Mobile Diesel & Heavy Equipment Repair in Bethlehem, NJ

Need a diesel mechanic in Bethlehem, NJ?
KS Diesel On-Site Repair comes to you with fast, 24/7 mobile truck, trailer, and heavy equipment repair.

Whether you’re on Route 78, County Road 513, or a local job site, we fix it on the spot.

About Us

WHY CHOOSE KS DIESEL IN Bethlehem, NJ?

Get expert diesel repair in Bethlehem with zero shop delays. We bring the repair shop to you, fast and fully equipped.

100% ON-SITE REPAIRS

All repairs are done at your job site, roadside, or fleet yard. No towing. No downtime.

24/7 EMERGENCY SERVICE

Call anytime. We respond fast and work around your schedule.

1-YEAR WORKMANSHIP WARRANTY

Every job is backed by a full one-year guarantee.

HEAVY EQUIPMENT & TRUCK SPECIALISTS

We fix backhoes, loaders, trailers, and diesel trucks directly at your location.

ASE-CERTIFIED TECHNICIANS

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

Our Services

Our Mobile Diesel & Equipment Repair Services in Bethlehem, NJ

At KS Diesel On-Site Repair, we don’t just fix trucks, we solve diesel problems on the spot, whether it’s a semi-truck on Route 31 or a loader on a Bethlehem excavation site.

Heavy Equipment Repair

Backhoes, skid steers, excavators, dozers, we repair them all. Construction downtime in Bethlehem is costly. We keep your heavy equipment running without hauling it offsite.

Mobile Truck Repair

From semi trucks and box trucks to reefers and service vehicles, we perform full-service repairs for diesel trucks throughout Bethlehem, including in-cab electronics, brakes, air leaks, and AC systems.

Roadside Assistance

Stuck on Pittstown Road or just outside Charlestown Road? Call us for mobile truck repair near Bethlehem. We'll be there fast with tools in hand.

Line Boring

We offer on-site line boring for heavy equipment, a service not every mobile mechanic can provide. Perfect for worn-out pivot points and frames on excavators and loaders.

Welding & Fabrication

Frame repairs, trailer hitches, cracked loader buckets, our mobile welding rig handles it all.

Hydraulic Hose Repair

Blown hose? We carry a full inventory of hydraulic hose assemblies and fittings. We’ll crimp and install hoses right at your Bethlehem site.

Diagnostics & Electrical Repair

We use advanced diagnostic tools to troubleshoot check engine lights, electrical shorts, fault codes, AC issues, and more.

PM Service (Preventative Maintenance)

Oil changes, filter replacements, brake inspections, all done onsite. Keep your equipment in top shape without the downtime.

Fleet Maintenance

Own a local fleet in Bethlehem? We offer scheduled maintenance and emergency diesel repair for multiple units at once, great for trucking companies, rental services, and municipalities.

Breakdowns happen anytime, and we respond anytime

24/7 Emergency Diesel Repair in Bethlehem, NJ

Breakdowns don’t wait. Whether you’re stranded off Route 78 at night or stuck on a muddy job site during the day, KS Diesel is on call. We handle:

Just call, and we’ll dispatch a mobile diesel mechanic near Bethlehem immediately.

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 Bethlehem, NJ

Bethlehem is filled with working diesel equipment, from farms to fleets. We serve:

Construction crews on private sites and residential builds
Local trucking fleets traveling through or based near Bethlehem
Excavation contractors working farmland or development zones
Municipal Fleets – public works, fire equipment, utility trucks
Equipment rental companies with gear on-site in Bethlehem

Gallery

Our Recent Works

Mobile Diesel Repair Near you

Neighborhoods We Serve in Bethlehem, NJ

We serve every corner of Bethlehem, including:

Charlestown
Valley Station
Mountain View Road
Mine Road
Hollow Brook Road
Asbury-West Portal Road
Iron Bridge Road
Turkey Hill Road
Staats Road
Norton Church Road

Whether you’re near the Bethlehem Township Elementary School or deep in the agricultural zones near Charlestown Reserve, we’ll get there fast.

Mobile Diesel Repair in Bethlehem Township, NJ

Request a Free Estimate

Fill out the form below and our mobile diesel mechanic will contact you ASAP. We serve Bethlehem Township 24/7.