Haldex L31298W Manual
INSTALLATION/SERVICE
MANUAL
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) For Single Axle Dollies L31298W
“Patent Pending”
Product Options
The Haldex Modular Dolly System (HMDS) with Brake Monitoring System (BMS) was designed to
be used on Single Axle Dollies.
Safety First
This manual describes the correct installation process for the Haldex Modular Dolly System (HMDS)
with Brake Monitoring System (BMS). Care must be taken during each phase of the installation in
order to ensure the system is installed and working properly.
Please follow your company’s safety procedures at all times when installing this equipment.
Be sure that you understand all instructions before you begin.
Remove all air pressure and electrical power from the brake system before beginning work.
Handling Requirements
The Haldex Modular Dolly System (HMDS) with Brake Monitoring System (BMS) requires proper
handling prior to and during installation. The HMDS should NEVER be lifted by way of tubing,
electrical cables or any components. Lifting MUST only be done by way of the panel itself. Failure
to do so may result in loose components and subsequent leakage, leading to panel function
degradation or failure.
Questions?
If you have any questions on this product or any of the innovative products offered by Haldex,
contact your local distributor for complete details. Technical Service or Troubleshooting help can
be obtained by calling Haldex Technical Services Department at 800-643-2374, Press 2.
Important Notices
The products described within this literature, including without limitation, product features,
specifications, designs, availability and pricing are subject to change by Haldex and its subsidiaries at any
time without notice. This document and other information from Haldex, its subsidiaries and authorized
distributors provide product and/or system options for further investigation by users having technical
expertise. It is important that you analyze all aspects of your application and review the information
concerning the product or system, in the current literature or catalog. Due to the variety of operating
conditions and applications for these products or systems, the user, through their own analysis and
testing, is solely responsible for making the final selection of the products and systems and assuring that
all performance, safety and warning requirements are met.
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
Table of Contents
Haldex Modular Dolly System (HMDS)
Fifth Wheel Assembly/Technical Information ...............................................................2
Haldex Modular Dolly System (HMDS)
Components Front/Technical Information ....................................................................3
Components Rear ...........................................................................................................4
Haldex Modular Dolly System (HMDS)
Plumbing - Front Side.....................................................................................................5
Plumbing - Front Side - Haldex Push/Pull Valve ............................................................6
Plumbing - Rear Side - Bendix®& Sealco®Push/Pull Valve ...........................................7
Haldex Modular Dolly System (HMDS)
Mounting Brackets .........................................................................................................8
Haldex Modular Dolly System (HMDS)
End of Line and PM Tests ...............................................................................................9
Air System and Electrical Tests ......................................................................................10
Functional Test for Brake Monitoring System (BMS)...................................................11
Functional Test for Reservoir Purge Valve (RPV)..........................................................12
©2018 All Rights Reserved
Material may only be reproduced with the written permission of Haldex.
Section Page
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 1
Additional Information
Installation and Troubleshooting Guides
available on the Haldex website.
Anti-Lock Braking Systems (ABS)
Installation/Service Manual (L30041)
https://www.haldex.com/globalassets/
north-america/documents/abs/l30041.pdf
Brake Monitoring System (BMS-1)
Installation/Service Manual (L31250W)
https://www.haldex.com/globalassets/
north-america/documents/abs/l31250W
Intelligent Trailer Control Module (ITCM)
Installation/Service Manual (L31286W)
https://www.haldex.com/globalassets/
north-america/documents/l31286W.pdf
Brake Monitoring System (BMS)
Installation/Service Manual (L31290W)
https://www.haldex.com/globalassets/
north-america/documents/l31290W.pdf
Haldex Modular Dolly System (HMDS) with Brake Monitoring System (BMS)
C-Channel Dimension Mounting: Approximate Height 5 1/4” x Width 3”
C-Channel Dimension (Option): Approximate Height 7 3/4” x Width 3”
Service/Control Air Line (IN): 3/8” Tubing (Blue)
Service/Control Air Line (OUT): 1/2” Tubing (Blue)
Emergency/Supply Air Line (IN): 1/2” Tubing (Red)
Emergency/Supply Air Line (OUT): 1/2” Tubing (Red)
Push/Pull Valve: Supply Line 3/8” Tubing (Red)
Reservoir Line 3/8” Tubing (Blue)
Delivery Line 3/8” Tubing (Black)
Air Tank: Supply Line 5/8” Tubing (Black)
Air Bags: Supply Line 3/8” Tubing (Red)
Leveling Valve: Supply Line 3/8” Tubing (Green)
Delivery Line 3/8” Tubing (Black)
Technical Information
Fifth Wheel Assembly
Haldex Modular Dolly System (HMDS)
Assembly
PAGE 2
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
Reservoir mounting depends
on Dolly Module location
Mount Dolly Module
as shown facing rear
Haldex Modular Dolly System (HMDS) with Brake Monitoring System (BMS)
Dolly ABS Module System: Height 15” x Length 20”
Weight: Less than 35 lbs.
