Mobile Diesel & Heavy Equipment Repair in Frenchtown, NJ

Need a mobile diesel mechanic near Frenchtown, NJ? KS Diesel On-Site Repair delivers fast, 24/7 truck, trailer, and heavy equipment repair right to your job site or breakdown location.

Whether you’re stranded on Route 29 or down a gravel path on a local excavation site, we’ll come to you.

About Us

Why Choose KS Diesel in Frenchtown, NJ ?

Built for Frenchtown. We show up fast, fix it right, and keep your equipment moving.

100% ON-SITE REPAIRS

We bring the repair shop directly to your location in Frenchtown.

24/7 Emergency Service

We are available anytime you need us, day or night.

1-YEAR WORKMANSHIP WARRANTY

We back every job with solid warranty coverage.

We Fix Diesel Engines, Hydraulics, Trailers and More

No-starts, leaks, or breakdowns, we handle it all.

ASE-Certified Diesel Mechanics

Trusted experts with real-world field experience.

Our Services

Our Mobile Diesel & Equipment Repair Services in Frenchtown, NJ

We bring the shop to you. Whether you’re on a job site, stuck roadside, or managing a fleet, we handle everything on-site with professional-grade equipment.

Heavy Equipment Repair

We service excavators, skid steers, backhoes, loaders, forklifts, and more across Hunterdon County. Whether you're grading near Everittstown Road or clearing land off Route 513, we keep your equipment running strong.

Mobile Truck Repair

Breakdowns happen, we handle semi trucks, box trucks, reefers, and trailers. On Route 29 or local roads, we fix electrical, air leaks, AC systems, brakes, and more. No shop needed.

Roadside Assistance

Stuck on the way to a job? Call us anytime. We cover the Route 12 corridor, Kingwood Avenue, and side roads across Frenchtown. Get back on the road fast with our emergency mobile diesel mechanic services.

Line Boring

We offer on-site line boring for damaged bores on heavy equipment. Perfect for worn pins and bushings on loaders, backhoes, and excavators.

Welding & Fabrication

Mobile welding services for cracked frames, trailers, or custom metalwork. Fast response anywhere in Frenchtown.

Hydraulic Hose Repair

Leaking or busted hoses? We build and replace custom hydraulic lines on-site. From compact equipment to large excavators, we keep your hydraulics sealed tight.

Diagnostics & Electrical Repair

We run full electronic diagnostics on heavy equipment and trucks using OEM-grade tools. Whether it’s engine codes, fuel systems, or emissions, we find and fix the issue fast.

PM Service (Preventative Maintenance)

Keep your machines on schedule with preventative maintenance: oil changes, filter swaps, inspections, and full service. Perfect for contractors and fleets in Frenchtown.

Fleet Maintenance

Serving local trucking and equipment fleets with scheduled maintenance and emergency support. Reliable, recurring service that keeps your operation smooth.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in Frenchtown, NJ

Whether your semi truck breaks down on Route 29, your excavator blows a hydraulic hose near Creek Road, or your fleet vehicle won’t start before a delivery, we’re on our way — fast.

Common emergency calls in Frenchtown include:

We arrive fast, fix it right, and back everything with a 1-year workmanship warranty.

What Our Customers Say

TESTIMONIAL

      EXCELLENT  
   Based on 30 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Howard Mcnabb 
 
 
 
 Trustindex verifies that the original source of the review is Google. I was stuck on 202  from last night and Kevin came and got me up and running this morning. And his prices  are reasonable .I would definitely go with him again
  
 
      Posted on Google  
   
   Nicholas Dessauer 
 
 
 
 Trustindex verifies that the original source of the review is Google. Kevin is a absolute amazing Mechanic!!!! We were coming back to Long Island fromKY and the Fan pulley went out on our 3500 diesel truck and he was able to get the parts and fix the truck and have us back on the road in very quick way. Excellent service and communication. Price was very reasonable and for a same day call and fix he did an Outstanding Job!!! Thank you again Kevin we appreciate you so much!!!!
  
 
      Posted on Google  
   
   Karam Bains 
 
 
 
 Trustindex verifies that the original source of the review is Google. I am from canada and got problem on my Columbia with Cat c15, twin turbo And looked for mobile service and got in touch with KS diesel in NJ he is the best guy I have ever met for mobile service , very much knowledgable and cool headed , not greedy Would recommend this guy to everyone, if you got any problem in Somerset NJ area call this guy 10/10 for price 10/10 problem solver
  
 
      Posted on Google  
   
   Eric Karstensen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Kevin is the best. Fast excellent work. Great on the road mechanic. Best prices around! Nice guy. Would recommend for all truck repairs. A++
  
 
      Posted on Google  
   
   Danny Guerrieri 
 
 
 
 Trustindex verifies that the original source of the review is Google. Awsome
  
 
      Posted on Google  
   
   ibrahim elhabbal 
 
 
 
 Trustindex verifies that the original source of the review is Google. Trust worthy, honest, genuine and very hard working. What else do you need from your mechanic. Always answers right away and gives you best recommendations!!!!!!