Mining Maintenance and Repair Contracting

Precision Mobile Line Boring & Infield Machining Services

OSHA, AWS and MSHA certified

Welding and machining repairs for steering, axle, and suspension systems

With decades of experience, J.R. Smith Welding Service, Inc. specializes in welding and machining repairs for steering, axle, and suspension systems on Euclid and Hitachi off-road mining haul trucks.

Our services include

Certifications in Welding services

Removing frozen king pins and set screws

Certifications in Welding services PA

Welding and line boring trailing arm–style axle and spindle king pin bores, including removal and replacement of all factory wear bushings

Certifications in Welding services PA

Hand weld build-up and refacing of thrust bearing faces on trailing arms and their opposing spindle bearing surfaces

Certifications in Welding services PA

Hand weld build-up and reboring of rear trailing arm bores in truck frames and rear axle housings, including re-machining snap ring grooves and installing factory spherical bearings

We perform these heavy-duty reconditioning repairs on anthracite and bituminous coal mining machinery year-round, even in harsh outdoor conditions, consistently delivering results that exceed customer expectations.

All completed work is warranted for durability, fit, and proper operation.

We proudly serve industries across Pennsylvania, New Jersey, New York, Delaware, and Maryland, with the ability to travel further when specialized, certified repair solutions are needed.

Friends of Coal, OSHA, AWS and MSHA certified

Why Trust J.R. Smith with Your Machining?

Infield machining requires a unique blend of surgical precision and industrial strength. Since 1986, we have specialized in performing these high-tolerance repairs in unpredictable field conditions. By utilizing advanced boring bar systems and custom-engineered mounting setups, we ensure your bores are perfectly concentric and your surfaces are perfectly flat.

Service Area & Availability

With coverage across the Mid-Atlantic, our mobile machining teams are available for both scheduled maintenance and emergency breakdown support. We follow OEM-approved repair procedures to ensure your equipment returns to service in peak operational condition.