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Solution K63231010
Thursday, May 28, 2020 1:31:28 PM CEST

** SOLUTION **
Title

Mack Chassis - Automated Manual Transmission ( AMT, mDrive ) Clutch
Control Actuator ( CCA ), Diagnostic And Inspection Information; CCA Reuse
Or Replace Guidelines - US07 And Newer Emissions, Common Model Years
2008 And Newer

Mack Models
Mack Model

AN - Anthem , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front , GR Granite , GU - Granite , PI - Pinnacle , TD - Titan

Emission Standard
Emission Standard

US07 , US10 , US10+OBD13 , US14+OBD13 , US14+OBD15 ,
US14+OBD16 , US17+OBD16 , US17+OBD18 , US17+OBD19

Engine family
Engine family

MP7 , MP8 , MP10

Transmission
Transmission

AMT-F With Crawler Gears , AMT-F Without Crawler Gears , AMT-C , AMT-D
, AMT-F

** SOLUTION **
Cause

Information concerning the inspection and diagnosis of the clutch control
actuator and reuse/replace guidelines for observed wear.
The CCA is in constant contact with the clutch diaphragm spring. The
bearing face rotates constantly with the clutch. In an ideal situation, the
bearing face and clutch would always rotate at the same rate. However in
real-world operation there is always some slippage between the two, and
because of that there will be wear over time.

Solution

When Fault tracing for a shifting complaint or fault codes the
following items should be considered:

I. Gather information and check system function
1. Review service history to determine if the CCA has ever been
replaced. Note the vehicle's current age, mileage, and engine hours.
- High mileage or age of the vehicle can be a contributing factor in whether or
not the CCA is worn and causing control problems that are being picked up in
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the diagnostic that logs the codes listed in the Fault Codes section.

2. Using Premium Tech Tool ( PTT ), perform the clutch tests below.
Review the results to get a baseline of the health of the system.
NOTE: If a failure is identified, the failure should be investigated and
repaired. The remaining tests should only be completed if the problem is
still present following the repair. Warranty will not cover time spent on
tests performed after an issue is found.
- 4111-08-03-02 - Clutch Wear Check, Test
- 4111-08-03-05 - Clutch Drag, Test
- 4111-08-03-06 - PWM Valves Clutch Activation, Test
- 4313-08-03-01 - Counter Shaft Brake Solenoid Valve, Test
- 4320-08-03-01 - Clutch Cylinder, Test
- 4320-08-03-32 - PWM Valves Clutch, Test

II. Check the Clutch Control Actuator (CCA) for leaks,
Inspect Clutch components

• While this is intended to evaluate CCA function prior to removing the
transmission from the chassis, the steps below may also be performed with
the transmission out of the vehicle and PTT connected directly to the TECU.
• When evaluating the CCA for a leak and the unit still in the chassis, the
Clutch Leak Test in PTT will likely pass in all but the most severe cases.
Even when it does fail, the cause may not be the CCA. The airline or the
CVU may be the cause.

1. From the Test tab in PTT, open operation 4320-08-03-32 PWM
Valves Clutch. Run the Leak Test. This will cause the TECU to stop its
attempts to release the clutch.
• NOTE: If the tests from section I were run immediately before this step and
the ignition has not been cycled, this step may be skipped.

2. Open operation 4311-08-03-02 - Input Signals for Gear Selection
from the Test tab in PTT. Expand the sections for Clutch and Gear.
Refer to the animations below for Steps 3 and 4. The first method
shown is preferred.

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0:00 / 0:35

Method 1: Connect a hand-operated vacuum pump to the air
supply port for the CVU. Drawing a vacuum via this port will
compress the CCA.

0:00 / 0:21

Method 2: Insert a pry bar through the CVU opening. Making
sure the electrical harness is held aside, use the pry bar to
compress the CCA. Plug the CVU air supply port once correct
position is reached.

When using a pry bar, do not use excessive force on the CCA. Damage to
the housing or other components could result.
The electrical harness is not a suitable surface for leverage and must be
held out of the way when using a pry bar.

3. Unbolt the CVU and remove it from the housing. Leave the
electrical connector plugged in.
4. Compress the CCA approximately half of its total travel.
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5. Leave the vacuum pump connected or plug the air supply port.
6. In PTT, watch the value for Clutch Cylinder Position.
• If the value increases, there is an air leak in either the CCA or one of the
air supply components that should be located and repaired.
• If the value remains the same, proceed to the next step.

A CCA assembled with the rubber boot to prevent dirt and debris intrusion
will most likely not be the source of an air leak. Other components should
be checked carefully first , then the CCA checked thoroughly as outlined in
section III-3 below.

7. Holding the electrical harness to the side, insert a pry bar into the
CVU opening and rock the CCA back and forth as shown below.

