Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Siga 4R-85G-AP Spindle Repair
This Siga 4R-85G-AP spindle is grease lubricated, belt driven, and capable of running up to 2,500 rpm.
The bearings in this Siga 4R-85G-AP spindle felt very rough when rotated by hand in assembly incoming. All external assembly screws were loose incoming. After disassembly and evaluation, we noted that the rear roller bearing was missing all of its rolling elements and the races showed evidence of a catastrophic failure. The front roller and thrust bearings were heavily contaminated with particulate and had evidence of excessive heat. No significant dimensional deviations were noted (tooling ID pilot, bearing journal/shoulders, housing bores).
The following actions were performed on this Siga 4R-85G-AP spindle:
- Clean, inspect overall dimensions
- Replace all bearings, o-rings, and assembly screws
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
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