ALTERNATOR 3739708 - Caterpillar

3739708 ALTERNATOR Caterpillar parts 300.9D, 301.4C

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Alternative (cross code) number:
CA3739708
373-9708
3739708

Weight: 3 pounds 1 kg.

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MINI HYD EXCAVATOR,

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Number on catalog scheme: 7

Caterpillar 3739708 Parts scheme ALTERNATOR

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Compatible equipment models: 3739708:

MINI HYD EXCAVATOR 300.9D 301.4C Caterpillar

Information:

Illustration 1 g00874841
PMPE Generator Wiring Diagram (CR1-C6) Diodes (CR7) Varistor (L1) Exciter Field (Stator) (L2) Exciter Armature (Rotor) (L3) Main Field (Rotor) (L4) Main Armature (Stator) (L5) Pilot Exciter Armature (PM) Permanent Magnet (RFA) Rotating Field Assembly (CT1) Optional Voltage Droop Transformer (T0, T1, T2, T3, T7, T8, T9) Generator Terminals
Table 1
TOOLS NEEDED
Part Number Tool Quantity
6V-7070 Digital Multimeter 1 Measure the resistance of the following windings: (L1), (L2), (L3), (L4) and (L5). The winding that is being tested must be disconnected from the other components before the resistance can be measured. Note: The winding temperature affects the resistance. When the winding temperature increases, the winding resistance increases. When the winding temperature decreases, the winding resistance decreases. Therefore, a correct measurement can be performed only when the winding is at room temperature.The following resistance measurements are approximations. If the measured value is not near the listed approximation, the winding is probably damaged. For a more precise resistance value, consult the Technical Marketing Information (TMI). Refer to the generator arrangement that is in question.The following armature windings have very little resistance: (L2), (L4) and (L5). The resistance of these windings will measure near 0 ohms. Use a milliohmmeter to measure the resistance of the armature windings.Exciter Armature (Rotor) (L2) - less than 0.1 ohmMain armature (Stator) (L4) - less than 0.1 ohmPilot Exciter Armature (L5) - less than 0.1 ohmUse a multimeter in order to measure the resistance of field windings (L1) and (L3) .Exciter Field (Stator) (L1) - approximately 3.0 ohms to 6.0 ohmsMain Field (Rotor) (L3) - approximately 0.75 ohms to 2.0 ohmsNote: There should be no continuity between any winding and ground. There should be no continuity between any winding and another winding.