CA-4004-1MAK Gas Pressure Washer — CA Aluminum Series 4000 PSI with Kohler CH440
The CA-4004-1MAK produces 4000 PSI at 3.5 GPM — 14,000 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 and torque reserve appropriate for sustained 4000 PSI output. Among the four CA-4004 standard engine variants, the 1MAK is the choice for operations with Kohler dealer accounts, for facilities that maintain CH440-powered equipment, or for buyers who prefer Kohler's commercial engine warranty terms. ETL listed for US commercial use.
CA-4004-1MAK Engine Selection and Output
At 14,000 CU the CA-4004 handles applications beyond the CA-3504's capacity — stripping loose coatings from masonry, removing dense industrial fouling from equipment, and sustaining high cleaning output across large vehicle fleets. The Kohler CH440 at 429cc is the largest available engine on the CA-4004 frame. Its cast-iron cylinder liner and full-pressure lubrication system are the same construction features used in Kohler commercial engines rated for high-hour industrial applications.
4000 PSI at 3.5 GPM (14,000 CU) — maximum standard output in the CA Aluminum Series; handles coating stripping, dense industrial fouling, and large-fleet washing
ETL listed, vibration isolation plate — ETL certification for commercial procurement; vibration plate reduces pump seal wear
50-ft × 3/8-in hose, 48-in lance, CX-0098 External Bypass available — complete kit; bypass ordered separately and installed at point of sale
CA-4004-1MAK Applications and Environments
Operations with Kohler-powered floor sweepers, compressors, or aerial work platforms add the CA-4004-1MAK to unify their engine inventory: one parts supplier, one oil specification, one service technician across equipment categories. Heavy industrial cleaning contractors use the 14,000 CU output for applications requiring more than one pass from the CA-3504. Fleet operations washing tanker trucks, buses, and heavy-duty trailers rely on the 4000 PSI output for efficient removal of road salt, diesel exhaust deposits, and oil contamination. Construction firms apply it to concrete surface preparation and equipment cleaning before redeployment.
CA-4004-1MAK GPM, PSI, and Nozzle Configuration
Rated at 3.5 GPM at 4000 PSI (14,000 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"
B2B & Tax-Exempt Purchases
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.
Why choose the Kohler CH440 (1MAK) over the Honda GX390 (1MAH) on the CA-4004?
Both produce 4000 PSI / 3.5 GPM (14,000 CU) from the same 125-lb aluminum frame with an AR pump. Choose 1MAK if your operation maintains Kohler CH440 engines in other equipment (standardizing parts and service) or if your regional Kohler dealer offers faster service than Honda alternatives. Both carry ETL listing.
What displacement does the Kohler CH440 have and why is it specified for 4000 PSI?
The Kohler CH440 displaces 429cc — the largest single-cylinder commercial engine in Kohler's CH series. At 4000 PSI the AR pump draws significantly more torque than at 3000 PSI. The CH440's displacement provides the torque reserve needed to maintain rated 3.5 GPM flow under sustained heavy load without lugging or overheating.
What is the output comparison between the CA-4004-1MAK and the CA-3504-1MAK?
The CA-4004-1MAK produces 4000 × 3.5 = 14,000 CU. The CA-3504-1MAK produces 3500 × 3.5 = 12,250 CU. The CA-4004 delivers 14% more cleaning output from the same frame and pump type, driven by 500 more PSI and the CH440's larger displacement over the 1MAK's prior CH440 configuration.
Can the CA-4004-1MAK be sold or operated in California?
No. The 429cc Kohler CH440 is a 49-state engine that does not comply with California CARB small engine emissions standards. The CA-4004-1MAK cannot be sold or registered for use in California.
Is the CA-4004-1MAK ETL listed?
Yes. The CA-4004-1MAK carries ETL listing from Intertek. This confirms the unit meets applicable US safety standards and is accepted by local inspection authorities for commercial use, equivalent to UL listing.
What bypass system does the CA-4004-1MAK use?
The CX-0098 External Bypass System is available for the CA-4004-1MAK and must be ordered with the unit. It routes additional water through the AR pump when the trigger is closed, preventing heat build-up in the pump head at sustained 4000 PSI operating pressure.
Frequently Asked Questions
1. What payment methods can I use?
We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.
2. When will my payment be processed?
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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