Air Weigh LoadMaxx Plus User manual

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PN 901-0171-000 R0
Air-Weigh Customer Support: 888-459-3247
LoadMaxx Plus &
QuickLoad Plus
Installation Guide
For Trailers with Mechanical
Suspensions

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Table of Contents
About the Air-Weigh Trailer Scale for Mechanical Suspensions.........1
Installation Overview..............................................................................1
Tools Required.......................................................................................2
Mounting the Scale...................................................................................3
Mounting Flush to the Trailer.................................................................4
Mounting with a Van or a Frame Rail Bracket.......................................5
Connecting Power to the Scale...............................................................6
Power Cable Installation Guide.............................................................6
Connecting Power with the ABS Connector..........................................7
Connecting Power to the Junction Box..................................................8
Alarm Installation......................................................................................8
Welding the Deection Sensor Brackets...............................................9
Installing the Deection Sensors..........................................................11
Routing the Sensor Extension Cables.................................................12
Setting the A/D Values.........................................................................12
Reading and Adjusting the A/D Values...................................................13
Adjusting the A/D Readings.................................................14
Final Sensor Torque..............................................................15
Limited Warranty.....................................................................................16
Procedure for Warranty Claims.............................................................17

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Trailer Overview
Air-Weigh Trailer Scales for mechanical suspensions accurately
measures real-time, on-the-ground weights. The leaf spring scale is
currently designed for tandem and tri-axle trailers.
The LoadMaxx Plus version enables drivers to view steer, drive, trailer,
GVW, and net payload on any LoadMaxx equipped tractor.
Air-Weigh App
Download the Air-Weigh app and view weight data on any smart
device. Available for download in the Apple and Android app stores.
Installation Overview
There are ve major components of the scale that you will install:
• Trailer scale display
• Power interface and extension cables
• Sensor interface and extension cables
• Deection sensors x2
• Brackets x2
Note: When installing this kit on a three axle trailer, the rst sensor is
to be installed on the forward facing side of the center axle and the
second sensor is to be installed on the forward facing side of the rear
axle.
Before calibrating, note that there is a required break-in period of
100 miles. First verify that your A/D readings are set in the required
range. See Setting the A/D Values, starting on page 14, for more
information.

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Tools Required
You will need the following tools to install the trailer scale and
deection sensors:
• Standard wrench set or adjustable wrench
• Drill with ¼-inch drill bit, or larger if ush mounted
• Flush wire cutter
• Needle nose pliers
• Grinder
• Chalk or permanent marker
• MIG or ARC welder
• Torque wrench
• 22mm socket
• Enamel spray paint, any color
• Tape measure
• C-clamps (2)
Optional Tool
• Deection sensor test box, p/n 1001
Note: Use the bracket template that has been provided with your
trailer kit and follow directions on the template to double check that
the bracket will t.
Note: Bracket is installed on the front and rear axles for tandem
trailers and on the center and rear axles for tri-axle trailers.

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Mounting the Scale
There are three ways you can mount the trailer scale:
• Flush mounted to the trailer frame itself
• Using a Van bracket
• Using a Frame Rail bracket
Flush Mount Van Bracket Frame Rail Bracket
Choose the mounting method that will work the best for your trailer
conguration. Air-Weigh recommends that you mount it on the
driver’s side, 10 feet ahead of the front axle. Mount the trailer
scale in a position that is easy to view and is protected from direct
tire spray and road debris. In regions where severe weather is a
consideration, contact Air-Weigh for more information on protective
enclosures.
Note: When choosing a location to mount the scale display, rst
consider the length of cables in your scale kit. Make sure there is
enough length in your power and sensor cables to run from where
you are mounting the display to where you are connecting to power
and installing the brackets and deection sensors.
Note about cables: Do not place strain on the cables. If there is a
sharp bend in the wires, the environmental seal could fail, allowing
water to damage the scale. If the scale is disconnected from the
trailer, the power cable and air line will not support the weight of the
scale.

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Mounting Flush to the Trailer
A ush mounted scale is mounted directly to the side of the trailer.
1. Determine the best location to mount the scale. This should
be a at area of the trailer, thin enough to make drilling
possible and accessible from both front and back. Make sure
the back side of the location is free of obstacles and debris
that would interfere with the installation.
2. Use the supplied template or hold the scale in the location
you will mount it for reference and cut a hole large enough to
t the port connections on the back.
3. Mark the trailer surface that touches each of the screw holes
on the sides of the scale.
At this point, determine whether you want to connect the power
to the display before or after you secure it to the trailer. If after,
proceed to step 6 before completing steps 4 and 5.
4. Feed the power cables to the back of the trailer display from
below the edge of the trailer or through the previously cut
hole.
5. Plug the power interface cable into Port 1 on the back of the
scale display.
6. Place the scale over the space you have prepared on the
trailer, making sure port holes t the hole on the trailer. Use
the provided bolts, rubber washers (one for each front and
back of the scale), and nuts to secure the scale to the side of
the trailer.
7. Apply the provided blue Loctite to all threaded bolts to
prevent bolts from backing out.
Note: The provided rubber washers are
required to dampen the vibration.
Note: Do not overtighten mounting bolts.
Torque to 10 inch lbs or 1.1 Nm.

