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    MT2923EN

    MT4108EN

    Mechanics Tips

    MD 3070PT SeriesTransmissions

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    i

    MT2923EN

    Mechanics

    Tips

    Allison TransmissionMD 3070PT

    February 1995Rev 1: June 2000

    Printed in U.S.A. Copyright 2007 Allison Transmission, Inc.

    Allison Transmission, Inc.

    P.O. Box 894 Indianapolis, Indiana 46206-0894

    www.allisontransmission.com

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    ii

    IM PORTANT SAFETY NOTICE

    IT IS YOUR RESPONSIBILITYto be completely familiarwith the warnings and cautions used in this manual. Thesewarnings and cautions advise against using specific serviceprocedures that can result in personal injury, damage to theequipment, or cause the equipment to become unsafe. Thesewarnings and cautions are not exhaustive.Allison Transmissioncould not possibly know, evaluate, or advise the service trade of

    all conceivable procedures by which service might be performedor of the possible hazardous consequences of each procedure.Consequently, Allison Transmission has not undertaken any suchbroad evaluation. Accordingly, ANYONE WHO USES ASERVICE PROCEDURE OR TOOL WHICH IS NOTRECOMMENDED BY ALLISON TRANSMISSION MUSTfirst be thoroughly satisfied that neither personal safety nor equip-ment safety will be jeopardized by the service procedures used.

    Proper service and repair are important to the safe and reliableoperation of the equipment. The service procedures recom-mended by Allison Transmission and described in this manualare effective methods for performing service operations. Someservice procedures require using tools specially designed for theprocedure. Use special tools when and as recommended.

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    iii

    TABLE OF CONTENTS

    Paragraph Description Page

    SECTION I PREVENTIVE M AINTENANCE11. Periodic Inspection And Care . . . . . . . . . . . . . . . . . . . . . . . 1

    12. Importance Of Proper Transmission Fluid Level. . . . . . . . . 1

    13. Transmission Fluid Check . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    14. Keeping Fluid Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

    15. Fluid Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

    16. Transmission Fluid And Filter Change Intervals . . . . . . . . . 7

    17. Transmission Fluid Contamination . . . . . . . . . . . . . . . . . . . 8

    18. Transmission Fluid And Filter Change Procedure. . . . . . . . 919. Fluid Leak Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

    110. Breather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    111. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    112. Transmission Stall Test And Neutral

    Cool-Down Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    SECTION II REMOVING TRANSMISSION

    21. Draining Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    22. Disconnecting Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    23. Uncoupling From Driveline, Engine, And Vehicle . . . . . . . 22

    24. Removing The Transmission . . . . . . . . . . . . . . . . . . . . . . . . 22

    25. Removing Output Flanges Or Yokes . . . . . . . . . . . . . . . . . . 22

    SECTION III PREPARING THE TRANSM ISSION FOR

    INSTALLATION31. Checking Input Components . . . . . . . . . . . . . . . . . . . . . . . . 23

    32. Installing Output Flange Or Yoke . . . . . . . . . . . . . . . . . . . . 23

    33. Installing PTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    34. Installing Scavenge Pump . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    35. Installing Fill Tube And Seal . . . . . . . . . . . . . . . . . . . . . . . . 25

    36. Checking Plugs And Openings . . . . . . . . . . . . . . . . . . . . . . 25

    SECTION IV PREPARING VEHICLE FOR TRANSMISSION

    INSTALLATION

    41. Engine, Transmission Adaptation Requirements. . . . . . . . . 26

    42. Checking Flexplate Drive Assembly . . . . . . . . . . . . . . . . . . 28

    43. Chassis And Driveline Inspection . . . . . . . . . . . . . . . . . . . . 29

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    Paragraph Description Page

    44. Cooler, Filter, And Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

    45. Checking Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

    SECTION V INSTALLING TRANSMISSION

    INTO VEHICLE

    51. Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

    52. Mounting To Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

    53. Installing Transmission Mounting Components . . . . . . . . . 36

    54. Coupling To Driveline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

    55. Connecting Power Takeoff Controls . . . . . . . . . . . . . . . . . . 36

    56. Connecting Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3757. Connecting Speedometer Drive . . . . . . . . . . . . . . . . . . . . . . 37

