1998/06/15 Caterpillar

784B (5RK) Tractors;
785B (6HK) 789B (7EK),
793B (1HL),
793C (4AR) Off-Highway Trucks

SUPPLEMENT: AUGUST 31, 1998

Service Magazine SEPD0421, Article 7, Page 4, June 15, 1998; "Improved VIMS Configurations Available For Certain Off-Highway Trucks".

The information in the "9.3x Former Part Numbers (Ref only)" column and the last two rows of Chart 1, Page 7 and Chart 2, Page 8 should be blank. A blank in these four cells means there are no "9.3x Former Part Numbers" for the associated "New Part Numbers".

--------------- END SUPPLEMENT ---------------

Reference: Service Magazine; SEPD0399; January 5, 1998; Page 17, "VIMS Version 9.5X On-Board Source Software Available."

Description of Change: This article summarizes the improvements and enhancements to VIMS 9.5X class of software configurations for certain Off-Highway Trucks. These configurations should only be used with the 151-1293 9.5X Class Source Code Software Group. Folllowing is a list of all software changes and charts to help determine the correct part number for both machine and application.

Adaptable To: Effective with 784B (5RK26) Tractors; 785B (6HK897), 789B (7EK679) and 793C (4AR364) Off-Highway Trucks equipped with the proper software configuration. Adaptable to earlier models with the proper software configuration and retrofits in place. Refer to exclusions and effectivity listed in the information above.

Software Changes Effective With 784B (5RK26) Tractors; 785B (6HK897), 789B (7EK679) And 793C (4AR364) Off-Highway Trucks

* Air filter restriction has been changed to read in Inches of Water instead of PSI.

* Actual gear parameters are once again available for analysis through the VIMS Off-Board PC Software Group. These parameters provide the transmission gear in a numerical format from -1 (Reverse) to 6 (6th Gear) rather than a text string.

* Engine over speed event strategy has been modified to filter out some nuisance events and snapshots. Engine over speed indicators will now trigger a snapshot at 2350 rpm after 5 seconds and at 2600 rpm immediately/.

* VIMS has been modified so all common events to VIMS and ADEM will have identical trigger conditions. This should avoid confusion when comparing engine diagnostics to a VIMS event list.

* Prognostic data has been made more accurate and parameters have been standardized between configurations.

* Events have been added to the engine shutdown algorithms which will indicate to the customer why the engine has shutdown. In the past, there has only bee a generic system event to indicate shutdown.

* SVSET keypad command has been added which will allow the customer access to a new service lamp functionality. Refer to the reference article for additional information.

* ERSET keypad command has been added which will allow the customer the ability to create a snapshot trigger for any one event. Refer to the reference article for additional information.

* ODO keypad command has been added which will allow the customer to change the odometer setting.

* A new event has been added which will indicate to the operator when the payload system is uncalibrated. The payload system will not function until the system is calibrated. Future software versions will allow payload calibrations to be retained when adding a new configuration. So a calibration will not be necessary when software is changed. Refer to VIMS Service Manual for calibration process.

* Machine pitch, machine rack, lockup clutch slip and transmission slip are again available to the customer. Machine pitch and machine rack are available Off-Board only.

* The 9.3X snapshot that was triggered from high torque converter temperature has been removed.

* Two new parameters have been added to calculate left and right front to rear delta brake temperatures.

* A trend was added to monitor maximum front after cooler temperature. This was added to all configurations which support the front after cooler.

* Some events in the 9.3 release such as differential level, after cooler level, jacket water level, etc., had dependencies for engine speed which were set incorrectly. This problem has been corrected.

* Two new events have been added to the monitor for left and right turbo inlet pressure. This is applicable to all models, except for 789B (7EK) which has only a single turbo inlet pressure sensor.

* Histograms were added to monitor left and right exhaust temperatures.

* An engine shutdown algorithm was added to the after cooler level parameter which is identical in operation to the jacket water level parameter. This is applicable to all models, except for 793B (1HL) which does not have a separate cooling circuit for the after cooler.

* Event strategy for brake temperatures has been modified so that a snapshot will be triggered after 30 seconds and a level 3 event will become active after 80 seconds.

* Activation delay for the logged parking brake event has been increased so that fewer parking brake events are logged.

* Event strategy for the body-up ground speed has been modified to allow the customer up to 27 seconds to lower the body after pullling away from the dump site. This is based on typical times required to lower the body and the amount of time required to reach the top first gear speed. One noticeable difference is the speed trip point for the start of the 27 second time is now 3.3 mph instead of 5 mph.

