Situations where the car cannot start or it has received critical damage to the chassis require immediate evacuation. The use of standard towing on the cable in such cases can lead to the final failure of the transmission or wheels. That's why. run-in It is an indispensable tool in the arsenal of motorists and professional tow trucks.
This device allows you to lift one axle of the car above the road, minimizing tire wear and eliminating the risk of damage to the gearbox when towing rear-wheel drive or all-wheel drive models. Properly selected and installed rolling ensures safe movement of the vehicle over long distances.
In this article, we will analyze in detail the design features of various models, the criteria for choosing the load capacity and the step-by-step installation algorithm. Understanding these nuances will help you avoid costly mistakes and body damage in an emergency situation on the road.
Design features and principle of work
The basis of the design is a powerful frame made of high-strength steel, which takes the main load from the weight of the front or rear of the car. To the frame are attached wheels that provide free rolling, and stops that fix the wheel of the machine. Hydraulic jackintegrated into the system, allows smoothly lifting the axle of the vehicle until the complete separation from the road surface.
The key element of security is rubber-stitch and pasquements. They not only securely fix the tire, but also protect the discs and bumper from scratches and mechanical damage during transportation. Some modern models are equipped with adjustable grippers, which allows them to be used for cars with different clearance.
⚠️ Note: The use of rolls with damaged frame or deformed lodgings is strictly prohibited, as this can lead to the car slipping while driving.
The principle of operation of the device is based on lever mechanics and hydraulic pressure. The operator sets the roll under the wheel, then by means of the lever of the jack raises the platform together with the car. After fixing the wheel in the beds and raising the axle, the vehicle is ready for towing.
Why can't we tow all-wheel drive on a cable?
In all-wheel drive cars (4WD, AWD) all wheels are connected through a transfer case and differentials. When towing on two wheels, one bridge rotates and the second stands. This causes oil to circulate without lubrication and heat the nodes, leading to jamming of the dispenser and expensive repairs. The sliding solves this problem by lifting one bridge completely.
Classification of skates: types and purpose
The market of auto tools offers many modifications, each of which is designed to solve specific tasks. The choice of a specific type depends on the weight of the car, operating conditions and frequency of use of the equipment. The wrong choice of the type of device can lead to ineffective operation or failure of the tool itself.
The following types of sub-coats are most common:
- 🚗 Universal roll-course - suitable for most passenger cars with standard ground clearance and equipped with adjustable stops.
- 🚙 Reinforced models - are designed for SUVs, crossovers and light commercial vans with increased load capacity.
- 🏎️ Low-profile options - designed specifically for sports cars with minimal ground clearance, where a standard roll-in just won't climb under the bottom.
- 🚚 Composite structures - allow you to disassemble the device for compact transportation in the trunk of a passenger car.
Special attention should be paid to the models with two-jackIt allows you to lift the car from both sides at once, providing perfect balance. However, for the average user, a standard set of two independent devices is most often enough.
Selection criteria: load capacity and materials
When buying equipment, the parameter is the maximum load on one axle. It should be borne in mind that when lifting the front of the car, the roll-up accounts for up to 60-70% of the total weight of the car due to the weight of the engine. Therefore, the margin of safety must be significant.
Pay attention to the following technical characteristics:
- 📏 Load capacity - for passenger cars, 2-2.5 tons per set is usually enough, for SUVs, 3 tons and above are required.
- 🛡️ fabrication - Preferably tempered steel with anticorrosion coating, withstanding dynamic loads.
- 🎡 Type of wheel Polyurethane wheels are better than rubber wheels, as they leave no traces on the asphalt and are more resistant to punctures.
- 🔧 Height of pickup Critical parameter for low cars; the minimum height should be less than the ground clearance of the car.
Cheap silimin or thin-walled steel analogues can burst under load, leading to an emergency. Availability of a certificate of conformity and a warranty card It is a prerequisite for the purchase of professional equipment for evacuation.
