Frequently Asked Questions

General Questions:

Q. What is a TrestleJack?

A. Whenever you need to change a tire or repair brake linings or bearings on a heavy load trailer, you can rely on the TrestleJack TJ470 or the TJ515 unit to cut downtime dramatically. It lifts a trailer axle faster than any conventional system - in fact, the entire process can be achieved in less than 10 seconds.

The TrestleJack uses driving motion from the tractor to lift and lower trailer axles. Because nobody is allowed close to or underneath the trailer for the lifting and lowering procedures, the result is a far safer working environment. Once the TrestleJack is upright, it transforms into an axle support stand with a safe working load of 30 tons. Where a complete axle or empty trailer needs to be lifted, you will need to use two TrestleJacks per axle.

Q. Which trailers are supported by TrestleJacks?

A. TrestleJacks are designed to work on most commercial and recreational trailers.

Our large jacks  - TJ470 fit most trailers with R22.5 - 30 Ton

                             TJ515 fits most trailers with R24.5 - 30 Ton

Flat Bed Trailers

Dry Van and Enclosed Trailers

Refrigerated Trailers and Reefers

Step Deck Trailers – Single Drop Trailers

Extendable Flatbed Stretch Trailers

Stretch Single Drop Deck Trailers

Extendable Double Drop Trailers

RGN or Removable Gooseneck Trailers

Our small Jack - TJ220ADJ fits any recreational trailer with tires ranging from 12" to 16"

 

Q. Does TrestleJacks work with trailers fitted with Round or Square Axles?

A. Yes, both axle types are supported. 

Q. How safe is it to use TrestleJacks?

Before using TrestleJacks it is the operator’s responsibility to ensure that they are familiar with the content found in the standard operating procedure and that it is understood and followed appropriately.

A. TrestleJacks is the safest lifting and standing device currently available on the market. During the lifting and lowering process, no person is allowed close to or underneath the trailer. The driver is kept safe in the cab during the process.

In the upright position, the TrestleJack is a safe axle standing, supporting or blocking device. The cup’s position of five degrees over the top dead center ensures that no rolling forward can occur without applying significant force. In the event where a tire needs to be changed on a sloped surface, a chock block can also be placed in front of the TrestleJack.

TrestleJacks are load tested with a safe working load of 30 Tons. A load certificate valid for 1-year, a risk assessment, and standard operating procedure is also made available to help users familiarize themselves with the use of the product. Online training videos are also provided to TrestleJacks clients.

Q. Can I use TrestleJacks in a roadside breakdown?

A. Yes. TrestleJacks have been tested in mud, on a dirt road, paving & tar roads. Both empty and loaded trailers have been tested. As with any lifting or standing device, an even and hard surface needs to be identified to lift and support axles. Please ensure that the operator is familiar with the content in the standard operating procedure available on the website.

Q. Will the TrestleJacks slip when I drive onto it?

A. TrestleJacks have been designed to work on most surfaces. Placing the TrestleJack close to the spring blades or airbag mounting point ensures that no slipping could occur.  

Q. How much does a TrestleJack Weigh?

A. TJ515 - 65lb

     TJ470- 63lb

     Tj220ADJ - 13.5lb

Q. Do I need to use two TrestleJacks per axle?

A. Only when lifting entire axle will two TrestleJacks be required. In the event where an entire trailer needs to be lifted, please ensure that the trailer is without a load.

Q. Can I lift two or more sides of a trailer when rotating tires?

A. Yes. TrestleJacks can be placed on the same side or opposite sides and lifted at the same time to be able to rotate tires. When lifting an entire axle, two TrestleJacks will be required.

Q. Can the TrestleJack damage the trailer’s axles or slag adjusters?

A. TrestleJacks are constructed of mild steel. Trailer axles are built with a harder steel. The result is that the TrestleJack cup will wear away rather than causing any damage to the trailer axle. The TrestleJack's design prevents any contact with the slag adjusters found on trailers. On most trailers, it is best to place the TrestleJack in the loading position on the side of the axle where there is no slag adjuster.

Q. Will TrestleJacks work on trailers fitted with airbag suspension?

A. Yes. In all our tests with trailers fitted with airbags, TrestleJacks did not get in the way or came close to them. No damage was made. 

Q. Are hydraulic jacks cheaper than TrestleJacks?

A. 30 Ton hydraulic jacks have a wide range of pricing in the market today, on average a 30-ton hydraulic jack cost is ~$450.00 - But then you still need a trestle to secure the axel as the hydraulic jack cannot be used as a jack but a lifting tool. The TrestleJack does both faster and safer.

Hydraulic Jack Overview:

Since 1855, before the heavy commercial trucking industry, as we know it started, people mainly used the hydraulic jack for lifting vehicle axles. The hydraulic jack is a product that was designed for a general purpose and normally supplied with the tractor. The tractor supplier is not aware of the type of trailer that will be used and tractors are also not limited to specific trailer types. 