* New epsilon values have been added to the VIMS payload system in an attempt to decrease the amount of time it takes to get a payload value.

* A new linearization map has been added for all applications of the 100-3055 and 118-7226 Sensor Groups. This should help eliminate system events which incorrectly diagnose the sensor as shorted high when the sensor is reading temperatures near the top of its range.

* The diagnostic high limit point for the 3E-7826 exhaust temperature sensor has increased to help eliminate incorrect diagnostics indicating the sensor is shorted high. This change was made to all models except the 793C (4AR) since this truck reads exhaust tempature through the ADEM engine control and not VIMS.

* Common events and parameters among the different models were compared and where appropriate, the event and parameter definitions were standardized.

Changes Effecting 793C (4AR) Only

* Crankcase pressure has been changed to read in Inches of Water instead od PSI.

* A new parameter has been added which will monitor the cold mode status.

* A new parameter has been added which will monitor the percentage of engine derate.

* A new parameter has been added to monitor the user defined shutdown input to the ADEM-II control. This will communicate that the owner installed equipment has shutdown the engine through the ADEM-II control (i.e. fire suppression system).

* Parking brake filter has been installed on 793C (4AR) trucks since first production, but it has not been monitored. A parameter has been added to the configuration along with an event which will indicate when the filter is by-passing oil.

Configuration Charts

The charts below should only be used to select the correct configurations for specific trucks. Configurations are selected by choosing the configuration with the features which are installed on each truck. Alternately you can find your current configuration numbers in the 9.3X part number column and select the corresponding 9.5X version. Only 1 copy of the Source code and 1 copy of each configuration part number need be ordered since the file may be copied and used in multiple computers/trucks. If you are not currently running 9.3X software then the brake air pressure sensor must be changed out before going to 9.5X software. Contact the dealer for detailsof this change.

Description Of Chart 1 And Chart 2 Column Headings

Model: Sales model of the truck.

Wiring: How the truck was wired from the factory. "2 Brk" represents the truck was manufactured with only a single front and rear brake temperature sensor. "4 Brk" represents the truck was manufactured with brake temperature sensor for all 4 wheels (2 front, 2 rear). "NO AMB" represents the truck does not have an ambient temperature air sensor installed from the factory. Refer to following Note A.

Tractor: Trucks manufactured to tow trailers and have no body assembly or body-up lever events.

RAXL Cool Fan: Applicable to 793C (4AR) Off-Highway Trucks only. There is an option of having a cooler and fan on the rear axle filtration system. These trucks have this cooler and fan installed.

RAXL Fltr: Trucks are equipped with rear axle filtration system controlled by a 130-1643 SEMS Control Group located in the rear compartment of the operators station. The rear axle filtration system was effective with 785B (6HK523), 789B (7EK371), 793B (1HL323) and 793C (4AR1) Off-Highway Trucks.

NOTE: The 793C (4AR) rear axle filtration system is controlled directly by VIMS system and does not use the 130-1643 SEMS Control Group.

ADEM Ctrl Fan: Trucks are equipped with the ADEM Controlled Engine Cooling Fan. This fan is controlled directly by the engine controller and does not use a separate control like earlier fan controls did. The ADEM Fan was effective with 784B (5RK22) Tractors; 785B (6HK525), 789B (7EK392), 793B (1HL410) and 793C (4AR1) Off-Highway Trucks.

NOTE: When using a VIMS configuration that contains monitoring for the ADEM fan, the fan control must be enabled in the ADEM control parameter settings.

Smart Waste Gate: The smart waste gate is a boost control valve on the 793B (1HL) and 793C (4AR) Off-Highway Trucks. This valve is electronically controlled by the ADEM engine control.

Steer Temp SW: Certain trucks monitor the steering oil temperature. Steering temperature monitoring was effective with 793C (4AR400) Off-Highway Trucks.

N030: These configurations are custom shop items that customers have paid to be developed and should only be used by those customers. Use by other sites may result in undefined errors or logged events.

Lang: The indicated configurations have defined secondary languages as follows: Indo - Indonesian, Russ - Russian, Port - Portuguese, Swed - Swedish and Norw - Norwegian.

Comparison: These two columns show the new 9.5X part numbers which you should be running against the former 9.3X part numbers.

Note A: Effective with 9.5X release, trucks using only 2 brake temperature sensors will no longer be supported. These trucks will be provided with a retrofit package to convert them to a 4 brake temperature sensor configuration. Some of these trucks will also be receiving an ambient temperature sensor. These modifications must be performed before 9.5X software can be used. Contact dealer for information regarding the necessary modifications.

Note B: Contact factory for correct configuaration.