Finding a reliable vehicle for the transportation of a swimming vehicle often leads to consideration of the products of the Moscow plant of special vehicles. MZSA dual-axle trailer For a boat, it becomes a logical choice for owners of large boats, heavy inflatable boats with powerful engines or specialized floating structures. Unlike uniaxial counterparts, this technique provides significantly higher stability on the track and allows you to transport loads of impressive mass without the risk of overload.
The main advantage of this category of equipment is the distribution of weight on four wheels, which significantly reduces the load on the road surface and increases the safety of maneuvering. MZSA They are famous for their modular design and use of quality components, which makes them popular among boaters throughout the country. galvanized They are a key factor in durability, protecting the structure from the aggressive effects of salt water and reagents.
Choosing a particular model requires careful analysis of the specifications of your boat, since the load capacity should be at least 15-20%. In this review, we will discuss in detail the technical features, nuances of operation and the possibilities of upgrading biaxial platforms for water technology.
Technical specifications and design features
Constructively double-axle trailer It's a complex engineering system where every detail plays a critical role in driving safety, and the frame is usually made from a rectangular-sectional profile tube, which provides high torsional and bending rigidity, and this is especially important when transporting boats that are often center of gravity shifted and sailing high.
The suspension in such models is most often independent torsion, although there are options with springs. MZSA It's maintenance-free, compact, and has great smoothness, and it's important to note that a two-axle trolley, if you puncture one wheel, allows you to get to the repair site without critical roll, which is not possible on single-axle versions.
Brakes are also an important design element. For heavy boats, having inertial hydraulic or mechanical brakes on all wheels is not just an option, it's a necessity. It allows you to safely stop the train on the slopes and reduces the load on the tractor's braking system. auto-adjustment brake mechanisms.
- 🚛 High load capacity, allowing to transport boats up to 7-8 meters long.
- ⚓ Reinforced frame with anticorrosion coating, resistant to salt water.
- ⚙️ Reliable torsion suspension that does not require regular lubrication.
- 🛑 Effective brake system of coasting on all wheels for heavy loads.
The lighting system is a special concern, and modern models use wiring that is stacked in corrugated hoses, and the connectors are protected from moisture, but even high-quality electricians require periodic inspection, especially after long trips over rough terrain.
Features of the MZSA frame
The frame of the trailers MHSA is made of steel ST3sp5 and undergoes hot galvanizing, which provides a life of up to 50 years, even when operating in aggressive environments, unlike painted counterparts, which require constant coloring.
Popular models for transporting boats
The plant range includes many modifications adapted for different types of cargo. For water-engineers, the most interesting are special models with pads or keel stops. Standard on-board trailers are also used, but require the installation of additional slip equipment.
Model 817717 It is often the choice for medium-sized inflatable boats with hard bottoms and outboard motors, which are versatile and capable of installing additional equipment. 81773which have an increased length of the platform and a reinforced chassis.
When choosing between onboard and specialized options, you should consider the frequency of use. If you plan to use a trailer only for a boat, you should take a specialized version. If the equipment will carry building materials or ATVs, the universal board will be more practical, but will require reworking of the paddles.
A platform that is too long can cause problems when parking, and a short one can cause a dangerous overhang of the stern, and the best option is when the bow of the boat is above the front of the frame, and the engine does not protrude beyond the dimensions of the trailer.
Calculation of load capacity and total mass
One of the most critical parameters is full-body It consists of the mass of the vehicle itself (the mass in running order) and the mass of the cargo carried, which is unacceptable and entails fines and the risk of undercarriage destruction.
For biaxial models, the total weight is often 750 kg or 1500 kg. The difference is significant: to drive a trailer up to 750 kg, category B is often sufficient without additional conditions (depending on the total mass of the trailer), and over 750 kg may require category E rights or the conditions for the mass of the road train.
When calculating, consider not only the weight of the boat's hull, but also the mass of the engine, fuel in tanks, anchors, equipment and water in holds. load-bearing Always keep a safety margin of about 10 to 15 percent.
| Parameter | Model 750 kg | Model 1500 kg | Model 2000+ kg |
|---|---|---|---|
| Total mass | 750 kg | 1500 kg | 2000-2500 kg |
| Load capacity | ~500-600 kg | ~1200 kg | ~1700 kg |
| Brake system | Optionally. | Sure. | Definitely (enhanced) |
| Category of rights | B (often) | BE (often) | BE / C1E |
Remember, the breather also has a vertical load limit. A boat's nose that is too heavy can damage the coupling device of the car or the trailer beam itself. Equal weight distribution along the length of the platform is the key to safe riding.
