Gearbox Housing Bearing Bore Rebuild
Spun, worn-oversize gearbox bearing bore rebuilt cold and reformed back to dimension without machining a new housing.
A job completed with Belzona. This describes what the Belzona system does and how it goes on, not a record of a specific project by this distributor.
The challenge
A gearbox bearing bore spun in service and wore oversize, so the bearing outer race no longer seated tight in the housing. Once the bore opens up, the bearing creeps and turns in the bore instead of holding fast, and that wears more metal away while the shaft runs out of alignment. Left that way, the gearbox runs hot, loses the bearing, and risks taking the shaft and gears with it. The plant needed the bore back to the correct dimension, but the cast housing was not something they could quickly replace and there was no spare on the shelf.
The Belzona approach
The housing comes into the shop and the bore is cleaned back to sound metal so the full extent of the wear shows. Belzona 1000 Series composites rebuild the worn bore cold, building up enough material to take the bearing again. A release agent then goes on a mandrel sized to the bearing and the composite is formed against it, so the bore is reformed back to the correct dimension as it cures. Working cold means the cast housing sees no heat and no distortion, and no machine has to be set up to bore a new seat.
- Assess and measureThe spun bore is inspected and measured for how far it has worn oversize, confirming the bearing dimension the bore has to return to.
- Surface preparationThe worn bore is cleaned back to sound metal and the surface roughened so the composite bonds to the housing.
- Cold rebuild the boreBelzona 1000 Series composites build the worn bore back up, working cold so the cast housing sees no heat or distortion.
- Reform to dimensionA release agent goes on a mandrel sized to the bearing and the composite is formed against it so the bore cures back to the correct dimension.
- Cure and return to serviceThe cured bore is confirmed on size, and the gearbox goes back so the bearing seats and the shaft runs in alignment.
The result
- Bearing bore reformed back to the correct dimension without machining a new seat
- Spun, oversize bore rebuilt cold with no heat or distortion to the cast housing
- Original gearbox housing saved rather than replaced, with no spare casting needed
- Repair completed by factory-trained and factory-certified Belzona applicators
In the field
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Seeing something like this?
Belzona Houston is the authorized Belzona distributor for South Texas and the Gulf, based in Alvin, Texas, we’ll survey your equipment and recommend the right cold-applied Belzona system, with 24-hour support.