Operation of small-sized vessel is impossible without a reliable transportation system, where the key element is the operation of the boat. sunset-rollerIt is this unit that takes on a tremendous load when loading and unloading the boat, ensuring that the hull slides smoothly along the guides. Incorrectly selected or worn out element can cause damage to the helcoat, a hole in the bottom or even an emergency on the descent into the water.
Many owners underestimate the importance of regularly checking the condition of the support rollers, considering them to be consumables that change only when a complete failure. However, timely diagnosis allows you to identify microcracks, backlash in bearings or axis deformation before they cause damage to the boat. In this article, we will discuss in detail all aspects of choosing, installing and maintaining a given unit, so that your child can be treated with a scalp. PVC Or a metal boat has been in service for years.
The current market offers many modifications, from low-cost plastic options to reinforced polyurethane-coated structures, and understanding the differences between them is critical to the safety of your cargo. loading.
Design features and types of materials
The basis of any support element is the material from which its working body is made, it is the material that contacts the bottom of the vessel and must have certain physical and mechanical properties. Polyurethane Today, it is considered the gold standard for heavy boats because it combines high wear resistance and sufficient softness to avoid scratching the hull. Unlike it, conventional rubber can quickly break down under the influence of ultraviolet light and gasoline.
Plastic models, often made of polyethylene, are low cost, but have a significant disadvantage - low friction coefficient when wet and a tendency to crack in the cold. For light inflatable boats, they may be suitable, but for heavy aluminum or fiberglass vessels, it is better to choose a stronger option. metal-core or the sleeve significantly increases the service life of the product.
⚠️ Attention: The use of rollers made of hard rubber or plastic on thin-bottomed boats can lead to scuffs and microcracks in the gelcoat during long transportation on uneven roads.
The choice also takes into account the type of bearing or sleeve. Needle bearings They provide perfect rotation, but they require tightness, otherwise the water and sand will quickly disable them. Simple sliding sleeves are less demanding to maintain, but create more resistance when scrolling, which is important to consider when manually loading a heavy boat.
For maximum service life, choose rollers labeled "Marine Grade", which guarantees the resistance of the material to salt water and aggressive environments.
Criteria for the choice of the type of boat and trailer
Selection of the correct size and type of support directly depends on the dimensions of your boat and the design of the trailer itself. Roller diameter The larger the contact area, the lower the specific pressure on the body, but the higher the trailer side should be, the standard dimensions vary from 60 to 120 mm, and deviations from the manufacturer's recommended parameters can disrupt the load geometry.
The load capacity of one unit is an important parameter. The total load is distributed between all the reference points, but when moving through irregularities, the dynamic load on the front rollers can increase significantly. So the safety margin should be significant. You should not save on this element, since replacing the damaged bottom of the boat will cost ten times more than a set of new supports.
- 🚤 For PVC boats up to 3.5 meters long, optimal rollers with a diameter of 60-80 mm from soft rubber or PVC.
- ⚓ Aluminum boats require the installation of polyurethane models with a metal sleeve with a diameter of 80 mm.
- 🛥️ Heavy fiberglass vessels require reinforced supports with a double row of bearings.
- 🔩 In the presence of a keel beam, it is critically important to use V-shaped rollers for centering.
The way of attachment should also be considered. Most modern trailers use standard studs, but there are also unique locking systems. Before buying, be sure to measure the diameter of the landing hole and the length of the free stud. Size mismatch This will cause the roller to jam or, conversely, to dangle, creating a vibration.
Comparative table of material specifications
To organize the information and help you make the right choice, we have prepared a summary table that reflects the basic performance properties of the various materials used in manufacturing. supportRemember, there is no perfect material, everyone has their own advantages and applications.
| Materials | Wear resistance | Protection of the hull | Term of service | Price. |
|---|---|---|---|---|
| Polyurethane | High. | Great. | 5-7 years | Medium/High |
| Rubber | Medium | Good. | 2-3 years | Low. |
| Plastic (PVC) | Low. | Medium | 1-2 years | Low. |
| Composite | Very high. | Good. | 7 years | High. |
As you can see from the table, polyurethane And composites are better for durability, but they require higher upfront investment, but when you recalculate the cost of ownership for life, they are better than the cheap rubber that you have to change every season, and cheap materials often leave black marks on the light hull of the boat.
Investment in high-quality polyurethane rollers pays off in 2-3 seasons due to the safety of the boat hull and the absence of the need for frequent replacement.
