HUB 3P0317 - Caterpillar

If there is a failure of the generator windings the generator can be rewound. A correct rewind job will return stator and rotor to like new condition. Four items are very important when rewinding any Caterpillar Generator.Wire
The correct AWG size and number wire must be used. This can be found in the rewind data. The type of wire must be that called for by NEMA standard MW1000 section MW24C. Use of wire other than that called for by this NEMA standard may cause a failure of the generator.Varnish
The varnish must have a class F rating. A high strengh 100 percent fill epoxy varnish is recommended. This is the best type material to use.Balance
Rotors that have been rewound and varnished must be dynamically balanced. Balance the rotor to a displacement of no more than 1/2 mil peak to peak. Vibration caused by a rotor that is not correctly balanced can damage the generator.Resistance
Resistance measurements will be accurate only if made with instruments able to measure very low resistance. A Wheatstone or Kelvin bridge is recommended. Do not use an ohmmeter.Resistance values are correct only at the given temperature. If the temperature of the windings is different than that given, use the formula that follows to find the actual resistance. 7L10, 7L69, 8L50 and 8L78 Generators 7L11, 7L43*, 7L70, 7L84, 8L19, 8L51, 8L69 and 8L87 Generators 7L13 Generators 7L14 Generator 7L16 Generator 7L17, 7L44* and 7L72 Generators 7L19, 7L61*, 7L79, 8L22, 8L53, 8L70 and 8L88 Generators 7L21, 7L60, 7L81, 7L99, 8L23, 8L55 and 8L64 Generators 7L23, 7L64 and 7L83 Generators 7L25, 7L39, 7L67*, 7L68, 7L85, 7L87, 8L24, 8L59, 8L71 and 8L76 Generators 7L40, 7L77, 8L20, 8L28, 8L57 and 8L66 Generators 7L54, 8L41 and 8L80 Generators Rotor Winding Table 7L57, 8L35, 8L72 and 8L92 Generators Rotor Winding Table 8L11 Generator Rotor Winding Table 7L27, 7L36, 7L96, 8L44, 8L61 and 8L90 Generators Rotor Winding Table 7L28, 7L88, 8L30 and 8L81 Generators 7L30, 7L63, 7L90, 8L32, 8L62 and 8L93 Generators 7L33, 7L66, 7L93, 8L18, 8L38, 8L77 and 8L89 Generators Rotor Winding Table 7L51, 8L13, 8L17, 8L26, 8L47, 8L75 and 8L79 Generators Rotor Winding Table 8L91 Generators Rotor Winding Table 7L56 and 8L43 Generators Rotor Winding Table 7L59 and 8L37 Generators Rotor Winding Table 8L12 Generator Rotor Winding Table 7L32, 7L92, 8L34 and 8L74 Generators 7L35, 7L95 and 8L40 Generators Rotor Winding Table 7L38, 7L98, 8L46 and 8L82 Generators Rotor Winding Table 7L53, 8L15, 8L29, 8L49 and 8L68 Generators Rotor Winding Table 7L12, 7L71, 8L52 and 8L84 Generators 7L15 Generator 7L18 Generator 7L20, 7L80, 8L54 and 8L83 Generators 7L22, 7L82, 8L56 and 8L73 Generators 7L24 and 7L65 Generators 7L26, 7L62, 7L86, 8L16, 8L25, 8L60 and 8L67 Generators 7L41, 7L78, 8L21, 8L58 and 8L85 Generators 7L55, 8L27, 8L42 and 8L65 Generators Rotor Winding Table 7L58 and 8L36 Generators Rotor Winding Table 7L29, 7L89 and 8L31 Generators 7L31, 8L91, 8L33 and 8L63 Generators 7L34, 7L94, 8L39 and 8L86 Generators Rotor Winding Table 7L37, 7L97 and 8L45 Generators Rotor Winding Table 7L52, 8L14 and 8L48 Generators Rotor