A yearly trailer service schedule

Easter in a tin shed is when Australian trailers tell the truth. The box trailer that sat since November has a white bloom on the ungal parts of the drawbar. The boat trailer that did three estuary launches in January still has salt in the drums. The camper that crossed the Strzelecki has a wheel nut you can wind with two fingers and a tail lamp hanging on its earth wire. None of those failures waited for the registration reminder.

A yearly trailer service schedule is useful only if it admits how this country actually treats steel. Heat, salt, corrugations and long idle periods do more damage than kilometres on a highway. This is a practical calendar for light custom trailers — box, cage, boat, plant, horse and camper — written for people who will get under the chassis. It is not a workshop manual and not a substitute for a state inspection.

Service by season and by insult, not only by date

Keep a registration-anniversary service. Then add the insults.

After every salt or brackish launch. Wash the whole trailer, including the back of the drums and the inside of the drawbar, with fresh water. If the hubs went under, treat the bearings as suspect that day, not “next time I think of it”. Boat owners who wait for an annual pack are the owners buying hubs by the pair. Pair this habit with boat trailer set-up.

After corrugations or a long dirt stage. Re-torque wheel nuts, spring U-bolts and coupling bolts. Check lamp plugs and every earth. Look at the safety-chain attachments. Corrugations undo fasteners that a highway never touches.

After a flood, a bogging or a hub that ran hot. Do not keep driving. A hot hub is a bearing or a dragged brake. A drowned hub is water in the grease.

Before a long interstate run. Do the full yearly list a week early, not in a motel car park at Dubbo after the first wobble.

Every year, regardless. The list below. Write the date on the plate with a paint pen if you must. The trailer will not remember.

If you want the mechanical depth behind the rotating assembly, the companion piece is wheel bearings, tyres and trailer brakes. If the chassis is the worry, use preventing rust.

The yearly list, in the order that stops you on the road

1. Hubs and bearings. Jack one side, spin, and feel for roughness or play. Pack or replace on condition, and on a fixed interval if the trailer sees water. Use a high-temperature grease on highway plant; use a grease the boat-trailer maker accepts after immersion — often a marine or water-resistant product, not whatever was on special. Split pins and locknuts have a torque and a feel; guesswork is how drums meet the mudguard.

2. Brakes. Override couplings should slide and return, with a damper that is not empty. Electric drums should lift a wheel when the controller is applied in the yard. Look at lining or pad thickness, magnet faces, disc rust scale and the breakaway battery voltage. Adjust, do not wait for the inspection to find one wheel that does nothing. The legal reason those brakes exist is in when your trailer needs brakes.

3. Tyres. Read the load index against GTM, not against “it still holds air”. Check age stamps. A ten-year-old light-truck tyre on a tandem that sits in the sun is a belt waiting to unwrap on the Stuart. Set cold pressures to the plaque and the tyre tables. Look at inner sidewalls. Swap or replace before a long trip, not after the first heat-fade.

4. Coupling and chains. Open and close the trigger. Look for a flattened 50 mm cup, a worn override slider, a pintle hook that has started to open, and bolts that have backed. Chains should be the right rating, not dragging, not welded to a tab that has cracked. Detail in coupling types.

5. Lamps, plug and earth. Walk around with the ignition on: tails, stops, both indicators, plate lamp, any clearance or side-markers. Wiggle the plug. If a lamp dies when you lift the cable, the earth is the coupling and you have been lucky. Rewire that before the next night run. Lights and number plates is the compliance reading; this is the hose-and-crimp reading.

6. Springs, axles and fasteners. U-bolts loosen. Equalisers on tandems wear. A leaf that has shifted will wear a tyre in 200 kilometres. Check hangers, bushes and the drawbar junction — the weld cluster that sees every corrugation.

7. Floor, body and rust. Lift timber floors enough to see the chassis rails. Probe mud traps behind guards and inside the A-frame. White rust on galvanising is a washing problem; red rust on a seam is a repair problem. Look at chequer-plate screw holes and any timber that has been holding wet soil.

8. Jockey wheel, winch, ramps and tie-downs. These are how people get hurt in the yard. A bent jockey, a winch with a tired pawl, a ramp pin that is not a pin — fix them on the anniversary, not on the street.

A monthly ten-minute version

You do not need a hoist to stay ahead.

• Walk around the lamps with a helper.
• Put a hand near each hub after a short run. Heat should be similar side to side.
• Look at tyre pressures and the coupling lock.
• Rinse off salt or fertiliser the day you carry it.
• Listen for a new rumble. Bearings announce themselves if you are willing to hear them.

Plant trailers that work every week should be on the same rhythm as the machine they carry. Hours, not Easter.

Consumables worth keeping on the shelf

A spare plug, a length of loom, two lamps of each type you actually use, a split pin assortment, a tub of the correct grease, a breakaway battery if you have one, and a torque wrench you trust. The exotic spare is a complete hub assembly for a boat trailer that has to be on the water this Saturday. The cheap spare is wheel nuts that match the studs — mixing metric and imperial on a used tandem is a classic Australian injury.

Do not keep “a bit of copper grease” as a substitute for the right wheel-bearing grease. Do not keep unmarked lamps “for now”. Approved lamps are part of the ADR lighting system, not a colour choice.

What a service is not

A service is not a registration inspection. A blue slip or a roadworthy can fail a lamp and still miss a bearing that will last another month. An inspection is a legal snapshot. A service is how you decide whether to tow to Broome.

A service is not a modification. Changing drum size, axle rating or coupling type can put you back into ADR compliance and a state sign-off. If you are unsure, ask before you weld.

A service is not a polish. Oil on the drawbar over rust is how you hide a crack from yourself.

Write it down

Keep a page in the glovebox: dates, bearing packs, brake adjustments, tyre replacements, torque events after dirt trips. When you sell the trailer, that page is worth more than a brochure. When you keep it, that page is how you notice the right-hand hub is always the hot one.

The maintenance hub is the shelf for the companion pieces. If you are still specifying rather than servicing, put service access into the build — grease points you can reach, drain holes that actually drain, a floor you can lift — via specifying a custom trailer.

This is practical guidance, not a manufacturer’s schedule and not legal advice. If a plated brake or coupling system needs work, use someone who will stand behind it, and confirm any inspection requirement with your state agency.

The next hour in the shed is better spent on the rotating assembly than on rearranging the toolbox. Start with wheel bearings, tyres and trailer brakes, then wash the salt off before it becomes a rust article.