Truck Gearbox Builder

Mayfair Gearbox; Johannesburg; On-site; ZAR 300,000 - 450,000; Full time

Job summary

Mayfair Gearbox in Johannesburg is looking for a skilled Truck Gearbox Builder / Rebuilder. This role involves stripping, diagnosing, rebuilding, and assembling heavy-duty truck gearboxes to uphold quality standards.

The ideal candidate will have a minimum of 5-10 years’ experience in the field, a strong grasp of gearbox components, and the ability to deliver reliable workmanship.

Health and safety compliance is mandatory, and experience with Allisson, ZF, and Isuzu gearboxes is preferred.

Qualifications

• Minimum 5–10 years experience as a truck gearbox builder/rebuilder.
• Proven experience working on heavy-duty commercial gearboxes.
• Strong understanding of gearbox components and rebuilding procedures.
• Valid driver’s license is an advantage.

Responsibilities

• Stripping and diagnosing heavy-duty truck gearboxes.
• Rebuilding and assembling gearboxes according to standards.
• Conducting final inspections and functional testing.
• Maintaining cleanliness and organisation of the work area.

Skills

Heavy-duty truck gearbox stripping and rebuilding

Attention to detail

Technical ability

Inspection of components

Education

Matric / Grade 12

Tools

Torque wrenches

Presses

Dial gauges

Job description

Overview

Job Title: Truck Gearbox Builder / Rebuilder (Commercial)

Job Purpose

The Truck Gearbox Builder will be responsible for stripping, diagnosing, rebuilding, and assembling heavy-duty truck gearboxes to Mayfair Gearbox quality standards. The role requires strong technical ability, attention to detail, and the ability to work efficiently to meet turnaround times while ensuring reliable workmanship and minimal comebacks.

Key Responsibilities

• Gearbox Stripping & Fault Finding
  • Identify faults, worn components, and internal damage.
  • Inspect gears, bearings, shafts, synchros, selector forks, housings, and related components.
  • Provide accurate feedback to the foreman/service advisor for quoting purposes.
• Gearbox Rebuilding & Assembly
  • Rebuild and assemble truck gearboxes according to Mayfair Gearbox standards and OEM specifications.
  • Replace worn components including bearings, seals, gaskets, synchros, gears, and shafts where required.
  • Ensure correct setting of tolerances such as end float, preload, and backlash where applicable.
  • Use correct torque specifications and assembly procedures.
• Range/Splitter and Air System Work
  • Diagnose and repair range change and splitter systems.
  • Inspect and repair gearbox air systems, actuators, valves, and related components.
  • Ensure correct functionality of pneumatic components during assembly and testing.
• Quality Control & Testing
  • Conduct final inspections before closing gearbox casings.
  • Perform functional testing to confirm smooth gear engagement and correct operation.
  • Ensure workmanship meets quality standards and prevents repeat failures (comebacks).
  • Report any additional faults discovered during rebuild to management.
• Workshop Support & General Duties
  • Maintain cleanliness and organisation of work area.
  • Ensure tools and special tools are used correctly and returned after use.
  • Assist with gearbox removals/refits when required.
  • Work closely with the foreman and technicians to ensure workshop efficiency.
• Health & Safety Compliance
  • Follow all health and safety policies and procedures.
  • Ensure safe use of workshop machinery, presses, lifting equipment, and tools.
  • Wear PPE at all times and maintain a safe working environment.

Minimum Requirements

• Matric / Grade 12 (preferred).
• Minimum 5–10 years experience as a truck gearbox builder/rebuilder (essential).
• Proven experience working on heavy-duty commercial gearboxes (manual and/or automated).
• Strong understanding of gearbox components, tolerances, and rebuilding procedures.
• Strong understanding of Allisson, ZF and Isuzu Gearbox
• Experience with range/splitter gearboxes and air shift systems (advantage).
• Valid driver’s license (advantage).

Technical Knowledge Required

• Heavy-duty truck gearbox stripping and rebuilding.
• Bearing replacement, seals, gaskets, and component inspection.
• Use of workshop tools including presses, pullers, torque wrenches, and dial gauges.
• Understanding of common gearbox failures and how to prevent them.
• Ability to interpret technical manuals and follow OEM rebuild standards.