Meritor RideSentry MPA Series Maintenance Manual
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Meritor RideSentry MPA Series Maintenance Manual

Sliding tandem trailer air suspension system
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Maintenance Manual 14R
RideSentry™ MPA Series Sliding Tandem
Trailer Air Suspension System
Revised 12-18

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Summary of Contents for Meritor RideSentry MPA Series

  • Page 1 Maintenance Manual 14R RideSentry™ MPA Series Sliding Tandem Trailer Air Suspension System Revised 12-18...
  • 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 Heavy Vehicle Systems, LLC, 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: Exploded View Section 6: Slider Removal, Installation and Adjustment RideSentry™ MPA Series Sliding Tandem Trailer Air Suspension System Check Body Rail Specifications Installation Section 2: Introduction Slider-to-Trailer Retrofit Description Slider Repositioning Components Section 7: Diagnostics Features Identification Troubleshooting Section 3: Inspection and Maintenance Section 8: Specifications...

  • Page 4: Section 1: Exploded View

    Slider Slide Rail, Roadside Lower Inner Sleeve, Bushing Inner Metal Hold Down Clip Upper Axle Seat Lock Pin Operation Label Upper Control Arm Lower Axle Seat Upper Bushing Clevis, Shock Axle Assembly, Rear Height Control Linkage Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 5: Section 2: Introduction

    2 Introduction Description 2 Introduction The Meritor RideSentry™ MPA Series sliding tandem trailer air suspension system centers around a stabilized parallelogram design that incorporates a single unified frame bracket. The upper and lower control arms are parallel to each other. The air springs mount directly over the axle.

  • Page 6: Components

    18.5-inch ride height has two 1.0-inch spacers under the air spring. A mounting height of 24.5-26.5-inches (62.2-67.3 cm). Components Frame brackets and slider assembly Upper and lower control arms Axle assemblies Air springs Shock absorbers Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 7: Identification

    MPA XX S XX XX XXXX Sequence Number: Can be cross referenced to the Bill of Material. Axle Type Nominal Ride Height Sliding Subframe Suspension Rating x 1000 lbs. Suspension Model 4006708a Figure 2.4 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 8: Section 3: Inspection And Maintenance

    Damage to components can result. If the upper control arm bushings are ragged or have loose pieces that protrude from them: Replace the bushings. Refer to Section 4 for the upper control arm bushing removal and installation procedures. Meritor Maintenance Manual 14R (Revised 12-18)
  • Page 9 12. Shock Absorber — Upper and Lower 13. Height Control Linkage — Upper and Lower 14. Height Control Valve Mounting Bolt 15. Slider Hold Down Clip FRONT ROADSIDE 2/3* 7/5* ROADSIDE *CURBSIDE SIMILAR 4006709a Figure 3.1 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 10: Maintenance Slider

    Repair as needed. Inspect the front and rear hold down clips to ensure that they are secured correctly around the body rails. Figure 3.2 WEAR PAD WEAR PAD LOCKING HOLD DOWN CLIP 4006710a Figure 3.2 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 11: Trailer Air Suspension

    LOWER SEAT CONTROL 4006711a If the condition exists: Contact the Meritor OnTrac™ ARMS Customer Call Center at 866-668-7221. Figure 3.3 Inspect the flex member of the air springs for cuts and abrasions. Replace the air spring if it is cut or damaged.

  • Page 12: Axle Inspection And Maintenance

    Replace the height control valve. Inspect the height control valve for air leaks and a cracked lever arm housing. If air leaks or cracks are detected: Replace the height control valve. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 13: Section 4: Component Removal, Installation And Adjustment

    Disconnect the linkage. Replace bent or damaged linkage. PORT LEVER Remove the height control valve from the bracket. Figure 4.1. BOLT TORQUE 50-55 LB-IN Figure 4.1 (6 N•m) 4006714a Figure 4.2 HEIGHT CONTROL VALVE MOUNTING BRACKET 4006713a Figure 4.1 Meritor Maintenance Manual 14R (Revised 12-18)
  • Page 14 You must maintain the correct ride height when you change an HCV. this bolt. Refer to the trailer manufacturer’s specifications for the correct ride INFLATE height. ADJUSTING 30°-45° SCREW HEIGHT 30°-45° CONTROL VALVE DEFLATE LINKAGE 4006716a Figure 4.4 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 15: Air Spring

    Support the trailer with safety stands. Verify that all the air has been exhausted from the air system. Remove the air inlet line and fitting from the damaged air spring. Figure 4.7. Meritor Maintenance Manual 14R (Revised 12-18)
  • Page 16 13. Install the fitting and inlet air line to the top of the air spring. Apply a sealant tape. 14. Seat the valve at the bottom of the air tank. Pressurize the air system. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 17: Upper Control Arm

