Frequently Asked Questions

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Trailer Axles
Trailer Brakes
Tire and Wheels
Tarp Systems
Suspension
7 Way Wiring
4 Way Wiring
Trailer Axles
How to Measure Axles Hub Face and Spring Center for my Trailer?

There are a few measurements that you need to be aware of regarding any trailer. To get the measurement, it's easiest if you remove your tires and wheels, or measure center of tire to center of tire. It can also be helpful to have a friend hold one side of the tape measure, but it’s not absolutely necessary.

Hub Face Measurement:


To obtain the hub face measurement, first hook your tape measure to the outside of the hub, (the part of the hub facing the wheel). Measure across the axle to the exact same spot on the opposite side. Be careful not to measure to the inside of the hub, only the outside. This is the primary measurement that is needed. The rest of the measurements below are alternative measurements that can be used to arrive at this measurement. 

Spring Center Measurement:


This measurement is critical. If the springs are misplaced due to bad measurement, you can end up bending the axles. This one is difficult to do alone. Have a friend hold the end of the tape measure right in the middle of one of the springs, while you extend to the center of the opposite spring. If taking the measurements on your own, then you can cheat by first hooking the tape measure on the outside of one spring and then extending it to the inside of the opposite spring.

 

What are the Overhang restrictions on torsion axles?
Yes, there are overhang restrictions that apply to torsion trailer axles.
Below there is a chart with the Axle Capacity, Minimum and maximum overhang restrictions. 
What is the difference between Under slung and Over slung?

The axle position in relation to the spring needs to be considered before building. The options are "overslung". where the spring is mounted over the axle, or "underslung" where the spring is mounted under the axle.

There is no advantage to either system in regards to trailer strength or ride, but does affect the height of the chassis/tongue above the road and depending on the load can aid or hinder trailer stability.

 

How do I purchase the correct trailer hub/drum?

Purchasing the correct hub or drum is an important step in repairing your trailer axle.

There is simple and easy to follow steps to make sure you are getting the correct hub.

Step 1: Remove your hub or drum from your trailer axle.

Step 2: Measure your bolt pattern to identify what capacity your axle is, if it is unknown. Please see the following diagram to determine your bolt pattern.

 


Step 3: Now, you can also remove the front and rear bearings and seal. Once you remove the bearings, you will be able to read the number off the back of the bearings that correspond with a correct spindle size. If this number is not readable, you will be able to measure the inside dimensions of the bearing and seal in order to determine which one you need. Please see the attached pictures on how to do so.

 

 



Step 4: Pick the best hub or drum for your needs. If you are unsure, we would be happy to assist you in making the correct decision.

How should I do maintenance on my Dexter Trailer Axle?

Follow this maintenance schedule to keep your Dexter axle operating at its best. It’s fairly simple to read. The left-most column has a list of maintenance items. Next comes the manner of maintenance required. After that, there’s a grid showing the frequency of how often you should do this. We recommend keeping a dedicated notebook or spreadsheet that tells you the last time you did each step. 

 

What is the minimum and maximum measurements possible for a custom axle?

Use this chart to tell you the minimum and maximum measurements your custom axle might possibly have. Find the type of axle you have in the left-most column, and follow the measurements from there. 



 

How to Measure Axles Hub Face and Spring Center for my Trailer?

There are a few measurements that you need to be aware of regarding any trailer. To get the measurement, it's easiest if you remove your tires and wheels, or measure center of tire to center of tire. It can also be helpful to have a friend hold one side of the tape measure, but it’s not absolutely necessary.

Hub Face Measurement:


To obtain the hub face measurement, first hook your tape measure to the outside of the hub, (the part of the hub facing the wheel). Measure across the axle to the exact same spot on the opposite side. Be careful not to measure to the inside of the hub, only the outside. This is the primary measurement that is needed. The rest of the measurements below are alternative measurements that can be used to arrive at this measurement. 

Spring Center Measurement:


This measurement is critical. If the springs are misplaced due to bad measurement, you can end up bending the axles. This one is difficult to do alone. Have a friend hold the end of the tape measure right in the middle of one of the springs, while you extend to the center of the opposite spring. If taking the measurements on your own, then you can cheat by first hooking the tape measure on the outside of one spring and then extending it to the inside of the opposite spring.