0:00 / 0:20

• Some play is normal and acceptable unless air leakage is observed while
moving the CCA.
• If excessive play is observed, the CCA will need to be replaced. An example of
excessive play (transmission removed for example only) can be viewed below:

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0:00 / 0:05

8. Watch the Clutch Cylinder Position signal in PTT while moving the
CCA as shown in the animation above.
• If the signal shows large fluctuation, jumps or creeps up in value, the
CCA is worn and allowing air to pass around its seals.
• If the signal shows a small fluctuation but returns to the same value
each time, the CCA is not leaking.

9. If the CCA is not leaking, inspect the other clutch components
while the CCA is still compressed. A borescope is useful for this.

III. After removing the gearbox
1. Check the face of the CCA bearing for wear.
- The example below shows a bearing face with normal wear, caused by
the movement between the clutch fingers and the bearing face.

Wear as shown above does not cause a functional issue. The bearing
should be reused if nothing else is found wrong.

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- NOTE: With excessive wear accompanied by a clutch replacement,
Replacement of the CCA should be considered as well.

2. Check the function of the CCA Bearing
- The bearing should turn freely and smoothly.

3. Check the CCA Guide Sleeves
The CCA has guide sleeves inside the assembly to keep the unit centered
on the clutch. A video of a new, properly functioning CCA can be viewed
below:

0:00 / 0:17

3.1. Compress the CCA about half way back in its travel and rock the bearing
from side to side.
- Some play is normal and acceptable unless air leakage is observed while moving
the CCA.
- If excessive play is observed, the CCA will need to be replaced. Refer to the
video in the previous section for an example of excessive play.

4. Check for Air Leaks

If performing this portion of the test with the gearbox removed: Air
must be supplied to the Gearbox or to the CVU directly to more closely
simulate normal operating conditions.
Failure to do this may lead to a false indication of a leak.
4.1. Push the CCA all the way back and plug the Clutch Valve Unit ( CVU ).

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0:00 / 0:07

4.2. Observe the CCA for movement.
- If air leaks out immediately and the CCA cannot hold position, replace
the CCA and its air supply line.
- If air does not leak immediately but the CCA exhibited excessive wear,
rock the CCA from side to side as shown in the video below:

0:00 / 0:09

- If air leaks are observed, replace the CCA and the o-rings for the air supply
line. The airline o-rings are available as a kit in IMPACT. The air line should not
be replaced unless it is damaged. There is normally nothing wrong with the
airline itself and the o-rings are all that is needed.
- If rocking the bearing does not produce an air leak, the CCA is likely not
leaking.

5. Check for Heat Damage
- A CCA that has had a clutch failure with extreme heat should be
inspected using the above procedures. A melted center dust boot or
missing dust boot with extreme wear should be replaced. A CCA that
passes all of the tests but has a melted position sensor can be reused
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and the sensor replaced separately. An example is shown below:

IV. Check The Transmission Electronic Control Unit (TECU)
Software Level - Vehicles built between 11/16 and 6/17
with an AMT-F ONLY
• If the software is not the current version:
1. Update the TECU software if the SW is 23090996 or older.
2. Test drive the vehicle to ensure there are no other issues, then release.
• If the software is current:
1. No further action is required.

NA_Sister solutions

K58556584

Solution visibility

Dealer distribution

Function(s)/component(s) affected
Function affected

MID 130 – TECU , engagement , Clutch Control Actuator (CCA)

Function Group
Function Group

412 release bearing, fork, shaft , 413 clutch control , 43 gearbox

Customer effect
Main customer effect

noise , diagnostics/methodology , efficiency/abnormal behavior , judder ,
slipping

Noise

hissing noise , blowing noise

Fluid problem

leak

Fluid implicated

Air

Road behaviour

driveability

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Fault Codes And Error Codes
J1939 Fault Codes
(MID-PID-FMI Format)

MID 130 PSID 27 FMI 7 , MID 130 PSID 27 FMI 8

OBDII Diagnostic
Trouble Codes (P, U, B

P1075-38 , P1075-94

Format)

Conditions
Vehicle operating
mode
Frequency of
occurrence of problem
Location of problem

when activating , when driving , cruise control , when stationary

random
underneath cab

Administration
Author

RU4469V

Dealer ID

RU4469V

Last modified by

RU4469V

Creation date

10-07-2018 19:07

Date of last update

13-05-2020 18:05

Review date

22-06-2019 00:06

Status

Published

NA_Reviewer

ut9268h

NA_Author_Group

GTT

Variantes Kola
RWX - TRANSMISSION

D SERIES - AT2612D - VPT AUTOMATED TRANSMISSION 2600NM 12SPEED ,
F SERIES , AT2812D - VOLVO AUTOMATED TRANSMISSION 2800NM
12SPEED

UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.

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