With frequent, intensive use of mowers, the gearbox can begin to warm up or make sounds uncharacteristic of its normal operation, for example, a gnash. It indicates that the mechanism must be lubricated. If this is not done in time, then more serious problems will arise (for example, the gears will wear out quickly, and you will need to replace them), up to jamming. With the gear mechanism, there are also other failures. Repair and lubrication gear can be done independently. for this, you need to familiarize yourself with the features of these works and stock up on some of the available tools.
Trimmer gear unit.
A trimmer gearbox is a knot that transmits the rotational movement of the motor shaft to a knife or fishing line. It locates at the lower end of the trimmer rod. The gear unit is also designed to reduce the speed of the trimmer motor.
The mechanism is dependent on the model of the mowers of several gears rotating at high speed. As a result, they heat up due to intense friction. If there is not enough lubrication, or there is none at all, then the process leads to severe overheating and failure of parts, and, accordingly, the need to carry out complex repairs.. The transmission unit should be lubricated in time.
Reducers of modern trimmers of different models from different manufacturers differ from each other in design and size seat. It happens:
The most common diameters of round seats are 24, 25.5 and 26 mm.
Trimmer equip gearboxes with different types of gear:
- conical;
- worm;
- spiroid;
- cylindrical;
- planetary;
- wave;
- combined.
The drive shaft and gearbox are heavily loaded trimmer assemblies that are highly susceptible to wear. Between them, the movement is transmitted due to the adhesion of the gear teeth, located at different angles to each other. Effectively gear only works if there is no mechanical damage. In this case, the mechanism should not overheat, otherwise it may be jammed.
The main malfunction of the gearbox and how to eliminate them.
With the gearbox of an electric or gasoline trimmer various failures occur. The most frequent of them are presented in the table below. You can also find the causes of their occurrence and methods of elimination.
Bearings are destroyed due to the use of unsuitable lubricant or because of its absence. Also, their damage causes severe operating conditions trimmer and a hit of foreign particles of a material (for example, the broken metal teeth of mechanical transfers) because the integrity of anthers is broken.
To remove the bearing, you need to disassemble the gearbox and use special puller. If not, then you can try to do it with a hammer with a preset. In this case, work should be done carefully so as not to damage the seat. Using the pre-heating method for shooting a bearing is not recommended. It is because the metal may lose the required performance characteristics.
If the knife ceases to rotate under load or even stands still, this is accompanied by an uncharacteristic sound.
Most of the problems of the gearbox can be easily fixed by hand. Replaced parts are encouraged to purchase “native”, designed for the model used motokos.
Trimmer gear lubricant.
Gear lubrication should be carried out regularly in accordance with the recommendations set out in operating instructions used model.
This should also be done if:
- new gears were installed;
- atypical sounds from the gearbox during trimmer operation;
- knives spin hard.
In addition to the gearbox, it is also necessary to regularly lubricate the trimmer shaft. This is the norm for proper care of the device.
With constant use of a trimmer, its gear mechanism is under pressure from grass stuck to the knives, dirt, or due to a change in torque. The lubricant must be of high quality to extend the life of the gearbox.
Used types of grease.
When choosing a lubricant, you must consider the following factors:
- the degree of adhesion of the composition with the metal node;
- product brand;
- lubricant consumption gear.
Famous manufacturers, for example, Stihl, Husqvarna and others, except for trimmers, release and lubricant to them. Such products not only reduces wear, but also protects the metal gears from corrosion. Therefore, for motokos from these brands it is better to use their own lubricating products.
If the composition used for lubrication has excellent adhesion, it is practically not squeezed out of the gearbox through the gaps.
Different models of grease consumed in different ways. This is largely determined by the intensity of the use of motokos and the heating of the transmission mechanism. It is considered that a lubricant is sufficient if the temperature of the gearbox during operation does not exceed 40 ° C.
For consistency, trimmer lubricants can be:
- liquid
- semi-fluid
- hard
- plastic
In terms of composition, the following types of lubricants are in demand:
- graphite, significantly reducing friction, resulting in improved gear rotation;
- lithium, which are also excellent anticorrosive composition, saturated with additives increasing the wear resistance of the metal without harmful substances;
- universal, high-purity mineral oils and performance-enhancing components.
Examples of suitable lubricants are Champion EP-0, Gear Grease OREGON, Oleo-Mas, Azmol 158, Litol.24. You should also pay attention to the advice of manufacturers on this issue and use the materials they offer. You can buy them in specialized outlets.
Algorithm of self-lubrication gear.
To carry out the lubrication of the transmission mechanism of its preliminary disassembly is not needed. A special hole has already been inserted into the device for this purpose.
In addition to gears during lubrication, attention should be paid to the following elements of the mechanism:
- bearing assembly;
- flywheel and doggie coil starter.
Fill the oil or make a solid lubricant through the grease box, closed with a screw.
At the same time perform actions in the following sequence:
- the gearbox body is cleaned of dirt and sticky grass;
- using the appropriate tool (often it comes with a trimmer) unscrew the plug;
- the selected lubricant is introduced into the technological open hole from a tube, or using a syringe, as shown in the photo below;
- screw the cork in place.
When making lubricant, you need to rotate the knife so that it evenly distributes over the teeth of the moving gears.
If for any reason the gearbox needs to be disassembled, the old lubricant must be removed entirely from the entire surface of the gears and the housing, shaft, and only then use a new one. The disassembled mechanism is conveniently lubricated with stable compounds.
It is required to lubricate the transfer unit at least once a year, but it is recommended to do this every 20 hours after intensive use of the mowers. If the first signs of malfunctions with the mechanism appear, the lubricant should be applied as soon as possible.
How to replace a trimmer gearbox: an action algorithm.
To replace the gearbox with a similar part from the same manufacturer, it must first be disassembled and removed from the rod.
They act according to the following algorithm:
- loosen the clamping bolts located under the transmission mechanism;
- using round nose pliers, remove two corkscrew rings;
- using a puller, the bearings are driven from the driven and driven shafts;
- then assemble the mechanism, in the reverse order installing all parts.
If the puller is not at hand, then you can try carefully knock down bearings. When they become attached and do not budge at all, you can heat them with an industrial hair dryer (at a temperature of 600 ° C) and remove them.
Assembling a gear assembly is more comfortable than disassembling it. You may need only a light tapping hammer for planting parts in place. After assembly, be sure to check that the driven shaft rotates by hand.
When there is a need to replace the transmission unit with a non-original part, then you should consider their interchangeability.
This should take into account:
- rod diameter (this parameter is often 25.4 or 26 mm);
- drive shaft parameters. the shape of the docking point and diameter (its common value is 8 mm);
- option for attaching protection.
If the considered parameters coincide, then it will be possible to install parts from other models.
Timely lubrication of the gearbox will ensure its continued operation without repairs. Also, modern materials well protect the metal from corrosion, increase its durability. The choice of choice should be given to the lubricant recommended by the manufacturer of the trimmer in use. If such compositions are not available for purchase, then the considered or other suitable analogs should be used. When it is necessary to disassemble the mechanism when carrying out repairs, this should be done carefully so as not to damage individual parts.