Unusual gearbox noise
Unusual gearbox noise
(OP)
I have a 85 ton hoist with dual gearboxes that have started making a semi-grinding noise on lowering and raising with little or no load. The gearboxes are over 50 years old, but the operation is very limited(say 200 hours per year)
The oil was just changed (possibly for the first time) using a 90 weight oil as recommended by the crane manufacturer. Any thoughts?
The oil was just changed (possibly for the first time) using a 90 weight oil as recommended by the crane manufacturer. Any thoughts?





RE: Unusual gearbox noise
you have to check the bearings...
RE: Unusual gearbox noise
RE: Unusual gearbox noise
- audio, with a stethiscope to try and identify area of concern
- drain and refill oil after a week to inspect it's metallic content. Make sure you have high EP content in replacement oil.
- visual inspection if you have port access. Earlier the better so you have that reference.
- compitence, don't injure/pollute the box unintentionally.
The beauty of older boxes is the opportunity for repair. Gearsets can be expensive but bearing housings and shafting can typically be reworked to restore boxes without replacement costs.
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
RE: Unusual gearbox noise
TygerDawg
RE: Unusual gearbox noise
RE: Unusual gearbox noise
Are the bearings oil lubed, or greased?
If oil, how is the oil supplied to the bearings? Is it splash lube?