NHTSA ID Number: 10156697
Manufacturer Communication Number: TT7693EN
TSB/Document Date: 2019-04-08
Summary
Tech Tip for diagnosing and remedying C3/C4 bonded piston issue
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Tech Tip Worksheet - P/N 29552373 C3/C4 Bonded Piston Failure – InformaƟon
Transmission S/N ___________________ VocaƟon_________________OEM_______________Model_____________
Vehicle Miles/Km/Hours _________________ Miles/Km/Hours since last trans Ňuid change_________________
Transmission Fluid Level (qts. or liters - low/high)___________________________________________
Transmission Cooler Type Remote/Integral & Model_______________________________________
Results of test for presence of Ethelyne Glycol (ppm)_______________________________________
(Gly-Tek TestKit - Nelco Company - 1047 McKnight Road South Saint Paul, MN 55119 651.738.2014 - hƩp://www.gly-tek.com/index.htm)
Are any of the DTC's shown below acƟve or inacƟve in the failure records? Indicate "acƟve", "inacƟve" or "no"
AcƟve / InacƟve / No DTC
P0729
P0732
P0733
P0735
P0736
P0777
DTC DescripƟon
Incorrect 6th Gear RaƟo
Incorrect 2nd Gear RaƟo
Incorrect 3rd Gear RaƟo
Incorrect 5th Gear RaƟo
Incorrect Reverse RaƟo
Pressure Control Solenoid (PCS2) Stuck On
AcƟve / InacƟve / No DTC
P0796
P0797
P088A
P0894
P2714
P2715
DTC DescripƟon
Pressure Control Solenoid (PCS 3) Stuck Oī
Pressure Control Solenoid (PCS 3) Stuck On
Transmission Filter Maintenance Alert
Unexpected Mechanical Gear Disengagement
Pressure Control Solenoid (PCS 4) Stuck Oī
Pressure Control Solenoid (PCS 4) Stuck On
Clutch Test:
Yes / No
Yes / No
Turbine Speed in 2nd range? (circle Yes or No)
Turbine Speed in 3rd range? (circle Yes or No)
Vehicle and InstallaƟon Photographs:
Breather locaƟon - showing in parƟcular exposure to splash from wheels, operaƟon, etc.
Both sides of transmission - showing dipsƟck, Įll tube, Įll tube seal, stopper, stopper seal, etc.
Any point of water entry into transmission.
Transmission Fluid Sample:
Collected per Allison InstrucƟon Sheet #297 (on the Allison Transmission Extranet)
Note: Allison Transmission uses ASTM D6304 TitraƟon method to determine water
content in transmission Ňuid
% If transmission Ňuid sample is analyzed locally reported water content in percent (%)
Note: New Transynd has water content of approximately 0.03%. Test results below this
level should be considered inaccurate.
Conversion from ppm to percent (%): ppm x 0.0001 = %
Conversion from percent (%) to ppm: X% x 10,000 = ppm
Collect Power Oī StaƟc Data Įle:
Yes / No Has the TCM in the vehicle ever been replaced? (circle Yes or No)
Connect to transmission with Allison DOC - AcƟon Request -> Read StaƟc Data
Disassembly Photos:
Photo of Front Support Assembly below Converter Housing Breather Port
Photo inside Converter Housing - cast surface below Breather Port
C3 StaƟonary Clutch front view prior to removing Bonded Piston - locaƟon of failure
C4 StaƟonary Clutch front view prior to removing Bonded Piston - locaƟon of failure
Failed Bonded Piston - locaƟon of failure seen aŌer removal from Clutch Housing
Copyright 2015 Allison Transmission, Inc. All Rights Reserved.
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TSB/Document ID: TT7693EN
Replacement Service Bulletin Number:
MFR Communication Date: 2015-08-24
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