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Before
After
Before
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Before
AfterLiftMaster Gate Motor Replacement: The West Hollywood Owner’s Guide
We replace LiftMaster gate motors throughout West Hollywood, and we stock the most common motor boards, arm assemblies, and full operator units on the truck, so most swaps happen same day. Installed replacement typically runs $450 to $1,100 depending on whether we’re replacing the motor assembly only or the full operator head, and we quote that price in writing before any work starts. The usual story we hear: the gate worked fine for years, then one morning it hummed and didn’t move, or it stopped responding to the remote entirely after a storm.
Here’s the thing about LiftMaster motors that surprises people: the motor itself rarely fails first. The control board, the capacitor, or the limit switch usually goes, and those are repairable for less than a full replacement. We’ll tell you which one you actually have before we sell you anything. Hal Gatewood has been working on LiftMaster operators in the hillside driveways of West Hollywood since 2001, and the first question he asks is always the same: what’s it doing wrong?
Which LiftMaster Models This Applies To
LiftMaster makes three gate operator lines that show up regularly in West Hollywood, and you need to know which one you have before anyone quotes you a motor. The LA400 and LA412 are the swing gate operators you see on residential driveway gates up in the hills, single-arm units that run on 12V DC with a battery backup. The LA500 is the heavier-duty swing version, more common at multi-unit buildings and smaller HOAs. The SL3000 and SL585 series are slide gate operators, usually commercial, and they’re built differently enough that parts don’t interchange.
The gotcha: a LiftMaster LA400 motor assembly will not fit an LA500, even though they look similar in online photos. The mounting pattern is different, the stroke length is different, and if you find a cheap “LiftMaster replacement motor” online without a series number, it’s likely meant for an older model that LiftMaster discontinued a decade ago. Always check the silver label on the side of the operator head. The model number and serial are there, and that’s the number we match against before ordering anything. We also service Mighty Mule, Ghost Controls, and DoorKing if you’re not sure what you have.
On the OEM-versus-aftermarket question: LiftMaster’s own parts carry the factory warranty and fit without modification, which is what we recommend for anything still under the operator’s original warranty. For older units where the OEM board is backordered or priced high, we carry tested aftermarket boards from manufacturers we’ve used for years and stand behind with our own 90-Day Done Right Promise. We’ll tell you the tradeoff either way and let you decide.
Signs Your LiftMaster Gate Motor Replacement Is Failing
- Gate hums but doesn’t move. That’s often a failed capacitor or a stripped gear inside the motor housing. The motor is getting power but can’t start under load. We’ve seen this on LA400 units that are 6 to 8 years old, especially in West Hollywood where the morning marine layer puts extra moisture on exposed operators.
- Remote stopped working, but the keypad still opens the gate. That’s usually the receiver or the control board inside the operator, not the motor itself. A board replacement is cheaper and faster than a full motor swap, which is why we diagnose before we quote.
- Gate opens but stops halfway and reverses. Bost limit switch failure or a worn clutch. If you hear a grinding noise right before it stops, it’s the clutch. If it’s silent and sudden, it’s the limit switch losing its position memory.
- Battery warning light stays on, even after a power outage. That’s the battery charging circuit on the control board. In older LiftMaster units, the board keeps trying to charge a battery that’s already dead, which eventually kills the board too. We replace both at once when that’s the case.
- Operator works but the gate moves in slow motion or stutters. A motor drawing too much current or a gate that’s out of alignment fighting the operator. We see this a lot in West Hollywood where hillside shifting has thrown the gate posts a half-degree out of plumb. New motor won’t fix that. The post repair has to come first.
Replacement Cost & What’s Included
Here are the numbers we quote in West Hollywood, plain and simple:
- Motor assembly replacement (LA400/LA412): $450 to $700 installed
- Full operator head replacement (LA400/LA412): $800 to $1,100 installed
- Control board replacement only: $225 to $400 installed
- Capacitor or limit switch repair: $120 to $250 installed
Every quote includes the part, the labor to remove the old one and mount the new one, wiring cleanup where needed, and a full cycle test so we don’t leave until it opens and closes cleanly several times in a row. The price we quote before we start is the price you pay at the end. If something else is wrong and the fix costs more, we stop and call you first with the new number, and you decide. Your work is covered by our 90-Day Done Right Promise in writing: if it’s not done right, one call brings us back, no runaround. There’s no trip charge inside the county, and we take $40 off any repair over $200 right off the top.
DIY or Call Us?
If you’re handy, there are a few things you can check before calling: confirm the power source is live at the outlet, check that the battery disconnect switch hasn’t been tripped, and look at the fuses on the board. Those are safe, simple checks. What you should not do is open the motor housing and start probing around the capacitor. Even with the unit unplugged, a charged capacitor stores enough voltage to put you on your back, and the arm assembly on a swing operator is under tension. We’ve repaired more than one unit where someone with good intentions made a cheap fix into an expensive one.
If the motor is genuinely failed or the board is fried, call (323) 677-4063. We’ll show up with the right part, quote it in writing, and most of the time we finish the same day. If you’d rather stop by the shop and look Hal in the eye first, the address is published and the coffee’s on.
FAQs
Seven to ten years is typical for an LA400 or LA412 in West Hollywood, assuming the gate itself is aligned and the operator isn’t fighting the wind load or a sagging hinge post. Units closer to the coast or in fog-heavy canyon pockets sometimes fail earlier because the marine layer accelerates board corrosion.
Yes, and often we do. If the capacitor, limit switch, or wiring is the problem, a repair runs $120 to $250 and buys you several more years. If the motor windings themselves are burned out or the gearbox is stripped, replacement is the only honest fix. Call (323) 677-4063 and describe what it’s doing; we’ll tell you which situation you’re in before we come out.
Most LiftMaster motor replacements in West Hollywood are done in 90 minutes to two hours. That includes removing the old unit, mounting the new motor or operator head, reconnecting the wiring, and cycling the gate at least six times to confirm clean operation. If we find structural issues like a misaligned post, that’s a separate repair we’ll quote before adding any time to the job.
We stock LA400 and LA412 motor assemblies and control boards on the truck, plus common capacitors and limit switches. For less common models like the LA500 or Slide operators, we can usually have the part in hand within one business day through our local supplier. Call (323) 677-4063 with your model number and we’ll tell you exactly when we can have it on your gate.
Call Gatewood Fence & Gate
Tell me what it’s doing wrong and I’ll tell you what it actually needs – give me your number and I’ll call you back myself. Hal Gatewood has been fixing LiftMaster gates in West Hollywood since 2001, and the name on the shop is the name on the invoice. Call (323) 677-4063 for a free estimate. A live person answers, day or night, and we’ll set a window we actually keep.
Written by Hal Gatewood, Owner, Gatewood Fence & Gate, serving West Hollywood and nearby areas.