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1. Determine the best location to mount the scale. For the Van
Bracket, the bracket screws should be mounted on a ledge,
and the scale itself should hang o󰀨 the ledge with no obstacles
blocking it. For the Frame Rail Bracket, it should be visible while
loading and in a protected area from direct tire spray.
2. Hold the bracket in the location you will mount it. Mark the trailer
surface that is visible through the holes in the top of the bracket
using a permanent marker.
3. Using the marked areas as a guide, drill two 1/4-inch holes into the
surface of the trailer.
4. Secure the scale to the bracket by using the provided bolts and
rubber washers. Insert one bolt and washer on each side of the
scale through each of the scale wing holes and tighten.
5. Apply provided blue Loctite on threaded bolts.
At this point, determine whether you want to connect the power to the
display before or after you secure the bracket to the trailer. If after,
proceed to step 8 before completing steps 6 and 7.
6. Feed the power cables to the back of the trailer display.
7. Plug the power interface cable into Port 1 on the back of the scale.
8. Secure the bracket to the trailer surface. To prevent the bolts from
backing out, apply the provided blue Loctite to all threaded bolts
before placing through bracket and securing to the trailer.
Do not overtighten mounting bolts. Torque to 6 inch lbs or .68 Nm.
Mounting with a Van or a Frame Rail Bracket
Van Mounting Bracket Frame Rail Mounting Bracket

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C
Connecting Power to the Scale
You can connect the trailer scale to the trailer’s power either through
the ABS brake harness, through the junction box, or directly through the
lighting harness. All methods are equally e󰀨ective regardless of your
trailer setup; choose the method that is most convenient.
Note: If using lighting harness for power, the lights need to be on in order
for the trailer scale to have power.
Power Cable Installation Guide
1. Scale Display
E
CD
Blunt Cut
2. Interface Cable
4. ABS-T Breakout
3. Power Cable
Connection order
1. Plug interface cable (A) into Scale Display Port 1
2. Plug interface cable (B) to Power Cable (C)
3. Plug Power Cable (D) into ABS T-Breakout (E) or wire Blunt cut end
to junction box or lighting harness
Port 1 B
A
or

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Connecting Power with the ABS Connector
North American trailer manufacturers use one of two standard connectors
to connect the trailer’s wiring harness to the ABS brake system: USA
Brand, which uses a 6-pin plug, or Sealco, which uses a 5-pin plug.
Air-Weigh provides T-breakout connectors that do not require splicing or
soldering and do not interrupt power to the ABS system for each of these
connector types.
1. Locate the ABS system harness. Trace the harness to the breakout
connection.
2. Disconnect the 5- or 6-pin breakout connection.
3. Connect the supplied ABS T-breakout connector to both ends of
the ABS harness breakout. Make sure the locking tabs are locked
securely. If you are using the USA connector, make sure all pins
are properly aligned and the white plug is rmly seated in its locking
hole. Failure to do so will cause faults in your ABS system.
4. Connect the scale’s power extension cable to the T-breakout
connector.
5. Route the power extension cable along the frame of the trailer
toward the location where the scale is installed. If possible,
route along an existing wiring harness. If the trailer has a sliding
suspension you must use an existing wiring harness or umbilical to
avoid damaging or breaking the cable.
6. Secure the cable loosely to the frame using zip ties.
7. Connect the end of the power extension cable to the power
interface cable. Make sure the cable is under no strain and is not
bend.
Connecting the T-Breakout to the Power Cable

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Connecting Power to a Junction Box
1. Starting at the 7-way connector at the front of the trailer, follow the
wiring harness until you reach/nd the junction box. Remove the
cover of the junction box to expose the wiring. Find the blue ABS
power wire.
2. Using the supplied ring terminals, connect the blue power wire on
the end of the trailer scale power cable to the blue ABS wire in the
junction box. Connect the white ground wire on the end of the scale
power cable to the white ground wire in the junction box.
3. Route the power extension cable along the frame of the trailer
toward the location where the scale is installed. If possible,
route along an existing wiring harness. If the trailer has a sliding
suspension you must use an existing wiring harness or umbilical to
avoid damaging or breaking the cable.
4. Secure the cable loosely to the frame using zip ties.
5. Connect the end of the power extension cable to the power interface
cable. Make sure the cable is under no strain and is not bent.
Alarm Installation
Insert the Alarm cable into Port 2 on the back
of the scale. The gray, sealed wire from the
main wiring harness is the alarm circuit output.
It can be connected to any self-grounded
alarm device with a current draw of 1.0 amps
or less. The alarm voltage will be the same as the vehicle output voltage.
You must install a relay for any device that draws more than 1.0 amps. Do
not disturb the sealed end of the wire if alarm is not installed.
When using an alarm, connect the alarm output wire and the ground
return wire to the desired device. Ensure that any unused alarm wires are
electrically insulated.