Hydraulic pullers - what are the differences and what are they used for?

What are hydraulic pullers? These are devices used to dismantle various parts and assemblies that are pressed in the outer and inner diameters and are fitted with interference. Often, these devices are equipped with two or more than three "legs" (supports) made of high-strength carbon steel. In order to achieve greater hardness and strength, these tools undergo additional heat treatment.

What can they do?

For today, hydraulic pullers can dismantle such parts as:

• Bearings;
• Propellers;
• Kingpins;
• Pulleys;
• Bushings;
• Couplings;
• Flanges;
• Gear transmissions ;
• Railway wheels and disks of heavy-duty vehicles, including tractors ;
• brake discs;
• Crankshafts.

In which areas are applied?

Often, the main area of application of these tools are car-care centers and auto-farms. In addition, the puller pivot hydraulic is widely in demand at various repair sites of industrial enterprises.

Varieties

There are four main types of devices with a hydraulic drive:

• Devices with built-in pump.
• With remote pump.
• Pullers hydraulic clamp type.
• Universal devices.

Let's start with the pullers with built-in hydraulic pump. Their principle of work is as follows. The pump, built into the body of the puller, drives the hydraulic cylinder with a metal rod mounted on the end. The latter, in turn, sets in motion special grippers, as a result of which the necessary part is removed. For such a puller the hydraulic price is very diverse - about 5 000 - 30 000 rubles, depending on the characteristics of load capacity, diameter and depth of capture.

Devices with a remote pump have in their design an additional special high-pressure hose that can be designed for pressure up to 70 mPa. This mechanism can have different lengths depending on the level and volume of work performed. Due to its small size, it is often used in hard-to-reach places. Technical characteristics are almost identical to the previous version with a built-in pump.

Hydraulic clamping type pullers are used in those cases when it is necessary to remove a hard-to-remove part, that is, which can not be dismantled by devices with a standard gripper. At the same time, these tools can work with devices ranging in diameter from 3.5 to 42 centimeters. The maximum force applied to the used part is simply enormous - up to 35 tons!

The latter type is universal hydraulic lifters. In their set can include both clamps and clamp. They are used most often for the dismantling of impellers, pulleys, gears and other devices, planted with interference. Typically, the use of this hydraulic puller allows you to dismantle the part without any damage that all of the above mentioned devices can provoke.