Hydraulic Jack Safety:

As per the user guide of a hydraulic jack, it clearly states that the device is made for lifting a load and not holding it. It specifically states that an axle support stand must be used before any work can be started. Many operators ignore this fact and are introducing unnecessary risks that could lead to injuries and or death. Occupational health and safety regulations specify that all precautions should be taken to ensure personnel safety.

Hydraulic jacks have adjustable components. On a hydraulic jack, a visual inspection cannot detect a potential failure. When a hydraulic jack is left to lie on its side, a seal may become dry which may lead to cracks and ultimately failure. The real danger comes in when lifting an axle to replace a wheel, taking it off and letting it stand on the hydraulic jack. If the seal of the hydraulic jack is leaking, a slow descent will take place and when trying to replace the wheel, an operator will notice that the axle is too low. The operator is required to crawl underneath the trailer and again pump the hydraulic jack to create lift. In this event, a risk is introduced by means that the hydraulic jack could slip and shoot out injuring the operator or worst a load collapsing onto a person.

Further to potential seal failure, the head on a hydraulic jack does not grip around the axle properly. With a 3'' wide grip on a round axle, slipping off a hydraulic jack could spell disaster.

Most Trucks leave on a long haul without the most needed emergency tool for tire repairs, a reliable lifting device.

Hydraulic jacks, being a generic tool, are not made to lift trailer axles effectively. Trailer axles are almost 5'' higher which means that additional supporting equipment - like a sleeper block - is required to be able to provide the required reach. Even then, lifting a trailer axle is still not straightforward, nor easy or safe.

Hydraulic Jack Cost to Transporter:

For any transport operator, time literally means money. In one of our recent studies, we have found that we can save operators a minimum of 25 minutes during a breakdown or a service when lifting one side of an axle. When having to lift more than one side or more than one axle at a time, the time saving escalates dramatically, translating into huge costs savings.

There are many reasons to consider TrestleJacks, but the most important fact is that TrestleJacks is an axle stand with lifting capabilities that far exceeds that of conventional systems.

Transport Operator Specific:

Q. How will the driver know that the upright standing position has been reached?

A. The TrestleJack's design ensures that when the highest lifting point is reached the TrestleJack creates a positive stop that provides direct feedback to the driver in the cab. It may happen that the driver drive too far and the TrestleJack’s base plate is not level to the surface. Releasing the brakes will cause the TrestleJack to correct its position and level the base plate to the surface. Another way of measuring how far a driver needs to go is to place a chock block about 16'' from the rear tire of the tractor. This will also provide additional feedback to the driver.

Q. What happens if the driver drives over the TrestleJack when lifting an axle?

A. In our experience during field tests, most trailers fitted with 11R22.5, 12R22.5, 315/70R22.5 and 315/80R22.5 it is safe to drive over the TrestleJack. Driver training is important and we have found that once a driver has done the operation for the third time, confidence and know-how helps the driver realize when to stop and position the TrestleJack correctly. A chock block can also be placed 16'' behind the tractor’s wheel to ensure that the driver stops when the upright position has been reached. TrestleJacks design also notifies the driver in the cab through a positive feedback that the TrestleJack is in the upright position.

Q. Where do I store a TrestleJack when buying one for each vehicle?

A. TrestleJacks can be stored in the trailer or tractor’s toolbox. The TrestleJack can also be secured on top of one of the spare wheels. We are currently working with trailer manufacturers to design a bracket that can be mounted on the trailer for easy and secure access and storage. 

 

Tyre Service Agent or Workshop Specific:

Q. Can I unhook the trailer from the tractor to repair brake linings and bearings?

A. Yes. Lifting the entire empty trailer by placing two TrestleJacks per axle can be done in 83% less time than current conventional ways. Before unhooking the trailer, the trailer stands need to be lowered. Additionally, chock blocks can be placed in front of the TrestleJacks for further stability. 

The real benefits of using TrestleJacks can only become a reality when combining effective and efficient business processes & procedures orchestrated by management, adopted by employees working with the tool. For some organizations this may mean changing their current way of working, however, the inconvenience of change will be minuscule compared to the effort and time saving achieved by using TrestleJacks.

Services and Warranties:

Q. Does the TrestleJack come with a warranty?

A. TrestleJacks comes with a limited 1-year warranty. 

It warrants this product against defects in workmanship for one year from the date of purchase. During this warranty period, this product will be repaired or replaced, at TrestleJacksUSA discretion, without charge. Please read your instructions thoroughly and use this product only as directed. This warranty does not cover any damage due to accidental misuse, abuse or negligence. Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. The seller shall not be liable for any incidental or consequential damage for breach of any expressed or implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of the warranty.