JP-3504-3MHB Gas Pressure Washer — JP Series 3500 PSI, 3.5 GPM with Honda GX390
The Mi-T-M JP Series JP-3504-3MHB is the highest-output model in the JP direct-drive line, producing 3,500 PSI at 3.5 GPM — 12,250 cleaning units — powered by a 389cc Honda GX390 OHV engine and an AR crankshaft pump. At 36% more cleaning units than the JP-3003 (9,000 CU), the JP-3504 handles sustained heavy equipment washing, concrete stripping, and fleet cleaning where lower-output models work too slowly. The Honda GX390 is Honda's commercial heavy-duty single-cylinder, used in compactors, concrete saws, and high-flow pumps.
JP-3504-3MHB High-Output Configuration
The 3.5 GPM flow rate combined with 3,500 PSI is the critical specification for operators who prioritize throughput — more GPM means more water volume rinsing the surface per pass, which accelerates cleaning on large surface areas more than additional PSI alone.
3,500 PSI at 3.5 GPM (12,250 CU) — handles fleet washing, concrete stripping, and heavy agricultural equipment at commercial throughput
389cc Honda GX390 OHV engine — Honda's commercial heavy-duty single-cylinder with 11.7 ft-lbs torque; adequate for sustained 3.5 GPM pump operation without load drop
AR crankshaft pump — triplex ceramic plunger pump; rated for high sustained flow rates and extended daily use
48-inch lance — longer reach than 36-inch for working at distance on tall equipment and vehicle sides
50-foot non-marking hose — covers full vehicle wash bays and equipment rows from one position
Fleet maintenance operations washing Class 6–8 trucks and trailers find the 12,250 CU output reduces wash time meaningfully versus 9,000 CU machines. Concrete contractors stripping cured form oil and mineral bond from foundation walls use the 3,500 PSI to cut through residue that 3,000 PSI units work too slowly on. Agricultural cooperatives washing large grain combines and field equipment benefit from the 3.5 GPM flow rate moving mud and crop residue efficiently. County road departments and utility maintenance fleets running regular equipment wash stations find the Honda GX390 straightforward to service in-house.
JP-3504-3MHB GPM, PSI, and Nozzle Configuration
Rated at 3.5 GPM at 3,500 PSI (12,250 cleaning units) at rated flow. Includes 0°, 15°, and 25° quick-connect nozzles; 50-foot × 3/8-inch non-marking hose; 48-inch lance with insulated trigger gun. Cold water only. 49-state Honda GX390 — not for sale in California.
"1 Year Unloader, 3 Year Honda Engine, 7 Year Pump"
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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 JP-3504-3MHB compare to the JP-3003-3MHB?
The JP-3504 adds 500 PSI and 0.5 GPM more flow, producing 12,250 vs 9,000 cleaning units — 36% more productivity. It also steps up to the Honda GX390 (389cc) from the GX270 (270cc). Step up when fleet washing or concrete stripping throughput on the JP-3003 is too slow.
Is the JP-3504-3MHB the same as the JP-3504-3MMB in batch 073?
Performance is identical: both produce 3,500 PSI at 3.5 GPM through the same AR crankshaft pump. The 3MHB uses a Honda GX390; the 3MMB in batch 073 uses a 420cc Mi-T-M OHV. Choose based on engine service preference.
What oil does the Honda GX390 require?
Honda specifies SAE 10W-30 for the GX390. Oil capacity is approximately 1.16 quarts. Change at 5-hour break-in, then every 100 hours. The GX390 does not include a low-oil shutoff in all configurations — check the oil level before every use.
Is the JP-3504-3MHB available for California?
No — the Honda GX390 is a 49-state non-CARB engine. Contact Mi-T-M for California-compliant configurations.
Can the JP-3504-3MHB run a surface cleaner?
Yes — a 18–21 inch surface cleaner rated for 3,500 PSI and up to 3.5 GPM is compatible. Match the surface cleaner's flow requirement to this unit's 3.5 GPM output for balanced spin speed and cleaning coverage.
What is the lance length and why is it longer than lower JP models?
The JP-3504 includes a 48-inch lance (vs 36-inch on lower-output JP models). The longer lance is standard on higher-output models to provide working distance from the surface — at 3,500 PSI, maintaining distance protects surfaces and reduces operator fatigue from spray deflection.
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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