 

What are the Overhang restrictions on torsion axles?
Yes, there are overhang restrictions that apply to torsion trailer axles.
Below there is a chart with the Axle Capacity, Minimum and maximum overhang restrictions. 
What is the difference between Under slung and Over slung?

The axle position in relation to the spring needs to be considered before building. The options are "overslung". where the spring is mounted over the axle, or "underslung" where the spring is mounted under the axle.

There is no advantage to either system in regards to trailer strength or ride, but does affect the height of the chassis/tongue above the road and depending on the load can aid or hinder trailer stability.

 

How do I purchase the correct trailer hub/drum?

Purchasing the correct hub or drum is an important step in repairing your trailer axle.

There is simple and easy to follow steps to make sure you are getting the correct hub.

Step 1: Remove your hub or drum from your trailer axle.

Step 2: Measure your bolt pattern to identify what capacity your axle is, if it is unknown. Please see the following diagram to determine your bolt pattern.

 


Step 3: Now, you can also remove the front and rear bearings and seal. Once you remove the bearings, you will be able to read the number off the back of the bearings that correspond with a correct spindle size. If this number is not readable, you will be able to measure the inside dimensions of the bearing and seal in order to determine which one you need. Please see the attached pictures on how to do so.

 

 



Step 4: Pick the best hub or drum for your needs. If you are unsure, we would be happy to assist you in making the correct decision.

How should I do maintenance on my Dexter Trailer Axle?

Follow this maintenance schedule to keep your Dexter axle operating at its best. It’s fairly simple to read. The left-most column has a list of maintenance items. Next comes the manner of maintenance required. After that, there’s a grid showing the frequency of how often you should do this. We recommend keeping a dedicated notebook or spreadsheet that tells you the last time you did each step. 

 

What is the minimum and maximum measurements possible for a custom axle?

Use this chart to tell you the minimum and maximum measurements your custom axle might possibly have. Find the type of axle you have in the left-most column, and follow the measurements from there. 



 

I currently have a hydraulic brake axle set up. Can I easily switch over to an electric brake axle set up?
Of course you can! All you have to do is purchase the electric brake axles. Once you have your axles, you will cut the wires to the hydraulic pump, and from those wires you will connect the brake power wire and the ground wire to the electric brake axles (generally black, which is the power wire, and white, which is the ground wire).
How do I Troubleshooting Trailer Brakes?

Trouble shooting trailer brakes is all about following a list of fixes based on the symptoms your brakes are exhibiting. For example, your brakes might pull to one side, sound too harsh, or be too noisy. In general, five different things might cause any one of those problems. Your job is to work through those five fixes until you get to your solution. Use this flowchart to guide the steps you take.


How do I properly use my trailer brakes?

Trailer brakes are designed to work in synchronization with the brakes on your tow vehicle. never use your town vehicle or trailer brakes alone to stop the combined load.

Brake controllers must be set up according to the recommendtion of the manufacturer to ensure proper synchronization between the two vehicle and your trailer. Depending on your set up, you may need to make small brake adjustments to accomodate changing loads and different driving conditions.

Proper synchronization of tow vehicle to trailer braking can only be accomplished by road testing. Brake lockup, grabbiness, or harshness is quite often due to the lack of synchronization between the vehicle and the trailer being towed, too high of a threshold voltage (over 2 volts), or under adjusted brakes.

Before any synchronization adjustments are made, your trailer brakes should be burnished-in by applying the brakes 20-30 times with approximately a 20 m.p.h. decrease in speed, ex: 40 m.p.h. to 20 m.p.h. Allow ample time for brakes to cool between application. This allows the brake shoes and magnets to slightly "wear-in" to the drum surfaces.

 

 

 

How do I order the correct wheel? Does my wheel have an offset?

 

What are the Trailer Tire and Wheel Torque Specifications?

Please use the following charts to help you determine the proper torque for your equipment. Please note that over-torquing can cause the bolt to be prone to cracking, shearing, loosening, or breaking off, which can result in damage to the wheel and other related components

To determine the proper torque for your wheel, use the chart listed below.

 

 

When tightening your lug nuts, please keep in mind to follow the proper sequence to insure proper installation. After installation, remember to check the torque after the first 10 miles, 25 miles, and again at 50 miles of driving. Check periodically thereafter.

 

U-Bolts

When determining what torque your U-bolt will need, first determine the diameter (measurement A). When you determine the diameter, please use the chart below for the appropriate torque.

