Truck & engine service
Cummins Engine Diagnostics & Repair
Mondak works on Cummins-powered commercial trucks and equipment by testing the engine and aftertreatment systems together—not treating every warning light as a parts order.
Equipment
- Class 5–8 trucks
- Vocational trucks
- Construction and support equipment
Systems
- Fuel and air management
- Cooling and lubrication
- Sensors, wiring and controls
- DPF, DEF and SCR aftertreatment
Reasons to call
- Low power or derate
- Hard start or no-start
- Coolant or oil concerns
- Repeated regen or emissions faults
Independent service, clearly stated.
Service familiarity only; Mondak does not claim Cummins dealer or factory authorization.
Related work
Go straight to the relevant repair.
GLENDIVE, MONTANA
Tell us what’s down.
Share the unit, location and symptoms. We’ll help determine the practical next step.