Allison Transmission AT 1545P Service Manual

1–4 Copyright © 1996 General Motors Corp.
AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
Figure 1–5. Transmission Nameplate
1–4. GENERAL DESCRIPTION
a. Automatic, Four Speeds. The AT 500 and
1500 Series transmissions have four forward speeds
and one reverse. Shifting within the forward ranges se-
lected by the operator is fully automatic.
b. Torque Converter and Lockup Clutch. An
Allison three-element torque converter (Foldout 1, 2,
or 3) transmits power from the engine to the transmis-
sion gearing. The torque converter serves as both a
fluid coupling and a torque multiplier. AT 1500 Series
transmissions also include a lockup clutch in the
torque converter assembly.
c. Planetary Gearing, Clutches. Ratios for four
forward speeds and reverse are established by plane-
tary gearing. The planetary gearing is controlled by
multiple-disc, hydraulic clutches. All gearing is in
constant mesh.
d. Main Control Valve Body. The main control
valve body consists of a series of spring-loaded spool
valves which are hydraulically actuated by the main
pressure produced from the charging pump.
1–5. OPERATING INSTRUCTIONS
Refer to SA1334 for operating instructions.
1–6. SPECIFICATIONS AND DATA
The specifications and data in Table 1–1 are applicable
to AT 500 and 1500 Series transmissions.
E
C
A
P
S
O
R
E
A
E
L
I
B
O
M
O
T
U
A
D
E
T
I
N
U
A
C
I
R
E
M
A
F
O
S
R
E
K
R
O
W
T
N
E
M
E
L
P
M
I
L
A
R
U
T
L
U
C
I
R
G
A
D
N
A
UAW
933
DIVISION OF
GENERAL MOTORS
CORPORATION
INDIANAPOLIS
INDIANA
SERIAL NO.
XXXXX
XX XXXXX
XXXXXXX
MODEL
NO.
PART NO.
V01251
Table 1–1. Specifications and Data
INPUT RATINGS — AT 1542 DIESEL
Value
Parameter
General Truck &
Road Sweeper
Transit & Airport
Shuttle Bus
Motorhome School Bus
Inner City &
Shuttle Bus
Unit
Input Speed
Maximum full load governed speed 4000* 4000* 4000* 4000* 4000* rpm
Minimum full load governed speed 2400 2400 2400 2400 2400 rpm
Minimum idle speed in drive 500 500 500 500 500 rpm
Input Power
Maximum net 180 (134) 160 (119) 180 (134) 180 (134) 180 (134) hp (kW)
Input Torque
Maximum net 405 (549) 340 (461) 405 (549) 405 (549) 405 (549) lb ft (N·m)
Turbine Torque
Maximum net 709 (961) 585 (793) 709 (961) 709 (961) 709 (961) lb ft (N·m)
Gross vehicle weight (GVW) 22050 (10002) 16540 (7500) 22050 (10002) 16540 (7500) 18520 (8401) lb (kg)
Gross combination vehicle weight (GCW) 22050 (10002) N/A 27010 (12252) N/A N/A lb (kg)
* 3200 rpm for TC 290

Allison Transmission AT 1545P Specifications

General

Brand	Allison Transmission
Model	AT 1545P
Category	Microphone system
Language	English