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Allison Transmission AT 545 Service Manual

Allison Transmission AT 545
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3–28 Copyright © 1996 General Motors Corp.
AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
B. Abnormal Activities or Responses (cont’d)
Vehicle moves backward in neutral Shift selector linkage out of adjust-
ment.
Repair or replace linkage.*
Fourth clutch failed and dragging. Rebuild fourth clutch. Refer to Para-
graphs 5–3l and 7–6b.
Shift selector linkage defective or
broken.
Repair or replace linkage.*
Main pressure low. Refer to Chart E, Low Pressure.
Shift selector not engaged at control
valve.
Install or replace parts involved
(inside oil pan). Refer to Paragraphs
5–3h and 7–10a.
Low fluid level. Fill to proper fluid level. Refer to
Paragraphs 3–4 through 3–10.
Vehicle moves forward in neutral Incorrect idle speed. Adjust to correct idle speed.
Shift selector linkage out of adjust-
ment.
Repair or replace linkage.*
Forward clutch failed and dragging. Rebuild forward clutch. Refer to
Paragraph 6–8.
Reverse warning buzzers and/or
vehicle backup lights come on dur-
ing forward operation.
Improper 1–2 relay valve installed. Install new 1–2 relay valve. Refer to
Paragraph 6–6a(11).
C. Abnormal Stall Check Speed
High stall speeds Low fluid level. Add fluid to proper level. Refer to
Paragraphs 3–4 through 3–10.
Clutch pressure low. Refer to Chart E, Low Pressure.
Forward clutch slippage.** Rebuild forward clutch. Refer to
Paragraph 6–8.
First clutch slippage.** Rebuild first clutch. Refer to Para-
graphs 5–3q and 7–4a, b.
* Shift selector linkage must be free and secure. Hook up shift selector linkage — quadrant gates must agree with transmission model. Detent
positions at transmission must conform with gates on quadrant. Refer to vehicle service manual and to Paragraph 3–12a.
** Clutch slippage may be recognized by alternate racing and loading of the engine, which is at times, accompanied by a violent chatter. Refer to
slippage charts.
Table 3–13. Troubleshooting Chart (cont’d)
Problem Probable Causes Suggested Remedies

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Allison Transmission AT 545 Specifications

General IconGeneral
BrandAllison Transmission
ModelAT 545
CategoryMicrophone system
LanguageEnglish

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