Configuration: 2-Port ABS Relay valve - 2S/1M Single Axle
C-Channel Dimension Mounting: Approximate Height 5 1/4” x Width 3”
C-Channel Dimension (Option): Approximate Height 7 3/4” x Width 3”
Fittings: Push-To-Connect (PTC) Valves and Components
Panel Fasteners: Threaded Nuts 1/4-20 UNC and 5/16-18 UNC
Mounting Fasteners: 3/8”-16 UNC X 1 1/4” Long Hex Bolt
Nylon tubing (DOT): 1/4”, 3/8” and 1/2” Installed (5/8” tubing provided
by installer)
Included: Rubber Service Brake Hose clamp Assembly
NOTE: See L31250W Manual for Brake Monitoring System (BMS-1) Information.
Technical Information
PAGE 3
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
Haldex Modular Dolly System (HMDS)
Components - Front
ITCM Electronic
Control Unit (ECU)
ABS
Power
Emergency
Valve
Suspension
Dump Valve
2-Port ABS
Relay Valve
Service Pressure
Switch
Dolly Air
Module Panel
Booster
Valve
Manifold
One-Way
Check Valve
Quick Release
Valve
Supply Pressure
Switch
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 4
Haldex Modular Dolly System (HMDS)
Components - Rear
Pressure Protection Valve
(PPV) with One-way Check
Reservoir Purge
Valve (RPV)
Pressure Protection
Valve (PPV)
Supply to Height
Control Valve
Panel Hanger
(Used on 5 1/4”
C-Channel Only)
Brake Monitoring
System (BMS) Alarm
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 5
Haldex Modular Dolly System (HMDS)
Plumbing - Front Side
NOTE: To avoid damage to
power connector, use
provided zip tie in this
location to secure power
connection to ITCM ECU
Blue
(Out)
Blue
(In)
Red
(In)
Red
(Out)
3/8”
Tube
1/2”
Tube
1/2”
Tube
1/2”
Tube
3/8” Hose
(4 Places)
ABS Sensor (1A)
Road Side
ABS Sensor (1B)
Curb Side
ABS Power (In)
Service
Chambers
3/8” Hoses
1/2”
Tube
3/8”
Tube
3/8”
Tube
Pintle
Chamber
Suspension Air Bags
Leveling Valve
Delivery Port
Haldex Modular Dolly System (HMDS) -
Plumbing - Front Side
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 6
Haldex Push/Pull Valve Plumbing
WARNING: External connections, either tubing or electrical, MUST be made CORRECTLY for
proper function of the Haldex Modular Dolly System (HMDS). Failure to do so could result in
injury or death.
Air Reservoir
(1488 cu.in. min.)
5/8” Tubing
Single Axle
Reservoir
Delivery
Supply
All 3/8”
Tube
Haldex Push/Pull Valve
Leveling Valve
This connection MUST
be from the TOP or SIDE
of the reservoir.
3/8” Tubing
to RPV
From PPV (Supply Port)
Tee Fitting with a
Manual Drain Valve
Haldex Modular Dolly System (HMDS) -
Plumbing - Rear Side
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 7
Bendix®& Sealco®Push/Pull Valve Plumbing
Leveling Valve
WARNING: External connections, either tubing or electrical, MUST be made CORRECTLY for
proper function of the Haldex Modular Dolly System (HMDS). Failure to do so could result in
injury or death.
This connection MUST
be from the TOP or SIDE
of the reservoir.
Air Reservoir
(1488 cu.in. min.)
3/8” Tubing
to RPV
From PPV (Supply Port)
5/8” Tubing
Single Axle
Reservoir
Delivery
Supply
All 3/8”
Tube
Bendix & Sealco Push/Pull Valve
Tee Fitting with a
Manual Drain Valve
Haldex Modular Dolly System (HMDS) -
Mounting Brackets (5 1/4” - 7 3/4”)
Haldex Modular Trailer System (HMTS)
with Brake Monitoring System (BMS)
Installation/Service Guide (L31293W)
Haldex Modular Dolly System (HMDS) with Brake
Monitoring System (BMS) for Single Axle Dollies
Installation/Service Guide (L31298W)
PAGE 8
5 1/4” Channel Bracket
3/8-16 UNC X 1 1/4” Long Hex Bolt (Grade 5) 28-32 ft. lbs.
3/8” Flat Washer (6)
3/8” Lock Washer (6)
3/8” Nut (6)
7 3/4” Channel Bracket
3/8-16 UNC X 1 1/4” Long Hex Bolt (Grade 5) 28-32 ft. lbs.
3/8” Flat Washer (8)
3/8” Lock Washer (8)
3/8” Nut (8)
7 3/4” Bracket (2)
Intermediate
Bracket (2)
(8) Bolt
5 1/4” Bracket (2)
(6) Bolt
Hanger Bracket
Table of contents
Other Haldex Measuring Instrument manuals