Always check the maximum permissible mass of your car in the PTS – it should not be less than the mass of the trailer without brakes or should take into account its full mass in the presence of brakes.
Preparation for the season: the checklist of the owner
Operation of equipment in water and road conditions requires regular maintenance, before the navigation season, a complete inspection of all components and assemblies is necessary, ignoring simple procedures can lead to breakdowns in transit or on the ramp.
Special attention should be paid to the hubs of the wheels. Even if you use torsion suspension, the bearings of the hubs require inspection. The presence of a backlash or a hum when the wheel is rotating is a signal to replace or lubricate. For biaxial trailers, synchronization of the wheels is critical.
☑️ Pre-season checks
The winch is another important element: the rope or belt should not be damaged, villous or corrosive, the mechanism should work smoothly, without jamming, it is recommended to lubricate the mechanism with a special lubricant that is resistant to washing out with water.
Checking lighting devices is mandatory before every long trip. Headlight contacts are often oxidized due to humidity. Using diode optics significantly reduces the risk of lamp burnout and vibration damage, which is important for biaxial structures with their specific vibrations.
Installation of additional equipment and tuning
Standard equipment does not always meet the needs of avid aquatic motorists; often additional equipment is required to make it easier to load and fix the boat, and tuning allows you to adapt the serial trailer for specific tasks.
One of the most useful improvements is the installation support-wheel This device makes it much easier to maneuver a trailer manually on a ramp or in a garage, and without it, it's extremely difficult to move a heavy biaxial platform from a standstill.
Also popular is the installation of brackets for the spare wheel, if they are not provided for by the design, or the transition to more off-road tires. For night trips or storage in the open parking area, an indispensable protective awning or cover that protects the boat from ultrafi! \ nlet and dust.
Use silicone lubricant to treat rubber seals and electrical connectors – this will prevent them from freezing in winter and oxidizing in summer.
Lodge upgrades are common practice, where owners install additional adjustable supports or change standard rollers to keel stops to better fix the body, and it is important to immediately treat the cut-off areas with anticores when checking new holes in the frame so that the zinc layer is not disturbed.
Safe towing and parking rules
Driving with a two-axle trailer has its own specifications: the length of the train increases, and the inertia increases many times, the braking distance becomes longer, and the maneuverability decreases, especially when you go back.
When parking on the ramp, you need to be careful. The two-axle trailer is less prone to "wafting" but has a larger turning radius. When you roll back, you need to turn the steering wheel in the opposite direction relative to the desired direction of the trailer, but do it smoothly so as not to fold the composition.
⚠️ Warning: When you descent the boat from the trailer into the water, make sure that water does not reach the hubs of the wheels, unless they are sealed. Prolonged immersion of bearings in water will lead to their rapid failure.
The boat must be fastened by a minimum of two belts that tighten the bow and a safety cable or motor chain, and the use of only a winch cable for fixation during transportation is prohibited - it can stretch or burst in transit.
Speed mode also requires compliance: On the track with the trailer, it is safer to travel at speeds 10-15 km / h below the permitted speed, especially in rain or side winds. The boat has a high sailing speed, and a gust of wind can dramatically shift the center of gravity.
What to do when the trailer is wagged?
If the trailer starts to throw from side to side, in no case do not brake sharply! This will increase the sway. You need to smoothly reduce the speed by releasing the gas pedal, and try to keep the steering wheel straight, waiting for the oscillation to fade.
Frequently Asked Questions (FAQ)
Do I need an E category license for a dual-axle trailer?
If the total mass of the trailer is up to 750 kg, category "B" is usually sufficient. If the mass of the trailer is between 750 kg and 3500 kg, category "B" allows control if the total permissible maximum mass of the road train does not exceed 3,500 kg. Otherwise, category "BE" is required.
How often should the hubs of a two-axle trailer be lubricated?
The manufacturer recommends lubricating the hub bearings every 10,000 km or once a year, whichever comes first.
Can I wash the MZSA trailer on a high pressure wash?
You can wash, but avoid direct high-pressure water jets in bearings, electrical connectors and brakes, which can wash out lubricant or drive moisture inside sealed units.
What is the maximum tire pressure for two-axle models?
Usually the pressure is 2.0-2.2 atmosphere for standard tires, but the exact value is always indicated on the sidewall of a particular tire. Over-pumped tires worsen traction, and under-pumped tires lead to overheating and cord destruction.
Does the galvanized trailer of MZSA rust?
Hot galvanizing provides the highest protection, but it doesn't guarantee 100% corrosion from mechanical damage. If you scratch the frame to metal, it can cause rust in that area, and you need to treat it with zinc-containing soils right away.