    58. Connecting Electrical Components . . . . . . . . . . . . . . . . . . . 38

    59. Filling Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

    510. Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

    SECTION VI CHECKS AND ADJUSTM ENTS

    61. Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

    62. Road Test And Vehicle Operation Checklist . . . . . . . . . . . . 42

    SECTION VII CUSTOM ER SERVICE

    71. Owner Assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

    72. Service Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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    v

    PREFACE

    This handbook is a mechanics reference for removing, installing, or maintaining anMD 3070PT Automatic Transmission. All features of the transmission and the vehi-cle involved in installation procedures are discussed. The information presented will

    help the mechanic remove, install, and maintain the transmission in a manner thatassures satisfactory operation and long service life. For additional detailed informa-tion, refer to the appropriate transmission service manual and electronic controlstroubleshooting manual.

    TRADEM ARKS USED

    DEXRON

    is a registered trademark of General Motors Corporation.

    Pro-Link

    is a registered trademark of Microprocessor Systems, Inc.

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    vi

    CONVERTER HOUSINGMODULE

    PTO DRIVE GEARCONVERTER HOUSING

    ROTATING CLUTCH MODULE

    TURBINE SHAFTC1 CLUTCHC2 CLUTCH

    CONTROL MODULEHYDRO-ELECTRONIC CONTROLS

    MAIN HOUSING MODU MAIN HOUSING C3 CLUTCH C4 CLUTCH C5 CLUTCH

    P1 MODULE

    CONVERTER MODULETURBINE

    PUMPSTATORLOCKUP

    CLUTCH/DAMPER

    FRONT SUPPORT/OIL PUMP MODULE FRONT SUPPORT

    OIL PUMP

    MD 3070PT

    SEVEN-SPEED WITH TRANSFER CASE, CLOSE RAT

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    MD 3070PT TRANSMISSION LEFT REAR-VIEW

    MD 3070PT TRANSMISSION RIGHT FRONT-VIEW

    E01707.02

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    viii

    V01725

    MAIN

    C2

    C4

    C1

    LU

    C3

    MD 3070PT TRANSMISSION BOTTOM-VIEW

    C6

    C5

    V01726

    T-CASECONNECTOR

    C7

    MAIN

    MD 3070PT TRANSFER CASE FRONT-VIEW

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    1

    PREVENTIVE

    MAINTENANCE

    SECTION

    I

    11. PERIODIC INSPECTION AND CARE

    Clean and inspect the exterior of the transmission at regular intervals. Severity of

    service and operating conditions determine the frequency of these inspections.

    Inspect the transmission for:

    loose bolts transmission and mounting components

    fluid leaks repair immediately

    loose, dirty, or improperly adjusted throttle sensor linkage

    damaged or loose hoses

    worn, frayed, or improperly routed electrical harnesses

    worn or out-of-phase driveline U-joints and slip fittings

    A label describing on-vehicle welding precautions is available from your authorized

    Allison service dealer and should be installed in a conspicuous place. A vehicle used

    in a vocation that requires frequent modifications or repairs involving welding must

    have an on-vehicle welding label.

    12. IM PORTANCE OF PROPER TRANSMISSION FLUID LEVEL

    Transmission fluid cools, lubricates, and transmits hydraulic power.

    Always maintain proper fluid level. If fluid level is too low, the torque

    converter and clutches do not receive an adequate supply of fluid and the

    transmission overheats. If the level is too high, the fluid aerates causing

    the transmission to shift erratically and overheat. Fluid may be expelled through the

    breather or dipstick tube when the fluid level is too high.

    CAUTION: When welding on the vehicle:

    DO NOT WELDon the vehicle without disconnecting from

    the ECU all control system wiring harness connectors.

    DO NOT WELDon the vehicle without disconnecting ECU

    battery power and ground leads.

    DO NOT WELDon any control components.

    DO NOT CONNECTwelding cables to any control components.

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