Choosing the right trailer for transporting a boat is not just a matter of convenience, but the need to ensure safety on the road and the safety of expensive equipment. Among domestic manufacturers, the Moscow plant of specialized cars, whose products have proven to be a reliable alternative to imported analogues, stands out. MIAS 81771C It occupies a special place in the brand line, offering the optimal balance between dimensions and load capacity for owners of medium-sized boats and boats.
The trailer is designed to meet Russian operational realities, which means working in conditions of bad roads, temperature changes and high humidity. The frame and chassis are designed with a margin of safety that is often lacking in cheaper competitors. boating owners appreciate this model for the ability to transport not only boats, but also other equipment due to the versatility of the platform.
In this article, we will discuss in detail the technical nuances, features of the assembly and nuances of maintenance of this trailer. You will learn why this modification is often the choice of professionals and fans of outdoor activities on the water. We will touch on the issues of legalization, setting up lighting equipment and proper distribution of cargo.
Design features and advantages of the frame
The basis of durability of any vehicle is its load-bearing structure. 81771C It uses hot-galvanized steel, which provides excellent corrosion protection, and unlike painted steel, zinc coatings protect the metal even when microcracks occur, because zinc acts as a protective shield, which is critical for a trailer that regularly comes into contact with water and salt.
The frame is reinforced with additional spars and crossbars, which allows you to withstand dynamic loads when driving on rough terrain. Breathing The trailer is V-shaped, which increases stability when towing at high speeds. The design eliminates the shifting of the center of gravity, making the control of the car with the trailer more predictable.
Features of welds
All welded joints on the frame of the MZSA 81771C are performed by semi-automatic welding in a protective gas environment, which provides deep boiling and high strength of the seam, eliminating the risk of structural destruction under load. After welding, the seams are also galvanized, which prevents them from rusting in the first place.
It is important to note the presence of enhanced breathed With spring suspension (depending on the specific equipment and year of production, although the 81771C model often comes on springs or torsion, which requires clarification from the dealer, but the classics are springs).
⚠️ Warning: Despite galvanizing, after each trip on salt water or winter road with reagents, you must thoroughly wash the frame with fresh water. The layer of salt and dirt, drying, creates an aggressive environment that can damage even the zinc coating in the chipping areas.
Chassis and braking system
Traffic safety depends on the condition of the wheels and brakes. 81771C The R13 wheels are standard for passenger trailers of this capacity; the wide range of tires on the market makes it easy to find replacements in case of puncture anywhere in the country; the wheel hubs are equipped with bearings that require regular but not frequent maintenance.
One of the key features of this model is the ability to equip brakeFor trailers with a gross mass of more than 750 kg (and the total mass of 81771C is 1050 kg), the presence of brakes is a mandatory requirement of traffic rules. Brakes can be inertial type, which are activated when the brake of the traction vehicle is pressed, which increases safety by reducing the braking distance of the road train.
- 🚗 Inertial break-in automatically adjusts the braking force depending on the speed of reducing the speed of the car.
- 🛞 The R13 wheels provide excellent cross-country and seasonal availability of rubber.
- 🔧 The design of the hubs makes it easy to replace bearings without special tools.
The chassis maintenance is reduced to periodic lubrication of bearings and checking the tension of springs. If your trailer is equipped with brakes, you need to monitor the condition of the brake pads and cables. The brake mechanism is adjusted through a special screw on the brake drum, accessed through the process hole.
Lighting equipment and electricians
The lights are working properly, and they're going to be noticed on the road in the dark and in bad weather, and they're going to have modern LED optics installed on their trailers that consume less energy and last longer than traditional incandescent lights, and they're going to be put in corrugated hoses, which protects them from mechanical damage and moisture.
However, even good wiring requires attention. Connector contacts are often oxidized due to constant contact with water when launching the boat. It is recommended to use a contact spray or a special lubricant for connectors. Check the health of all lights should be carried out before each trip, as a malfunction of the stop light or turn signal can lead to an emergency.
The connection is simple: left turn, right turn, mass, left stop, right stop, dimensions and fog lamp (or +12V for charging, depending on the car's slinging) if you install additional position lights on a wide boat, they need to be powered through a separate relay from the car's battery, not from the trailer's dimensions.
⚠️ Attention: When washing a trailer under high pressure, try not to direct the jet of water directly to the taillights and the entry points of the wire harness into the headlamp body. High pressure can disrupt the seals, which will lead to fogging and short circuit.
