Setco 4103BY Spindle Repair

The Setco 4103BY spindle is grease lubricated, belt driven, and capable of running up to 8,000 rpm.

CHALLENGE

This Setco 4103BY spindle was seized incoming.  No testing was able to be performed.  The rear nut galled and had to be machined off to complete the disassembly and evaluation.  We found that the front bearings were heavily rusted showing no signs of grease and the rear bearings were heavily contaminated with a brown sludge.  The front and rear housings were severely oversized F(+10/+30μ) R(+16/+30μ) and the front and rear bearing journals were undersized F(-2/-6μ) R(-3/-7μ).  No other dimensional deviations were noted for this repair.

SOLUTION

The following actions were performed on this Setco 4103BY spindle:

• Clean, inspect overall dimensions
• Replace bearings, o-rings, and assembly screws
• Manufacture new rear nut
• Replace front cork gasket
• Grind, chrome plate, and finish grind the front housing (80mm), rear housing (80mm), front bearing journal (50mm), and Rear bearing journal (40mm)

RESULT

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.