Guide Rollers and What They Do
Guide rollers carry no weight at all, which is exactly why nobody services them. The inspection list at Mount Pleasant Sliding Gates Narcoculture puts them alongside the load bearing wheels, because sliding leaves on Mount Pleasant driveways fall over sideways for one reason and this is it.
What They Are For
A slider is a tall thin panel standing on a narrow base. Vertically it is stable. Sideways it is not, and wind, a vehicle brushing it, or somebody leaning on it will all try to tip it. Guide rollers stand in pairs at the receiving post and at the guide post, gripping the frame between them and holding it upright through the whole travel.
On a Cantilever They Do More
A cantilever gate has no ground track and its truck assemblies provide the vertical support, so the guides are the only thing controlling lateral position along the run. A guide roller that has seized on a cantilever installation means the frame is being dragged against a stationary wheel, which scores the rail and wears the finish through to bare metal in a season.
Adjustment
The pair should touch the frame without pinching it. Too loose and the gate rattles laterally and can jump the guide entirely in a gust. Too tight and both wheels drag, the operator sees the extra load, and the force setting gets turned up to compensate, which hides the fault and accelerates it.
What to Look For
A bright polished stripe along the gate frame at guide height means a wheel has stopped turning. Fine metal dust below a guide bracket means the same. A wheel that spins freely by hand but squeals in service is usually running against a frame that has moved rather than being worn itself.
The Catch and the End Stop
Most installations also carry a catch or receiver at the far post that supports the leading edge when the gate is closed. That is what stops a long leaf drooping when it is shut, and it needs the same attention. A gate that closes onto a catch which has dropped is being held up by the guides, and the guides were never meant to do that.