Air Weigh AW5800 Use and care manual

Model AW5800 On-Board Scales
TRACTOR SCALE SYSTEM
Self-Weighing Truck and Trailer Scales™
Installation, Calibration
and Operations Manual
Please Read Before Installing
PN: 901-0038-000 Rev14

2
Limited Warranty
For product failures due to material or manufacturing defects, Air-Weigh will
replace or repair all air suspension components for up to 3 years from shipment
date to the end-user Air-Weigh customer. These three-year components include:
Displays, ComLinks, Air Sensors, Power Cables, Air Sensor Assemblies, Air
Sensor Harnesses, and all other associated external components. Deflection
Sensors have a 1-year warranty. Air-Weigh assumes no responsibility for
administering warranty claims directly with any third party end users.
The responsibility of Air-Weigh under this warranty is limited to the repair,
replacement, or credit of the defective part or assembly.
This warranty does not cover incidental or consequential damage to persons or
property caused by use, abuse, misuse, or failure to comply with installation or
operating instructions. This limited warranty does not apply to any product that has
failed due to accident, abuse, alteration, installation not consistent with printed
installation instructions, improper maintenance, improper operation, or as a result
of system integration or installation not explicitly approved in writing by Air-Weigh.
Air-Weigh and its resellers shall have no responsibility or liability for damages if the
purchaser or any other person alters the vehicle incorporating Air-Weigh products.
This limited warranty shall not apply to any product that has been repaired or
altered by anyone not employed by Air-Weigh or not operated in accordance with
the manufacturer‘s printed material delivered with this product.
Air-Weigh hereby expressly disclaims any and all implied warranties of any type,
kind of nature whatsoever, particularly any implied warranty of merchantability or
fitness for a particular purpose not expressly stated by Air-Weigh in its printed
material delivered with its products.
Some states do not allow the exclusion or limitation of incidental or consequential
damages. If such laws apply, the limitations or exclusions contained in the terms
and conditions of this Warranty may not apply. This warranty gives you specific
legal rights and you may also have other rights, which vary state to state.
May be covered by U.S. Patent Nos. 4832141, 5478974, 5780782, Foreign Patent Nos. 623635, 1305191,
260494, 677998, 2122766, 625697
Copyright © 2004, 2006, 2007 by Hi-Tech Transport Electronics, Inc. All rights reserved. Air-Weigh®,
ComLink™, WireLink™, Weight Gauge™, and Hi-Tech Transport Electronics are registered trademarks of Hi-
Tech Transport Electronics, Incorporated. Other brand, product, or service names listed in this document are
the trademarks or registered trademarks of their respective holders. Information contained in this literature was
accurate at time of publication. Product changes may have been made after copyright dates that are not
reflected.
Part # 901-0032-000

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Procedure for Warranty Claims
1. In the event Air-Weigh requests to examine product prior to disposition,
OR for repairs or replacements, Air-Weigh requires a Return Material
Authorization (RMA) number to be issued before the item is returned.
Contact Customer Support Department at [phone] for an RMA
number. Please reference this RMA number in all correspondence.
2. Claimed items shall be shipped freight pre-paid to: Air-Weigh, Customer
Support Department, 1730 Willow Creek Circle, Eugene, Oregon 97402,
USA. The Air-Weigh RMA number shall appear on the outside of the
return packaging.
3. Air-Weigh shall examine returned material within 30 days after receipt, or
sooner if mutually agreed upon. If Air-Weigh determines that the part or
assembly was defective in material or workmanship and within the
warranty period, Air-Weigh will repair or replace the part or assembly and
return freight pre-paid. In the event Air-Weigh determines that the part or
assembly cannot be repaired or replaced and is within the warranty
period, a credit not to exceed the purchase price will be issued to the Air-
Weigh customer.
4. Air-Weigh Accounting will process a credit memo and notify the Air-
Weigh customer by email or fax. The Air-Weigh customer will process a
corresponding debit memo and notify Air-Weigh Accounting.
5. If the part or assembly received by Air-Weigh does not meet the
requirements of the warranty program set forth above, at the Air-Weigh
customer‘s request the part or assembly will either be discarded,
returned freight collect, or repaired or replaced at the Air-Weigh
customer‘s expense and returned freight collect.
1730 Willow Creek Circle • Eugene, Oregon 97402-9152 USA
P.O.Box 24308 • Eugene, Oregon 97402-0437 USA
Telephone [phone] • Order Desk [phone]
Customer Support [phone] • FAX [phone]
Hours of Operation: Mon-Fri, 7am –5pm, Pacific Time
www.Air-Weigh.com

