Type . . . Constant mesh, spur type, planetaryRange Ratios*:First . 3.45:1Second 2.25:1Third. . 1.41:1Fourth . 1.00:1Reverse 5.02:1. Gear ratio does not include torque converter ratio.
Power takeoff provisionConverter driven (SAE 6-bolt Regular Duty PTO)Location Right side (viewed from rear)Drive gear ratio . All ranges--1.0O x turbine speedDrivegearrating. .::::. .2oolbft(270N.m)continuous;25olbft(340N.m)intermittent
OilsystemOilType Dexron ll@, C 4Capacity (excluding external circuit). . . . 20 U.S. qts (18.9 liters) (Wstd. oll pan)Filter . Full flow, replaceable element, remote mountedCooler . Remote mounted(Filter and cooler not furnished on transmission assembly but are supplied by vehicle manufacturer.)
SizeLength . . . .27.2 in (691 mm)Width. ... 20.7 in(526mm)Height . . 18.9 in (480 mm)Weight (dry) . . 289lbs (131 kg)
+ Vocational ratings may vary by vocation. Consult Allison Transmission Sales for specific information.
Transmission Crcss.section
CONVERTER.DRIVENPOWER TAKEOFF
DRIVE GEAR
TOROUE CONVERTER FORWARD CLUTCH FoURTH CLUTCH
THIRD CLUTCH SECOND CLUTCH
FIRST AND/ REVEBSE CLUTCH
.:: .PEED.,\4ETER
AT 545OIL SCREEN
t}esign Featurcs & Benelits
. Designed for use with diesel andgasoline engines up to 235 nhp (175kW). Four fonruard ranges and onereverse. This transmission model isbest suited for school buses, fueldelivery, beverage delivery, generalP&D, limited transit coach and light-duty dump truck applications.
. Clutches are multidisc design, oil-cooled, hydraulically-operated, andself-compensating for normal wear.Spur-type planetary gears are de-signed for strength, quietness, andlong life.
. Automatic upshifting and downshift-ing within each drive range. Built-ininhibitors prevent downshifts or shiftsinto reverse unless vehicle speed iswithin an acceptable range.
{ DRIVE GEAH
GOVERNOR ORIVE
. The Allison three-element torqueconverter provides smooth, shock-free operation. A choice of convert-ers permits matching the AT 545 to awide variety of engines.
. Converter-driven power take-offdrive on right side of transmission(as viewed from the rear) is stan-dard. Design is SAE 6-bolt.
. Provisions for neutral start switch,reverse signal switch, SAE regular-duty thread-type speedometerdrive, electronic speedometer drive,and parking brake.
.5.3 inch oil pan is standard. Option-al shallow pan is available whenground clearance dictates its use.
Typical
t___F\-r@-',6rSTEPVAN
t---------t-,-BP & D TFTUCK
T---h_\er-Ld
Applications.I-E_lm--ffiTANKEF TRUCK
LEASE/RENTAL VEHICLE
FLAT BED TRUCK
NOTE: The AT 545 is not approved for use rn garbagepackers over 9 cubic yards or lrucks with front mountedsnow plows.
' Other applications are available.Consult your local distributor for details.
SCAAN Specification Assistance.
To be sure that you get the most effi-cient engine/transmission package foryour operation, in your territory withyour preferred vehicle, your localAllisonTransmission distributor offersSCAAN.
SCAAN stands for System for
Qomputerized Application ANalysis andhelps take the guesswork out of vehicle-buying decisions. What's more, it doesso quickly and accurately through com-puter terminals located at all distributoroutlets. This means rapid analysis ofyour vehicle needs on the spot.
SCAAN can compute a wide varietyof vehicle performance parameters:including gradeability, acceleration andretardation. SCAAN will also checkyour powertrain specifications againstAllison Transmission vocational experi-ence to insure satisfactory vehicleperformance.
SCAAN is user friendly. lnteractiveoperation allows alternate vehicle con-figurations to be quickly evaluated toinsure optimized powertrain selection.
