CRANKSHAFT AS 4P4334 - Caterpillar

"Rating Number"
The rating number is the selected rating within a power rating family. The personality module defines the power rating family ( 242 kW (325 hp)) and the personality module may contain only one or several ratings. The rating number defines the power rating that is used within the power rating family. The following list illustrates examples of the power rating:
324 kW (435 hp) at a governed engine speed of 1800 rpm
324 kW (435 hp) at a governed engine speed of 2100 rpmBoth ratings will be displayed for multitorque applications."Multi-Torque Ratio"
This parameter is used to select the desired multitorque trip point. Multitorque ratings allow the engine to provide additional torque, additional horsepower, and torque when the transmission is operating in higher gear. The additional torque allows the truck to crest a hill without downshifting and increases fuel economy. The multitorque feature also helps to reduce wear. The trip point is determined by a ratio of engine speed versus vehicle speed. The three programmable options represent the different trip points that are listed below.
Table 1
Programmable Option Turn On Ratio (RPM to MPH)
"MT-A" 27.9
"MT-B" 33.0
"MT-C" 38.0 Note: This feature is not used with standard engine ratings. This feature is only available for multitorque ratings.
Table 2
Type of Engine Rating Alternatives Default
Standard Ratings Unavailable Unavailable
Multitorque Ratings "MT-B"
"MT-C" "MT-A" "Aftertreatment Regeneration Device Configuration Code"
This parameter identifies the particular Aftertreatment Regeneration Device (ARD) that is installed on the engine. This parameter is programmed at the factory.If this parameter is not programmed, the Electronic Control Module (ECM) activates a 253-2 diagnostic code and the engine speed is limited to low idle. Contact the Caterpillar ECM Hot Line if this parameter must be programmed.