Raising a drop axle trailer involves engaging its air suspension system to inflate the airbags, effectively lifting the trailer deck to a desired height or to clear obstacles. This process typically requires a functioning air compressor, properly adjusted air pressure, and familiarity with the trailer’s control system.
Understanding Drop Axle Trailers
Drop axle trailers, also known as lowboy trailers or detachable gooseneck trailers (DGNs), are designed to haul exceptionally tall or heavy loads. Their defining characteristic is the low deck height, achieved by incorporating a drop in the frame between the gooseneck and the rear axles. This design maximizes vertical clearance, allowing for the transport of oversized equipment and machinery that would otherwise exceed legal height restrictions. Understanding the specific mechanisms for raising these trailers is crucial for safe and efficient operation.
Why Raise a Drop Axle Trailer?
There are several reasons why you might need to raise the deck of a drop axle trailer.
- Obstacle Clearance: Navigating uneven terrain, railway crossings, or obstacles on the road often necessitates raising the trailer to prevent damage to the deck, cargo, or the trailer’s undercarriage.
- Loading and Unloading: Raising the trailer can simplify the loading and unloading process, particularly when using ramps or docks. It allows for a more gradual incline, minimizing strain on equipment and personnel.
- Maintenance and Repairs: Raising the trailer provides increased ground clearance, making it easier to access and perform maintenance or repairs on the axles, suspension, or other undercarriage components.
- Legal Height Compliance: While the purpose of a drop axle is to lower the overall height, sometimes adjustments are necessary to meet specific state or local regulations regarding maximum vehicle height during transit.
The Process of Raising a Drop Axle Trailer
The exact method for raising a drop axle trailer varies slightly depending on the specific model and manufacturer, but the underlying principle remains the same: using compressed air to inflate the airbags in the suspension system. Here’s a general step-by-step guide:
- Safety First: Before beginning, ensure the trailer is parked on a level surface and the wheels are chocked to prevent any movement. Engage the parking brake on both the tractor and trailer.
- Locate the Air Controls: Familiarize yourself with the location of the air controls. These are typically located in a control box or panel near the trailer’s gooseneck or front. They may include switches, valves, or buttons labeled for raising or lowering the air suspension. Consult your trailer’s operating manual for specific instructions.
- Engage the Air Compressor: Ensure the air compressor is functioning correctly and has sufficient air pressure. Most heavy-duty trucks have a built-in air compressor that supplies air to the trailer.
- Activate the Raise Function: Select the appropriate switch or valve to initiate the “raise” function. This will direct compressed air into the airbags.
- Monitor the Air Pressure: Observe the air pressure gauges to ensure the air pressure is within the recommended operating range. Over-inflation can damage the airbags, while insufficient pressure will not provide the desired lift.
- Observe the Trailer Deck: As the airbags inflate, the trailer deck will gradually rise. Monitor the height and stop the inflation process when the desired height is achieved or when you reach the maximum allowable height.
- Secure the Height (If Applicable): Some drop axle trailers have a locking mechanism to secure the trailer deck at a specific height. If your trailer has this feature, engage it to prevent the deck from inadvertently lowering.
- Verify Clearance: After raising the trailer, double-check the clearance around tires, axles and the deck. Inspect for any obstructions or potential problems.
Troubleshooting Common Issues
Occasionally, you may encounter issues while raising a drop axle trailer. Here are a few common problems and potential solutions:
- Air Compressor Not Working: Check the air compressor’s power supply, fuses, and connections. Ensure the compressor is receiving adequate power and that there are no leaks in the air lines.
- Slow or Uneven Lifting: This could indicate a leak in one or more of the airbags, a malfunctioning air valve, or a problem with the air compressor. Inspect the airbags for damage and check the air lines for leaks.
- Trailer Not Lifting at All: This could be due to insufficient air pressure, a blocked air line, or a faulty air control valve. Verify the air pressure, inspect the air lines for obstructions, and test the air control valve.
