Mack Truck
Repair Services
From Anthem highway tractors to Granite dump trucks, CTR Repair delivers dealer-level Mack diagnostics at independent shop pricing. MP7, MP8, mDRIVE — we know Mack inside and out.
Every Mack Model
Mack Anthem
Flagship highway tractor. Day cab, 48" and 70" sleeper variants with MP8 or MP7 power.
Mack Pinnacle
Workhorse predecessor still running millions of miles. Full drivetrain, electrical, and chassis service.
Mack Granite
Dump trucks, mixers, roll-offs, heavy-haul. Suspensions, PTOs, hydraulics, and body-chassis interface.
Mack TerraPro
Cabover for refuse, concrete, and front-discharge mixer. Low-entry cab maintenance, Cummins and Mack power options, Allison transmission service.
Mack LR / LR Electric
Modern refuse chassis including CNG variants. Full chassis and drivetrain service.
Mack MD6 / MD7
Medium-duty Cummins B6.7 powered with Allison transmissions. Box trucks, flatbeds, service bodies.
MP7, MP8 & mDRIVE
Mack MP8 (13-Liter)
415–505 HP
Volvo D13-based platform diagnostics and repair, wave piston technology and injector service, turbo compound power unit, EGR cooler and valve replacement, DPF regeneration and DOC/SCR aftertreatment repair, VGT turbocharger rebuild and replacement.
Mack MP7 (11-Liter)
325–425 HP
Volvo D11-based platform — full service, common rail fuel system and injector replacement, overhead adjustments, compression brake (Mack PowerLeash) adjustment and repair, coolant leak diagnosis.
Cummins B6.7 (MD Series)
200–325 HP
Medium-duty power for MD6/MD7. Full fuel system, turbo, and aftertreatment service.
mDRIVE Transmission Service
Mack Problems We Fix
Aftertreatment / Emissions System Failures
DEF quality sensor faults, SCR efficiency codes, DPF soot loading. Common codes: SPN 4094, SPN 3226, SPN 5246, P20EE.
EGR Cooler Leaks
MP7 and MP8 prone to EGR cooler cracking, especially in high-idle vocational applications.
VGT Turbo Actuator Problems
Variable geometry turbo sticking, causing low-boost codes and reduced power.
mDRIVE Clutch Wear & Shift Complaints
Hard shifts, gear-hunting on hills, premature clutch wear in vocational duty cycles.
Coolant Leaks
Water pump weep holes, thermostat housing cracks, EGR cooler failures, charge air cooler leaks.
Electrical / Multiplexing Issues
EPDM and body-builder interface wiring problems. Phantom warning lights, CAN bus faults.
Air System & Brake Issues
Governor leaks, air dryer failures, brake chamber problems. Bendix ABS/ATC service.
A/C System Failures
Blend door actuator failures, compressor clutch issues, evaporator leaks.
Comprehensive Service Menu
Preventive Maintenance
Mack ASIST-compliant PM programs, DOT annual inspections, pre-trip / post-trip issue resolution.
Engine Repair & Overhaul
In-frame and out-of-frame MP7/MP8 overhauls, injector replacement, head gasket and cylinder liner repair, engine brake adjustment.
Transmission Service
mDRIVE clutch replacement and calibration, Fuller manual transmission rebuild, Allison automatic service, PTO installation and repair.
Electrical & Diagnostics
Mack Premium Tech Tool (PTT) diagnostics, VMAC IV controller diagnostics, aftertreatment diagnosis, wiring repair and harness fabrication.
Steering & Suspension
Front axle and king pin, power steering, air-ride suspension, camelback and spring suspension, alignment — steer and tandem.
Brake Service
Foundation brake reline, Bendix ABS diagnosis, air system leak-down testing, automatic slack adjuster replacement.
Cooling System
Radiator repair and replacement, water pump, charge air cooler, fan clutch, coolant flush.
Hydraulic Systems (Vocational)
Dump body hydraulic cylinder and pump repair, refuse packer hydraulic service, mixer drum drive and charge maintenance, PTO-driven hydraulic diagnostics.
Why Choose CTR for Mack
Mack Repair Near You
CTR Heavy Duty — Armentrout Dr
Serving the greater Charlotte metro area: