Mobile Diesel & Heavy Equipment Repair in North Plainfield, NJ

If you need a diesel mechanic in North Plainfield, NJ, we come to you 24/7. KS Diesel On-Site Repair handles breakdowns on Route 22, Watchung Avenue, and Greenbrook Road, serving contractors, fleets, and heavy equipment operators.

From semi truck air leaks to excavator no-starts and reefer failures, we fix it fast and on-site.

About Us

Why Choose KS Diesel in North Plainfield, NJ ?

We deliver expert-level mobile diesel repair, fully on-site, for North Plainfield’s contractors, fleets, and operators.

100% ON-SITE REPAIRS

All repairs are done at your location. No towing, no waiting, and no shop delays.

24/7 EMERGENCY RESPONSE

Breakdowns don’t wait. We’re available nights, weekends, and holidays.

1-YEAR WORKMANSHIP WARRANTY

Every repair is backed by a full 12-month workmanship guarantee.

WE FIX IT ON-SITE

No need to move your truck or equipment. We repair it right where it sits.

ASE-CERTIFIED TECHNICIANS

Repairs are performed by skilled, experienced, ASE-certified diesel mechanics, guaranteed.

Our Services

Our Mobile Diesel & Equipment Repair Services in North Plainfield, NJ

We provide full-service, on-site diesel and equipment repair in North Plainfield, tailored for construction crews, fleet managers, and contractors who can’t afford downtime.

Heavy Equipment Repair

We repair excavators, skid steers, backhoes, loaders, and more, directly on the job site. Whether you're working along Route 22 or at a local construction project off Greenbrook Road, our team comes equipped to handle everything from electrical issues to hydraulic failures.

Mobile Truck Repair

From semi trucks to box trucks, we repair all diesel makes and models where they sit. We fix electrical faults, starting issues, brakes, and AC problems on-site. Fast response for local operators and fleets.

Roadside Assistance

Stuck on Route 22, Rock Avenue, or near the Route 287 merge? We provide 24/7 roadside repair for diesel trucks, reefers, and trailers. From jump starts to air brake fixes, we’ll get you moving again.

Line Boring

We offer precision line boring services for worn-out bores on heavy equipment frames, arms, and joints. On-site machining saves time and avoids expensive replacements.

Welding & Fabrication

Broken brackets, cracked frames, or damaged trailers? Our mobile welding unit handles all types of repairs in the field. Structural, safety-critical, and custom fabrication jobs done on-site.

Hydraulic Hose Repair

Leaking or burst hydraulic lines can stall your excavator or loader. We cut and crimp custom hoses on-site to minimize downtime.

Diagnostics & Electrical Repair

We use advanced diagnostic tools to pinpoint engine problems, regen issues, and electrical faults. We read fault codes and get straight to the fix.

PM Service (Preventative Maintenance)

Keep your fleet running strong with our preventive maintenance program. Regular oil changes, filters, inspections, and service logs, done on-site, on your schedule.

Fleet Maintenance

We work with local contractors, delivery companies, and service providers to manage entire diesel fleets. You schedule it. We handle the rest.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in North Plainfield, NJ

Breakdowns happen when you least expect them. If your truck won’t start, your hydraulic line blows at a job site, or your trailer brakes lock up, we’ll be there, fast. Our emergency service covers:

We Handle All Emergency Situations

We come prepared to get your machine running again on the spot. No shop. No wait. Just real repairs when you need them most.

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!!!!!!

Industries We Serve in North Plainfield, NJ

We proudly support local operations in:

If your work relies on diesel trucks, trailers, or machines, we’re the local mobile team that keeps your fleet on the move.

Gallery

Our Recent Works

Mobile Diesel Repair Near you

Neighborhoods We Serve in North Plainfield, NJ

We serve all areas within North Plainfield, including:

Watchung Heights
Green Brook Estates
Vermeule Park Area
Rockview Gardens
West End Avenue Area
Johnston Drive Area
Grove Street Sector

If you’re located anywhere within North Plainfield, we come directly to your location.

Mobile Diesel Repair in North Plainfield, NJ

Request a Free Estimate

When downtime isn’t an option, call the local experts at KS Diesel On-Site Repair. offer full-service diesel mechanic and mobile truck repair services that get you moving again.