Allison Transmission AT 543 Service Manual

Copyright © 1996 General Motors Corp. v
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Paragraph Page
TABLE OF CONTENTS
Section 1. GENERAL INFORMATION
1–1. SCOPE OF MANUAL
a. Coverage. . . . . . . . . . . . . . . . . . . . . . . . . .1–1
b. Illustrations. . . . . . . . . . . . . . . . . . . . . . . .1–1
c. Maintenance Information . . . . . . . . . . . . .1–1
1–2. SUPPLEMENTARY INFORMATION . . . .1–1
1–3. ORDERING PARTS
a. Transmission Nameplate . . . . . . . . . . . . .1–1
b. Parts Catalog. . . . . . . . . . . . . . . . . . . . . . .1–1
1–4. GENERAL DESCRIPTION
a. Automatic, Four Speeds . . . . . . . . . . . . . .1–4
b. Torque Converter and Lockup Clutch . . .1–4
c. Planetary Gearing, Clutches. . . . . . . . . . .1–4
d. Main Control Valve Body . . . . . . . . . . . .1–4
1–5. OPERATING INSTRUCTIONS. . . . . . . . . .1–4
1–6. SPECIFICATIONS AND DATA . . . . . . . . .1–4
Section 2. DESCRIPTION AND OPERATION
2–1. SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2–1
2–2. MOUNTING
a. To Engine . . . . . . . . . . . . . . . . . . . . . . . . .2–1
b. To Vehicle . . . . . . . . . . . . . . . . . . . . . . . .2–1
2–3. INPUT DRIVE. . . . . . . . . . . . . . . . . . . . . . . .2–1
2–4. TRANSMISSION HOUSING. . . . . . . . . . . .2–1
2–5. TORQUE CONVERTER ASSEMBLY
AND LOCKUP CLUTCH
a. Description . . . . . . . . . . . . . . . . . . . . . . . .2–1
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . .2–1
2–6. OIL PUMP ASSEMBLY
a. Description . . . . . . . . . . . . . . . . . . . . . . . .2–2
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . .2–2
2–7. FORWARD CLUTCH AND
TURBINE SHAFT
a. Description . . . . . . . . . . . . . . . . . . . . . . . .2–2
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . .2–2
2–8. FOURTH CLUTCH
a. Description . . . . . . . . . . . . . . . . . . . . . . . .2–3
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . .2–3
2–9. SECOND AND THIRD CLUTCH AND
CENTER SUPPORT
a. Description . . . . . . . . . . . . . . . . . . . . . . . .2–3
b. Operation of Third Clutch . . . . . . . . . . . .2–3
c. Operation of Second Clutch . . . . . . . . . . .2–4
2–10. FIRST CLUTCH
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–4
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2–11 PLANETARY GEAR UNIT
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–4
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2–12. SPEEDOMETER DRIVE/SPEED
SENSOR WHEEL
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–5
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2–13. GOVERNOR
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–5
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2–14. MODULATOR
a. Vacuum Modulator. . . . . . . . . . . . . . . . . 2–5
b. Mechanical Modulator . . . . . . . . . . . . . . 2–5
c. Electric Modulator . . . . . . . . . . . . . . . . . 2–5
2–15. OIL PAN AND FILTER
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–6
b. Function . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2–16. HYDRAULIC RETARDER
a. Description . . . . . . . . . . . . . . . . . . . . . . . 2–6
b. Operation . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2–17. MAIN CONTROL VALVE ASSEMBLY . . 2–7
2–18. HYDRAULIC SYSTEM
a. System Functions . . . . . . . . . . . . . . . . . . 2–7
b. System Schematic. . . . . . . . . . . . . . . . . . 2–7
c. Filter, Pump Circuit . . . . . . . . . . . . . . . . 2–7
d. Main-Pressure Circuit (Red). . . . . . . . . . 2–7
e. Converter-In (Yellow), Converter-Out
(Orange), Lubrication (Green) Circuits . . 2–8
f. Selector Valve, Neutral, Forward
Regulator Circuit (Orange and Yellow) . . 2–8
g. Governor Valve, Governor Circuit
(Green and White) . . . . . . . . . . . . . . . . . 2–8
h. Modulator Pressure Circuit
(Red and Green) . . . . . . . . . . . . . . . . . . . 2–8
i. Clutch Circuits . . . . . . . . . . . . . . . . . . . . 2–9
j. Hold Regulator Valve. . . . . . . . . . . . . . . 2–9
k. Automatic Upshifts. . . . . . . . . . . . . . . . . 2–9
l. Automatic Downshifts . . . . . . . . . . . . . . 2–9
m. Downshift Inhibiting. . . . . . . . . . . . . . . . 2–9
n. Trimmer Valves . . . . . . . . . . . . . . . . . . 2–10
o. Priority Valve . . . . . . . . . . . . . . . . . . . . 2–10
p. Trimmer Regulator Valve. . . . . . . . . . . 2–10

Allison Transmission AT 543 Specifications

General

Brand	Allison Transmission
Model	AT 543
Category	Microphone system
Language	English