SC0399

SAFETY RECALL
Mack Trucks Inc.
Greensboro, NC USA
Note: Also applies to Mack Trucks Australia.
Date
Number
Page
4.16
SC0399
1(4)
CRD 151 Carrier Yoke Nut Inspection
SAFETY RECALL INFORMATION
Mack Trucks Inc. has determined the cap nut that retains the interaxle driveshaft yoke to
the rear axle input shaft may be subject to premature loosening on certain CHU, CMH,
CMM, CXU, GU, LEU, LR, MRU and TD model vehicles. The potential risk is that if the
nut comes off, the yoke can separate from the axle input shaft and cause the driveshaft
to disconnect. If this occurs, a disconnected driveshaft can disable the vehicle and result
in debris in the roadway, which increases the risk of a vehicle crash.
To address these concerns, Mack has developed an inspection procedure that will help
identify suspect components and prevent the possibility of future damage. Follow the
procedure outlined in this document. Contact your local Mack Trucks dealer to schedule
the inspection.
VEHICLES AFFECTED
Certain 2012 through 2015 model Mack vehicles manufactured from September 1, 2011
through April 30, 2014 equipped with Mack proprietary axle. Models and Model Years
are CHU, CMH, CMM, CXU, GU, LEU, MRU, TD 2012 – 2015; LR 2015.
VEHICLE QUANTITY
There are 25,588 (20,741 U.S., 1068 Canada, 405 Mexico, 415 Australia, 2959 Export)
vehicles affected by this recall.
Page 2
INSPECTION PROCEDURE
You must read and understand the precautions and guidelines in Service Information,
Function Group 40, “General Safety Practices” before performing this procedure. If you
are not properly trained and certified in this procedure, ask your supervisor for training
before you perform it.
Note: Information is subject to change without notice. Illustrations are used for reference
only, and may differ slightly from the actual vehicle being serviced. However, key
components addressed in this information are represented as accurately as possible.
Do not attempt to repair or service this vehicle without having sufficient
training, the correct service literature and the proper tools. Failure to
follow this could make the vehicle unsafe and lead to serious personal
injury or death.
1. Verify service program eligibility by checking service program status in VDA.
2. Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheels, and placing the transmission in neutral.
3. Inspect rear axle yoke and nut (rear-rear axle on tandem chassis).
4. If input pinion seal is leaking it is assumed the yoke and nut are loose and vehicle MUST
be placed out of service and the parts expedited for the vehicle to be repaired prior to
the vehicle leaving.
a. Vehicles with CRD 151 axles in trucks produced since September 2012 will have
tamper detection sealant on the nut and yoke. If this is cracked or shows to have
moved the nut is loose. The sealant may be painted over and be difficult to see.
When in doubt check the axial movement of the yoke and pinion.
b. If the yoke/nut has been removed previously then the sealant will not be in place.
Mack Trucks, Inc.
Safety Recall
Date
Number
Page
4.16
SC0399
3(4)
5. If the seal is not leaking or there is no tamper sealant like in the picture then check the
yoke and input shaft for excessive axial movement.
a. The input pinion bearing assembly is assembled with a preload and the yoke and
input pinion should not show any movement when inspected.
6. If yoke/pinion is deemed to be loose then the vehicle MUST be placed out of service and
the parts expedited for the vehicle to be repaired prior to the vehicle leaving.
7. If the seal is not leaking and the yoke and shaft are not loose then the vehicle can be
placed back in service.
8. Prior to placing a vehicle back in service, if the tamper detection sealant is not present,
clean an area on the nut and an adjacent area on the yoke. Paint a line across the joint
between the yoke and the nut using a contrasting color paint marker. Until the yoke nut
is replaced, visually inspect the paint line monthly for any indication of nut movement
relative to the yoke. On any inspection, if the nut is found to move relative to the yoke,
the vehicle MUST be placed out of service. Request parts to be expedited and perform
repairs prior to the vehicle leaving.
9. Remove wheel chocks.
If the vehicle is placed out of service for repair please call 1-877-986-5862 and provide the
following:
•
•
•
•
17 digit Vehicle Identification Number (VIN)
Recall Number (SC0399)
Dealer Code
Purchase Order Information (PO Information)
Page 4
REIMBURSEMENT
This repair is covered by an authorized Safety Recall campaign. Reimbursement is
obtained through the normal claim handling process.
Claim Type
(used only when uploading from the Dealer Business System)
40
Recall Status
Vehicle repaired per instructions
Labor Code
Primary Labor Code, Carrier Yoke Nut Inspection
4651-06-09-01 – 0.3
Note: If vehicle has failed inspection and repair is
performed, send email to [email protected] with
complete 17-digit VIN to request the vehicle be added
to SC0403.
hrs
Time to take charge of vehicle and determine
campaign status
1700-16-01-01 - 0.3 hrs
Causal Part
21187820
SCC Code
C6571
Note: Take Charge Time is not included in the labor code for this operation. Take
charge may be eligible, but can only be used once per vehicle repair visit. If the vehicle
is having other warranty repairs performed, take-charge should be charged to the
warranty repair, otherwise take-charge can be charged to this Safety Recall campaign.
Note: Dealers are to perform Safety Recall Campaigns on all subject vehicles at no
charge to the vehicle owner regardless of mileage, age of vehicle or ownership (original
purchaser or subsequent purchasers). Whenever vehicles are subject to a safety recall
are brought to your dealership for service, or taken into your dealership vehicle
inventory, it is strongly recommended that every effort be made to perform the recall
correction before the vehicle is sold or released to the owner.