Overhaul 80 railway gear units in the city of Houston/USA

In the course of implementing preventive maintenance measures at MetroRail Houston (Light Rail Vehicle), Eisenbeiss Industrial Gear Service was responsible for maintaining and renovating the wheel unit gear systems.

As a lead-up to the project, comprehensive measurements were made and resulting re-engineering planned for the relevant gear unit type. Defining and procuring the spare parts packages in advance made sure that the necessary components were available at the service centre in Sacramento. The parts involving gear teeth were manufactured at the Eisenbeiss plant in Enns / Austria. Designing special work rigs and tools as well as defining work processes in advance ensures smooth implementation of the maintenance work at our service centre in Sacramento.

Application: wheel unit gears for railway vehicles (Light Rail Vehicle)
Gear manufacturer: Voith
Type: SZH420
Gear type: 2-stage spur gear system
Data for repair: maintenance instruction available; no drawings provided
Damage: bearings and gear teeth worn

Work carried out:

  • Sample recording of a complete gear unit
  • Re-engineering and improved parts design
  • Create gear documentation including drawings and parts list
  • Purchase all necessary spare parts (manufacturer gear components at Eisenbeiss headquarters in Enns / Austria)
  • Design and manufacture installation tools
  • Define work processes for renovating gears
  • On-going gear unit renovation work in Sacramento

Turnaround time:

  • Total project time for 80 units 2 years
  • One set of 4 gear units is completely overhauled within 2 weeks
Getriebe Reparatur

Voith SZH420 wheel unit before and after overhaul

Getriebe Reparatur

Dismantling Voith SZH420 gear unit

Getriebe Reparatur

Test run with Voith SZH420 gear unit including vibration monitoring