Pressure Washer Repair, Parts, and Rebuild Kits: What to Know Before You Call

Things break. In this line of work, what matters next is how quickly you get back up and running.

We’ve been around since 1987, and we repair and service pressure washers at Evans branches in Baton Rouge, Lafayette, Houston, New Orleans, and Corpus Christi. Those same branches support parts, accessories, and chemicals, and we build, rent, sell, and maintain Bean pump packages.

Need it fixed today?

Skip the reading. Call (800) 377-5872 and ask for the branch closest to your site.

Still diagnosing? Keep going. This page covers the faults that most often sideline pumps, what a repair involves, and how to order the right parts or rebuild kit the first time.

​Before You Call: Three Facts to Write Down

Pro tip: Before you call us or any other repair shop, write down the pump model, the symptom, and the date of the last seal and oil service. A technician can do a lot with those three facts.

Common Pressure Washer and Bean Pump Problems

A pump usually tells you what’s wrong before it quits. Each symptom points to a specific wear part, and the Cat Pumps troubleshooting guide for plunger and piston pumps maps them out. Here’s the short version.

Symptom	Likely cause	Fix
Low pressure at the gun	Worn nozzle, which Cat Pumps names as the most frequent cause	Replace the nozzle with the correct size. Leave the regulator alone: cranking it up to compensate will over-pressurize the pump.
Pressure falls, then the pump runs starved	Clogged or undersized inlet filter	Clean the filter and check the supply tank for debris.
Pulsation	Restricted inlet, air drawn into the line, or worn high-pressure seals	Seal the inlet connections and service the seals. Keep running on worn seals and you can erode the manifold.
Loud knocking	Cavitation from an inlet restriction or air leak	Walk the inlet side: filter, check valves, hose clamps, fittings.
Sudden loss of pressure	Unloader stuck open from a dirty or worn stem and piston	Pull the unloader apart, clean it, and replace what’s worn.
Engine bogs or stalls when you release the trigger	Unloader check valve stuck or worn	Install a check valve repair kit.
Water leaking between manifold and crankcase	Worn seals or packings	Install a seal kit at the first sign of low pressure.
Milky, foamy, or white crankcase oil	Water in the oil, from condensation or fluid passing worn seals	Shut it down. Find the source, drain the crankcase, clean the drive end, refill.

Why You Shouldn’t Run Through a Pressure Drop

Don’t run through a pressure drop. Low pressure can be the first sign of worn high-pressure seals. Keep it running, and water works back along the plunger rods toward the crankcase, where it can score the plungers and contaminate the oil. A seal kit at the first drop costs far less than that.

Six conditions speed up seal and valve wear: abrasives in the liquid, excessive heat, cavitation, starvation, harsh chemicals, and hard water. The same guide says to clean inlet filters more often when the liquid is recycled or dirty. If your washer feeds from a closed-loop wash system, move that filter check up your list.

​How Humidity Puts Water in Your Pump Oil

Humidity matters here too. Humid air condensing inside the crankcase can be a cause of water in the oil. The fix is to keep the pump out of direct spray, use a ventilated enclosure if it runs in wet conditions, and check the sight glass for milky oil.

Bean pumps are reciprocating pumps too. They take on the heavy work, like tank cleaning, barge flushing, hydro-excavation, and pipe cleaning, and they wear in the same places. FMC/John Bean kits typically come as separate packing kits and valve kits by pump model.

Repair and Maintenance Options

You have two ways to work with us: call when something breaks, or put the machine on a schedule, so it’s less likely to break down. Both run through our Service & Maintenance program.

Repairs with Evans

We handle local pressure washer service and repair at our maintenance branches. If it’s urgent, call. Our technical support team answers 24/7. Call at 2 AM if that is when equipment goes down. We’ll troubleshoot over the phone or dispatch a technician to your site. You’ll get a quote before we touch anything, whether it’s equipment we built and installed or other equipment on your site. Drop it off at a branch, or we’ll come to you.

Scheduled Maintenance Program

A technician works through a checklist built for your system: pumps, motors, belts, valves, and control panels, plus filters and strainers. Plan on at least 2 hours for a pressure washer and wash bay. You end the visit with photos and a maintenance sheet on file, ready for the next audit.

Rental Units

We service rental equipment under the terms of your agreement. Just like when you rent a car, daily and weekly upkeep is your responsibility during a rental. If your own machine is down and the job can’t wait, rent one while it’s in the shop. The rental lineup runs from 3,000 to 5,000 PSI hot water units to a 23 GPM Bean pump system, with techs on call while you run it.

Finding Pressure Washer Parts and Rebuild Kits

Order by pump model. Kits are built for specific pumps, so the data plate on the pump often matters more than the logo on the frame. One valve kit could be listed on six pump models. “Rebuild kit” can mean a seal kit, a valve kit, or both.

Before you pay for a kit, ask which of those parts are in the box. Some suppliers sell plungers apart from the seal kit and direct owners to replace a scored plunger along with the seals.

Need parts in south Louisiana or the Houston area? Start with your nearest Evans branch. Our Baton Rouge, Lafayette, and Houston teams support parts, accessories, and chemicals. We sell Hotsy and HyproTek pressure washers.

Find a Repair Branch Near You

Call a branch, and you’ll reach real people who live and work on the Gulf Coast. Find yours below.

Branch	Address	Hours (Mon to Fri)	Phone
Baton Rouge	8846 South Choctaw, Baton Rouge, LA 70815	8 AM to 5 PM	(337) 837-3015
Houston	205 North 11th St, La Porte, TX 77571	7 AM to 4 PM	(713) 451-1162
Lafayette	233 Tubing Road, Broussard, LA 70518	8 AM to 5 PM	(337) 837-3015

In the Houston area, we work out of La Porte, and that branch has a dedicated service coordinator for industrial and commercial pressure washer repair calls. We also run service centers for New Orleans and Corpus Christi.

Somewhere else? Call the main line at (800) 377-5872. We support projects across the United States through our regional teams.

Frequently Asked Questions about Pressure Washers and More