Mechanical Maintenance Technician IV

Amentum; Illinois; On-site; USD 41,000 - 58,000; Full time

Job summary

Amentum is seeking an advanced Mechanical Maintenance Technician IV for our 2nd shift facility maintenance team in Mossville, Illinois. The role focuses on responding to work orders, troubleshooting, and preventive/corrective maintenance on mechanical equipment in an industrial manufacturing environment. The ideal candidate will diagnose, repair, and maintain conveyors, HVAC systems, pumps, and related machinery, while complying with safety standards and CMMS workflows.

3:30 p.m. to 11:30 p.m.

Qualifications

• Five years of mechanical maintenance experience in an industrial environment.
• Ability to operate in an aerial lift or scissor lift up to 30 feet or higher.
• Must pass a pre-employment substance abuse test.
• Valid Driver’s License and ability to obtain security access badge.
• Overtime, various shifts, weekends, holidays, and alternative schedules.

Responsibilities

• Diagnose, troubleshoot, and repair facility mechanical systems; pneumatics, hydraulics, conveyors, and overhead cranes.
• Troubleshoot ventilation equipment, pumps, fans, chillers, AHUs, compressors, and boilers.
• Perform welding and fabrication for fixtures, brackets, and maintenance parts.
• Operate CMMS for preventive maintenance scheduling and documentation.
• Work safely with 3-phase power up to 480V and perform basic electrical repairs.
• Assist in moving machines and equipment; maintain safety and quality standards.

Skills

Mechanical maintenance

Troubleshooting

Welding

Fabrication

Electrical troubleshooting

CMMS

Education

Associate’s degree or technical certification in industrial mechanical, HVAC, or related Facility Maintenance discipline

Tools

Welding equipment

HVAC field tools

Electrical diagnostic tools

Job description

Amentum is seeking an advanced Mechanical Maintenance Technician IV for our 2nd shift Facility Maintenance team in Mossville, Illinois

• Typical work schedule is 3:30p.m.to 11:30 pm; hours may vary based on business demand.

This Maintenance Mechanic is responsible for providing an advanced level of expertise in responding to work orders, troubleshooting, and providing preventive and corrective maintenance on the facility

mechanical equipment and systems in an industrial manufacturing environment.

Responsibilities:

• Diagnoses, troubleshoots, and repairs facility mechanical systems; pneumatic and/or hydraulic systems; conveyors; and overhead cranes.
• Diagnoses and troubleshoots ventilation equipment, pumps, fans, chillers, rooftop AHU's, split systems, compressors, refrigeration, boilers, etc.
• Troubleshoots and repairs HVAC equipment, blowers, and fans.
• Performs welding and fabrication, including building custom fixtures, fabricating brackets, and fabricating maintenance parts or "one off" parts.
• Performs maintenance on various welders as needed.
• Troubleshoots and repairs commercial doors, including those made by Rytek, DoorMan, Mega Door, DynaCo Doors, and similar manufacturers.
• Troubleshoots and repairs heat exchange equipment.
• Performs basic pipefitting repairs.
• Work safely with 3-phase power up to and including 480V.
• Troubleshoots and repairs basic electrical issues.
• Conducts preventive maintenance inspections and performs required preventive maintenance actions such as lubrication, cleaning, filter changes, etc.
• Assists in the movement of machines/fixtures, materials, and equipment as required.
• Performs preventive maintenance as scheduled in the Computerized Maintenance Management System (CMMS).
• Responds and provides service and feedback to the customer on all work orders while assuring compliance to codes, regulations, and industry standards.
• Analyzes and resolves work problems or assists workers in solving work problems.
• Safely performs functions of the position including following proper safety guidelines such as job hazard analysis and lockout/tagout procedures and wearing PPE as required.
• Operates various measuring, diagnostic and testing instruments to help provide energy efficiency solutions.
• Operates a variety of equipment such as hand tools, laptop computers and diagnostic hardware to perform work.

Physical /Special Requirements:

• Requires the ability to regularly lift to 50 lbs.
• Requires the ability to regularly climb extension ladders, roof ladder, stepladders, and stairs at least 10 times during shift.

• Requires the ability and flexibility to stretch/reach, bend/stoop, squat, kneel. move in a 90-degree fashion repetitive during shift.
• Requires the ability to walk extensively throughout the plant during shift.
• Requires the use of a Company/Client approved utility knife.
• Requires the ability to differentiate colors pertaining to wire color-coding.
• Some tasks will require repetitive wrist movement.
• Requires the ability to interact with all clients in a professional and friendly manner despite periods of stress.
• Wear steel toe safety shoes, safety glasses, gloves, hard hats, and other Personal Protective Equipment as needed.

Minimum Requirements:

• Five years of experience performing mechanical maintenance in an industrial environment or demonstrated equivalent combination of education and experience.
• Must have the ability to work in an aerial lift or scissor lift at heights up to 30 feet or higher.
• Must pass a pre-employment substance abuse test.
• This position may require a valid Driver’s License.
• This position does not include sponsorship for United States work authorization.
• This position will require the ability to obtain a security access badge at our client’s location.
• This position will require overtime, various shifts, weekends, holidays, and alternative work schedules.

Preferred Qualifications:

• Associate’s degree or technical certification in industrial mechanical, HVAC, or related Facility Maintenance discipline.
• Welding certification.
• Experience with building mechanical equipment operation, diagnostics, and repairs.
• Experience performing preventive maintenance on facility related equipment.
• Experience performing pipefitting, welding, fabrication, and millwright related work.
• Experience welding using MIG, TIG, and arc welders.
• Experience maintaining basic plumbing needs.
• Experience with basic electrical troubleshooting and repairs.
• Experience working in a CMMS environment.

Compensation Details:

35.00

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement benefits (including 401(k) matching)
• Educational reimbursement
• Parental leave
• Employee stock purchase plan
• Tax-saving options
• Disability and life insurance
• Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting:

08/05/2026 - Until Filled

Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.