Many hatchback owners Skoda Fabia They encounter a problem when the wipers start to work jerkily, make extraneous noise, or stop moving altogether. In most cases, the root of evil lies not in the blades themselves or even in the motor, but in the mechanism that transmits rotation - the windshield wiper trapezoid. It is this unit that is subject to maximum loads and exposure to aggressive environments.
Ignoring signs of malfunction trapezoid wipers may lead to burnout of the electric motor or destruction of fastenings on the car body. The second and third generation Skoda Fabia models are characterized by wear of the bushings in the places where the levers are attached, which causes play and disruption of the movement geometry. Understanding the operating principles of the unit and timely maintenance will help you avoid costly repairs.
Design and principle of operation of the mechanism
The windshield wiper trapezoid is a system of levers and rods that converts the rotational movement of the electric motor shaft into the reciprocating movement of the brushes. On Skoda Fabia This design is made of metal, but the moving joints have plastic bushings or ball joints, which wear out over time.
The key element is the gearbox built into the gearmotor. It reduces the speed and increases the torque. If trapezoidal hinges jammed, the motor experiences overload, which often leads to the thermal relay tripping or winding failure. Understanding this relationship is critical for correct diagnosis.
- ๐ The metal frame ensures the strength and durability of the structure.
- โ๏ธ Plastic bushings require regular lubrication and will deteriorate over time.
- ๐ The electric motor is connected through a connector protected from moisture.
The main signs of a trapezoid malfunction
Identify problems with windshield wiper mechanism possible even before complete disassembly. The first signal is a change in the operating sound. If previously the wipers worked quietly, but now you can hear a hum, grinding noise or a characteristic โrattlingโ sound, it means that the bushings have worn out and the metal part has begun to rub against the metal.
Another worrying sign is uneven brush speed. They can move slowly at the beginning of the stroke and accelerate sharply at the end, or get stuck at certain points in the trajectory. This suggests that the geometry trapeze Skoda Fabia broken, possibly due to deformation of the rod or severe play in the connections.
โ ๏ธ Attention: If the wiper motor hums, but the arms do not move, under no circumstances try to turn them on again many times in a row. This can lead to instantaneous burnout of the motor due to blocked rotor.
Sometimes the problem is disguised as a brush malfunction. The owners are trying to change the rubber bands, but this does not help. If wipers jump on the glass or they leave streaks even on a clean windshield, you need to check the smoothness of the trapezoid itself by disconnecting the levers from the rods.
- The wipers squeak and rattle
- Levers move jerkily
- The motor hums, but does not turn over
- Wipers stop in the middle
Diagnostics and testing of nodes
For an accurate diagnosis, it is necessary to remove the plastic grille (jabot) and the trapezoid itself. This is not difficult to do if you know the sequence of actions. First, the nuts securing the wiper arms are unscrewed, then the frill is removed. After this, access to the mechanism opens.
The inspection begins with a visual inspection. Look for signs of corrosion, cracks in the rods and, most importantly, the condition of the bushings. Try manually moving the levers. If there is noticeable play that cannot be eliminated by tightening, then the bushing requires replacement. On Skoda Fabia Often wears out exactly the sleeve at the place of attachment to the body.
- ๐ Check the sleeves for plastic scattering.
- ๐งผ Check the condition of the hinges for the presence of frozen old lubricant.
- ๐ Make sure that the thrusts do not have obvious bends or deformations.
How to check the engine separately from the trapezoid?
Disconnect the power connector and directly apply the battery voltage to the motor contacts. If it spins smoothly and powerfully, the problem is in the trapezoid. If it hums and does not spin, the engine is replaced.
The engine has to spend more energy, which reduces its life. Regular cleaning and lubrication can extend the life of the node for several years.
โ๏ธ Stages of visual diagnostics
Selection of spare parts: original or analogue
When choosing a replacement for trapezoid wipers It is worth paying attention to catalog numbers. For Skoda Fabia There are several modifications of the mechanism depending on the year of release and body type (hatchback, combi). Incorrectly selected part may not fit the mounts or length of the thrusts.
Original spare part from Skoda It guarantees perfect fit and quality of materials, but it is quite expensive. A good alternative is quality counterparts from proven brands such as Bosch, VAG or specialist wiper manufacturers. Cheap Chinese copies often have weak metal and break quickly.
| Part type | Benefits | Disadvantages |
|---|---|---|
| Original (VAG) | Ideal geometry, durability | High price, long delivery |
| High-quality analogue | Optimal price-quality ratio | It requires careful selection. |
| Cheap analogue | Low cost | Rapid wear, risk of breakage |
| Repair kit | Savings, replacing only the bushings | Requires skills and time to repair |
If you decide to replace only worn sleeves, and not the entire trapezoid, make sure that the kit has all the necessary washers and locking rings. It often happens that old sleeves cannot be removed without damage to the traction, which makes repair impossible and forces you to change the knot entirely.
