Garage door motor installation and replacement

Almost any working roll-up, sectional or tip-up door can take a motor, but only if the door itself is in order. Centurion's manuals describe a well-balanced door like this:

• It stays where you leave it. Lift it by hand 900 to 1,200 mm off the floor and let go: it shouldn't rise or fall more than 100 mm. ET puts it the same way: the door neither opens nor closes from any position under its own weight.
• It's light to move. It takes the same effort to open as to close, and not much of it: Centurion gives no more than about 10 kg of force for a sectional door and 15 kg for a roll-up.
• It runs clean. It doesn't rub on the walls or frame, and a roll-up doesn't bind in its side guides. On a sectional door the horizontal tracks are level, the vertical tracks plumb, and the door doesn't jump where the curved track meets the straight one.

You can try the first two yourself on a door that has no motor, or one whose motor is released. If the door drops, shoots up or fights you, it needs its springs or tracks put right first: see garage door springs. Centurion's roll-up manual is blunt about it: its motor must not be installed on a poorly adjusted, worn or damaged door. Old locks and ropes come off too, or are disabled, before the motor goes on.

The type of door decides the motor, and each motor has a size limit in its manual:

Every limit assumes a door that's balanced and moving freely. Tip-up doors are worth a second look: Gemini's garage operator, for example, is not made for vertical tip-up doors balanced with counterweights, so the door's mechanism decides which motor can drive it.

A wide door, a caravan-height door (2,540 mm high instead of the standard 2,135 mm) or little room above the opening all change the fitting: Centurion's tip-up guidance, for instance, recommends at least 140 mm of headroom for automation. We measure on site before we recommend a motor.

The manuals set out the job, and these are the parts that matter most to you:

1. A solid fixing. On a sectional or tip-up door the header bracket above the door takes all of the motor's opening and closing thrust, so Centurion requires it to be fixed to a rigid, structural part of the wall or ceiling. ET adds that the fixing must hold even if a balance spring snaps.
2. The right height. Where possible, Centurion mounts a ceiling motor at least 2 m above the floor, with the release cord hanging at about 1.8 m so anyone can reach it.
3. A dry control box for roll-up doors. The RDO Digital's control box is not waterproof, so it goes on a flat wall away from rain, hoses and sprinklers. Centurion fits it on the right-hand end of the door by default, seen from inside, and the other side when needed.
4. A weight bar on a roll-up door, so the curtain doesn't balloon when it starts closing from fully open.
5. Limits set. The SDO4 learns them from physical end stops, the RDO Digital sets them digitally.
6. A wall button out of children's reach. Within sight of the door, at least 1.5 m from the floor and away from moving parts, with the entrapment warning label beside it.
7. The safety test. Once installed, the door must stop and reverse when it closes onto a solid object 35 mm high on the floor.
8. Remotes coded and the battery connected, so the door works through a power cut from day one.

A garage motor plugs in rather than being wired in. ET supplies its garage motors with a sealed 15 A plug for an approved plug point, and warns against extending or changing the plug lead. Centurion's RDO Digital needs a properly earthed 220 V socket for its charger, and Gemini asks for a wall socket within a metre of the motor head.

So the one thing worth checking before we come is whether there's a plug point near where the motor will go: on the ceiling above a sectional door, or on the wall beside a roll-up. If there isn't, adding one is a job for a registered electrician, and our kit prices don't include it.

A new motor can go on a door an old one drove, as long as the door passes the check above. A replacement is a good moment to deal with what wore the old motor out: Centurion points out that dry, rusty springs add friction and that seasonal temperature changes alter it, both of which can make a motor malfunction, so its manuals call for the springs to be greased between the coils with heavy bearing grease.

Remotes often change with the motor, because each make uses its own remote format. One exception worth knowing: ET's DC Blue Advanced roll-up reads ET's newer BLU MIX remotes and is backward compatible with the older ET Blue ones. Centurion's RDO Digital stores 20 remotes.

Whether to repair the old motor or replace it is weighed up in garage door motor prices.

Two kits for roll-up doors and one for sectional and tip-up doors, each with its battery back-up and remotes, and standard installation on a door that already runs freely. 1-year guarantee on every motor kit we supply and install. Prices checked October 2026.

For comparison, published cost guides put the labour alone at R1 000–R2 000 (Kandua) to fit a roll-up motor and R1 200–R2 500 (Kandua) for a sectional or tip-up motor, with the motor itself R2 500–R3 800 (ProCompare) for sectional and tip-up doors. These are market prices, not ours, checked October 2026. Every make and model, with shop prices, is on garage door motor prices.

Your exact price is set in a free quote before any work starts. No call-out fee when we do the work. If no work is done, a R650 call-out fee applies.

A new motor needs little from you, but the manuals ask for a few habits:

• Test the safety reverse once a month. Centurion asks for the obstruction system to be checked monthly: the door should reverse when it meets something.
• Only run the door when you can see it, with nobody under it, and keep remotes away from children.
• Know your battery's reach. Centurion gives the SDO4 12 to 30 operations on battery and the RDO Digital 12 to 20, depending on the door and how long the power has been off. ET gives its DC Blue Advanced roll-up 25 operations over a day on its standard batteries.
• Learn the release. The manual release lets you open the door by hand when the battery is flat: see how to open a garage door manually.