Load capacity and load distribution
rated carrying capacity of the model 81771C It is 795 kg, with a total weight of 1050 kg and a net weight of about 255 kg. These figures are limiting, and their exceeding is strictly prohibited. However, it is important not only not to exceed the limit, but also to correctly distribute the weight of the cargo. The center of gravity of the boat should be located strictly above the axis of the trailer or slightly shifted forward (breathing).
Incorrect loading can lead to unloading of the rear axle of the car (if the center of gravity is shifted backwards) or to excessive load on the farcop (if the center of gravity is strongly shifted forwards). The optimal position is considered when the load on the farcop ball is 25-50 kg. To adjust this parameter, you can move the lodgings or the boat itself on the platform, if the design allows.
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Load capacity | 795 | kilogram |
| Estate mass | 255 | kilogram |
| Total mass | 1050 | kilogram |
| Length of platform | 4190 | mm |
| Platform width | 2020 | mm |
When loading a heavy outboard motor, you have to consider that it shifts the center of gravity backwards. So the boat in the trailer should be set so that the engine is closer to the axis of the trailer. If you are carrying a boat with a tank full of fuel, this also adds weight to the aft, which requires adjusting the position of the boat on the paddles.
Proper weight distribution is not only about safety, it's also about fuel economy, and the center of gravity shifted backwards causes the car to repent, increasing fuel consumption and tire wear.
Winter Operation and Storage
Winter is a tough test for any technology, and trailers are no exception, and the chemicals that are sprayed on the roads can quickly destroy unprotected metal. MIAS 81771C It has galvanized, mechanical damage (scrapes, chips) become hotbeds of corrosion. After winter operation, it is recommended to conduct a revision of the coating and, if necessary, treat the damaged areas with zinc-containing soil.
If you can't, use a special case to protect the lodgings and frame from precipitation and ultraviolet light. Rubber elements (blowers, wiring harnesses) can dry and crack under the sun. Before placing the wheels for long-term storage, it is advisable to lift them on the stands to relieve the load from rubber and bearings.
During the cold season, the lubricant in bearings can thicken, which increases rolling resistance. Use lubricants with a wide temperature range, such as lithium lubricants with molybdenum disulfide or specialized marine lubricants, which retain their properties in both heat and severe frost.
☑️ Preparation for winter storage
Tuning and sub-boat redesign
The factory equipment of the MZSA trailer is versatile, but for the ideal landing of a particular boat, it often requires modification. The owner may face the need to adjust the height or angle of the inclination of the pads. This uses adjustable racks that can be purchased separately or made independently from a profile pipe.
A popular type of tuning is the installation of a keel roller at the front of the trailer, which makes it easier to load the boat from the water, especially if the slopes are lowered, and many owners also install a winch with a large departure of the cable or replace the regular cable with a stronger synthetic analogue that does not absorb water and does not rot.
Additional side rollers (kilblocks) will help to fix the boat with a wide hull and prevent it from rolling when driving on rough roads. However, the installation of any additional elements must be made taking into account the change in the total mass of the trailer, so as not to go beyond the permitted limits. load capacity.
⚠️ Attention: Any welding work on the trailer frame should be carried out with caution. High temperatures can destroy the zinc coating within a radius of 10-15 cm from the seam. After welding, be sure to restore protection with cold galvanizing.
Frequently Asked Questions (FAQ)
Do I need to register the trailer MZSA 81771C in the traffic police?
The total mass of the trailer is 1050 kg, which exceeds the threshold of 750 kg, after which the presence of PTS and registration plates (numbers) is a mandatory requirement of the law. In addition, category “E” may be required in some cases if the total mass of the road train exceeds 3,500 kg, although for many cars with a small trailer category “B” is sufficient.
What is the maximum speed of the MZSA trailer?
According to the traffic rules of the Russian Federation, the maximum speed of a passenger car with a trailer on suburban roads should not exceed 90 km / h, and on highways - 110 km / h (although for trailers there is often a limit of 90 km / h everywhere). Exceeding speed with a trailer significantly increases the risk of loss of control, especially in side wind or on wet roads.
Can I carry a quad bike on this trailer?
Technically, the platform size (length 4190 mm, width 2020 mm) allows you to accommodate most ATVs. the capacity of 795 kg also with a margin overtakes the weight of the ATV (usually 300-450 kg), the main thing is to secure the equipment with slings so that it does not shift during movement.
How often should the bearings of the hubs be lubricated?
The manufacturer recommends that bearings be inspected and lubricated every 10,000 km or once a year, whichever comes first. When operating in water (frequent boat descents), it is better to reduce the service interval to once a season, since water can wash the lubricant through the glands.
When buying a used trailer, pay attention to the condition of the spars under the pads, which often accumulates moisture and dirt, leading to hidden corrosion that you can not see when you look at the outside from above.