ENGINE AR 2Y9488 - Caterpillar

Illustration 3 g00458231
(A) Work mode (B) Parameter setting (C) Display number (D) Flow mode (A) Work Mode 1 ... Work tool #1 2 ... Work tool #2 3 ... Work tool #3 4 ... Work tool #4 (B) Parameter Setting H ... Hours of working mode E ... Engine RPM setting F ... Pump flow (D) Flow mode L1 ... Low oil flow, one-way flow H1 ... High oil flow, one-way flow L2 ... Low oil flow, two-way flow H2 ... High oil flow, two-way flowThe display window for the auxiliary controller is identified above. These segments of the LED are referenced in the flow chart for the troubleshooting procedure.When the Hours of working mode (H) is selected, the hours will be displayed in the last four digital positions (C) and (D). When the Engine RPM (E) is selected, the engine speed setting is shown in digital display (C). When the Pump flow (F) is selected, the operating flow is shown in digital display (C). The reading is a percentage of maximum pump flow.The Systems Operation, Testing and Adjusting, RENR1020 must be used for a reference in order to supplement the investigation of suspect auxiliary hydraulic controllers for reusable parts.
Illustration 4 g00807132
Illustration 5 g00807171
Location of 142-7223 Solenoid Valve Gp (20)
Illustration 6 g00807174
Location of the pressure switch for "PAT" port (21)
Illustration 7 g00807134
Illustration 8 g00807135
Note: The dashed block contains symbols for the "Engine rate" and the "Flow" that represent the term "less than or equal to".
Illustration 9 g00807136
Illustration 10 g00807137
Illustration 11 g00807139
Illustration 12 g00807142
Illustration 13 g00807146
Illustration 14 g00807339
There are different ways for checking the wiring.
Verify the resistance of the engine speed dial. Each contact must be lower than 50 Ohms when the engine speed dial is in the ON position. Each contact must be greater than 5000 Ohms when the engine speed dial is in the OFF position.
Insert a shunt across the following connectors: A755-PK, A756-PU, A757-WH and A758-BR. the connectors are located under the platform.Note: See the electrical schematic in the Service Manual.
Insert a shunt directly across "Din" to "Dout".
A755-PK Pin 3 to K973-BR Pin 4 on the mating Auxiliary Control
A756-PU Pin 9 to K974-PU Pin 10 on the mating Auxiliary Control
A757-WH Pin 15 to K975-WH Pin 16 on the mating Auxiliary Control
A758-BR Pin 21 to K976-OR Pin 22 on the mating Auxiliary Control
Illustration 15 g00807340
Illustration 16 g00807148