 

 

Spindle Nut

When tightening your spindle nut, it is best to tighten the nut until snug, where it has no type of play on it and then back off of it slightly (about an 1/8th of a turn). If your axle has castle nuts and cotter pins or a tang nut on the spindle, tighten them by hand until it stops, then back it off so the cotter pin or washer tang fits into the indentation of the castle nut.

 

Why should you test your motor?

When your tarp system is not running – the motor will not activate – it is regularly assumed the motor has failed. But there can be many causes – such as the relay, circuit breaker, a pinched wire or loose connection. 

Before You Begin

  • Ensure that the tarp system components are grounded to battery negative when in use.

  • Do NOT ground to truck frame

  • A normal amperage reading is anywhere between 10-15 Amps for a US Tarp motor when unloaded (shaft is not driving the axle)

  • Ensure that the 12V battery being used to test the motor is fully charged

  • Do not touch leads together when testing the motor

    List of Materials needed:

    Tarp Motor to Test, 12v Battery (must supply at least 12 Volts), Jumper Cables or Set of Wires Equal to or Larger than 6ga Wire, Ring Terminals or Cable Clamps (if needed)

     

    Step 1: Remove the motor cover and existing motor wires. Fix cable clamps from jumper cables to motor terminals

    Step 2:Touch one wire to battery ground and the other wire to battery positive

    Step 3:If motor does not operate, it may need to be replaced or returned. If the motor works, continue

    Step 4: Swap the cable on the battery to test the reverse direction of the motor

    Step 5: If the motor does not operate, replace or check if your motor qualifies for warranty. If the motor works, there is potentially another problem with the tarp system

    *Note: Ensure that the tarp system is grounded to battery neutral and NOT to the truck frame.



    Using a clamp ammeter, read the amperage on the battery positive cable while the motor is operating unloaded. Brand new US Tarp motors typically pull 10-15 amps unloaded. If the motor is pulling over 25 amps unloaded, replace or check if your motor qualifies for warranty.

    *Note: Typically, clamp ammeters are not very consistent with readings precise VDC amperage. This test is meant to give you an idea on the condition of your tarp motor.



How do I wire my rotary switch?

Use this diagram to wire your rotary switch. If you feel your setup is different or if you need help with the diagram, feel free to give us a call. 936-349-6507



What is the Hanger Spacing for a 7K Slipper Spring Setup? What is the position of the Hangers?



When selecting a tandem axle slipper suspension for your trailer, there are several important measurements to consider. These include:

  1. Distance between front and center hangers: This is the distance between the front hanger and the center hanger of the suspension system. This measurement will vary depending on the specific slipper spring you are using, so be sure to consult the manufacturer's specifications.

  2. Distance between center and rear hangers: This is the distance between the center hanger and the rear hanger of the suspension system. Again, this measurement will vary depending on the specific slipper spring you are using.

  3. Distance between U-bolts: This is the distance between the two U-bolts that secure the suspension to the axle. This measurement will also vary depending on the specific slipper spring you are using.

  4. Distance between the center of the axle and the trailer frame: This is the distance between the center of the axle and the trailer frame. This measurement is important because it affects the ride height of the trailer.

  5. Axle diameter: This is the diameter of the trailer axle. It's important to ensure that the slipper suspension you select is compatible with the diameter of your axle.

By considering these measurements and ensuring that they are compatible with the specific slipper suspension you are considering, you can help ensure that your trailer will ride smoothly and safely.

 
What are Shackle Straps Used For?

These magical straps are the key to distributing weight evenly across both axles of your trailer. By connecting the leaf springs to the equalizer, Shackle Straps ensure that your trailer stays stable and doesn't sway like a hula dancer in a hurricane.And it's not just about stability - Shackle Straps also help to protect your suspension components from unnecessary wear and tear. Think of them as the shock absorbers of the trailer world - they soak up all the bumps and bruises so that your precious cargo doesn't have to.

 

Shackle Straps, also known as shackle links, are an important component of tandem axle trailer suspension systems. Here's how they work and how to install them:

First, let's talk about how they work. Shackle Straps are essentially small metal brackets that connect the leaf springs of your trailer to the equalizer, which is a metal bar that runs between the axles. The shackle link allows the leaf spring to flex and move as the trailer goes over bumps, while still keeping the axle and the frame of the trailer in proper alignment.