Buying an original trapezoid or high-quality analogue from well-known brands is an investment in the reliability of wipers for the entire life of the car.
Step-by-step replacement instructions
Replacing the trapezoid is a task of medium complexity, which any car owner with a basic set of tools will cope with. The main thing is to observe accuracy so as not to damage the paint coating of the body and plastic elements of the skin.
First, you need to remove the levers of the janitors. Unscrew the nuts of the mount, but do not tear the lever by force. Use the skipper or gently rock it to knock it off the sheds. Then remove the plastic grille (toad), unscrewing all the locks and bolts. Be careful as the fixtures are often fragile.
1. Disconnect the negative terminal of the battery.2. Remove the nuts of the janitor's levers.
3. Remove the plastic toad linings.
4. Turn off the motor's electrical connector.
5. Unscrew the trapezoid bolts to the body.
6. Remove the trapezoid and install a new one.
The installation of a new trapezoid is done in reverse order. Before the final tightening of the mounting bolts, make sure that the mechanism does not touch the body and moves freely. It is important to correctly install the levers of the wipers in the initial position, so that they stand parallel to the racks of the windshield.
Before removing the old levers, mark their position relative to the shaft slit with a marker. This will help to quickly and accurately expose the wipers after installing a new trapezoid.
โ ๏ธ Attention: When removing toads, plastic clips are often damaged. Keep spare mounts on hand, as old ones can simply break when removed from the seats.
Mechanism lubrication and maintenance
To prolong the life of a new or repaired trapezoid, you need to choose the right lubricant. Conventional engine oil or WD-40 is not suitable for long-term operation in the nodes of windshield wipers friction. They are quickly washed out by water and weathered.
The best solution is a special silicone lubricant or Litol-24 (in moderate amounts). Silicone does not stick to dirt and retains its properties at low temperatures, which is critical for the work of wipers in winter. You need to apply lubrication on the bushes and hinges before assembly.
- โ๏ธ Silicone lubricant does not freeze or crack in the cold.
- ๐ข Lithol-24 provides good sliding, but can attract dust.
- ๐ซ It is forbidden to use oil for sewing machines or motor oil.
Regular maintenance involves cleaning the mechanisms from dirt and sand. In autumn and spring, when there are many reagents and dirt on the roads, it is advisable to inspect the knot and, if necessary, add lubricant through the technological holes, without removing the trapezoid completely.
Using specialized silicone lubricant for trapezoid bushings is the only way to guarantee the quiet operation of wipers in winter.
Frequent maintenance errors
Inexperienced car owners often make mistakes that exacerbate the problem. One of the most common is an attempt to tighten the bolts of the mounting of the bushings, when the plastic is already completely destroyed. This will not eliminate backlash, but only deform the metal thrust, making it unusable.
Another mistake is ignoring the condition of the brushes. Hard, icing or deformed brushes create a tremendous resistance to the trapezoid. Even the ideal trapezoid will quickly fail if it is constantly pressed with frozen gum. Always check the condition of the rubber bands before the start of the season.
It is also not recommended to leave the levers of the wipers raised in a vertical position for a long time. The spring that keeps them pressed against the glass may weaken and the mechanism may skew. If you need to replace brushes, it is better to use the maintenance mode provided in the car settings.
โ ๏ธ Warning: Do not attempt to lubricate the mechanism through the syringe without removing the trapezoid if you are unsure of the design. Lubrication can get on the windshield or electrical contacts, causing problems with the view or short circuit.
FAQ: Frequently asked questions from owners
Can you smear the trapezoids without removing them?
Theoretically, this is possible if there is access to the bushings through the technological holes. But, Skoda Fabia the design often requires removal of the frill for good access. It is better to spend time disassembling it to lubricate all the components correctly and avoid getting oil on the glass.
Why do the wipers not stop in their original position?
This may be due to a malfunction of the contact group inside the gear motor or incorrect installation of the levers after replacing the trapezoid. If the problem occurs after replacement, check the position of the splines on the shaft when installing the arms.
How long does it take to replace a trapezoid on a Fabia?
For an experienced master, this procedure takes about 40-60 minutes. A beginner may need 1.5-2 hours, especially at the stage of removing plastic elements and fixing new levers.
What to do if the motor hums, but the trapezoid does not spin?
Most likely, the gearbox gear inside the motor has sheared off or the trapezoid has jammed so much that the motor cannot overcome the resistance. It is necessary to remove the trapezoid and check its movement manually, and then check the condition of the motor gear.
Do I need to change the entire trapezoid or can the bushings be replaced?
Depends on the degree of wear. If the rods are not bent and there is no corrosion, replacing the repair kit (bushings) is possible and economical. However, it is often simpler and safer to replace the entire assembly to ensure that all connections are free of play.