Gear pullers are tools used mainly by mechanics in the maintenance of cars, motorcycles, or other motor vehicles, in particular when the situation requires the removal of bodies that are difficult to extract otherwise, for example, bearings or males with a broken or rusty thread. These are very demanding and delicate activities at the same time, since a wrong use of a gear puller or the choice of a wrong tool can cause very expensive damages.
For this reason, on the market there are many types of gear pullers, distinguished by use, the component to be extracted and the difficulty of the operation. The assortment in the catalog includes three macro categories: mechanical gear pullers, hydraulic gear pullers and manual gear pullers.
The mechanical extractors, together with the hydraulic ones, are those used for the most demanding extractions, thanks to their sturdy structure, equipped with internal mechanisms that allow to give more strength. They also have an ideal body to work in tight spaces. The mechanical gear puller consists of a central screw that runs by screwing on a plate, which is equipped, in most cases, with two or three arms that are fixed or hooked to the body to be extracted. The large gripping area of the arms is very useful for quickly disassembling gears, pulleys, ball bearings, etc.
In addition, other features also contribute to give strength and stability to these gear pullers: for example, the extremely flat tip of the arms, so as to ensure greater grip, or the self-locking arms, also typical of hydraulic gear pullers, which assures that the gear puller does not slide under pressure, or even the structure itself of the gear puller, suitable for working in confined spaces.
The choice of the right type of mechanical puller depends on the pulling force needed. There is a lot of difference, in fact, depending on the size and wether there are two or three arms. In fact, because the three-arm pullers distribute the pulling force optimally with respect to the two-arm gear pullers, these should be the preferred choice whenever there is sufficient space, in order to make less effort during the operation. If you plan to use it to extract components of different sizes, my advice is to buy the series of 3 or 7 gear pullers.
Another example of gear pullers suitable for demanding work is the hydraulic puller. These gear pullers use a hydraulic pressure mechanism. Through an internal mechanism that works with hot oil or heat, it is in fact possible to exert very high forces. It must be remembered, however, that these types of gear pullers also require maintenance. After use, remember to remove the pressure to avoid damage to the seals.
Bearing gear pullers are very common among hydraulic gear pullers, although in the simplest forms they can also be manual. These gear pullers are also designed to allow increased bearing life within applications due to installation, removal and repair procedures. In fact, the bearings can be removed either because they are worn out or because they may need to be revised or repaired. It is therefore very important to use quality tools that allow not only to remove the bearings but also to leave them in conditions that can be reused.
Among the most used bearing pullers we find those for wheel hubs, designed to perfectly match bearings subject to weathering and lack of lubrication.
For the removal of the bearings, instead of gear pullers, rudimentary methods are sometimes used, such as striking the ring nut with an aluminum chisel to unblock it and slide it along the axis of the hub. However, these methods are quite dangerous, as they risk damaging the other mechanical parts as well as, of course, yourself. For this reason, and to save effort, I strongly recommend the use of these gear pullers.
Spherical bearings are similar to regular bearings. They are also called bushings, sliding bearings or plain bearings. Unlike these, however, instead of sliding two parts together, they allow the parts to be joined together. You need a specific type of gear pullers to extract these components, and it is called, precisely, gear pullers for spherical plain bearings, designed to adapt perfectly to these tools and remove them without difficulty. They are available in the both universal version, adaptable to any type of spherical joint, or indicated to operate on certain parts, such as spherical joints of suspensions, transverse rods or stabilizers.
Finally, another professional tool used for the removal of bearings, is the percussion gear puller, consisting of internal expanders that once inserted into the bearing, are widened by the screwing of an inner cone.
Among the manual gear pullers, the tapered gear pullers are very common, used for the removal of any type of screws, studs and pieces that broke during the threading. The choice of this type of gear puller should be made based on the diameter and the number of unloading grooves of the male needing removal. Since diameter is a determining attribute, USAG also offers conical gear pullers in series of 5, 6 or 8.
To conclude, I want to remind you that the purchase of a tool is to be considered an investment, not an expense. In fact, it is crucial to use the correct type of gear puller depending on the component you are going to extract, to avoid the risk of more damage than savings. Many people prefer to always use the same gear puller for any operation, or convince themselves they are able to extract components without gear puller. Sometimes it's possible, but most times absolutely not!
Finally, regardless of the type of gear puller used, remember to always choose quality tools, as they will allow you to always work in complete safety: in our catalog you can find only top quality tools by the best brands.