To install Shackle Straps on your trailer, you'll need to follow these simple steps:

  1. Jack up the trailer and the axle then remove the wheels.
  2. Locate the leaf springs and the equalizer bar.
  3. Remove the old shackle links, if applicable.
  4. Position the new shackle links in place, making sure they are the correct size for your trailer.
  5. Tighten the bolts on the shackle links until they are snug, but not overly tight. You don't want to deform the leaf springs or damage the shackle links.
  6. Reinstall the wheels and lower the trailer back to the ground.
  7. Check the shackle links and make sure they are properly aligned and tightened before hitting the road.

That's it! Installing Shackle Straps is a simple and straightforward process, but it can make a big difference in the performance and longevity of your trailer. So don't skimp on this important component - make sure your Shackle Straps are in good shape and properly installed before your next adventure on the road.
Single Axle 2K-Triple Axle 8K Hanger Spacing Diagrams

Below: 3500lb - 8000 lb Tandem Axle Hanger Placement 2" Springs



Below: 2000lb -7000 lb Tandem Axle Hanger Placement 1 3/4" Springs



Below: 2000 lb - 7000 lb Single Axle Hanger Placement 1 3/4" Springs



Below: 2000lb - 7000 lb Triple Axle Hanger Placement

What is a 7-way wiring diagram for a trailer?
A 7-way wiring diagram illustrates the configuration and connections of wires in a trailer's 7-way connector, typically used for towing. It includes connections for features like tail lights, brake lights, turn signals, and ground, with an optional wire for reverse lights or additional functions.

Can I use a 6-way wire for a 7-way trailer connection?
Yes, a 6-way wire can be used for a 7-way trailer connection. The 6 wires will cover essential functions such as ground, tail lights, brake lights, left and right turn signals, and an auxiliary function. The 7th wire, often used for reverse lights, is optional and can be added if needed.

How do I add a 7th wire for reverse lights?
To add a 7th wire for reverse lights, connect an additional wire from the reverse light circuit of the towing vehicle to the corresponding pin in the 7-way connector. This requires an understanding of both the towing vehicle's wiring system and the trailer’s connector setup.

What should I do if my trailer lights are not working properly?
Check the connections to ensure the wiring matches the correct pin functions on both the trailer and towing vehicle. Inspect the wires for damage and verify the ground connection is secure. If problems continue, consider a professional inspection.
Is it legal to tow without a functioning reverse light?
Legal requirements for reverse lights vary by location. While not always mandatory, they are recommended for safety. Always check local regulations to ensure compliance.
How can I ensure my 7-way wiring is safe and reliable?
Regular inspections of the wiring and connectors are crucial. Look for signs of wear, corrosion, or damage. Ensure all connections are secure and properly insulated. If in doubt, have the wiring checked by a professional for peace of mind.
What is a 4-way wiring diagram for a trailer?
A 4-way wiring diagram for a trailer displays the connections for a basic lighting system, which typically includes tail lights, brake lights, and left and right turn signals. This setup is the most basic form of trailer wiring and is commonly used on small trailers.

What are the typical wire colors and functions in a 4-way wiring setup?
In a 4-way connector, the standard color coding typically includes: White for Ground, Brown for Tail/Running Lights, Yellow for Left Turn Signal and Brake Light, and Green for Right Turn Signal and Brake Light.

How do I install a 4-way connector on my trailer?
To install a 4-way connector, align the trailer's wires with the corresponding wires of the connector based on their function and color. Ensure all connections are secure, using appropriate connectors, and properly attach the ground wire (usually white) to the trailer frame.
What should I do if my trailer lights are not working with a 4-way connector?
Check the connections for security and correct color/function matching. Inspect the wires for damage. The ground connection is crucial, so ensure it's well-established. If lights still don't work, a professional inspection may be necessary.
Is a 4-way connector suitable for all types of trailers?
A 4-way connector is appropriate for trailers requiring only basic lighting functions. For trailers with advanced features like electric brakes or additional auxiliary functions, a connector with more pins, such as a 7-way connector, would be more appropriate.
How do I troubleshoot a 4-way wiring setup?
Utilize a circuit tester to check each wire's functionality. Confirm a solid ground connection and look for shorts or open circuits in the wiring. If a specific light isn't working, test both the trailer and the towing vehicle side of the connector.
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