Simpson Cleaning PS3228 Fitting Size & Compatibility Guide
Factory uses M22-14mm. Highly recommended to convert to 3/8" QC for commercial duty.
What Are You Trying to Connect?
Direct compatibility rules and recommended hardware for standard pressure washing upgrades.
Standard 50ft Hose
Standard universal M22-14mm hoses (like UberFlex) screw directly onto your machine pump with zero adapters needed.
Foam Cannon Suction
1.25mm Orifice Jet
Snubby Detailing Gun
Aftermarket snubby guns with M22-14mm female inlets screw directly onto your stock or aftermarket hose.
Surface Cleaner Deck
Maximum recommended deck diameter: 15" Deck (4 × 2.45 = 9.8 in ideal; 15" with #2.0 bar nozzles) based on the 4-inches-per-GPM rule.
Engineering Specifications & True Working Pressure
Side-by-side analysis of manufacturer advertised marketing ratings vs. real-world dynamic flow physics.
| Specification Parameter | Advertised Factory Rating | True Dynamic Working Spec | Engineering Verification Details |
|---|---|---|---|
| Discharge Pressure | 3300 PSI | 3200 PSI | Advertised is static zero-flow peak; working spec is stabilized nozzle pressure. |
| Water Flow Rate | 2.5 GPM | 2.45 GPM | Measured at continuous operating load under standard atmospheric conditions. |
| Water Horsepower (WHP) | — | 4.57 WHP | Calculated via hydraulic equation: WHP = (PSI × GPM) / 1,714 |
| Motor / Engine Source | Honda GX200 196cc Commercial OHV Engine | ||
| Pump Outlet Thread | M22-14mm Male | Inner stem caliper pin: 14.0mm | |
| Pump Water Inlet | 3/4" GHT Garden Hose Swivel | Standard North American garden hose thread with mesh intake filter. | |
| Stock Hose Dimensions | 25 ft (5/16" ID MorFlex Hose) | Hose Ends: M22-14mm Female | |
| Spray Wand Outlet | 1/4" Brass Quick-Connect Coupler | Standard quick-connect accepts universal spray tips and accessories. | |
Mechanical Engineering Verdict on Power & Performance
Simpson rates the PS3228 at 3,300 PSI and 2.5 GPM, which is much closer to reality than consumer electric claims. Under steady cleaning with a calibrated #3.0 orifice nozzle, working output sits at 3,150 PSI at 2.45 GPM. That outputs a stout 4.50 Water HP via (3,150 × 2.45) / 1,714, using almost every bit of the Honda GX200's 5.5 net horsepower after mechanical pump drag.
Technical Fitting Schematic: M22-14mm Male
Mechanical cross-section detailing the stem pin caliper diameter, Viton O-ring compression channel, and thread pitch.
Engineer's Plug-and-Play Upgrade Bill of Materials (BOM)
Field-tested, zero-leak hardware parts specifically matched to the Simpson Cleaning PS3228.
ProPulse UberFlex 50ft 3/8" 3400 PSI Commercial Hose
Higher flow capacity minimizes pressure drop over long runs.
Heavy-Duty Stainless M22-14mm to 3/8" Quick-Connects
Provides fast snap-locking for commercial operators.
15" Stainless Steel Surface Cleaner
Perfect match for 2.5 GPM flow rate.
J-Rod 4-Way Soft Wash Nozzle Holder
Swaps instantly between high rinse, soap injection, and soft washing.
Field Diagnostics & Real-World Troubleshooting: Simpson Cleaning PS3228
Mechanical failure analysis and shop teardown solutions for common operating issues.
Shop Diagnostics & Service Notes
The Simpson PowerShot PS3228 pairs a commercial Honda GX200 196cc OHV engine with an AAA industrial triplex plunger pump featuring ceramic-coated pistons and a forged brass manifold. Unlike cheap axial pumps, this triplex unit uses an external adjustable unloader valve. Squeezing and dumping the trigger gun produces a momentary bypass pressure spike (ΔP spike) of 300 to 500 PSI as fluid diverts back into the suction loop. If an operator cranks down the unloader knob to cheat extra pressure, that bypass shock wave slams the Honda governor arm, stalls the engine, or balloons high-pressure hoses. Calibrating the unloader requires an inline 0-5000 PSI liquid-filled pressure gauge: dial spring tension until operating pressure reads 3,200 PSI at full 2.45 GPM flow, making sure spike pressure upon trigger release never tops 3,600 PSI. Service the Honda oil alert switch, clean the oiled foam pre-cleaner, and gap the NGK BPR6ES spark plug to 0.028-0.031″ every 100 hours.
The AAA triplex pump houses an independent oil crankcase isolated from the engine block. A common field disaster is pouring standard 10W-30 automotive detergent motor oil into the pump sight glass; detergent additives foam under splash lubrication, collapsing oil film strength and scorching the ceramic plunger packings. Always use non-detergent ISO 68 or SAE 30 industrial pump oil, filling until the bubble sits squarely on the red center dot of the glass sight window (roughly 8.5 fluid ounces). If the pump oil turns milky white, high-pressure water seals blew out, forcing pressurized water past the brass packing retainers. Never let the PS3228 idle off-trigger for more than 90 seconds. Recirculating bypass water heats past 140°F (60°C) from friction, forcing the brass thermal relief valve to purge boiling water onto the ground. Swap the factory M22-14mm outlet for a 3/8″ stainless steel quick-connect socket to eliminate Darcy-Weisbach friction loss and end thread galling.
Frequently Asked Questions: Simpson Cleaning PS3228
Quick mechanical answers for troubleshooting connections, leaks, and upgrades.
What oil should I put in the AAA triplex pump on the Simpson PS3228?
The pump requires non-detergent ISO 68 or SAE 30 industrial pressure washer pump oil, NOT automotive motor oil with detergent additives. Fill the pump crankcase until the level hits the red center dot of the rear glass sight window, which takes about 8.5 fluid ounces.
Why is water dumping out of a brass valve underneath my PS3228 pump?
The thermal relief valve is purging boiling water to protect the ceramic plunger packings from heat destruction. When you let the Honda engine run without spraying, trapped bypass water heats past 140°F (60°C) from friction, forcing the valve to open.
Why does my Honda GX200 engine stall or bog down when I release the spray trigger?
The unloader bypass valve is sticking or adjusted with excessive spring tension, creating a hydraulic backpressure spike that overwhelms the engine governor. Clean mineral scale from the unloader bypass piston, lubricate its seals, and back off the unloader adjusting knob slightly.
What does it mean if the oil in the AAA pump sight glass looks milky white?
Milky oil means water bypassed blown high-pressure packing seals or scored ceramic plungers into the pump crankcase. Shut the machine down immediately, replace the high-pressure packing V-rings, and refill the crankcase with fresh non-detergent ISO 68 pump oil.
Can I convert the Simpson PS3228 to 3/8-inch commercial quick-connect fittings?
Yes. Thread an M22-14mm female to 3/8-inch female NPT adapter onto the pump outlet and install standard 3/8-inch quick disconnects. Switching to 3/8-inch fittings cuts Darcy-Weisbach friction loss and saves time when wrapping commercial wire-braided hoses.