Mobile Diesel & Heavy Equipment Repair in Watchung, NJ

Looking for a diesel mechanic in Watchung, NJ who comes to you fast, anytime, and anywhere? KS Diesel On-Site Repair provides 24/7 mobile diesel repair, truck repair, and heavy equipment service right here in Watchung.

Whether you’re broken down on Route 22, need emergency work at a construction site off Valley Road, or want same-day repairs at your fleet yard near Watchung Square Mall, we’ve got you covered fast.

About Us

WHY CHOOSE KS DIESEL IN Watchung, NJ?

We deliver expert mobile diesel repair, fully on-site, for Bernardsville’s contractors, fleets, and municipal operators. No towing, no delays, just fast, certified repairs where you need them.

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 RESPONSE

Call us any time, day or night. We show up fast across Watchung to get you moving again.

1-YEAR WARRANTY

Every repair comes with a 1-year workmanship guarantee. No questions, no shortcuts.

FAST DIAGNOSTICS

We find the problem fast and fix it on-site. No guessing, no wasted time.

ASE-CERTIFIED TECHNICIANS

Experienced, qualified diesel mechanics ready to respond.

Our Services

Our Mobile Diesel & Equipment Repair Services in Watchung, NJ

We serve contractors, owner-operators, fleet managers, and municipal crews in Watchung with full-spectrum on-site repair services. Below is what we offer, all delivered right to your jobsite or roadside location.

Heavy Equipment Repair

We fix excavators, backhoes, skid steers, dozers, loaders, forklifts, and more on-site. Whether it’s a busted hydraulic hose, bad starter, or wiring issue, we troubleshoot and fix heavy machinery right in the field.

Mobile Truck Repair

Semi-trucks, box trucks, and reefers, we repair them all roadside or in your lot. From brake failures to electrical faults or air leaks, our mobile diesel mechanics bring tools and know-how to you.

Roadside Assistance

Breakdown on Route 22 or Plainfield Ave? Whether your truck won’t crank, is blowing white smoke, or has no boost, we bring mobile diesel diagnostics and on-the-spot fixes to Watchung’s roads and ramps.

Line Boring

We offer precision in-place line boring to fix worn bore holes in loaders, backhoes, and buckets, all without removing the component from your machine. Save time. Avoid transport. Stay working.

Welding & Fabrication

Heavy-duty welding for cracked buckets, broken mounts, and structural issues. On-site fabrication to get your rig or equipment back in service without a shop visit.

Hydraulic Hose Repair

Blown hoses kill jobsite productivity. We carry high-pressure replacements and can rebuild hydraulic lines roadside or on the job. Fast fixes for excavators, dump trucks, skid steers, and more.

Diagnostics & Electrical Repair

We run full ECM scans and troubleshooting for Cummins, CAT, Detroit, Paccar, and more. Check engine light? Loss of power? We'll pinpoint the issue and fix it without towing.

PM Service (Preventative Maintenance)

Keep your diesel trucks and machines running strong. We offer on-site PM services, including fluid changes, filters, brake checks, and multi-point inspections, all without disrupting your crew.

Fleet Maintenance

Got multiple units or run a local fleet? We provide scheduled on-site fleet service for contractors, delivery services, and municipal vehicles in Watchung.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in Watchung, NJ

Equipment failure or truck down after hours? KS Diesel is your go-to emergency diesel mechanic in Watchung.

Whether you’re:

We dispatch immediately, day or night.

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!!!!!!