Fall rig maintenance, the checklist to run before heating season

September is the quiet month that decides your winter. The attic rush is over, the heating-season calls have not started stacking up yet, and for a few weeks the rig can sit still long enough to actually work on it.

Here is the math that should motivate you. A blown heater core or a scored pump in January does not just cost the part and the labor. It costs the two or three jobs you had booked that week, plus the customer who called someone else and stayed with them. Rigs fail in January because nobody touched them in September. The failure is scheduled now — you just have not seen the invoice yet.

So block out two days this month. Here is the list we would run, in order, with the reason behind each item.

Proportioner and heaters

The proportioner is the heart of the rig and the thing you can least afford to lose in cold weather, because winter spraying leans hard on the heaters.

• Pull and inspect pump packings on both sides. If you saw pressure imbalance or crossover warnings at all last season, repack now. A pump that limped through August will not survive winter, when cold hoses and cold weather thicken everything it has to move.
• Test every heater zone — primary heaters and hose heat — at full setpoint, and watch that it holds under flow, not just at idle. A heater that reaches temperature with the gun closed but sags when you trigger is a heater that fails you in January.
• Check heater elements and thermocouples for scale and corrosion. Replace anything questionable. These are cheap in September and priceless in a cold snap.
• Verify pressure transducers read even side to side. Off-ratio alarms you cannot trust are worse than no alarms.
• Change fluids and filters per the manufacturer's manual: hydraulic oil on hydraulic machines, throat seal liquid, Y-strainer screens on both inlets.

Heated hose

Walk the entire hose, all of it, unbundled.

• Look for cuts, kinks, worn scuff jacket, and any spot where the heat element could be damaged. A cold section in the hose means off-ratio foam at the gun and a callback you will eat.
• Check the hose thermocouple or FTS unit — a bad sensor makes the whole hose lie to you.
• Test hose heat end to end on a cool morning and feel for dead zones near the connections.
• Inspect and re-tape connections and make sure the whip hose, the most abused three feet on the rig, is sound. Keep a spare whip on the shelf.

Gun and rebuild stock

The gun is a wear item. Treat it like one.

• Do a full teardown and cleaning. Replace side seals, mixing chamber, and o-rings if there is any doubt.
• Stock at least two complete rebuild kits and a spare mixing chamber in the size you actually spray. When a gun goes down mid-job in January, the difference between a 20-minute fix and a lost day is whether the kit is in the trailer.
• If you can swing it, a complete backup gun is the single best insurance item on this list.

Transfer pumps and drum hardware

• Pull both transfer pumps and check for wear, especially the B-side pump, which lives in abrasive resin.
• Inspect air lines, regulators, and lubricators. Drain water traps — trapped moisture freezes first.
• Check desiccant dryers on the A-side drum vent and replace the desiccant. Iso plus moisture equals crystals, and crystals eat pumps and guns.
• Test your drum heater bands now. Plug each one in, confirm it heats evenly and the thermostat cycles. You will need them the first cold week, and so will everyone else — which is why they sell out in November.

Generator and power

• Service the generator: oil, filters, plugs, load test. Winter spraying at full heater draw is the heaviest load your power plant sees all year.
• Run it under something close to full rig load, not just idle. A generator that hunts under load will brown out your heaters exactly when you need them most.
• Check cords, connections, and the panel for heat damage from the summer season.

Trailer and box

• Tires, bearings, brakes, lights, breakaway battery. You will be towing on snow and salt soon.
• Check the box heater and insulation in the rig enclosure. Your material needs to stay roughly 60 to 80 degrees on the way to the job and while you spray, and the enclosure is what makes that possible in January.
• Fix roof and door leaks now. Water in the rig box in winter becomes ice on your equipment.

Consumables to stock before the rush

1. Gun rebuild kits, mixing chambers, side seals — minimum two of each.
2. Drum heater bands and a spare thermostat controller.
3. Throat seal liquid, pump lube, hydraulic oil, filters.
4. Desiccant refills and spare drum bungs and fittings.
5. Respirator cartridges and fresh-air system parts per your SDS program — change-out schedules do not pause for winter.
6. Plastic, tape, and masking supplies, which get harder to work with in the cold, so buy the good stuff.

Every one of these items is a shelf part in September and an emergency order in January. Buy them while they are boring.

One afternoon of paperwork

While the wrenches are out, update the maintenance log: hours on the proportioner, date of last repack, hose serials, generator hours. When something acts up in February, that log is how you diagnose it in one phone call instead of three cold hours of guessing.

If part of the reason the spare-parts shelf is thin is cash flow — you are waiting on receivables from summer work — that is a solvable problem, and it is exactly the kind of thing invoice factoring exists for. Talk to us at Winters Breath; between factoring, material fronting on signed jobs, and heated freight from November through March, our whole business is keeping your rig spraying through heating season.