What should be checked on a slide gate each season
Why does a slide gate need a seasonal check?
A slide gate needs a seasonal check because every part that moves also wears, and the wear is cheap to catch early and expensive to catch late. A leaf that rolls a few hundred times a month through Georgetown heat, dust and wet clay changes a little each season. A twenty minute walk along the track, with the operator released, finds nearly every fault while it is still a small adjustment.
What gets done before the check starts?
The power to the operator is switched off or the operator is put into manual release, so the leaf can be moved by hand and nothing starts on its own. Anything blocking the run is cleared away. A broom, a stiff brush, a rag, a grease gun, a level and a few hand wrenches cover the whole job. A flashlight helps with the carriage brackets, which sit in shadow under the bottom rail.
How is the track checked?
On a track gate the first job is cleaning the groove. Leaves, gravel, dried mud and bits of mulch collect in the channel, and a screwdriver or stiff wire drags them out. The track is then sighted along its length for a high spot or a low one, and a string line pulled tight beside it shows whether the track has bowed. A groove that holds standing water after rain is worth noting, since water freezes in a cold snap and rusts the track every other week of the year.
On a cantilever gate there is no groove, so the check moves to the bottom rail, which is wiped clean where the carriages grip it. Bright, polished wear marks are normal. Gouges, flakes of coating or a flat on the rail are not, and each one points to a wheel or a carriage that needs adjusting.
What does a hand test tell the owner?
With the operator released, the leaf is pushed from the closed position to the open one and back. A healthy leaf moves with a couple of fingers and with no catch. A rumble means a bad bearing, a tick means a flat spot on a wheel, and a stiff stretch means the track or the carriage line is out of true at that point. The hand test is the single most useful part of the visit, because the leaf reports its own faults.
Which wheels and bearings need attention?
Each wheel is spun by hand and watched. It should turn freely, run quietly and sit square on its axle. Any wobble, any grind and any rough spot means the bearing is on the way out. Guide rollers are set so they touch the frame lightly without pinching it. If a roller has worn a flat or the bracket has loosened, it is tightened or replaced. Grease fittings, where fitted, get a pump or two of fresh grease, and the old grease is wiped away so grit does not stick to it.
What about the posts and footings?
Posts are checked with a level on two faces. A post that leans toward the run or away from it has moved in the clay, and the carriage line moves with it. The ground around each footing is inspected for gaps, because a ring of open soil at the base of a post is the first sign of a footing that is rocking. Cracks in the slab that run across the track are marked with a pencil and watched from season to season to see whether they widen.
How are the limits and stops set?
The open and closed limits tell the operator where to stop, and they drift over time as wheels wear and the leaf settles. A gate that stops short of the latch post, or slams into the stop, needs its limits reset. The stops themselves, whether rubber bumpers or steel blocks, are checked for cracks and loose bolts. A bent stop is replaced, since a leaf that hits a bent stop twists the frame a little each time.
What does the safety gear need?
Safety sensors, edges and reversing circuits protect people and vehicles, and they are tested by hand each season. A photo eye is blocked with a cardboard sheet while the gate closes, and the leaf should stop and reverse. A contact edge is pressed and the leaf should react at once. Lenses are wiped clean, since a film of dust can blind an eye that worked fine in spring. A manual release is tried with the power off, because a release that is seized is useless during an outage.
How does the finish hold up?
Steel tubing finished with galvanizing and powder coat holds up well, but chips happen where a wheel carriage rubs or a vehicle taps a post. A chip is cleaned, wire brushed to bright metal, sealed with a zinc rich primer and touched up with a matching paint before rust spreads under the edge. Welds are looked at closely, since a hairline of rust running along a joint can be the first sign of a crack. Any bolt that has rusted through its washer is replaced with a galvanized one.
What changes with the seasons around Georgetown?
Spring brings the rain that swells the clay, so posts and track strips are measured after the wettest weeks. Summer brings heat and dust that thin the grease and wear the bearings. Fall brings leaves into the track, along with the live oak debris that clogs the groove after a windy night. Winter brings the occasional hard freeze, when water in the groove becomes ice and a gate pushed by the operator can bend a wheel bracket. Matching the checks to the season gives each one a clear purpose.
What gets written down?
A notebook kept in the gate box or a phone note works well. The date, the post lean, the state of each wheel and the limit settings go into it. Over a few seasons the notes show a pattern: a post that moves every spring, a wheel that wears faster than the others, or a track that holds water. A pattern is much easier for a crew to fix than a surprise, and it tells the crew where to start looking when something finally fails.
When does the check turn into a repair?
A repair is called for when a wheel has a flat spot, a bearing grinds, a post has leaned beyond what shimming can fix, a weld has cracked or the leaf no longer moves freely by hand. Anything that involves welding, drilling a new footing or replacing a carriage should be done by a crew with the tools for it. Everything on the checklist above, though, is within reach of an owner with a brush, a rag and a pair of eyes.
How does the work near Lake Georgetown differ from the work in town?
Gates closer to Lake Georgetown and the San Gabriel River floodplain meet more moisture and more fine silt, so their tracks and bearings need cleaning more often than gates on higher ground. Dust from a gravel drive packs into the groove, and a damp morning turns it into paste that grabs the wheels. A gate on a paved neighborhood street in a place like Sun City Texas sees less grit but more sprinkler overspray, which sits on the bottom rail and leaves mineral spots. The check is the same either way, though the interval between brushings can stretch or shrink with the setting.
Which small spares are worth keeping on the shelf?
A spare wheel, a pair of stop bumpers, a tube of zinc rich primer, a can of matching paint and a handful of galvanized bolts cover most of what goes wrong between visits. A wheel in a drawer turns a half day delay into a ten minute swap. The spare should match the wheel on the gate in diameter, bore and groove shape, so the size is written on the notebook page beside the date of the last check.