Anchor Winch Running Slow - Muir Jaguar 3500

[OSBNZ]

My anchor winch started running slow when under load. I have stripped it down and found gearbox bearings were in bad shape and replaced them. Inspected motor at the same time and brushes and commutator looked in good condition. Reassembled but still have speed of winch dropping when under load.

Question now is what is likely cause? Is it likely to be just a brush issue like one brush not contacting or is it possibly a failed winding issue in the motor? Either way I need to strip it down again. Currently cruising in Tonga so limited resources but I do have a spare set of brushes on board but no springs if it is a broken spring although this was not apparent when I originally stripped the winch

[GordMay]

Check for voltage drop, at motor terminals.