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TABLE OF CONTENTS
TRACTOR SCALE KIT COMPONENTS 6
5800 TRACTOR SCALE SYSTEM OVERVIEW 8
INSTALLATION
Route Air Line from Suspension (Optional) 10
Installing Air Pressure Sensor(s) 11
Installing Deflection Sensors 11
Kit configuration Sensor Assignment 12
Cutting Hole In Dash and Mounting Weight Gauge 14
Connecting the ComLink Wiring Harness 14
Mount ComLink Behind Dash 15
Secure Cables and Air Lines. Re-assemble the Dash. 16
SCALE DISPLAY OVERVIEW 16
CALIBRATION 17
Preliminary Considerations 17
Calibrating the Tractor Scale Overview 19
Manual Calibration Procedure 20
Empty Weights 20
Heavy Weights 21
Calibration by Direct Entry of RATIO and OFFSET 22
Enter the Ratio and Offset 23
Adjust Weights Worksheet 24
Adjust Weights 24
OPERATIONS 25
FUNCTIONAL OPERATONS 26
HOW-TO-WEIGH Instructions 26
Creating a PIN# 26
Alarm Function 27
Alarm Function Programming Procedure 28
Alarm Weights 28
Turning On the Alarm Feature 28
Languages 29
Display Backlight and Set-Up 29

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QUICK REFERENCE MENU DIRECTORY 31
MENU OPERATIONS AND DEFINITIONS 32
Weight Display Overview 32
WEIGHTS 32
ALARMS 32
PRINT REPORT 32
CALIBRATION 33
SYS CONFIG 33
SET PIN# 33
DISPLY TYPE 33
SCALE TYPE 33
LBS/KGS 33
SHOW / HIDE 33
BACKLIGHT 33
MODEL NUMBER 33
DATA REPORT 33
SHOW GVW 34
SHOW STEER 34
SHOW HELP 34
SYSTM STATUS 34
ALRM WEIGHTS 34
TEST ALARM 34
A/D READINGS 35
CALIB DATA 35
COMLINK ID 35
SYSTEM TROUBLESHOOTING 35
INCORRECT WEIGHT READINGS 37
SUSPENSION TROUBLESHOOTING 37
MAINTENANCE 38
CUSTOMER SUPPORT 39
TRACTOR/TRAILER COMMUNICATION 40
INDEX OF APPLICATION NOTES 42

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AIR-WEIGH TRACTOR SCALE KIT
Tractor Scale Kit, AW5800,
Air Pressure Drive,
Calculated Steer, APP3
Includes all items listed
below:
Hardware Kit, AW5801,
Truck
PN 010-0063-000
Sensor Assembly, Air
Pressure, 5V, 1/4" Push-On
Brass Fitting
PN 010-9008-00x
x –denotes a variable
number
Cable, AW5800, Truck
Interface, ComLink, J1708
Display Private, 5'
PN 016-0500-020

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Cable, AW5801, Sensor, 3'
PN 014-xx00-012
x –denotes a variable
number
Card, Sensor Config,
AW5800, BOM level
PN 901-0039-000
Doc and Label Kit, AW5800
Truck
PN 901-0038-000
Tractor Scale Display,
AW5800
PN 050-5800-00x
x –denotes a variable
number
Tractor Scale ComLink,
AW5801
PN 050-5801-00x
x –denotes a variable
number

