Mobile Diesel & Heavy Equipment Repair in Warren, NJ

Need a mobile diesel mechanic near Warren? KS Diesel On-Site Repair provides 24/7 expert truck and heavy equipment repairs right at your job site or roadside.

From breakdowns on Mount Bethel Road to diagnostics off King George Road, we serve the entire with fast, on-site service.

About Us

WHY CHOOSE KS DIESEL IN Warren, NJ?

We bring the shop to you, no towing, no delays. Just expert diesel repair, right where you are.

100% ON-SITE REPAIRS

All repairs are done at your job site, roadside, or fleet yard, no shop delays or towing required.

24/7 EMERGENCY SERVICE

Breakdowns don’t wait. We’re ready day or night.

1-YEAR WORKMANSHIP WARRANTY

We stand behind every repair with a full year of guaranteed quality.

TRUCKS, TRAILERS & EQUIPMENT

From loaders to reefers to semis — we fix it all, mobile and on-site.

ASE-CERTIFIED TECHNICIANS

Skilled, experienced, ASE-certified diesel mechanics handle every repair, guaranteed.

Our Services

Our Mobile Diesel & Equipment Repair Services in Warren, NJ

At KS Diesel, we handle everything from emergency roadside repairs to scheduled fleet maintenance, all on-site in Warren.

Heavy Equipment Repair

We repair excavators, skid steers, backhoes, loaders, and forklifts right at your job site. From hydraulic leaks to fuel issues, we keep your earth-moving equipment running in Warren’s construction zones.

Mobile Truck Repair

Whether your semi truck won’t start near Washington Valley Road or your trailer has air brake issues on I-78, we’ll fix it on the spot. We service reefers, trailers, box trucks, and more.

Roadside Assistance

Breakdowns don’t wait. Neither do we. From battery issues to fuel system failures, we’ll respond anywhere in Warren—fast.

Line Boring

We provide precision line boring for worn bores in loaders, backhoes, and more. All work is done mobile, saving Warren contractors time and towing costs.

Welding & Fabrication

Need on-site welding? We fabricate and repair buckets, frames, trailers, and more in Warren job sites and yards.

Hydraulic Hose Repair

Blown hydraulic line? We make custom hydraulic hoses on-site. Serving equipment operators across Warren Township’s construction and industrial sectors.

Diagnostics & Electrical Repair

We use OEM-level tools for accurate diesel diagnostics on trucks and equipment. Quick, clear answers to your check engine light or electrical fault.

PM Service (Preventative Maintenance)

Keep your fleet running in top shape. We offer oil changes, inspections, and full PM service for Warren trucking fleets and contractors.

Fleet Maintenance

Downtime costs money. We offer scheduled fleet service for Warren-based trucking companies and municipal fleets.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in Warren, NJ

Your truck won’t wait. Neither do we.

We respond fast, whether you’re broken down on Interstate 78, near Mount Horeb Road, or behind schedule on a construction site near Stirling Road. We fix:

No-start conditions
Air leaks
Fuel system problems
AC failure
Electrical shorts
Trailer lighting & brake issues
Heavy equipment breakdowns
Forklift repair & hydraulic leaks

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!!!!!!