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Sliding Door Repairs · Gauteng · October 2026

Why Is My Sliding Door Hard to Open?

A sliding door that used to glide on one finger now needs a shoulder. It's one of the most common complaints we hear — and in almost every case, the cause is one of five things. Here's how to identify which one you're dealing with, and what a repair actually involves.

1. Worn or seized roller bearings

Rollers are the small wheels housed inside the bottom of your sliding door's frame. They carry the full weight of the glass panel and run along the bottom track every time the door moves. Inside each roller is a set of ball bearings that wear down with use — typically within 5 to 8 years in a busy household, sooner in a dusty environment like Gauteng's Highveld.

When the bearings fail, the roller drags instead of rolls. The door feels heavy, produces a grinding noise, and may leave black residue in the track. This is the single most common cause of a heavy sliding door and accounts for the majority of the repairs We Fix Doors carries out.

2. Track blocked with debris

The bottom track is a channel that collects everything: dust, grit, pet hair, dried leaves, sand tracked in from outside. In Gauteng homes, sand and wind-blown dust are particularly problematic. Over time this compacts into a dense layer that the rollers have to push through — and a good set of rollers in a blocked track feels just like a failing set of rollers in a clean track.

Before assuming the rollers have failed, clean the track thoroughly. Use a stiff brush to loosen the debris and a dry cloth to wipe it out. Don't use water — moisture in the track promotes rust on the roller bearings. If the door improves noticeably after cleaning, the rollers may still have life in them.

3. Bent or corroded track

A sliding door track can be damaged by seized rollers (the door dragging on metal instead of rolling), physical impact (a heavy object dropped in the door opening, construction work nearby), or by corrosion — particularly common near pools or in humid areas. A bent section creates a point where the door catches, making it feel like it hits a wall at a specific point in its travel.

Track damage is less common than roller wear but more expensive to repair because the old track section must be removed and a new section cut to length and secured. The good news: caught before the track is deeply gouged, a track replacement can often be done in the same visit as a roller replacement.

4. Door dropped — frame out of alignment

A sliding door's rollers are height-adjustable — the door can be raised or lowered by turning an adjustment screw at the base of each roller housing. Over time, these screws can vibrate loose, or the rollers can drop as the bearing housing wears. When the door drops, the bottom of the frame may drag on the track, the door may not close flush, and you'll notice a draught gap at the top or side.

This is often mistaken for worn rollers because the symptoms — heavy door, scraping noise — are similar. The difference: if the door catches at a specific point rather than feeling heavy throughout its travel, misalignment is more likely.

5. Lock latch engaging the frame prematurely

Some sliding door locks have an auto-latch that extends slightly from the lock body. If the lock is worn, damaged, or has been forced, the latch can drag against the door frame or strike plate as the door slides, creating resistance at a specific point — usually near the closed position. This is often accompanied by a clicking or catching sound that stops once the door is past that point.

If cleaning and lubricating doesn't resolve the issue within a day, the rollers or track need replacing. Continuing to force a door with worn rollers accelerates track damage — turning an R850 roller repair into a combined R1,200 track and roller job. Catching it early is always cheaper.