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OVERVIEW
Specifications
Display Scale
Length 2.44 inches, Width 2.44 inches, Height 3.10 inches
Weight: 3.6 oz.
Operating Temperature range –40° to 85°C (-40° to 185°F)
Input voltage: supplied by AW5801 Truck ComLink
Tractor ComLink
Length 2.84 inches, Width 5.2 inches, Height 1.12inches
Weight: 4.7 oz.
Operating Temperature range –40° to 85°C (-40° to 185°F)
Input voltage: 9.5V to 32V
Alarm output circuit limit : 1.0 amps
Weigh Reading Accuracy:
Axle with air sensor: +/- 300 lbs per axle group
Axle with Deflection Sensor: +/- 2% of Gross Vehicle Weight
AW5800 TRACTOR SCALE SYSTEM OVERVIEW
The AW5800 on-board scale converts tractor and trailer suspension loads
to an accurate on-ground weight. By comparing empty and loaded axle
group weights with empty and loaded suspension pressures, the scale
can be calibrated to display accurate weights for any air suspension load.
The scale will display the actual on-ground weight of each axle group to
within 300 pounds (140 kgs.) An axle group is defined by the Height
Control Valves (HCV), or leveling valves, on the air suspension. For
instance, a tandem drive axle suspension typically has only one HCV, so
the two drive axles are referred to as a single axle group and the weight
displayed will be for the total tandem weight.
The AW5800 scale display can show up to nine axle groups on one
tractor/trailer combination. Once the AW5800 is calibrated for weight, it is
not necessary to recalibrate unless the suspension characteristics
change. For details see ―Troubleshooting‖.

9
It is important to calibrate the scale system with the tractor
and trailer brakes released to release suspension binding.
Calibrating or observing weight readings with the brakes
engaged will result in inaccuracy.
Air-Weigh recommends calibration and weighing be
performed on a level surface with the vehicle adequately
chocked to prevent rolling.
When equipped with air-suspension dump valves, it is
recommended that the suspension be momentarily
exhausted (5-10 seconds of air dump is normally sufficient)
and re-inflated before calibrating or weighing. This will
improve repeatability and accuracy.
Any tractor equipped with an AW5800 Tractor Scale will automatically
display trailer weight data from Air-Weigh equipped trailers. No re-
calibration or trailer ID entry is required. No special tractor-trailer
connection is necessary, because trailer weight data is transmitted over
the vehicle‘s existing 7-wire cord (J-560) without any interference. This is
a true drop and hook application.

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INSTALLATION
Route Air Line from Suspension
(Optional; if Tractor Suspension gauge already exists in dash skip to
Installing Air Pressure Sensors)
1. Route a 1/4 inch air line from the airbag suspension to the dash.
2. Use a 1/4 inch brass street-T at the top of a convenient drive
axle suspension air bag to access air pressure. If you choose to
connect in the middle of an existing air line between air bags,
remove any paint on the air line and wipe clean before cutting
the air line.
NOTE: Avoid connecting on the supply side of the system.
3. Route the air line along other wire and air line harnesses into the
dash. Do not damage the air line.
Routing Air Line for 5850 –5856 Dedicated Tractor/Trailer Scale
(Optional: if Trailer Suspension gauge already exists in dash skip to
Installing Air Pressure Sensors)
1. Remove existing air line connection from one trailer air bag.
Install street –T (150-4081-000) into the airbag. Install fitting
(150-4083-000) into side of street-T and connect to air line
(380-0050-000). Reinstall original air line and fitting
connection to top of street-T.
2. Run air line to front of trailer. Secure with wire-ties.
3. Drill hole for trailer bulkhead fitting at a convenient point where
the existing airlines attach to trailer. Install bulkhead fitting (152-
0001-000). Connect air line to rear of bulkhead fitting with (150-
4083-000) brass fitting. Attach female coupling (150-4092-000)
to face of bulkhead fitting. This fitting MUST be connected to the
trailer to keep air in the suspension system.
4. Drill hole for tractor bulkhead fitting (152-0001-000) and mount
where existing air lines attach to tractor. Connect one end of the
coiled air line (380-0053-000) into face of bulkhead fitting.

