomes our job: a solenoid that clicks but will not pass current, a pump motor drawing hard and getting hot, or a gate that has been run low on fluid long enough to pull air into the system.

2. Hydraulic Fluid Leaks

Symptoms: fresh drips under the rear of the truck, a platform that sinks slowly overnight, or lifting that gets weaker as the day goes on.

Common causes: cracked or chafed hoses, worn O‑rings and cylinder seals, a damaged pump housing, or a system that has been over‑pressurised by overloading.

How to check it yourself: clean the whole area, run the gate through several full cycles, then look for fresh wet spots — old grime tells you nothing. Run a finger down each cylinder rod: scoring or pitting means the seal is going. Tighten loose fittings with a wrench, but do not over‑torque them.

When it becomes our job: a leaking cylinder needs a seal kit or a rebuild, and that is bench work. Budget roughly $400 to $1,200 per cylinder depending on the unit. We keep Maxon, Waltco, Tommy Gate and Leyman parts on the shelf, so most of these turn around fast.

3. The Platform Will Not Fold or Unfold

Symptoms: the platform stays flat, will not tuck away, or one side lags behind the other as it folds.

Common causes: dry pivot points, a broken or fatigued torsion spring, or arms knocked out of alignment by a curb or a dock.

How to check it yourself: grease the pivots and hinge pins first — a surprising number of folding complaints are simply a dry gate. Then look along the arms for a bend, and at the hinge pins for wear or seizing.

When it becomes our job: torsion springs are under serious tension and are not a driveway repair. Bent arms and misalignment need to be measured and straightened properly, not forced.

4. Remote, Switch and Wiring Failures

Symptoms: no response from the control, intermittent operation, or a gate that works from one station and not another.

Common causes: a dead battery in a wireless remote, a failed solenoid or relay, water sitting in the control box, or corroded pins in a connector.

How to check it yourself: try the backup wired switch if the unit has one — that instantly tells you whether the problem is the control or the gate. Replace the remote battery. Clean connections and pack them with dielectric grease.

When it becomes our job: solenoids, relays and control boxes. We stock them for most brands and can convert an older gate to a wireless system if that suits how you load.

5. Uneven Lift or a Tipping Platform

Symptoms: the platform sits higher on one side, shakes during a cycle, or tips noticeably once there is weight on it.

Common causes: one cylinder losing pressure faster than the other, a stretched chain or cable on one side, worn rollers, or a cracked weld at a mounting point.

How to check it yourself: raise the empty gate to bed height and sight across it. Any visible lean empty will be far worse loaded. Stop using it until it is looked at — an uneven platform is how loads and people come off the back of a truck.

When it becomes our job: immediately. This one is a safety fault, not a convenience fault.

Cables, Chains and Rollers

On rail and cable‑style gates, the running gear wears in a predictable way: the gate gets noisy, then jerky, then it stops folding cleanly. Frayed cable strands and elongated chain links are visible if you look, and both are cheap to replace on a schedule and expensive to replace after they let go. We fit heavy‑duty replacements and lubricate the whole run while it is apart.

Platform and Structural Damage

Bent platforms, cracked welds and loose mounting brackets come from curbs, docks and overloading. This is where being a welding shop rather than only a parts counter matters: our fabrication team straightens and reinforces platforms with MIG and TIG work and CNC plasma‑cut plate, and a repaired gate usually comes back stronger than it left the factory. Cracked mounting brackets in particular should never be patched in place — that is the joint carrying the whole load.

Brand‑Specific Quirks We See Every Week

Maxon

Pump motor burnout in hot weather is the recurring Maxon complaint in this climate. We fit upgraded heat‑resistant motors rather than like‑for‑like where it makes sense. Maxon part numbers are model and serial specific, so before ordering anything, read the data plate — we wrote a full guide to that: how to read a Maxon liftgate serial number.

Waltco

Switch and solenoid failures dominate, usually from water getting into the control box. We rebuild the box with better seals instead of just replacing the failed part, which is why they tend to stay fixed. Waltco data plates are read differently from Maxon — see our Waltco data plate guide.

Tommy Gate

Tommy Gate units are generally robust; what we see is wear in the pivot and hinge hardware on high‑cycle trucks, and column wear on rail models. Identification is straightforward once you know where the plate lives — here is the Tommy Gate serial number guide.

Anthony

Older Anthony gates typically need cylinder repacking and updated safety locks. Parts availability is the real constraint on these, so identifying the exact model early saves weeks.

If you already know your model, the fastest route to the right part number is the Part Finder — pick your brand, series and model, then click the numbered part on the exploded‑view diagram.

What Liftgate Repair Costs in San Antonio

Every gate is different, but these are the ranges we quote most often so you can budget honestly:

  • Diagnostic and adjustment — usually the cheapest visit, and often all a slow gate needs
  • Solenoid, relay or switch replacement — a routine part and an hour or so of labour
  • Hose replacement — low cost if caught before the fluid loss damages the pump
  • Cylinder seal kit or rebuild — roughly $400 to $1,200 per cylinder depending on the unit
  • Pump motor replacement — varies by brand; Maxon heat‑resistant upgrades cost more up front and last longer here
  • Platform straightening and reinforcement — fabrication work, quoted after we see it

A roadside failure with a loaded truck costs several times any of these. That is the entire argument for the checklist below.

Your Monthly Liftgate Maintenance Checklist

Ten minutes a month, and you avoid most of the calls we get:

  • Inspect hydraulic lines and fittings for leaks and chafing
  • Check fluid level with the platform down, and check its condition — it should be clean and pink or red, not dark
  • Test every safety switch and roll stop
  • Lubricate pivot points, hinge pins and rollers
  • Listen through a full cycle for grinding, whining or knocking
  • Clean electrical connections and battery terminals, and check the ground strap

Real‑World Examples from Our San Antonio Shop

A local beverage distributor brought in a Maxon gate that had stopped lifting under load. We found a failing pump motor and a leaking cylinder, replaced both, and upgraded the wiring while it was open. The truck was back on route the same afternoon.

A customer running a 26‑foot box truck caught a curb and bent the Waltco platform. We straightened it, reinforced it and added gussets at the stress points. It has been handling heavier pallets since than it did new.

A construction company had an Anthony gate that had been out of service long enough that they were pricing a replacement unit. The cylinders needed repacking and the safety locks needed updating — a fraction of the cost of a new gate.

And a moving company called with three Maxon gates down at once, all different models, all with unreadable data plates. We identified all three from the pump castings and platform dimensions and had parts on the truck the next morning.

When to Bring It to Ace Instead of DIY

Grease a pivot, change a remote battery, clean a ground strap, tighten a fitting — all fair game, and we would rather you did. Bring it to us when you are looking at anything under hydraulic pressure, anything structural, anything electrical past a fuse, or anything at all on a gate that lifts unevenly.

Call the parts desk on (210) 667‑1171, or bring the truck to the shop at 9425 FM 1346, San Antonio, TX 78263. If you cannot read your data plate, text us a photo of it and we will tell you what you have. We run mobile service for fleets across San Antonio, the I‑35 corridor and South Texas, and we keep the common failure parts in stock rather than ordering them after you call.

Conclusion

Most liftgate failures announce themselves before they strand anyone — a slower cycle, a small drip, a new noise, a slight lean. Ten minutes a month of looking, and a phone call at the first sign rather than the last, is what keeps a gate working and a truck earning.

Know what you need already? Go straight to the Part Finder. Not sure what you have? Call us — we do this every week.