Lead Diesel Mechanic - CAT/Peterbilt Fleet Mastery

Trillium Staffing; Menomonee Falls (WI); On-site; USD 44,000 - 61,000; Full time

Job summary

Trillium Staffing is seeking an experienced Head Diesel Mechanic to lead and manage our shop operations in Menomonee Falls, WI. This leadership role oversees a fleet of 8 Peterbilt trucks with CAT engines and 29 trailers, ensuring uptime for time-sensitive catering logistics.

You will drive maintenance schedules, supervise technicians, and enforce DOT compliance while maintaining a safe, organized shop floor.

Qualifications

• 5+ years of hands-on heavy-duty diesel technician experience with CAT engines and Peterbilt chassis.
• Prior shop lead or head mechanic experience preferred.
• Valid driver’s license; Class A CDL preferred; ASE or CAT certifications a plus.

Responsibilities

• Lead day-to-day shop operations, schedule maintenance, and track work orders.
• Perform diagnostic, repair, and overhaul work on Peterbilt trucks with CAT engines.
• Inspect and service 29 trailers, including air brakes, lighting, hydraulics, and structural components.
• Design preventive maintenance schedules to prevent downtime during peak periods.
• Use CAT ET software and diagnostic tools to identify faults and resolve issues.
• Ensure DOT safety compliance and maintain a clean, safe shop floor.
• Record labor time, parts usage, and service history for the fleet.

Skills

Heavy-duty diesel experience

Peterbilt chassis

CAT diagnostic tools

Leadership experience

Electrical diagnostics

Tools

CAT ET software

Diesel diagnostic tools

Job description

Trillium Staffing is seeking an experienced Head Diesel Mechanic to lead and manage our shop operations in Menomonee Falls, WI. This leadership role oversees a fleet of 8 Peterbilt trucks with CAT engines and 29 trailers, ensuring uptime for time-sensitive catering logistics.

You will drive maintenance schedules, supervise technicians, and enforce DOT compliance while maintaining a safe, organized shop floor.