    Use a roadside or curbside side plate repair Figure 4.9 kit. If a loose fastener is at the upper axle seat and damage is found: Replace the upper axle seat. Contact the Meritor OnTrac™ Customer Call Center at 866-668-7221 for parts and kits. Figure 4.8...
  • Page 18 A-3256-H-1152. Wear is not permitted between the bushing inner metal Using light mineral oil, Meritor specification O-92-B, lightly and its mating surfaces. lubricate the outside diameter of the bonded bushing.
  • Page 19 WASHERS BOLT PIVOT AXLE 4006719a Figure 4.16 25. Install the locknut and tighten to 450-500 lb-ft (611-678 N m). Figure 4.17. FLAT WASHER FRAME UPPER CONTROL ARM BRACKET/AXLE BUSHING TUBE SEAT 4005084a Figure 4.15 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 20: Lower Control Arm

    Insert new bushings into the lower control arm ends. Insert the inner sleeve through the bushings. Use light mineral oil, Meritor specification O-92-B for lubrication. Center the inner sleeve in the lower control arm ends.
  • Page 21 4011177a ROADSIDE Figure 4.18 Figure 4.19 Figure 4.20 Install new hardware loosely. UPPER CONTROL ARM UPPER CONTROL ARM UPPER AXLE SEAT WASHER NEW THRUST WASHERS BOLT 4011178a THRUST 4011179a WASHERS Figure 4.19 Figure 4.20 Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 22: Axle Alignment

    To obtain the correct alignment, the difference between difference between measurements A and B must not exceed measurements C and D must not exceed 1/16-inch 1/8-inch (3.175 mm). Figure 4.21. (1.588 mm). Figure 4.21. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 23: Auto-Dump Configuration

    Auto-Dump valve pilot port. (6 N•m) 4006715a Figure 4.22. Figure 4.23 Install the air lines in the correct ports as shown in Figure 4.22. All tubing must be SAE J844 Type B. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 24: Section 5: Welding

    You must follow correct welding procedures when you weld to any suspension components. Incorrect weld placement will void Meritor’s warranty and can reduce the fatigue life of the trailer axle beam. Serious personal injury and damage to components can result.

  • Page 25: Section 6: Slider Removal, Installation And Adjustment

    Check the following dimensions on the trailer to ensure that the Using the lift truck, position the new suspension, with the tires Meritor RideSentry™ MPA Series sliding tandem trailer air installed, under the trailer. Figure 6.1. suspension system correctly fits the trailer.
  • Page 26 TP-0696, and the torque specification warning label, part number TP-97126, to the trailer. Figure 6.3. To obtain the labels, contact the Meritor OnTrac™ Customer Call Center at 866-668-7221. 17. Check the trailer ride height. Adjust as necessary. Refer to HOLD DOWN Section 4.

  • Page 27: Slider Repositioning

    Check that the main body of each lock pin extends through the holes in the rails. Follow Step 6 at each stop before you operate the vehicle and pull the trailer. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 28: Section 7: Diagnostics

    Build the air pressure to 65 psi (448 kPa) or more. Check supplied to the suspension tandem. the compressor for correct function. Check all the air lines and fittings leading to the suspension tandem for leaks. Repair or replace as necessary. Meritor Maintenance Manual 14R (Revised 12-18)
  • Page 29 The lock pin control valve is leaking Replace the lock pin control valve. air or will not reset when the trailer parking brakes are released. Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 30: Section 8: Specifications

    Lower Air Spring Nut 30-35 41-47 Shock Absorber — Upper and Lower 225-275 305-375 Height Control Linkage — Upper and Lower Height Control Valve Mounting Bolt Slider Hold Down Clip 85 Dry 115 Dry Meritor Maintenance Manual 14R (Revised 12-18)

  • Page 31: Section 9: Special Tools

    The bushing tool part number A-3256-H-1152 consists of the following components. Figure 9.1. Draw plate Draw bolt Two flat washers Draw nut Figure 9.1 FLAT DRAW PLATE DRAW NUT WASHER DRAW BOLT FLAT WASHER PART NUMBER A-3256-H-1152 4005081a Figure 9.1 Meritor Maintenance Manual 14R (Revised 12-18)
  • Page 32 Meritor Heavy Vehicle Systems, LLC 2135 West Maple Road Printed in USA Troy, MI 48084 USA 866-OnTrac1 (668-7221) Copyright 2018 Revised 12-18 meritor.com Meritor, Inc. Maintenance Manual 14R (16579)

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