BEARING AS-ROLLER 7Y0912 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure to determine if the service brake pedal position (switch 1) is preventing normal operation of cruise control, idle set speed, or PTO operation:The following switch circuits can also prevent the correct operation of the cruise control, idle set speed or PTO operation:
Service brake pedal position (switch 1)
Service brake pedal position (switch 2)
Neutral switch
Cruise control set/resume switch
Cruise control on/off switch
PTO on/off switchThe switches are described in the respective circuit tests in Troubleshooting.All of the following customer programmable parameters can affect cruise control, idle set speed, and PTO operation:
"Low Cruise Control Speed Set Limit"
"High Cruise Control Speed Set Limit"
"Idle Vehicle Speed Limit"
"Cruise/Idle/PTO Switch Configuration"
"Idle/PTO Bump rpm"
"Idle/PTO rpm Ramp Rate"
"PTO Vehicle Speed Limit"The vehicle speed calibration can also affect the cruise control, the idle set speed, and the PTO if the vehicle speed calibration is incorrectly programmed. Refer to Troubleshooting, "Customer Specified Parameters".Service Brake Pedal Position (Switch 1)The switch for the service brake pedal position (switch 1) is normally closed when the respective pedal is released. Depressing the brake pedal should open the individual circuit. This switch is OEM supplied. The service brake pedal position (switch 1) is typically a pressure switch.Kickout SwitchesThe switches for the service brake pedal position, the neutral switch, and the clutch switch are used in the cruise control mode, the PTO mode and the idle mode in order to discontinue the cruise operation, the PTO operation, or the idle operation. The capability to override the idle shutdown timer is determined by the "Allow Idle Shutdown Override" parameter setting. The "Allow Idle Shutdown Override" is a customer parameter.Usage of Transmission Style Switches The "Transmission Style" parameter determines the switches that will be used. The following switches can be used with being dependent on the parameter setting:
Clutch pedal position
Neutral
Service brake pedal position (switch 1)
Service brake pedal position (switch 2)Refer to Table 1 for additional information.
Table 1
Setting For Transmission Style Parameter Necessary Switches
Service Brake (Switch 1) Service Brake (Switch 2) Clutch Neutral
Manual X X
Automatic Option 1 X
Automatic Option 2 X X
Automatic Option 3 X X X
Automatic Option 4 X X
Eaton Top 2 X X A service brake pedal position (switch 1) is required for all configurations. The service brake pedal position (switch 1) connects to the Engine Control Module (ECM) through terminal P1-45 at the ECM connector. The service brake pedal position (switch 2) connects to the ECM through terminal P1-64 at the ECM connector. The clutch pedal position switch connects to the ECM through terminal P1-22 at the ECM connector. The neutral switch connects to the ECM through terminal P1-62 at the ECM connector.
Illustration 1 g00643881
Schematic for cruise control switch, service brake pedal position (switch 1) and clutch pedal position switch
Test Step 1. Check the Status for the Service Brake Pedal Position (Switch 1)
Connect Caterpillar Electronic Technician (ET) to the data link connector.
Turn the keyswitch to the ON position.
Access