CA-3504-1MAK Gas Pressure Washer — CA Aluminum Series 3500 PSI with Kohler CH440
The CA-3504-1MAK produces 3500 PSI at 3.5 GPM — 12,250 cleaning units — from a 429cc Kohler CH440 OHV engine paired with an AR crankshaft pump on Mi-T-M's 125-lb aluminum frame. The CH440 is Kohler's largest single-cylinder commercial engine, providing the displacement reserve needed to maintain rated 3500 PSI / 3.5 GPM output under sustained load in hot ambient conditions. All three CA-3504 standard variants — Honda GX390 (1MAH), Kohler CH440 (1MAK), Mi-T-M OHV (1MAM) — produce the same output from the same frame. The 1MAK is the choice for operations with established Kohler dealer relationships or with the CH440 already in their equipment fleet. ETL listed for US commercial use.
CA-3504-1MAK Engine Specifications and Aluminum Frame
The Kohler CH440 displaces 429cc — notably larger than the Honda GX390's 389cc — which provides additional torque reserve at the high end of the pressure range. At 12,250 CU the CA-3504 handles work that overtaxes the CA-3003: removing heavy equipment fouling in single passes, stripping loose coatings from masonry, and washing large commercial vehicle fleets efficiently. The 125-lb aluminum frame with 13-in flat-free tires handles rough job-site terrain that can stop smaller-wheeled units.
3500 PSI at 3.5 GPM (12,250 CU) — 36% more cleaning power than the CA-3003; single-pass effectiveness on heavy equipment fouling
AR crankshaft pump, forged brass manifold, thermal relief valve — AR rated for sustained 3500 PSI; brass handles mineral-rich water; thermal valve protects pump seals
125-lb corrosion-resistant aluminum frame, 13-in flat-free tires — lighter than steel-frame equivalents; larger tires handle rough terrain better than the 10-in tires on lower CA models
ETL listed, patented vibration isolation plate — ETL certification for commercial procurement; vibration plate extends pump seal life
50-ft × 3/8-in hose, 48-in lance — 48-in reach for elevated surfaces and equipment; CX-0098 External Bypass available separately
CA-3504-1MAK Applications and Environments
Operations running Kohler-powered generators, line stripers, or floor sweepers add the CA-3504-1MAK to standardize their CH440 parts shelf across equipment categories. Fleet maintenance departments that service vehicles with heavy road salt deposits, mud, and industrial coating residue rely on the 12,250 CU output for single-shift completion of washing cycles. Construction firms use it for concrete form stripping and equipment prep. Agricultural operations apply it to post-harvest equipment cleaning where caked grain, silage, and fertilizer residue require sustained high-pressure output. Industrial plants use it for machinery washdown between production cycles.
CA-3504-1MAK GPM, PSI, and Nozzle Configuration
Rated at 3.5 GPM at 3500 PSI (12,250 cleaning units) at rated flow. Includes quick-connect nozzles in 0°, 15°, and 25° patterns; 50-ft × 3/8-in non-marking high-pressure hose; 48-in lance with insulated trigger gun. Cold water only. 49-state engine — not for sale in California.
"1 Year Unloader, 3 Year Honda Engine, 7 Year Pump"
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We supply contractors, restoration companies, property managers, schools, government agencies, and other tax-exempt organizations.
How to place a tax-exempt order:
Write to us through our Contact Us page or email info@uscleaningtools.com and attach your valid tax exemption certificate (state resale or exemption certificate).
We verify your certificate and mark your account tax-exempt — usually within one business day.
Place your order and sales tax will not be charged.
For volume pricing or purchase orders, call +1 (978) 295-7538.
Shipping & Returns
Free shipping on most brands for orders over $300, delivered to the lower 48 states. Any brand-specific freight rate is shown at checkout before you pay.
Processing & delivery: in-stock orders are processed within 1–2 business days and typically deliver in 5–7 business days. Tracking is emailed within 24 hours of shipment. Built-to-order and backordered equipment shows its lead time on this page.
Freight deliveries: inspect your equipment on arrival and note any damage on the delivery receipt. Items damaged in transit or defective on arrival are fully covered at no cost to you.
Cancellations: cancel any time before your order ships for a full 100% refund.
30-day returns: return unused equipment in its original packaging within 30 days of delivery. Change-of-mind returns are subject to a restocking fee. To start a return, email info@uscleaningtools.com or call +1 (978) 295-7538.
How does the Kohler CH440 (429cc) compare to the Honda GX390 (389cc) on the CA-3504?
Both engines drive the same AR pump to 3500 PSI / 3.5 GPM (12,250 CU). The CH440's 429cc displacement is 10% larger than the GX390's 389cc, providing additional torque reserve under sustained heavy load or in high ambient temperatures. Choose based on your preferred service network: CH440 for Kohler dealer preference, GX390 for Honda dealer preference.
What is the cleaning unit output of the CA-3504-1MAK?
The CA-3504-1MAK produces 3500 × 3.5 = 12,250 cleaning units. This is 36% more than the CA-3003 series (9,000 CU), which translates to single-pass effectiveness on heavily fouled surfaces that required multiple passes from the CA-3003.
Is the CA-3504-1MAK ETL listed?
Yes. The CA-3504-1MAK carries ETL listing from Intertek, confirming it meets applicable US safety standards. ETL listing is accepted by local inspection authorities and is equivalent in standing to UL listing for commercial equipment procurement.
What bypass system is available for the CA-3504-1MAK?
The CX-0098 External Bypass System is available for the CA-3504 frame and must be ordered with the unit. It allows additional water flow through the AR pump during trigger-closed idle periods, preventing heat build-up that can damage pump seals at sustained 3500 PSI operating pressure.
Can the CA-3504-1MAK be sold in California?
No. The 429cc Kohler CH440 is a 49-state engine that does not comply with California CARB small engine emissions regulations. The CA-3504-1MAK cannot be sold or registered for use in California.
Why does the CA-3504 frame use 13-in tires instead of 10-in?
The larger 13-in flat-free tires are proportionally matched to the heavier 125-lb frame weight and the rougher terrain that CA-3504 users typically encounter at construction sites and industrial facilities. The larger wheel diameter provides better ground clearance and reduces resistance over gravel, pavement cracks, and thresholds compared to the 10-in tires on the lighter CA-2403 through CA-3003 models.
Frequently Asked Questions
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We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.
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Your credit/debit card or PayPal account will be charged when you place your order. Secure payment processing protects your information.
3. Will I receive an order confirmation?
Yes, a confirmation email will be sent to the provided email address once the order is placed.
4. How long does it take to process an order?
Orders are processed within 1-2 business days and then prepared for shipment.
5. How long does it take for my order to arrive?
Estimated arrival time (ETA) is 5-7 business days for all orders.
6. Do you offer warranty?
All our products come with a manufacturer warranty of at least 1 year, depending on the brand.
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