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5. Install brass fitting (150-4083-000) into rear of bulkhead fitting.
Run air line (380-0050-000) from brass fitting in rear of tractor
bulkhead up into dash to within 3‘ of comlink location. Secure
with wire-ties.
6. Connect sensor assembly (reference Installing Air
Pressure Sensor(s), below) to end of air line in dash. Using
sensor cable, connect sensor to appropriate port in comlink
(Sensor B, or C if dual leveling valves).
7. Attach fitting (150-4091-000) to one end of coiled air line and
couple to fitting (150-4092-000) at front of trailer.
Installing Air Pressure Sensor(s)
Note: Avoid dropping the sensors, as this will cause them to fail
immediately or shorten the lifespan.
There are two methods of installing the sensor connectors to the
suspension air line under the dash; by T-ing off an existing
suspension air gauge line or by terminating the air line in the nickel
plated brass fitting supplied by Air-Weigh. Your Air-Weigh kit includes
2 different air line diameter selections –5/32‖, and 1/4‖.
To T-off the existing air line, additional fittings will need to be
purchased by the customer. Air-Weigh only supplies the
connectors needed for a terminated connection.
1. Connect the sensor to the fitting and tighten to about 25
foot-pounds torque.
2. Push the end of the air line(s) into the fitting and ensure it is
firmly secured.
NOTE: While the air line can be removed from the fitting by
retracting the o-ring while gently pulling the air line out,
repeated removal and replacement will weaken the seal.
Installing Deflection Sensor(s)
When installing kits with deflection sensors refer to manual 901-
0059-000 for instructions.

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TRACTOR KIT CONFIGURATION SENSOR ASSIGNMENT
Number
See Kit Part
Number for
Model Number
Sensor Installed
on this Suspension
Sensor Type
AP = Air Pressure Sensor
DS = Deflection Sensor
HY = Hydraulic Sensor
ComLink
Sensor
Cable Input
Jack
5800
Drive
AP
Sensor A
5801
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
5803
Drive, Hide Steer
AP
Sensor A
5805
Drive
AP
Sensor A
Steer
AP
Sensor B
5806
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Steer
AP
Sensor C
5807
Drive
AP
Sensor A
Steer
DS
Sensor B
5808
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Steer
DS
Sensor C
5814
Drive, Dual Deflection Sensors or other
dual sensors
DS
DS
Sensor A
Sensor B
Steer
DS
Sensor C
5815
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Steer, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor C
Sensor D
5817
Drive
DS
Sensor A
Steer
DS
Sensor B
5818
Drive, Dual Deflection Sensors or other
dual sensors
DS
DS
Sensor A
Sensor B
Steer, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor C
Sensor D
5820
Drive, Load Cell
LC
Sensor A
<not used>
N/A
Sensor B
Steer, Dual Deflection Sensors or other
dual sensors
DS
DS
Sensor C
Sensor D
5821
Drive
AP
Sensor A
<not used>
N/A
Sensor B
Steer, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor C
Sensor D
5822
DRIV 1 & DRIV 2
Drive
AP
Sensor A
Steer
DS
Sensor B
5823
DRIV 1 & DRIV 2
Drive, Dual Height Control
Valves or other dual sensors
AP
AP
Sensor A
Sensor B
Steer
DS
Sensor C
5824
Drive, Dual Deflection Sensors
or other dual sensors
DS
DS
Sensor A
Sensor B
Steer
AP
Sensor C
5825
Drive, Dual Height Control
Valves or other dual sensors
AP
AP
Sensor A
Sensor B
Steer, Dual Deflection Sensors or other
dual sensors
DS
DS
Sensor C
Sensor D
5826
DRIV 1 & DRIV 2
Drive
AP
Sensor A
Steer
AP
Sensor B
5827
DRIV 1 & DRIV 2
Drive, Dual Height Control
Valves or other dual sensors
AP
AP
Sensor A
Sensor B
Steer
AP
Sensor C

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DEDICATED TRAILER KIT CONFIGURATION SENSOR ASSIGNMENT
Model Number
See Kit Part
Number for
Model Number
Sensor Installed
on this Suspension
Sensor Type
AP = Air Pressure Sensor
DS = Deflection Sensor
HY = Hydraulic Sensor
ComLink
Sensor
Cable Input
Jack
5840
Drive
AP
Sensor A
Trailer
AP
Sensor B
Trailer –B-Train
AP
Sensor C
5841
Drive
AP
Sensor A
Trailer
AP
Sensor B
Trailer –B-Train
AP
Sensor C
5842
Drive
AP
Sensor A
Steer
AP
Sensor B
Trailer
AP
Sensor C
Trailer –B-Train
AP
Sensor D
5843
Drive
AP
Sensor A
Steer
AP
Sensor B
Trailer
AP
Sensor C
Trailer –B-Train
AP
Sensor D
5844
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Trailer
AP
Sensor C
Trailer –B-Train
AP
Sensor D
5845
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Trailer
AP
Sensor C
Trailer –B-Train
AP
Sensor D
5850
Drive
AP
Sensor A
Trailer
AP
Sensor B
5851
Drive
AP
Sensor A
Trailer
AP
Sensor B
5852
Drive
AP
Sensor A
Steer
AP
Sensor B
Trailer
AP
Sensor C
5853
Drive
AP
Sensor A
Steer
DS
Sensor B
Trailer
AP
Sensor C
5854
Drive, Dual Height Control
Valves or other dual sensors –
Hide Steer
AP
AP
Sensor A
Sensor B
Trailer
AP
Sensor C
5855
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Trailer
AP
Sensor C
5856
Drive, Dual Height Control Valves or other
dual sensors
AP
AP
Sensor A
Sensor B
Steer
AP
Sensor C
Trailer
AP
Sensor D
5858
Trailer Payload Hydraulic Ram
Trailer Payload Suspension
HY
AP
Sensor A or B
Sensor B or A

