Top Gear Function
This function is enabled at all times. This function limits the maximum ground speed of the machine. The Power Train/Chassis Electronic Control Module (ECM) prevents upshifting to any gear that is greater than top gear. The value for top gear is stored in the ECM. The value of the top gear is programmable by the Caterpillar Electronic Technician (ET). The value of the top gear is programmed at the factory to the maximum top gear for the particular machine.
Show/hide table
| Top Gear Function | |
| Minimum Gear | Maximum Gear |
| Two | Four |
Note: The ET service tool can be used to program the top gear function. Use the configuration screen in the ET service tool to change the top gear setting. The gear that is set for the ground speed limit will dictate the value that is set for the top gear function.
Caterpillar Information System:
990H Wheel Loader and 844H Wheel Dozer Braking System Hydraulic Tank and Filter (Implement, Brake)
966H Wheel Loader and 972H Wheel Loader Power Train Oil Filter (Power Train)
525C Wheel Skidder, 535C Wheel Skidder and 545C Wheel Skidder Power Train Transmission Oil Cooler
844H Wheel Dozer Hydraulic System Piston Motor (Hydraulic Fan)
2005/06/27 Abrasion Resistant Hoses Are Now Available for Wheel Skidders {5057, 6307}
990H Wheel Loader and 844H Wheel Dozer Machine Systems Ether Starting Aid
844H Wheel Dozer Hydraulic System Pilot Operated Hydraulic Control (Joystick)
C6.6 Engines for Caterpillar Built Machines Cylinder Block
966H Wheel Loader and 972H Wheel Loader Electrohydraulic System Tilt Cylinder (Logging Machines)
844H Wheel Dozer Hydraulic System Pilot Valve
525C Wheel Skidder, 535C Wheel Skidder and 545C Wheel Skidder Power Train Transmission Hydraulic System
IT62H Integrated Toolcarrier and 950H and 962H Wheel Loaders Power Train Differential and Bevel Gear - Install
IT62H Integrated Toolcarrier and 950H and 962H Wheel Loaders Power Train Oscillating Axle (Rear) - Remove
IT62H Integrated Toolcarrier and 950H and 962H Wheel Loaders Power Train Oscillating Axle (Rear) - Install
966H Wheel Loader and 972H Wheel Loader Power Train Modulating Valve (Transmission Clutch)
966H Wheel Loader and 972H Wheel Loader Power Train Fixed Axle and Oscillating Axle
AD30 Underground Articulated Truck Machine Systems Tailgate - Remove
AD30 Underground Articulated Truck Machine Systems Tailgate - Install
AD45B Underground Articulated Truck Machine Electrical System Heating and Air Conditioning
990H Wheel Loader and 844H Wheel Dozer Braking System Gear Pump (Pilot, Brake)
844H Wheel Dozer Hydraulic System Piston Pump (Hydraulic Fan with Standard to Mid Range Ambient Temperature Cooling)
904B Wheel LoaderPower Train Oscillating Axle (Rear), Axle Planetary, and Differential (Limited Slip) - Disassemble
C15 and C18 Tier 4 Final Engines Vibration Damper - Check
844H Wheel Dozer Hydraulic System Piston Pump (Hydraulic Fan with High Ambient Temperature Cooling)