TT-019-2016 Automated Manual Transmission ( AMT ) Bearing And Gear Shaft Inspection – Volvo

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Solution
Codes associated with this complaint:
P1071- Split Engagement System, FTB 96 Unintentional disengagement of direct split
P1057- Main Shaft Speed Sensor, FTB 21 Data valid but below operational range
Most probable cause:
Loss of main shaft pre-load from a spigot bearing failure
Cause The customer has a driveability complaint for the vehicle bucking, slipping, or engine surging when in reverse.
** SOLUTION **
Transmission , , , , AMT-F With Crawler Gears AMT-F Without Crawler Gears AMT-C AMT-D A
MT-F AMT-C AMT-D AMT-F With Crawler Gears AMT-F Without Crawler , , , ,
Gears
Transmission
Engine family , , , , , 11L Engine 13L Engine 16L Engine MP7 MP8 MP10
Engine family
Volvo Model VNL VNM VNR VNX VAH VHD VT , , , , , ,
Volvo Models
Mack Model AN – Anthem CHU – Pinnacle, Axle back CXU – Pinnacle, Axle front GR – Granite , , ,
, , , GU – Granite PI – Pinnacle TD – Titan
Mack Models
Title ** Tech Tip ** – TT-019-2016 Automated Manual Transmission ( AMT ) Bearing And Gear Shaft Inspection
** SOLUTION **
Solution K10216390
Monday, June 3, 2019 7:09:39 PM CEST
Recommended Actions: Review pictures and perform instructions below
Towing Related Failure (Image 1)
Towing Related Failure (Image 2)
Spalled bearing failure (Image 3)
Spalled bearing race (Image 4)
Additional checks:
Reviewing DTC readout can be helpful in determining spalled vs. towing damaged spigot bearing. Main shaft speed codes prior to any towing event can indicate that the loss of main shaft pre-load may have begun before the truck was towed to the shop. This means that the bearing started to spall before the unit was towed improperly.
Spalled Bearing Failure (Image 5)
Spalled Bearing Race (Image 6)
These images (5 & 6) represent a failure that went ignored for some time.
While the main shaft does not have evidence of heat as in the towing example (image 1), there are additional parts that have been affected:
• Contact with the main shaft nut
• Rollers missing and race worn down
• Oil distribution tube twisted off and closed
• P1 bearing damaged
• Split synchro ring broken
Clues that this may have been a spalled, or otherwise damaged, spigot bearing is:
1. The ridge in the input shaft. This is similar to what is seen in the spalled spigot bearing failure . image 3
2. The DTC readout, as in the example below. The vehicle clock is incorrect however you can assume that the “Last Occurrence” has to be close to the readout day. In this example you can see that there had been main shaft codes for ~2 mo and split shift codes for ~3mo
Code Description:
P1071- Split Engagement System, FTB 96 (FMI 1) Unintentional disengagement of direct split
Fault Condition:
High split jumps out
The split cylinder valves are inactive
Possible Symptom:
Yellow lamp is illuminated
Loss of torque
Possible Cause:
N/A
P1057 (PID 160) Main Shaft Speed Sensor, FTB 21 (FMI 1) Data valid but below operational range
Fault Condition:
The sensor signal is within normal range and, the main shaft speed differs from both the value of the countershaft speed and the vehicle speed received from the vehicle ECU. The following conditions must be fulfilled for a time of 2.0 seconds in order to activate:
A gear (not neutral) is engaged in the transmission
The value of the input shaft speed calculated from the main shaft speed sensor (SESM) is more than 300 rpm
The value of the input shaft speed calculated from the counter shaft speed sensor (SESC) is more than 300 rpm
Possible Symptom:
Yellow lamp is illuminated
Slow gear changes
Rough gear changes
Possible Cause:
N/A
Status Published
Date of last update 30-05-2019 16:05
Creation date 10-11-2016 21:11
Last modified by RU4469V
Author ut01793
Administration
Vehicle operating mode , , , acceleration in reverse engagement during engagement
Conditions
OBDII Diagnostic Trouble
Codes (P, U, B Format)
P1057 P1071 ,
Fault Codes And Error Codes
Main customer effect , judder slipping
Customer effect
Function Group 431 gearbox, manual
Function Group
Function affected , , , , TT engagement Input Shaft Main Shaft Front Housing (Gearbox)
Function(s)/component(s) affected
Solution visibility Dealer distribution

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