Sewer Jetter Maintenance — The Complete Checklist to Keep Your Equipment Running Strong

Trailer Mounted Hot Water Sewer & Drain Line Jetter - Yellow

Updated March 2026 | By HotJet USA

Your trailer jetter is a money-making machine — but only if it’s running right. Skip the maintenance and you’ll pay for it in downtime, blown hoses, and lost jobs. Whether you’re running a HotJet II hot water jetter or a cold water rig, this checklist covers everything you need to keep your sewer jetter maintenance on track year-round.

Table of Contents

  1. Before Every Job — Daily Pre-Check
  2. Weekly Maintenance Tasks
  3. Monthly Deep Maintenance
  4. Seasonal / Winterization Maintenance
  5. Common Mistakes That Kill Jetters Early
  6. Frequently Asked Questions

Before Every Job — Your Daily Sewer Jetter Pre-Check

This takes five minutes and saves thousands. Don’t skip it.

  • Check engine oil level — Low oil is the #1 engine killer on trailer jetters. Top it off every morning.
  • Inspect the jetter hose — Look for kinks, abrasion, bulges, or fittings that are starting to weep. A blown hose on a job site isn’t just expensive — it’s dangerous.
  • Check the water supply — Make sure your tank is full and the inlet filter is clean. Running dry burns out pumps fast.
  • Test the nozzle — Make sure it’s clear and spinning freely. A clogged Warthog nozzle won’t cut it in a grease-packed lateral.
  • Inspect trailer tires and hitch — You’re towing heavy equipment on public roads. Check tire pressure and hitch pin every time.

Weekly Maintenance for Your Drain Line Jetter

Set a day — Friday afternoon works for most shops — and knock these out before you park it for the weekend.

  • Flush the water system — Run clean water through the entire system for 2-3 minutes to clear debris and sediment from lines.
  • Grease the hose reel — Your HD hose reel takes a beating. Hit the zerks with a grease gun weekly to keep it turning smooth.
  • Check all belt tensions — Loose belts slip, overheat, and snap. Tighten to spec.
  • Inspect the burner (hot water jetters only) — If you’re running a HotJet II hot water jetter, check the burner for soot buildup and clean the flame sensor. A dirty burner means cold water on grease jobs — and unhappy customers.
  • Test safety shutoffs — Run the unit and verify the low-water shutoff and pressure relief valve are working. These protect your pump and your crew.

Monthly Deep Maintenance

Once a month, give the whole rig a thorough going-over. This is where you catch the small stuff before it becomes big stuff.

  • Change engine oil and filter — Don’t wait for the hour meter to hit the redline. Monthly changes are cheap insurance for a $50,000+ machine.
  • Replace the inlet water filter — Sediment kills pumps. A $5 filter protects a $3,000 pump. Simple math.
  • Inspect the pump valves and seals — Look for any drips or pressure drops. Catching a worn seal early saves you a full pump rebuild later.
  • Check all electrical connections — Corrosion, loose wires, and frayed insulation cause intermittent failures that are maddening to diagnose on a job site.
  • Inspect the trailer frame — Check welds, mounting bolts, and the coupler. Look for cracks, rust, or anything that’s worked loose from vibration.
  • Clean the entire unit — Pressure wash the trailer, engine compartment, and hose reel. A clean machine is easier to inspect and lasts longer.

Seasonal Maintenance — Winterizing Your Sewer Jetter

If you’re in a climate that freezes, this is non-negotiable. Frozen water in your pump, hose, or heater coil will crack components and cost you thousands.

  • Drain ALL water — Pump, hoses, tank, heater coil, spray gun — everything. Open every drain valve and blow compressed air through the lines.
  • Add antifreeze to the pump — Use RV-grade non-toxic antifreeze. Run it through the pump and heater coil.
  • Stabilize the fuel — Add fuel stabilizer to both the engine tank and the burner fuel tank. Stale fuel gums up carburetors and injectors.
  • Disconnect the battery — Or put it on a trickle charger. A dead battery in February means a late start to spring.
  • Cover the unit — A good tarp or enclosed trailer keeps out moisture, rodents, and UV damage.

Need a deeper walkthrough? Check out our winterization guide on the HotJet USA blog.

Common Mistakes That Kill Jetters Early

We’ve seen it all in 25+ years of building and servicing trailer mounted sewer jetters. Here are the mistakes that shorten equipment life the most:

  1. Running the pump dry — Even 30 seconds without water can score the pistons. Always check your water supply before firing up.
  2. Ignoring low oil warnings — Modern engines have shutoffs, but older units don’t. Check it daily.
  3. Skipping the inlet filter — Sand and grit from city water mains destroy pump valves. Use the filter. Replace it monthly.
  4. Not flushing after sewer jobs — Sewage left in the lines corrodes fittings and breeds bacteria. Flush with clean water after every job.
  5. Storing wet in winter — One freeze is all it takes to crack a pump head or heater coil. Drain and antifreeze every time.

Frequently Asked Questions

How often should I change the oil on my trailer jetter?

Monthly or every 50 hours of operation — whichever comes first. If you’re running it hard every day, check it daily and top off as needed. Engine oil is the cheapest maintenance you can do.

What’s the most important maintenance item on a hot water jetter?

The burner and heater coil. If the burner gets clogged with soot or the coil has scale buildup, your hot water jetter becomes a cold water jetter — and you lose the advantage on grease and bio-film jobs. Clean the burner weekly and descale the coil monthly.

Can I use my jetter in freezing temperatures?

Yes, but only if you take precautions. Hot water jetters actually perform great in cold weather because the heated water prevents freeze-ups during operation. Just make sure you drain and antifreeze the system when you’re done for the day.

Ready to Take the Next Step?

Call HotJet USA today at 1-800-624-8186 to talk with a jetter expert about maintenance, parts, or upgrading your equipment. Whether you need replacement nozzles, hose reel service, or you’re ready for a new HotJet II trailer jetter, we’ve got you covered. Visit hotjetusa.com to explore our full lineup.

HotJet USA is the manufacturer of trailer mounted sewer and drain line jetters. For over 25 years, we’ve specialized in hot and cold water hydro jetting equipment — trailer mounted, skid mounted, and truck mounted. We also offer comprehensive jetter training classes. Call today for expert advice!