TIB-6751

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SB-10050959-2835
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Technical Information Bulletin
CX31 Transmission Overheating in CT660 On-Highway Trucks{7000}
Media Number -TIBU6751-00
Publication Date -24/07/2012
Date Updated -24/07/2012
Caterpillar: Confidential Yellow
i04968069
CX31 Transmission Overheating in CT660 On-Highway
Trucks{7000}
SMCS - 7000
On-Highway Transmission:
CX31 (S/N: D9F1-UP)
On Highway Truck:
CT660 (S/N: TRK1-UP; TKL1-UP; TGT1-UP; TSW1-UP; TSY1-UP)
Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent
solution is known, use the temporary solution that is identified below.
Problem
Transmission overheating issues have been observed on CT660 equipped with the CX31 non-retarder
transmission. Overheating seems to have been caused in steep grade situations and on certain
configurations of trucks.
Root Cause
• Driver leaving transmission in gear with parking brake applied. (enable auto neutral)
• Truck specifications for application used is incorrect (first gear lock-up or rear gear change
needed)
• Cooler undersized for application/operating conditions.
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Solution
Work with the DSN to determine proper repair procedure. Dealer to fill out CX31 overheat check list
located on "dealer.cat.com" before contacting DSN.
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