Zollern free fall winch overhaul

Alatas ServiceWorkshop Repairs
LocationSingapore
Crane ManufacturerLiebherr
Crane ModelHS885
Winch ManufacturerZollern
Winch ModelFree Fall Winch

A customer called on the Singapore Workshop for this Zollern free fall winch overhaul. Our Workshop was handed a Zollern free fall hoisting winch, together with hydraulic motor and new spare winch drum.

For the job, the customer required an inspection of the winch gearbox and overhaul it if necessary. We would then reassemble the whole unit with the new spare winch drum and complete the project hydraulic motor and function test. 

Inspection before Zollern Free Fall winch overhaul

The dismantling of main hoisting winch gearbox and parts conducted with NDT testing as was the 1st and 2nd stage planetary gear carrier.

All planetary gears, gear raceways and pin assemblies were examined by NDT testing and no defects found.

The inner gear ring unit was examined and found to have no major damages and all bearing seating faces and operational gears had no defects discovered.

All planetary gear bearings were found in an acceptable condition so were can be cleaned and re-used. 

The following units were also found in satisfactory condition:

Brake discs
Brake piston
Brake housing
Brake spring

Inspection

Dismantling of Zollern Free Fall Winch

Reassembling of Zollern winch

Testing and transportation

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