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Mi-T-M CM-4200-0MMB Gasoline Pressure Washer – 4200 PSI, 3.4 GPM, 14280 CU

Mi-T-M CM-4200-0MMB Gasoline Pressure Washer – 4200 PSI, 3.4 GPM, 14280 CU

Brand: Mi-T-MSKU: CM-4200-0MMBIn Stock – Ready to Ship
$2,171.00

Ships from US manufacturer with factory warranty

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CM-4200-0MMB Gas Pressure Washer — 4200 PSI ChoreMaster for Heavy Equipment Washing

The Mi-T-M ChoreMaster CM-4200-0MMB is the highest-output model in the ChoreMaster line, producing 4,200 PSI at 3.4 GPM — 14,280 cleaning units. Powered by a 420cc Mi-T-M OHV engine and a crankshaft pump built for sustained commercial duty, it handles fleet washing, heavy construction equipment, and concrete surface stripping where the 3,600 PSI model works too slowly. Cold water only; for grease and petrochemical removal, pair it with a chemical injector and appropriate detergent.

CM-4200-0MMB Cleaning Power and Engine Comparison

The 420cc displacement is nearly double the CM-3000's 212cc engine — the added torque reserves allow the pump to maintain rated pressure through surface cleaners and turbo nozzle attachments without the engine laboring.

  • 4,200 PSI at 3.4 GPM (14,280 CU) — handles concrete stripping, fleet washing, and rust removal tasks that require sustained high pressure over large surface areas
  • 420cc Mi-T-M OHV engine — Mi-T-M's largest single-cylinder OHV; more torque reserve than the 300cc CM-3600 engine, critical when running surface cleaner attachments that add load
  • Mi-T-M crankshaft pump — commercial-duty triplex design; brass manifold, thermal relief valve, in-line water strainer standard
  • Adjustable pressure unloader — allows pressure reduction for vehicle washing and painted surfaces without nozzle changes
  • 10-inch flat-free tires — stable on gravel lots, construction debris, and loading dock surfaces
  • Mi-T-M Pressure Relief Start — reduces compression during pull-starting; easier cold starts on heavy-displacement engines

CM-4200-0MMB Applications and Environments

Fleet maintenance operations washing semi-trucks, trailers, and heavy equipment will find the CM-4200-0MMB sustains the output needed for full-vehicle washing without the duty-cycle limitations of a smaller engine. Construction contractors use it for post-pour concrete form cleaning and foundation prep where cured concrete residue requires maximum PSI. Municipalities and county road departments running equipment wash stations keep these units for seasonal cleaning of plow trucks, road graders, and utility vehicles. The 142 lb unit fits a standard job trailer but requires a minimum two-person loading.

CM-4200-0MMB GPM, PSI, and Nozzle Configuration

Rated at 3.4 GPM at 4,200 PSI (14,280 cleaning units) at rated flow. Includes 15°, 25°, and detergent quick-connect nozzles; 50-foot × 3/8-inch wire-braided hose; 36-inch two-piece lance with trigger gun. Cold water only. Not for sale in California without CARB-compliant engine — consult factory.

Specifications

PSI 4,200 PSI at rated flow
GPM 3.4 GPM
Cleaning Units 14,280 CU (PSI × GPM)
Engine 420cc Mi-T-M OHV
Pump Type Mi-T-M Crankshaft
Unloader Adjustable Pressure
Hose 50 ft × 3/8 in wire-braided
Nozzles Included 15°, 25°, detergent
Net Weight 142 lbs
Dimensions (L × W × H) 40 × 22.5 × 24.5 in
Hot/Cold Cold water only
California Sale Not for sale in CA (non-CARB); consult factory

Documents

Spec Sheet
Manual

Product Warranty Information

"1 Year Pump, 3 Year Engine"

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:

  1. 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).
  2. We verify your certificate and mark your account tax-exempt — usually within one business day.
  3. 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.

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Frequently Asked Questions

What cleaning surfaces is the CM-4200-0MMB rated for?
At 4,200 PSI and 14,280 cleaning units, this unit handles concrete stripping, cured form release agent removal, heavy equipment washing, and rust-stained masonry. For delicate surfaces, reduce pressure with the adjustable unloader and use the 25° nozzle.
How does the CM-4200-0MMB differ from the CM-3600-0MMB?
The CM-4200 adds 600 PSI, 0.6 more GPM, and a 420cc engine vs the 300cc in the CM-3600 — resulting in 14,280 vs 10,080 cleaning units (41% more output). The 420cc engine also provides more torque headroom when running surface cleaner attachments.
Can the CM-4200-0MMB run a surface cleaner attachment?
Yes — the 420cc engine and crankshaft pump are sized to handle surface cleaner attachments without load drop. Most 15–18 inch surface cleaners designed for 4,000+ PSI machines will work. Ensure the surface cleaner's flow rating does not exceed 3.4 GPM.
What is the unloader type and how do I adjust pressure?
The CM-4200-0MMB uses an adjustable pressure unloader. Turn the adjustment knob clockwise to increase pressure, counterclockwise to decrease. Always adjust with the engine running and the trigger pressed to flow water — never adjust dry.
Is a 0° nozzle included?
No — the included nozzles are 15°, 25°, and detergent. A 0° (zero-degree) pinpoint nozzle is not included. Mi-T-M sells compatible quick-connect 0° nozzles separately; use with caution on soft surfaces as 4,200 PSI through a 0° nozzle can etch concrete and damage wood.
Is the CM-4200-0MMB available for sale in California?
The standard unit uses a 49-state Mi-T-M OHV engine not approved under CARB regulations. A CARB-compliant configuration is available through the factory — contact Mi-T-M or your authorized dealer before ordering for California.

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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