Slip Ring Replacement
- Remove rotor plastic grease retainer. Unwind field coil leads from slip ring lugs.CAUTION: Do not break wire leads.
Chisel through copper of both slip rings at opposite points (180° apart). Break plastic insulator and remove old slip ring. Scrape ends of coil wires for good electrical contact and position wires to clear path for new slip ring.
- Position new slip ring on rotor shaft with lugs in proper position for connecting field coil wires. Place suitable tool (C-3900) over rotor shaft and position rotor, slip ring and tool in arbor press. Press ring on shaft.CAUTION: When ring bottoms on rotor fan, field lead wire should clear access hole, fan and pole piece.
Tin field coil lead wires. Coil each wire around slip ring lug and solder with resin core solder.
- Test slip rings for ground with 110 volt test lamp by touching one probe to rotor pole piece and other probe to slip ring. Lamp should not light. Test for continuity by placing one test probe on each slip ring, lamp should light. If rotor is not grounded and field circuit is continuous, clean slip ring surface with a 00 sandpaper. Press grease retainer on rotor shaft using suitable tool (C-3921). Retainer will be properly positioned when tool bottoms on rotor shaft.