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Cutting 2-1/8-Inch Hole In Dash and Mounting the Display Gauge
1. Select a location for the scale on the dash panel with at least 3‖
clearance behind the dash for the unit and its connections. A
higher dash position provides better visibility.
2. Make a 2-1/8-inch (2.06‖) hole at that location. A hole template is
in the kit.
3. Remove the nuts at the back of the scale to release the
mounting bracket.
4. Position the display gauge in the hole so it appears level in the
dash.
5. Replace the mounting bracket on the back of the display, and
replace the bracket nuts. Tighten the nuts adequately to secure
the display (about 6 inch-pounds torque). Do not over tighten
the dash panel or the bracket nuts.
NOTE: Do not connect the wiring harness to the scale or
ComLink at this time.
Connecting The ComLink Wiring Harness
The ComLink wiring harness connects the Air-Weigh system to the
vehicle‘s power and ground circuits, the ComLink to the display gauge,
and the alarm output to a customer-provided warning device. Those
wires with connectors can only be connected to devices in one order,
because the connectors are all different. The blue and white wires also
need to be connected to power. The gray alarm wire is only connected to
a customer-provided warning device.
Power and Ground Table
1. Connect wiring harness power and ground to vehicle power and
ground circuits. See power and ground table above. Ignition hot
power from the fuse panel is ideal.
2. Connect the 8-pin plug of the wiring harness to the ComLink.
3. Connect the 2-pin plug and the 4-pin plug of the wiring harness
to the display gauge.
White wire
System common ground
Blue/Black wire with in-line fuse
12V or 24V ignition hot power
Gray wire
Alarm output (same voltage as
vehicle power)

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4. Connect the 4-pin sensor cable(s) to the ComLink Sensor Inputs
A, B, C, or D, as described in the System Description and Part
List that came with your Air-Weigh scale kit.
5. If you choose to connect an alarm, connect the alarm output wire
to any self-grounded alarm device (buzzer, horn, light, etc.).
6. Turn on key for system self-test. If system does not successfully
complete the self-test, see Troubleshooting Section at back of
this manual.
Mount ComLink Behind Dash
1. Select a location behind the dash for the Tractor ComLink,
ensuring adequate access to the scale, electrical connections,
and air lines.
2. The Tractor ComLink should be oriented with the connectors
facing downward, and may be installed by any of the following
methods:
a. Use wire ties through the holes in the ComLink‘s
mounting ears to secure it to any appropriate wire
harness behind the dash.
b. Find a flat location where ComLink can be attached
using the 2-sided adhesive tape already in position on
the back of the ComLink. Remove any dust, grease or
debris from the flat location. Remove one or both of the
red strips from the back of the ComLink, exposing a
powerful adhesive. Place the ComLink against the
cleaned flat area and push it hard enough to ensure
adhesion. For best results, push the Tractor ComLink
into place using 15 PSI or more, being careful not to
crack its case. Using this method will make it more
difficult to remove.
c. Use self-tapping screws or bolts through the mounting
holes.
Now that the ComLink has been mounted, once again turn on the key and
self-test the system.