It is also worth assessing the ergonomics of the jack handle and the convenience of fixing the wheel. The mechanism should work smoothly, without jerks, and the fixers should reliably hold the tire even when shaking on uneven roads.
Step-by-step instructions for installing a run-down
The installation process requires care and compliance with safety precautions. Before starting work, make sure that the car is on a flat hard surface, and the hand brake is tightened. If the car is immobilized due to a breakdown, make sure that it is reliably fixed with recoil stops on the opposite side.
☑️ Preparation for installation
The algorithm of actions during installation is as follows:
First, the roll is brought under the front wheel strictly perpendicular to the axis of the car. The center of the wheel must coincide with the center of the lobe. Then the lever of the jack is lifted until the wheel is removed from the ground. It is important to ensure that the car does not move to the side.
After lifting, it is necessary to securely fix the wheel in the lozenges using belts or mechanical grippers. Only after a double check of fixation, you can remove the car from the hand brake and start towing. For rear-wheel drive cars, a similar operation is carried out with the rear wheels.
⚠️ Warning: Never be under a raised car unless it is fitted with additional safety supports. Hydraulics can leak at any time.
When towing, the speed should not exceed 40-50 km / h, and the driving style should be as smooth as possible, without sharp jerks and braking. This will prevent the rear of the car from swinging and reduce the load on the mounting points.
Lubricate the rubbing metal parts of the roll with silicone lubricant before installation if it is cold outside. This will prevent the freezing of mechanisms and facilitate the work of the jack.
Comparative Characteristics Table
To simplify the choice, consider the comparative characteristics of popular types of skates. These parameters will help you determine the model that is optimal for your fleet or private garage collection.
| Parameter | Passenger cars | Off-roaders | Microbuses |
|---|---|---|---|
| Load capacity (per 2 pcs) | 2,000 kg | up to 3,500 kg | up to 4,000 kg |
| Min. pick-up | 90 mm | 140 mm | 150 mm |
| Wheel material | Polyurethane | Rubber/Polyurethane | Reinforced rubber |
| Weight of kit | 12-15 kg | 20-25 kg | 25-30 kg |
As can be seen from the table, the difference in dimensions and weight of equipment is significant. For owners of heavy SUV models, saving on the class of strength of the skates does not make sense, since the risk of structural destruction increases exponentially.
The choice of a run with a payload capacity of 20-30% prolongs the service life of the hydraulics and guarantees safety when operating at the limit of capabilities.
Frequent errors and precautions
Inexperienced users often neglect basic operating rules, leading to property damage or injuries. One of the common mistakes is to try to roll the car without first leveling the position of the wheels. A curved set run can jump in the first seconds of movement.
It is also dangerous to use the device on soft ground or snow without special linings. The roll-up wheels can fail, which will lead to a skewed axis and the fall of the car. In such cases, it is necessary to use wide wooden or metal plates to increase the support area.
⚠️ Note: It is forbidden to use the runways to lift the car for the purpose of carrying out repair work under the bottom. This device is designed solely for transportation, not static weight retention.
Regular maintenance of the hydraulic system and verification of the integrity of the welded frame seams are mandatory before each season of operation. The appearance of cracks or oil stains requires immediate equipment failure before repair.
Can I use a slack on the ice?
Use on ice is highly undesirable due to the low coefficient of adhesion of the roll-up wheels to the surface. If necessary, you need to sprinkle the path with sand or use special anti-slip mats under the wheels of the device.
How to store the slack in the off-season?
Store the device should be in a dry room, lowering the jack in the lower position. It is recommended to lubricate the hydraulic rods with conservation lubricant and cover the device with a cloth to protect against dust.
What to do if the pressure does not hold?
Most likely, the problem is in the throughpass valve or lack of oil. It is necessary to add hydraulic oil and carry out the pumping procedure of the system according to the manufacturer's instructions.
Is it suitable for a car with air suspension?
Yeah, but with caution. Before installation, it is recommended to transfer the air suspension