FAQs: Deep Dive into Raising Drop Axle Trailers
Here are 12 Frequently Asked Questions to enhance your understanding of raising drop axle trailers:
FAQ 1: What is the recommended air pressure for raising a drop axle trailer?
The recommended air pressure varies depending on the trailer manufacturer and the specific airbag design. Consult your trailer’s operating manual for the recommended pressure range. Generally, it falls between 80-120 PSI. Never exceed the manufacturer’s recommended maximum pressure, as this can cause the airbags to rupture.
FAQ 2: Can I raise a drop axle trailer with a flat tire?
Attempting to raise a drop axle trailer with a flat tire is strongly discouraged. It can damage the trailer’s suspension system, put undue stress on the remaining tires, and potentially lead to further damage or even a rollover. Fix the flat tire before attempting to raise the trailer.
FAQ 3: How high can I safely raise a drop axle trailer?
The maximum safe lifting height is determined by the trailer’s design and the specific load being carried. Refer to your trailer’s operating manual for the maximum permissible height. Exceeding this height can compromise stability and increase the risk of accidents. Consider weight distribution and overhead clearances.
FAQ 4: How often should I inspect the airbags on my drop axle trailer?
Airbags should be inspected regularly, ideally before each trip. Look for signs of wear, cracks, leaks, or damage. Address any issues promptly to prevent more serious problems. A comprehensive inspection should also be conducted during scheduled maintenance.
FAQ 5: What tools do I need to raise a drop axle trailer?
Typically, no special tools are required beyond those necessary for general trailer maintenance, such as wrenches and screwdrivers. The primary component is a functioning air compressor on the tractor. However, a pressure gauge can be useful for monitoring air pressure accurately.
FAQ 6: What should I do if the trailer lowers unexpectedly after raising it?
If the trailer lowers unexpectedly, immediately stop the vehicle in a safe location. Check for leaks in the air lines, damaged airbags, or a malfunctioning air control valve. If the problem cannot be resolved on-site, contact a qualified mechanic for assistance. This could also indicate a problem with the height control valve.
FAQ 7: Can I modify the air suspension system on my drop axle trailer?
Modifying the air suspension system is generally not recommended unless it is done by a qualified technician and approved by the trailer manufacturer. Unauthorized modifications can compromise the trailer’s safety and void the warranty.
FAQ 8: How do I properly lower a drop axle trailer after raising it?
To lower the trailer, use the appropriate switch or valve to release air from the airbags. Monitor the descent of the deck and ensure it lowers evenly. Avoid abrupt or jerky movements. Some trailers require a specific sequence to lower correctly to avoid damaging the gooseneck.
FAQ 9: What is the difference between a mechanical and air suspension drop axle trailer?
While most modern drop axles utilize air suspension, older models sometimes use a mechanical suspension system. Air suspension offers a smoother ride and greater adjustability, while mechanical suspension is simpler and potentially more durable in some harsh environments. Most adjustments on mechanical systems require a professional.
FAQ 10: Can weather conditions affect the operation of the air suspension system?
Extreme temperatures can affect the performance of the air suspension system. Cold weather can cause air lines to freeze, while hot weather can cause them to expand. Regular maintenance and inspection can help mitigate these issues. Water accumulation in the air tanks can also cause issues in freezing conditions.
FAQ 11: What are the potential hazards associated with raising a drop axle trailer?
Potential hazards include: airbag rupture due to over-inflation, instability due to uneven lifting, crushing injuries if the trailer lowers unexpectedly, and damage to the trailer or cargo if proper procedures are not followed. Always prioritize safety and follow the manufacturer’s instructions. Under no circumstances should someone place any part of their body underneath a trailer supported only by air pressure.
FAQ 12: Where can I find more information about my specific drop axle trailer model?
The best source of information is your trailer’s operating manual. Contact the trailer manufacturer directly for any questions or concerns not covered in the manual. Consider seeking training from a certified professional on heavy equipment operation and maintenance.