Mobile Diesel & Heavy Equipment Repair in Millstone, NJ

Need a mobile diesel mechanic in Millstone, NJ?
KS Diesel On-Site Repair delivers fast, 24/7 on-site repair for diesel trucks, trailers, and heavy equipment, wherever you are in Millstone.

From breakdowns on Stage Coach Road to fleet issues near Sweetmans Lane, we’ve got your equipment covered. Serving contractors, excavation crews, and truck fleets across Millstone and Somerset County.

About Us

WHY CHOOSE KS DIESEL IN Millstone, NJ?

We provide fast on-site diesel repair in Millstone with no towing, no delays, just expert service where you need it.

100% ON-SITE REPAIRS

All work is done at your job site, roadside, or fleet yard in Millstone. No towing. No shop delays.

1-YEAR WARRANTY

Every repair is backed by a 1-year workmanship guarantee.

FULLY EQUIPPED SERVICE TRUCKS

We bring all tools, parts, and diagnostic gear directly to you.

DIESEL & EQUIPMENT SPECIALISTS

We repair trucks, trailers, reefers, and heavy equipment on-site.

ASE-CERTIFIED TECHNICIANS

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

Our Services

Our Mobile Diesel & Equipment Repair Services in Millstone, NJ

Every repair is done on-site, minimizing your downtime. Here’s what we handle:

Heavy Equipment Repair

From excavators and skid steers to loaders and backhoes, we handle complete diagnostics and repair for all heavy equipment. We’re ready to roll to any job site in Millstone, whether you're near Carrs Tavern Road or working a large project off Millstone Road.

Mobile Truck Repair

We provide on-site repair for diesel trucks, box trucks, dump trucks, and semi-trucks. No need for towing. From electrical repair to engine issues, we fix your truck where it’s parked, even on the side of the road.

Roadside Assistance

Broken down near the Millstone River? Stuck off Stillhouse Road? Call us for emergency roadside diesel repair. We fix air leaks, lockouts, AC issues, dead batteries, and more.

Line Boring

We bring precision line boring services to your equipment, restoring pin bores and worn housings directly on-site.

Welding & Fabrication

Need field welding on a cracked boom or trailer? We perform structural welding, frame repairs, and custom fabrication, all mobile.

Hydraulic Hose Repair

We build and replace hydraulic hoses on-site for loaders, backhoes, and construction machines. Fast response when you're down in the dirt.

Diagnostics & Electrical Repair

Using OEM-level diagnostic tools, we identify issues quickly across trucks, trailers, reefers, and construction equipment.

PM Service (Preventative Maintenance)

Keep your machines running smoothly with scheduled PM service for your fleet, trucks, and equipment.

Fleet Maintenance

We offer ongoing fleet service for businesses in Millstone. Prevent breakdowns, reduce downtime, and stay compliant.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in Millstone, NJ

Breakdowns don’t wait. Neither do we. If you’re stuck at Route 33, down near Roosevelt Ave, or broken down mid-haul near the Manalapan Brook, we respond fast, 24/7.

Engine won’t start
Hydraulic line bursts
Reefer unit not cooling
Brake chamber failures
Locked-out vehicles
Lockout or jump start
Overheating issues
Air system leaks

We come to you, fix it on-site, and get you moving, no towing required.

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!!!!!!