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Meritor Wabco MM-1012 Maintenance Manual

Selective catalytic reduction air control unit
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Maintenance Manual MM-1012
Selective Catalytic Reduction Air Control
Unit
Issued 02-10

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Summary of Contents for Meritor Wabco MM-1012

  • Page 1 Maintenance Manual MM-1012 Selective Catalytic Reduction Air Control Unit Issued 02-10...
  • Page 2 Information contained in this publication was in effect at the time the publication was approved for printing and is subject to change without notice or liability. Meritor WABCO reserves the right to revise the information presented or to discontinue the production of parts described at any time.

  • Page 3: Table Of Contents

    Contents Section 1: Introduction pg. 1 System Overview Identification How the ACU Works Schematics Section 2: Removal and Installation Replacement Requirements General Requirements Replacement Procedures ACU Replacement ACU Removal ACU Installation Section 3: Troubleshooting Oil and Other Contaminants ACU Replacement Diagnostics Section 4: Specifications General Requirements...

  • Page 4: Section 1: Introduction

    This design will have two inlets and one emission system repaired. outlet. Figure 1.1. Figure 1.1 NORMALLY OPEN NORMALLY CLOSED 975 009 101 0 975 009 002 0 4007993a Figure 1.1 Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)

  • Page 5: Schematics

    SENT TO EXHAUST 4007994a NORMALLY CLOSED CONFIGURATION Figure 1.2 Figure 1.3 PRIMARY SECONDARY AIR CONTROL UNIT UREA/AIR UREA UREA UREA MIXTURE SENT TO TANK PUMP DOSER EXHAUST NORMALLY OPEN CONFIGURATION 4007995a Figure 1.3 Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)

  • Page 6: Section 2: Removal And Installation

    Figure 2.1 support. WESTERN STAR, ALL MODELS The ACU is 3-PC. 2V2 UPRIGHT EXHAUST located under 4007999a the lower flange of the left side Figure 2.4 frame rail behind the cab. 4007996a Figure 2.1 Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)

  • Page 7: General Requirements

    Using two new fasteners, bolt the ACU to the bracket and tighten the fasteners to 11 ft-lb (15 N m). Verify the removed air lines are clean and then connect them to the new ACU. Connect the vehicle electrical harness to the ACU. Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)

  • Page 8: Section 3: Troubleshooting

    The check valve is stuck in the closed Replace the ACU. position. Air pressure delivered to the SCR dosing unit The pressure limiting portion of the ACU is not Replace the ACU. is too high or too low. functioning. Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)

  • Page 9: Section 4: Specifications

    Temperature (ambient operating range) –40°F to 175°F (–40°C to 80°C) Electrical Power 12 +/− 3V DC Minimum Inlet Pressure 87 psi (6 bar) Maximum Working Pressure 145 psi (10 bar) Installed Position No Restriction Meritor WABCO Maintenance Manual MM-1012 (Issued 02-10)
  • Page 10 Meritor WABCO Vehicle Control Systems 2135 West Maple Road Printed in USA Troy, MI 48084-7121 800-535-5560 Copyright 2010 Issued 02-10 meritorwabco.com ArvinMeritor, Inc. Maintenance Manual MM-1012 (16579/22882)

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