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Secure Cables and Air Lines. Re-assemble the dash.
1. Excess wire and harness should be coiled and wire tied.
2. Wires, air lines, and sensor assemblies should be wire tied to
other secure harnesses to prevent damage due to vibration.
3. Re-assemble the dash.
4. Turn-on the key and perform a final system check. Note that the
scale will not display accurate weights until it has been
completely calibrated to a certified platform scale by entering
empty and loaded axle weights into the Air-Weigh scale.
Note: If your scale system includes the optional printer, the
printer cable is in two parts. One part connects to the Printer
Port on the ComLink and leads to a connector hole in the dash
(see Printer installation instructions in your Printer Kit package).
The other part of the cable connects from the printer to the dash
connector. This 2-part cable is so you can easily disconnect the
printer and store it in a clean, dry place when not in use.
Scale Display Overview
With the installation complete, the
next step in setting up your Air-
Weigh Tractor Scale is to
calibrate it. Before starting that
process it‘s a good idea to
become familiar with the Panel
Display on the front of your scale.
Below is a definition of what each
button is used for. The function
and use of these buttons remain
the same throughout all
operations of the scale.
Front Panel Buttons
1. ESC —press <ESC> to go to the menu system when displaying
weights, or to go to the previous menu selection when within the menu
system. Pressing <ESC> before pressing <ENTER> during data entry
will make the scale revert to its previous entry like an Undo function. Then
pressing <ESC> a second time will return to the previous menu selection.

17
2. ARROW UP —press <> to select a menu option immediately above
the flashing selection and to scroll the display to a higher number. Holding
<> increases the scrolling rate when entering numbers.
3. ARROW DOWN —press <> to select a menu option immediately
below the flashing selection and to scroll the display to a lower number.
Holding <> increases the scrolling rate when entering numbers.
4. ENTER —pressing <ENTER> selects the flashing menu item. It is also
used to enter weights during calibration.
CALIBRATION
There are two methods of calibrating the AW5800 Tractor Scale. The
traditional method is by entering the EMPTY weights into the scale
system when the vehicle is empty and entering the HEAVY weights into
the scale system when the vehicle is fully loaded. It‘s recommended to
have a full tank of fuel when calibrating weights to obtain the best drive
weight ratio. You can also calibrate Air-Weigh Trailer Scales in the same
manner by using the Tractor Scale keypad.
When selecting this calibration method it is imperative to enter empty
weights when the vehicle is empty and heavy weights when the vehicle is
loaded heavy. Failing to do so will result in inaccurate weight readings.
Alternatively, for those with identical suspensions and 5th wheel locations
on several vehicles, it may be more convenient to enter the RATIO and
OFFSET calibration data directly, if these are known. Use only one of
these methods to calibrate the scale.
Once calibrated, if a suspension‘s weight is always incorrect by the same
amount on the empty and heavy weights, it is easy to adjust the scale to
correct it by using the ADJUST function (See page 23).
Preliminary Considerations
The accuracy of the AW5800 Tractor Scale depends on the accuracy of
the certified scale used to calibrate or check-weigh. Ensure that the in-
ground scale is reliable, recently certified and in good repair. It is

18
preferable to obtain all weight tickets from the same certified scale. This
ensures comparative accuracy. Segmented scales, those that provide
individual axle group weights, are preferred. When segmented scales are
not available, take extra precaution in calculating weights.
For the best calibration results, the tractor and trailer should be:
Parked on level ground
Full tank of fuel
Tractor brakes released
Engine running
If possible, deflate the suspension for 5 to 10 seconds, and
then re-inflate to factory-specified ride height
Once the AW5800 Tractor Scale is calibrated, it is not necessary to re-
calibrate unless the suspension characteristics change.
Assigning a PIN number during the system set-up process will protect the
calibration procedure from tampering. Normally a PIN number is not
assigned until AFTER the scale has been calibrated. Air-Weigh Trailer
Scales also have a PIN lock-out to prevent tampering when the trailer is
parked, however any Air-Weigh equipped tractor will still have access to
the Trailer Scale‘s calibration function through the in-cab truck scale. See
page 26 for PIN # information.
5th Wheel Location Details
If your truck scale system uses the Air-Weigh "calculated steer weight"
method, the steer axle weight is determined by the amount of air pressure
in the drive suspension and the position of the 5th wheel. In that case, the
5th wheel must be in the same position to weigh as it was when
calibrated. The kit includes 5th wheel decals to remind the driver where
the calibration/weighing position is located.
The 5th wheel location affects the accuracy only of calculated steer axle
weights. The drive axle weights will always be accurate.
Once you have positioned the 5th wheel in the notch that is used most
often, apply these decals when you are about to calibrate the Air-Weigh
truck scale. Be sure the surface is clean and free of any grease, so the
decals will stick permanently.

