ALTERNATOR GP-CHARGING 5Y1528 - Caterpillar

Illustration 1 g00660107
(1) Dual horsepower setscrew assembly
Remove the dual horsepower setscrew assembly (1). The dual horsepower setscrew assembly consists of the cover, a setscrew, a nut, and a setscrew plug.Note: If the governor is disassembled past this point, the governor may need to be reset.
Manually push in the old piston assembly in order to activate the low horsepower setting.Note: Push in the piston assembly until the piston bottoms out in order to engage the Low Horsepower setting.
Adjust the calibration bench to the "LOAD STOP ADJ" rpm that is specified in the TMI. Slowly move the throttle to the "LOW IDLE ADJ" position and back to the "THROT STOP ADJ" position. Do not move the throttle again during this checking procedure.
Check the governor output dimension. The governor output dimension should be within the "DUAL POWER STOP ADJ" dimension.
Reinstall dual horsepower setscrew assembly (1) .Note: The governor is operating correctly and the governor can be used again without any adjustment if the performance of the governor is acceptable according to the tolerance checks.Note: If the governor fails any of the High Horsepower tests, proceed to the Testing and Adjusting, "Governor (Type V) - Adjust" section in this manual.Note: If the governor fails only the Low Horsepower test, proceed to the Testing and Adjusting, "Governor (Type VII) - Adjust" section of this manual.