CYLINDER BLOCK GP 2407271 - Caterpillar

SR4B generator can operate in high humidity conditions without problems. However, problems can occur when the generator is idle and the surrounding air is warmer than the generator. Moisture can form on the windings that will result in poor performance from the windings. Moisture can also result in damage to the windings. Whenever the generator is not active, ensure that the space heaters are in operation.
Table 1
Tools Needed
Part Number Part Quantity
237-5130 Multimeter 1
Stop the generator set.
Remove the panels in order to allow access to the regulator and control terminal strips. Locate terminal strip "TS1".
For 240 V systems, use the multimeter to measure the voltage between terminal "H1" and terminal "H4". If voltage is not present, disconnect the power source to terminal "H1" and terminal "H4", and check for 3 to 12 ohms resistance. If there is no resistance, check the generator service manual for further information. For 120 V systems, use the multimeter to measure the voltage between terminal "H1" and terminal "H2". If voltage is not present, disconnect the power source to terminal "H1", terminal "H2", terminal "H3", and terminal "H4". Check for 3 to 12 ohms resistance. If there is no resistance, check the generator service manual for further information.