19
One decal should be on the 5th wheel slider assembly and the other
should be on the frame mounting with the points of the triangles together
when calibrating and weighing.
Separate left and right side Height Control Valves
For tractor and trailer suspensions with dual Height Control Valves (air
suspension with both right and left height control valves on the same axle
group), tractor or trailer scale kits with dual sensor processors must be
specified when ordering.
Air-suspension Steer
For tractor suspensions that have an air-suspension steer, tractor kits with
a sensor for the steer suspension must be specified when ordering. These
kits do not use the ―calculated steer weight‖ method, and will be accurate
when the 5th wheel is moved. Single and dual Height Control Valve kits
are available.
CALIBRATING THE TRACTOR SCALE OVERVIEW
For Manual Calibration the EMPTY and HEAVY axle weights must be
entered by the user. When calibrating using this method the EMPTY
weights must be entered while the vehicle is empty, and the HEAVY
weights must be entered while the vehicle is fully loaded. Failure to
calibrate scales when vehicle is actually empty and when it has a true
heavy load will result in inaccurate weights. It is recommended that both
empty and full weights be taken on the same reliable, certified scale,
preferably a segmented scale that will provide axle weights. The order of
calibration —EMPTY or HEAVY —is not important; however, both
EMPTY and HEAVY must be properly entered before the weight display is
accurate. Once the calibration procedure is properly completed one time,
the EMPTY or HEAVY weights can be updated or re-calibrated
individually.
NOTE: Here’s a fast and easy way to calibrate a tractor scale.
With a fully loaded trailer, go to a reliable, certified scale and
weigh the steer axle and the drive axles separately. Move the
vehicle to a level spot close by where you can coast to a stop
without the brakes and not roll. Briefly exhaust the air
suspension for 5 or 10-seconds, and then re-inflate the
suspension to factory ride-height. Enter your heavy axle
weights into the Air-Weigh scale according to the calibration
procedure. Now, drop the trailer in a convenient spot and return

20
the bobtail tractor to the scale to re-weigh the steer and drive
axles. Return to your level parking spot, no brakes, re-inflate
the suspension, and then enter the empty axle weights into the
Air-Weigh scale.
Once you’ve entered both heavy and empty axle weights, the
scale should be displaying the actual on-the-ground weight to
within 300 lbs. Double check the loaded weights when you’ve
hooked up the trailer again.
Manual Calibration Procedure
NOTE: Remember, EMPTY or HEAVY weight calibrations can
be entered in any order, but the HEAVY weights must be
entered while the trailer is loaded, and the EMPTY weights must
be entered while the trailer is EMPTY. Additionally, the scale
must have both EMPTY and HEAVY weights entered before
calibration is complete and accurate weights are displayed.
CALIBRATING EMPTY WEIGHTS
1. Press <ESC> one or more times until the ―top menu‖ appears,
with VIEW WEIGHTS blinking.
2. Press the down arrow <> 2 times until PRINT, SETUP begins
blinking. Press <ENTER>.
3. Press the down arrow <> 1 time until SYSTEM SETUP begins
blinking. Press <ENTER>.
4. CALIBRATION is now blinking. Press <ENTER>.
5. Press the down arrow <> 1 time until MANUAL CALIB begins
blinking. Press <ENTER>.
6. EMPTY WEIGHT is now blinking. Press <ENTER>.
7. The screen pauses for three seconds with the display, ―ENTER
EMPTY –VEHICLE MUST BE EMPTY‖
8. The screen requests you to pick the axle suspension you wish to
calibrate (―PICK AXL‖). At first, STR(Steer) is blinking, and
DRV(Drive) is also shown. Other axle groups that may be shown
are LIFT, TRL(if only one trailer), TRLR A(Trailer A) and TRLR B
(Trailer B), TRLR C(Trailer C), TRLR D(Trailer D), TRLR
E(Trailer E), TRLR F(Trailer F) and TRLR G(Trailer G).
9. Use the down arrow <> to select the axle whose suspension
you wish to calibrate. When it is blinking, press <ENTER>.
If PIN is needed for access, enter it at this time.
(See page 26 for PIN setup instructions)