17TS10

No.: 17 TS-10
April 10, 2017
TO:
Dealers Only
FROM:
Service Systems Development
SUBJECT:
Detroit™ DT12™ Split Rod Bushing Repair
Note: This document supersedes Technical Service Letter 16 TS-22.
ISSUE
Detroit™ DT12™ automated manual transmissions may experience difficulty going into gear,
especially when the transmission is not at operating temperature.
CAUSE
The steel split rod wears on the aluminum transmission housing, causing the split rod to stick.
The Shift Controller cannot read the correct position of the split rod and will not shift into gear.
To correct this, a hardened steel bushing and new design split rod with three flattened sides
were implemented with transmissions built in August, 2016. For Detroit-built transmissions
(transmission serial number beginning with 716), the change took place on August 9, 2016, with
approximate transmission serial number 716310E0008107. For German-built transmissions
(transmission serial number beginning with 715), the change took place on August 29, 2016,
with approximate transmission serial number (last seven digits) 1806530. See Figure 1 for the
new bushing and split rod.
Figure 1 – New Steel Bushing and Split Rod
Detroit Diesel 13400 Outer Drive, West / Detroit, Michigan 48239-4001
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REQUIRED ACTION
Refer to new symptom-based diagnostics for a complaint of “Cold Gear Engagement” found in
the Detroit Transmissions Manual (DDC-SVC-MAN-0140). The troubleshooting will indicate
whether or not a split rod bushing repair is necessary.
REQUIRED MATERIAL
The necessary parts to install the new bushing and split rod are contained in service kit
P/N: A 960 268 23 74. The new kit is also shown in PartsPro in design group 342.
REPAIR PROCEDURE
In the Detroit Transmissions Manual (DDC-SVC-MAN-0140), reference the chapter titled
“Internal Component Repair” and section “Split Rod Bushing Repair”. A supplemental video can
be found on ddcsn.com. Go to Support, then Multimedia, then DT12 Transmission, then Split
Pin Bushing Repair. See Figure 2 for the new bushing installed in a transmission. Note how the
cut side of the bushing matches up with the transmission housing.
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Figure 2 – New Steel Bushing Installed
CLAIM PROCESS
Normal vehicle OEM in-warranty procedures apply. Proactive installations of the split rod
and bushing are not allowed under warranty.
If a mechanical failure is found in warranty, file the claim as follows.
• Claim type: 1 (base warranty) or 2 (extended coverage)
• Primary Failed Part: A 960 268 23 74.
• Fault type: 83
• Parts return: None.
Troubleshooting may include the following labor operations:
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Labor Operation 342-6030Q, Cascadia chassis, BUSHING, SPLIT PIN, DT12, R/R
Labor Operation 342-6030Q, Western Star 5700XE chassis, BUSHING, SPLIT PIN,
DT12, R/R
Admin Labor Operation 939-6010B
CONTACT INFORMATION
Please contact the Detroit™ Customer Support Center at 800-445-1980 or email
[email protected] if you have any questions.