Mobile Heavy-Duty Truck & Trailer Repair
Mainely Big Rigs provides mobile diagnostics, air/brake repairs, electrical troubleshooting, tire service, PM work, and roadside repairs for trucks, trailers, fleets, and owner-operators across Central Maine.
Our Core Heavy-Duty Repair Services
Mainely Big Rigs offers comprehensive mobile repair solutions designed to keep your heavy-duty trucks and trailers operating efficiently. We specialize in on-site diagnostics, critical repairs, and preventative maintenance, ensuring your equipment is always ready for the road.
Mobile Diagnostics & Electrical
Expert mobile heavy-duty diagnostics and electrical/ABS troubleshooting to quickly identify and resolve complex issues. Crank but no start conditions, no-crank conditions, after treatment forced regens, SCR tests for DEF systems.
Wheel-end and Brake Service
Brakes, hubs, bearings, seals, drums, and wheel-end repairs handled with safety first.
Commercial tire service
On-site commercial tire service for trucks and trailers, keeping your wheels rolling safely.
Complete In-Frame & Out-of-Frame Engine Rebuilds
From diagnostics to complete engine overhauls, we repair heavy-duty diesel engines with quality workmanship built to maximize reliability, performance, and uptime. We fix it right so your truck gets back on the road with confidence.
R&R long block Paccar IS9 engine in a Peterbilt pedal oil truck (2025)
Allison & Eaton Fuller Transmission Service
From Allison automatic and Eaton Fuller manual transmissions to complete removal, installation, diagnostics, and replacement, we provide dependable heavy-duty transmission service built to maximize reliability, performance, and uptime.
Remove and replace Allison transmission in a 2009 VNL Volvo (Nov. 2025)
Remove and replace clutch pack, pilot bearing, through shaft bushings, tower gasket, isolator bushing, rear main seal, etc in a Peterbilt. (2019)
Drivetrain, Clutch & Differential Repair
Clutches, differentials, drivelines, and the heavy components that keep the power going to the road.
Commercial Trailer Repair & Maintenence
Why choose Mainely Big Rigs?
We’re the real McCoy. Throw a rock in the Greater Bangor market and you’ll probably hit a truck we’ve fixed, a trailer we’ve saved, a mixer we’ve worked on, a mine we’ve been in, or a weld that’s still holding. Mainely Big Rigs brings tried-and-true heavy-duty experience right to your truck — no fluff, no excuses, just rigs back on the road.
Experience and efficiency
We deliver mobile diagnostics, air brake repairs, everything from the Compressor to the air dryer cartridge, governor, purge valve, maxi cans, slack adjusters, brake shoes + drums, class 8 semi-truck disc brakes as well. To the electrical troubleshooting, Aftertreatment diagnostics and Forced regenerations as well SCR Conversion tests for DEF systems, cut-out tests. Steering components, drag links, etc.
Based near I-95 Exit 150, we focus on straight answers, honest communication, and getting your equipment moving again without the runaround
Less Downtime. Fewer Surprises. More Miles.
