There is a specific family of gate fault that confuses people more than a dead motor does: you press the remote, the control board clicks, the motor starts and runs — and the gate does not move an inch. Power is getting through and the machine is working, yet nothing happens. That combination almost always means one thing: the fault is in the mechanical chain between the motor and the gate, not in the electronics.
This article walks that chain. It is deliberately different from our other two troubleshooting guides: the error codes guide covers what the controller is telling you when it refuses to run, and the remote troubleshooting guide covers commands that never arrive at all. Here the command arrives, the motor runs, and the drive in between is the problem.
The Two-Minute Checks First
Before assuming a broken component, check the one cause that accounts for a remarkable share of these call-outs: the manual release. Every gate motor has a release mechanism — a key, a lever or a handle — that disconnects the drive so the gate can be pushed by hand during a power cut. If it was released for load shedding, a delivery, or a stuck vehicle and never re-engaged, the motor will run exactly as normal while driving nothing at all. Our manual release guide shows what the engagement looks like on the common brands; re-engaging it takes seconds and costs nothing.
While you are there, look at the gate itself. Try pushing it by hand (release first, or with the motor disengaged). A gate that will not roll by hand has a gate problem, not a motor problem — a wheel that has come off its track, a flat-spotted roller, or a track full of debris after a storm. The motor senses the resistance and either slips its clutch or trips its obstruction protection, and from the outside that looks identical to a broken drive.
The Clutch: Designed to Slip, and It Wears
Between the motor and the output shaft sits a clutch or slip coupling, and it exists to sacrifice itself: when the gate hits an obstruction, the clutch lets the motor keep turning instead of destroying gears. The failure mode follows from the design. An incorrectly adjusted clutch set too light will slip under perfectly normal load — the gate moves a few centimetres, then the motor just spins. A worn or contaminated clutch (water ingress, old grease, grit) does the same gradually. The symptom signature is distinctive: the motor runs with a slightly higher-pitched, unloaded whirr, and there is no strain in its sound at all. A motor driving a gate sounds like it is working; a motor slipping its clutch sounds like it is idling.
Rack and Pinion Failures on Sliding Gates
On a sliding gate, the motor pinion meshes with a toothed rack bolted along the gate. The common failures are mechanical and visible: rack bolts working loose so a section rides up and skips teeth, a stripped section of rack (often where a vehicle has touched the gate), a gap in the mesh where the rack was joined mid-span, or the pinion nose working loose on the shaft. The classic report is a clunk followed by free spinning — the pinion jumped a tooth and now turns in air. Mesh and alignment faults like these are almost always installation or settlement issues, which our installation mistakes guide covers in detail; they are also the reason force settings should be recorded at every service.
Arms, Couplings and Underground Drives
Swing gates fail differently. Articulated and sliding-arm operators lose drive through worn bushings, sheared pins or a front bracket that has worked loose — the arm moves at the motor end but the thrust never reaches the leaf. Underground operators hide a coupling between the motor and the pivot gearbox; when that coupling strips (usually after water has sat in the foundation box for a season), the motor turns and the gate stands still. Foundation box drainage is the unglamorous maintenance item that prevents most of these.
When It Really Is the Motor
Sometimes the chain is intact and the failure is internal: a stripped gear stage inside the gearbox itself, typically after years of a gate fighting a bind or an undersized motor working near its limit. The sizing arithmetic in our weight guide is what prevents that end of the chain from eating itself. Internal gear failure on a recent unit is a warranty matter — do not open the gearbox yourself, because a broken seal or stripped casing screw hands the manufacturer an easy refusal. On older units the calculus is replacement versus rebuild, and the honest comparison of service plans and repair economics in our service plan guide is how to think about it.
Frequently Asked Questions
Can I damage the motor by trying it repeatedly?
Yes, if the clutch is slipping or the gate is binding — repeated cycling turns a small mechanical fault into heat, wear and eventually a tripped controller. Two or three attempts to confirm the symptom, then stop and diagnose.
Is this something I can fix myself?
Re-engaging a manual release, clearing a track and tightening visible rack bolts are owner-safe. Anything involving the clutch adjustment, gearbox or drive couplings is an installer job — those settings set the safety behaviour of the machine.
How urgent is a gate that will not move?
More urgent than it looks: a gate stuck open is a security exposure, and one stuck closed can trap vehicles. If the release works, secure the gate manually in the meantime and treat the repair as same-day.
Why does the gate move a little and then stop?
That pattern points at a light clutch, a loose rack section or a gate binding partway along its travel — the drive engages, takes load, and slips or jams at the same spot each cycle. Note where it stops; the position is itself a clue.
If your motor spins and your gate does not, the fault is usually found in ten minutes with the cover off — and repaired the same visit when the van carries the common spares, which ours does. Send the brand and what you hear when it runs, and we will tell you what it likely is before we arrive.