CAT Pumps

Ask anyone who runs a car wash what pump has been in the bay for twenty years and the answer is usually CAT. These pumps cost more up front and earn it back in years of service, which is exactly the math a working outfit should be doing. Sun Brite Supply sells CAT pumps for pressure washers, wash bays, and misting systems, from 2 GPM electric units to 10 GPM industrial piston pumps. Call 301-519-9274 before you buy and we will make sure the shaft, RPM, and flow actually fit your setup.

Why CAT Pumps Cost More and Last Longer

CAT Pumps has built high pressure triplex pumps in Minnesota since 1968, and the design philosophy has not changed: heavy crankcases, oversized bearings, and wet ends built to be rebuilt instead of replaced. Where a bargain pump is engineered to survive the warranty, a CAT is engineered to survive the operator. The catch is that CAT makes two very different kinds of pump, and picking the wrong kind wastes the premium you paid.

Piston or Plunger: Two Different Animals

CAT piston pumps, like the 270, 290, 550, and 1050, run cupped pistons at low RPM, often under 1,500. The cups ride the cylinder walls, tolerate marginal water, and can be renewed with a cheap cup kit almost forever. That is why self-serve car washes and wash bays that run all day standardize on them. They top out at moderate pressure, in the 1,000 to 3,000 PSI range. CAT plunger pumps, like the DX series and the 2SF line, drive ceramic plungers through fixed seals. They reach higher pressure, run at direct-drive speeds, and bolt straight to a gas engine or electric motor. For a contractor's 4,000 PSI rig, a plunger pump like the 67DX is the pick. For a bay that runs eight hours a day at 1,500 PSI, the piston pump wins on lifetime cost every time.

CAT Pump Lineup

Availability moves fast on the bigger pumps, so call for lead times. We also stock seal kits, cup kits, and the seal case tools that make CAT rebuilds go right.

From the Field

The mistake that ruins more new CAT pumps than anything else costs nothing to avoid: they ship dry. No oil in the crankcase. Fill it with CAT's specified crankcase oil before the first start, not whatever 30 weight is on the shelf, and check the sight glass like you check your gas gauge. The second lesson comes from our parts counter. A $34.80 cup kit for the 280 and 290 is the entire reason those piston pumps run for decades, so budget a rebuild every couple of seasons instead of a replacement every few years. And when you do a wet end job, use the factory seal case tool. Prying seal cases with a screwdriver scars the aluminum and creates the leak you were trying to fix.

Related Collections

• CAT pump parts for seal kits, cups, and plungers
• All pressure washer pumps
• General Pumps
• AR Pumps
• Comet Pumps and Giant Pumps
• Udor Pumps
• Pumps Made Ready, assembled and tested before pickup
• Unloader valves and pump oils
• Electric pressure washer pumps
• Compare in person at our Gaithersburg store

Frequently Asked Questions

Are CAT pumps worth the extra money?

If the machine earns money or runs long hours, yes. A CAT typically outlives cheaper pumps several times over and rebuilds with inexpensive kits. For a homeowner machine that runs ten hours a year, a mid-priced pump makes more sense.

What is the difference between CAT piston and plunger pumps?

Piston pumps run cupped pistons at low RPM, shrug off long duty cycles, and rebuild with cheap cup kits, but stay at moderate pressure. Plunger pumps push ceramic plungers through fixed seals, hit 4,000 PSI and up, and mount directly to engines and motors.

Do new CAT pumps come with oil?

No. Every new CAT pump ships with a dry crankcase. Fill it with the specified CAT crankcase oil before the first start or the warranty conversation gets short.

How do I match a CAT pump to my engine or motor?

Match four things: shaft size and style, RPM, flow, and pressure. A 3/4" or 1" hollow shaft fits gas engines, 5/8" fits electric motors, and solid shaft models take pulleys. Give us the motor nameplate and we will confirm fit before you order.

Can CAT pumps handle hot water?

Standard models want cool inlet water, but hi-temp versions like the 2SFX30ESV3 are built for feeds up to 190 degrees with stainless valves and upgraded seals. Feeding hot water to a cold water pump is the fastest way to eat seals.

How long does a CAT pump last?

In car wash service, piston models routinely run ten to twenty years with cup and seal service along the way. On contractor rigs, plunger models regularly outlast two or three of the machines they were bolted to.

Do you stock CAT repair parts too?

We carry CAT pump parts including seal kits, cup kits, plungers, and the seal case tools, and we can walk you through a rebuild over the phone at 301-519-9274.