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Technical Service Information: Automatic Transmission Service Group

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Marcos Montes
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165 views2 pages

Technical Service Information: Automatic Transmission Service Group

Uploaded by

Marcos Montes
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Technical Service Information

48RE
NO TCC AND TRANS TEMP OVERHEAT
COMPLAINT: During a road test after a rebuild, it is noticed that there was no converter clutch apply. A scan tool
revealed that the computer was commanding the converter clutch to apply. It was also noticed
that transmission fluid temperature was up to 270 F. The vehicle was put on a hoist where cooler
flow was carefully checked in Drive and there was none.

CAUSE: A reconditioned pump was used that had its inner sleeve out of position (Figure 1) compromising
the converter clutch and cooler circuits (Figure 2).

CORRECTION: Replace the pump assembly.

Sleeve Located Incorrectly

A
AA 118
A
4 118 54
28 5
5 528

Bad Pump Good Pump

Copyright © 2015 ATSG

Figure 1

17-11
AUTOMATIC TRANSMISSION SERVICE GROUP Page 1 of 2
Technical Service Information
48RE
NO TCC AND TRANS TEMP OVERHEAT

PUMP BODY

TCC "On"
PUMP STATOR
TCC "On"
TCC "Off"
Rear (Forward)
Clutch Apply TCC "Off"
Front (Direct)
Clutch Apply Rear (Forward)
Clutch Apply
Pump
Suction
Front (Direct)
Clutch Apply

Pump
Pressure Pump
Pump Pressure
Suction

Copyright © 2015 ATSG

Figure 2

17-11
AUTOMATIC TRANSMISSION SERVICE GROUP Page 2 of 2

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