ENGINE AR-COMPL 20R1793 - Caterpillar

Illustration 1. New parts in the governor and fuel injection pump group.If service work is done on the new control, there are two differences to remember that apply only to the drill rig application.
... The control must be pressurized to 105 kPa (15 psi) in order to check the static fuel setting. This can be done with air pressure and a suitable pressure regulating valve. Or, the fabricated test kit (FT1829) can be used.
Illustration 2. New linkage and parts in the governor group (internal view of governor lever where connected to the new control). The parts shown are different than for other applications of this new fuel ratio control.... Also, in the governor linkage, a special 7C8219 Lever Assembly is used. See Illustration 2. This lever assembly uses a 7C8220 Piston and has NO spring. These changes inside the governor cause the maximum fuel setting at startup and during low boost to be limited to the fuel ratio control setting. These changes also help engine starting in this application.A Service Manual Supplement will cover system operation, testing and adjusting, and disassembly and assembly of the control linkage. Individual parts of the new control assembly are not serviced.