Step-by-step instructions for replacement and installation
The process of replacing worn-out elements does not require complex equipment, but requires care and adherence to a sequence of actions. Before starting work, make sure that the trailer is on a flat hard surface and is reliably fixed. Security When working with heavy loads and metal structures should always be in the first place.
First, you have to remove the old roller. This usually requires unscrewing the nut at the end of the stud. If you have acid threads from salt and time, use a penetrating lubricant, like WD-40, and let it work for 10 to 15 minutes. Don't put too much effort into not breaking the thread or breaking the bracket.
☑️ Preparation for roller replacement
After removing the old element, clean the seat of dirt, rust and residues of old lubricant. If the stud has damage or severe corrosion, it must also be replaced. sunsetMake sure it rotates freely on the axis, tighten the nut with the necessary force, but do not pull it over so as not to deform the inner sleeve.
⚠️ Warning: When installing, never lubricate the working surface of the roller with solidol or lithole, as sand will stick on it, which will work as an abrasive, scratching the bottom of the boat.
The final step is to check the rotation of all the elements installed, and they have to be scrolled by light touch with the hand, and if the roller is dead weight, then the nut is pulled or the axis is skewed, and the correct installation ensures that the boat will go easily when it descends, without jerks or jamming.
Service and extension
Regular maintenance allows you to significantly increase the life of the trailer components. After each trip, especially on salt water, the structure must be washed with fresh water. Corrosion It can imperceptibly undermine the inner sleeve, which will lead to backlash.
Once a season, it is recommended to shoot rollers and inspect the condition of bearings or bushings. If you hear squeaking or feel stinging when scrolling, the knot requires attention. For sliding bearings, you can use special water-resistant lithium-based lubricants that are not washed out with water. For needle bearings, the sealability of the oils is important.
- 🧼 Wash the trailer with fresh water after each outing.
- 🔍 Check the nuts before each long trip.
- 🛢️ Lubricate the axles only with water-resistant compositions, avoiding hitting the working surface.
- ❄️ For the winter, remove removable elements and store them in a warm room.
Storage of the trailer is also important, and if possible, it is better to keep it under a canopy or in the garage, so that ultraviolet light does not destroy the structure of the polymer. Rubber and plastic The components in the constant sun lose elasticity and become brittle, and a simple awning or cover can extend the life of your equipment for several years.
How to restore the polished shine of rollers?
If the polyurethane rollers are lost and coated, they can be gently washed with soap solution and a soft brush. Do not use aggressive solvents, gasoline or acetone, as they can damage the structure of the polymer. After washing, let them dry completely before installation.
Frequent errors and problems in operation
One of the most common mistakes is to ignore the backlash. Owners often think that a small swing of the roller is not scary until they find a wiped hole in the bottom of the boat. The backlash indicates that the inner sleeve has collapsed or the output in the landing hole.
Another problem is the use of inappropriate analogues, where attempts to install rollers from other equipment or homemade versions of wood or metal without coating often end up in damage to property. Smoothness of the surface Chemical neutrality of the material is not a whim, but a necessity for the integrity of the boat's hull.
⚠️ Warning: Never use metal rollers without a special soft coating to transport boats, as any impact or vibration will result in guaranteed damage to the hull.
Also worth mentioning is the problem of improper height adjustment: if the rollers are set too high or low relative to the keel line, the load is distributed unevenly, this leads to deformation of the boat hull during prolonged parking on the trailer and worsens the driving performance of the trailer on the road, adjusting must be strictly according to the manufacturer's instructions.
Questions and Answers (FAQ)
How often should I change the rollers on the boat trailer?
The service life depends on the material and the intensity of operation: polyurethane models last 5-7 years, rubber models - 2-3 years. However, visual inspection and backlash testing should be carried out annually.
Can I use the silk for better sliding?
Lubricating the working surface in contact with the boat is strictly forbidden. This will lead to adhesion of sand and dirt that will scratch the hull, lubricated only internal bearings or bushings (if the design allows), and only water resistant lubricants.
What is the difference between V-shaped rollers and flat ones?
V-shaped rollers are designed to support and center the boat, they take the main vertical load, flat or side rollers serve to support the side and prevent lateral rolling, you can not replace one type with another.
Why are the new rollers creaking?
The screeching of new rollers can be caused by the nut pulling, the lack of lubrication in the bushing (if it is designed), or the hit of sand. If the creak does not pass after checking the puffing and washing, it may be a defect in the material itself or the inner sleeve.