CHAIN G 0690543 - Caterpillar

Table 1
Required Parts    
Item    Qty    New Part Number    Description    Former Part Number    
1     1     389-8198     Input Shaft     352-0387    To determine if the TCOS rotor is loose on the shaft, insert a suitable tool in the TCOS sensor port to check if the rotor spins freely on the shaft. If the rotor spins freely, update the transmission with the new 389-8198 Input Shaft This change is effective with 320-7253 Torque Converter Gp with serial number T1N03674, which is installed in 303-2298 Transmission Ar with serial number K2S03894.The improved Torque Converter Input Shaft is adaptable to the following machines:
735B (S/N: L4D1-436)
735B (S/N: T4P1-359)
740B (S/N: L4E1-2395)
740B (S/N: L4F1-440)
740B (S/N: T4R1-1605)
740B (S/N: T4S1-337)The improved Torque Converter Input Shaft is effective in production in the following machines:
735B (S/N: L4D437-UP)
735B (S/N: T4P360-UP)
740B (S/N: L4E2396-UP)
740B (S/N: L4F441-UP)
740B (S/N: T4R1606-UP)
740B (S/N: T4S338-UP)Troubleshooting
If the machine exhibits any of the following behavior, follow the actions below to diagnose the issue:
Harsh or rough shifting
Inability to shift into gears
Inability to hold a gear (transmission upshifts from 3F to 4F but quickly downshifts back to 3F)
Perform a transmission calibration. If the transmission fails calibration, troubleshoot the transmission based on the reason for failure.
Illustration 1 g03408981
Access plate to be removed
Illustration 2 g03408986
TCOS sensor
Illustration 3 g03408989
Area to insert a suitable tool
Illustration 4 g03408991
Tool through the TCOS sensor port, applying force to the rotor
If the transmission calibration does not resolve the issue, inspect the TCOS rotor. Remove the access plate on the left-hand side of the torque converter to access the TCOS sensor. Refer to Illustration 1. Remove the TCOS sensor. Refer to Illustration 2. Insert a suitable tool through the TCOS sensor port to engage with the TCOS rotor. Refer to Illustration 3. Apply a small amount of force to the rotor to determine if the rotor is loose on the shaft. Refer to Illustration 4. If the TCOS rotor spins freely on the shaft, the rotor is loose on the shaft.Note: There are typically no diagnostic or event codes logged that will indicate there is an issue with the TCOS rotor being loose on the shaft.Note: If the TCOS rotor is slipping on the shaft, there will be an inconsistent speed between engine output speed and torque converter output speed. Caterpillar ET datalogs do not provide enough frequency resolution to detect this mismatch.