When the pilot valve plunger is moved down, high pressure oil goes to the bottom of the power piston and the power piston will move up. The pilot valve plunger has a land that controls oil flow through the ports in the bushing. The rotation of the bushing helps reduce friction between the bushing and the plunger. Oil to or from the bottom of the power piston is controlled by the pilot valve. When oil pressure on the bottom of the piston is directed to the sump, the piston will move down and cause the output terminal shaft to turn in the decrease fuel direction. When the oil pressure is the same on the top and bottom of the piston, the piston will move up and cause the output terminal shaft to turn in the increase fuel direction. There is oil pressure on both the top and bottom of the power piston. The driven gear of the oil pump is also the drive for the ballhead.

The drive gear of the oil pump has a bushing in which the pilot valve plunger moves up and down. The governor oil pump and ballhead are driven from a shaft in the governor drive housing. When the position of the fulcrum is changed, the amount of movement possible of the actuating piston is changed.Ī lever on the terminal shaft is connected to the fuel rack by a linkage rod. To get started finding Cat D398 Diesel Engine Generator Manual, you are right to find our website which has a comprehensive collection of manuals listed. If there is a survey it only takes 5 minutes, try any survey which works for you.Īll Rights Reserved Caterpillar, Cummins, Detroit Diesel, and all other brand names and logos are trademarks of their respective companies.Īnd by having access to our ebooks online or by storing it on your computer, you have convenient answers with Cat D398 Diesel Engine Generator Manual. Our library is the biggest of these that have literally hundreds of thousands of different products represented.

Cat d399 engine specifications