TIRE-SOLID 2263734 - Caterpillar

Illustration 1 g00813690
(1) Transmission upshift switch (2) Transmission downshift switch (3) Transmission direction control switch
Illustration 2 g00814152
Right Side of the Cab, Overhead (4) Manual position (5) Transmission auto/manual switchThe power train ECM automatically shifts the transmission if the four-position auto/manual switch (5) is in one of the three AUTO positions. The power train ECM evaluates the input that is sent from the engine speed sensor, transmission speed sensors and the torque converter output speed sensor in order to regulate transmission shifts. The power train ECM does not allow automatic upshifts to a speed that is higher than the speed that is selected with the auto/manual switch.
Table 1
Automatic Upshift and Automatic Downshift (1)    
Speed Range and Direction Shift     Transmission Speed in RPM    
1F to 2F     338    
2F to 3F     603    
3F to 4F     1067    
4F to 3F     961    
3F to 2F     543    
2F to 1F     304    
1R to 2R     386    
2R to 3R     689    
3R to 4R     1220    
4R to 3R     1098    
3R to 2R     620    
2R to 1R     348    
( 1 ) The speeds that are listed are approximate. The speeds that are listed should be used for reference only.The operator can override the autoshift function by depressing transmission downshift switch (2). The operator must perform one of the procedures that follow in order to resume automatic upshifts. Either depress transmission upshift switch (1), or shift to a different direction of travel. Momentarily depressing transmission downshift switch (2) signals the power train ECM to downshift the transmission by one speed. Pressing and holding transmission downshift switch (2) signals the power train ECM to continue to downshift the transmission as the machine speed decreases.When the key start switch is turned from the OFF position to the ON position, the power train ECM is activated. When the power train ECM is first activated all the modulating valves (transmission clutch) are de-energized regardless of the position of transmission direction control switch (3). The power train ECM then determines if transmission direction control switch (3) is in the NEUTRAL position. The power train ECM disables the transmission if the NEUTRAL position is NOT selected. If the NEUTRAL position is NOT selected, transmission direction control switch (3) must be returned to the NEUTRAL position before a direction can be selected. The power train ECM activates the start relay and the power train ECM allows the engine to start if transmission direction control switch (3) is in the NEUTRAL position. The power train ECM allows the initial selected speed to be changed if transmission direction control switch (3) is in the NEUTRAL position.Note: Transmission direction control switch (3) must be in the NEUTRAL position when the key start switch is turned to the START position. If transmission direction control switch (3) is not in the NEUTRAL position, the start relay will not be activated when the key start