0322879 JOHNSON RELIEF VALVE

Table 1
Application Minimum Maximum Default
Other 24 km/h (15 mph) 204 km/h (127 mph) 204 km/h (127 mph)
GM 40 km/h (25 mph) 121 km/h (75 mph) 40 km/h (25 mph) "High Cruise Control Speed Set Limit"
The "High Cruise Control Speed Set Limit" parameter defines the highest vehicle speed that will allow the cruise control to be set. If a driver attempts to set a vehicle speed higher than this limit, the high cruise control set limit will be the cruise set speed. If the "High Cruise Control Speed Set Limit" parameter is programmed to a value that is greater than the "Vehicle Speed Limit" parameter, the cruise control switches can be used to exceed the programmed vehicle speed limit.
Table 2
Application Minimum Maximum Default
Other 32 km/h (20 mph) 204 km/h (127 mph) 204 km/h (127 mph)
GM 48 km/h (30 mph) 121 km/h (75 mph) 121 km/h (75 mph) "Exhaust Brake Mode"
The "Exhaust Brake Mode" parameter determines the operation of the engine brake while the cruise control on/off switch is in the ON position, but the engine is not in cruise control. This feature does not determine, and the feature does not allow the operation of the engine brake while the engine is in cruise control. When the "Exhaust Brake Mode" is programmed to the coast mode, the engine brake is enabled only while the service brakes are being applied.When the Engine Control Module (ECM) is programmed to the latch mode, the engine brake stays enabled after the service brakes are released. A direct, immediate pressure on the brake pedal latches the engine brake in the ON position. The engine brake will remain in the ON position until the accelerator pedal is depressed.When the "Exhaust Brake Mode" is programmed to the manual mode, the engine brake operates independently of the cruise control status.The engine brake operates with the application and the release of the service brake in the coast mode.The engine brake turns on with the application of the service brakes in the latch mode. The engine brake stays on even when the service brakes are released.
Table 3
Alternative Default
Coast
Latch Manual "Auto Retarder In Cruise"
The "Auto Retarder In Cruise" parameter defines the vehicle speed in kilometers per hour (km/h) or miles per hour (mph) above the cruise set speed when the engine retarder will be activated. The engine retarder switch must be in the ON position and the cruise control must be set for this feature to operate. This parameter affects the engine while the cruise control is activated.Programming the "Auto Retarder In Cruise" parameter to "0" disables this feature.If soft cruise control is programmed to "Yes", the retarder will not come on until the vehicle speed is at least 8 km/h (5 mph) above the cruise set speed.Note: Some transmissions will down shift when the engine retarder engages. The Caterpillar recommended setting for the "Auto Retarder in Cruise" parameter is 8 km/h (5 mph) in order to reduce the constant down shifting.The "Auto Retarder In Cruise" will turn off once the vehicle speed has been reduced by 3 km/h (2 mph).
Table 4
"Soft Cruise" NO
Minimum Maximum Default
5 km/h (3 mph) 16 km/h (10 mph) 0 km/h (0 mph) "Cruise/Idle/PTO Switch Configuration"
"Cruise/Idle/PTO Switch Configuration" defines the function of the set/resume switch for "Accel" mode and "Decel" mode. This parameter affects cruise control mode, idle mode and PTO mode.
Table 5
Alternative Default
Set/Decel-Res/Accel Set/Accel-Res/Decel "Soft Cruise Control"
"Soft Cruise Control" provides an 8 km/h (5 mph) operating range around the cruise control set speed in order to provide a smoother cruise control. "Soft Cruise Control" controls the cruise speed within the following range:
4 km/h (2.5 mph) below the set vehicle speed at full load
4 km/h (2.5 mph) above the set vehicle speed at no load
Illustration 1 g00670797
Soft Cruise control and soft vehicle speed limit
Table 6
Application Alternative Default
GM 530/540 Yes No
GMT-560
Other No Yes