K25229168

Solution K25229168
Thursday, December 6, 2018 8:36:20 PM CET
Mack Models
Mack Model
GR-Granite , PI-Pinnacle , AN-Anthem , CHU-Pinnacle, Axle back , CXU-Pinnacle,
Axel forward , GU-Granite , TD-Titan
Volvo Models
Volvo Model
VNR , VT , VNX , VNL , VNM , VHD , VAH
Engine family
Engine family
11L Engine , 13L Engine , 16L Engine , MP7 , MP8 , MP10
Emission Standard
Emission Standard
US07 , US10 , US14 , US15 , US16 , US17 , OBD2017 , 2018
** SOLUTION **
Title
Automated Manual Transmission Gearbox Will Not Shift To High Range After Gearbox
Repair; MID 130 PSID 24 FMI 1, P1072-92 Unintentional Disengagement Of High
Range - US07 And Newer Emissions, Model Year 2008 And Newer
Cause
REMAN gearboxes may have the incorrect high range synchronizer hub installed.
There are several tooth designs (tooth spacing/pitch) for the high range synchronizer
cone and its mating parts. There is only one tooth design used in North America ( NA
). There have been instances where REMAN short gearboxes, synchronizer kits or range
housings kits have gotten the incorrect mating parts installed. The resulting mismatch
between the two components will cause the unit to not shift into high range. The unit
will pass calibration and all shifting tests when installed in the truck because the teeth
will mesh just enough to allow the calibration and tests to pass, however in operation the
inability of the unit to fully engage will cause a complaint/symptom of grinding when
shifting to high range or wont shift to high range (Gears R2 and 7-12). In either case the
unit cannot engage the high range cone and transfer power to the driveline. The unit will
operate normally in the lower gears (R1-6).
Solution
Inspection of the tooth spacing for the components prior to installation will eliminate any
potential mismatch of components and extended diagnostic time resulting from the incorrect
components.
The correct tooth spacing is approximately 10 millimeters from the center of each tooth
on the high range synchronizer center hub.
The Part Number for the correct center hub is 21448626.
The incorrect fine tooth hubs have a Part Number of 21753650.
What you will see in Tech tool if the unit gets assembled this way.
Reviewing the Gears Test ( 4311-08-04-01 ) , calibration values ( 4320-07-03-01 ) or the
Range Solenoid Test ( 4320-08-03-02 ) screens, the high range engagement will show to be
barely within the valid calibration/engagement area. The teeth will mesh just enough to allow
a good calibration and test results however the teeth are not engaged and the torque applied to
the unit will force the range out of gear.
The average high range engaged position is 33 mm (1.31 inches) range.
Solution visibility
Dealer distribution
Support Area
Americas
Function(s)/component(s) affected
Function affected
gear shifting , engagement
Function Group
Function Group
43 gearbox
Customer effect
Main customer effect
acceleration/speed , efficiency/abnormal behavior
Noise
grinding
Road behaviour
driveability
Fault code(s)
OBD 2013 Diagnostic
Trouble Codes
NA_MIDs
P1072-92
MID 130 PSID 24 FMI 1
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
when driving
random
Other conditions
after a workshop procedure on the vehicle
Administration
Author
UT9268H
Dealer ID
UT9268H
Last modified by
A241298
Creation date
17-10-2018 15:10
Date of last update
06-11-2018 22:11
Review date
17-10-2019 00:10
Status
Published
NA_Reviewer
UT9268h
NA_Author_Group
GTT