2003/05/05 New Engine Software Improves the Engine Compression Brake and Throttle Lock Operation {1920, 7620} Caterpillar


New Engine Software Improves the Engine Compression Brake and Throttle Lock Operation {1920, 7620}
`
2003/05/05 [SEPD0681]
ELECTRICAL AND STARTING SYSTEM
ELECTRONICS GP-ENGINE
2003/05/05 New Engine Software Improves the Engine Compression Brake and Throttle Lock Operation {1920, 7620}
Wheel Dozer:
834G (S/N: 6GZ1-UP)
Landfill Compactor:
836G (S/N: 7MZ1-UP)
Wheel Loader:
988G (S/N: 2TW1-UP)

Description of Change:

988G Wheel Loader and 834G Wheel Dozer Only

Improvements to the Engine Compression Brake

The new engine software better controls the engine compression brake and rpm. With the former software, the engine brake operated to 950 RPM and the lockup torque converter disengaged at 1250 RPM. This could cause the machine to increase in ground speed.

The new software controls the engine compression brake in order to slow the machine until engine speed is reduced to 1400 RPM and the engine brake disengages. The engine compression brake engages again at 1500 RPM. This disengage/engage strategy controls the engine speed between 1400 and 1500 RPM when the engine brake pedal is held down continuously in the appropriate gear for the grade. The lockup torque converter stays engaged and machine speed is controlled with minimal acceleration and deceleration.

The engine brake pedal should be held down for correct operation. The engine compression brake will cycle on and off in order to control the engine RPM and the ground speed. The operator will no longer need to manually cycle the engine brake. Some use of the brakes may be required to make a complete stop at the bottom of the grade.

Improvements to the Resume Feature of the Throttle Lock

The resume/accel switch can be used to resume the throttle setting after the operation of the engine compression brake is complete. The operator is no longer required to reset throttle lock after each application of the engine compression brake.

Improvements to the Speed Setting of the Throttle Lock

The speed setting of the throttle lock matches the position of the throttle control instead of the engine RPM at that moment. This allows the throttle lock to be set to high idle during operation.

Note: Ensure that all configurable parameters are correctly enabled/disabled.

836G Landfill Compactor Only

Improvements to the Speed Setting of the Throttle Lock

The speed setting of the throttle lock matches the position of the throttle control instead of the engine RPM at that moment. This allows the throttle lock to be set to high idle during operation.

Note: Ensure that all configurable parameters are correctly enabled/disabled.

Adaptable To: The new 223-6513 Engine Ratings Electronic Software is used on the 988G Wheel Loader. The new 223-6513 Engine Ratings Electronic Software is a direct replacement for the former 198-8516 Engine Ratings Electronic Software .

The new 223-6512 Engine Ratings Electronic Software is used on the 834G Wheel Dozer. The new 223-6512 Engine Ratings Electronic Software is a direct replacement for the former 198-8515 Engine Ratings Electronic Software.

Information System:

3406E and 3456 Generator Set Engines E173 High Exhaust Temperature Warning
Bench Test Procedure for a D9R Track-Type Tractor Transmission with Differential Steering {3030, 3073}
3500B Series II Marine Engines E100 Low Engine Oil Pressure Warning
3500B Series II Marine Engines E040 Low Engine Oil Pressure Shutdown
AD30 Underground Articulated Truck Braking System System Pressure - Release
2003/05/26 A Rework Procedure is Now Available to Improve the Mounting of the Ripper Valve {5351, 6310}
3516B Generator Set Engines with Dynamic Gas Blending Factory Passwords
963C Track-Type Loader Power Train Pressure Override Valve - Adjust
3046 Engine for Caterpillar Built Machines Glow Plugs - Test
963C Track-Type Loader Power Train Charge Relief Valve - Test and Adjust
3500 Industrial Engines Accumulator
973K Track-Type Loader Final Drive Oil Sample - Obtain
AD30 Underground Articulated Truck Machine Electrical System Circuit Breaker
AD30 Underground Articulated Truck Machine Electrical System Main Power Relay
3054E Industrial Engine Fuel Injection Pump - Install
IT62G Series II Integrated Toolcarrier and 950G Series II and 962G Series II Wheel Loaders Rated Load
IT62G Integrated Toolcarrier and 950G and 962G Wheel Loaders Plate Locations and Film Locations
IT62G Series II Integrated Toolcarrier and 950G Series II and 962G Series II Wheel Loaders Engine Starting
IT62G Series II Integrated Toolcarrier and 950G Series II and 962G Series II Wheel Loaders Lift Kickout
3500 Industrial Engines Accumulator Pressure - Test
IT62G Series II Integrated Toolcarrier and 950G Series II and 962G Series II Wheel Loaders Cooling System Coolant Sample (Level 1) - Obtain
2003/05/12 New Front Crankshaft Seals and New Rear Crankshaft Seals are Now in Production {1160, 1161}
D5N Track-Type Tractor Monitoring System
IT62G Series II Integrated Toolcarrier and 950G Series II and 962G Series II Wheel Loaders Differential and Final Drive Oil Sample - Obtain