MANIFOLD G. 4L4173 - Caterpillar

The table on illustration 3 is an example of abnormal transmission shifting due to the use of the brakes.The high numbers 4169, 564, 27, 1185, 546, 87, 1649, 141, 28, 267, 38, 152, 23, 92, 1, 48 are generated by the following sequence of events that are carried out by the machine operator.Situation 1 (1) The machine is moving forward in gear and the operator applies the service brake. (2) The transmission rapidly downshifts.Reference: Systems Operation, Testing and Adjusting, RENR3442, "Articulated Trucks Power Train Electronic Control System", "Rapid Downshift Function"Reference: Systems Operation, Testing and Adjusting, RENR8035, "Articulated Trucks Power Train Electronic Control System", "Rapid Downshift Function" (3) At this point, the machine is stationary. The operator then selects neutral gear, reverse gear, or a low gear with the transmission control lever before releasing the service brake.Situation 2The down shifting in this case can also be related with the rapid down shifting which has been described. The following actions may be a result of rapid downshifting and braking. (1) The machine is moving forward in gear and the operator applies the service brake. (2) The transmission rapidly downshifts. (3) The operator is moving the transmission control lever to reverse gear, neutral gear, or a low gear. At the same time, the operator releases the service brake for more than half of a second.The transmission will now log two shifts on the shift matrix. The first shift is the rapid downshift from a high gear to a point when the brakes are first released. The second shift would be the rapid downshift when the service brakes are reapplied. This action would also depend on the position of the lever for the transmission control before the brakes are released for the second time.The rapid shifting of the transmission is seen in the following list:
Second gear to neutral gear. This event occurred on 4169 occasions.
Third gear to neutral gear. This event occurred on 564 occasions.
Fourth gear to neutral gear. This event occurred on 27 occasions.
Second gear to reverse gear. This event occurred on 1185 occasions.
Third gear to reverse gear. This event occurred on 546 occasions.
Fourth gear to reverse gear. This event occurred on 87 occasions.
Third gear to first gear. This event occurred on 1649 occasions.
Fourth gear to first gear. This event occurred on 141 occasions.
Fifth gear to first gear. This event occurred on 28 occasions.
Fourth gear to second gear. This event occurred on 267 occasions.
Fifth gear to second gear. This event occurred on 38 occasions.
Fifth gear to third gear. This event occurred on 152 occasions.
Sixth gear to third gear. This event occurred on 23 occasions.
Sixth gear to fourth gear. This event occurred on 92 occasions.
seventh gear to fourth gear. This event occurred on 1 occasion.
Seventh gear to fifth gear. This event occurred on 48 occasions.These figures are a result of heavy braking which will result in high brake temperatures, premature brake wear, and premature transmission failure.Rapid Upshift
Illustration 4 g01084279The table on illustration 4 is an example of rapid downshifting of the transmission which