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COMPONENTS

 

TRACK LINKS

Berco has given priority to the significant requirement of reducing pin and bushing friction wear in their chains.
These components, track bushings in particular, are of fundamental importance to chain durability and are therefore manufactured by Berco on the basis of a specific integral process using the most modern design and production systems.

Track bushings have a surface hardness of Rockwell C 60, a case depth hardness of Rockwell C 50 (from 1.5 to 3.5 mm depending on size), tempered ends (depending on chain type) and a core hardness of Rockwell C 40. Track pins have a surface hardness of Rockwell C 60 and a case depth hardness of Rockwell C 50 (from 2.5 to 7 mm depending of size).

 

PINS AND BUSHINGS

 

 

Berco has given priority to the significant requirement of reducing pin and bushing friction wear in their chains.
These components, track bushings in particular, are of fundamental importance to chain durability and are therefore manufactured by Berco on the basis of a specific integral process using the most modern design and production systems.

Track bushings have a surface hardness of Rockwell C 60, a case depth hardness of Rockwell C 50 (from 1.5 to 3.5 mm depending on size), tempered ends (depending on chain type) and a core hardness of Rockwell C 40. Track pins have a surface hardness of Rockwell C 60 and a case depth hardness of Rockwell C 50 (from 2.5 to 7 mm depending of size).

 

SEALGROUPS

This seal system, which according to experience has proved to be the most advantageous, is used on all the Berco Sealed chains. It consists of simple spring steel washers of high hardness (Rockwell C 50) which, when compressed in the link counterbore, assure a perfect seal. The limited thickness of these washers allows an excellent matching of pin and bushings. On normally abrasive grounds, this system increases the chain life by 20-30%.

 

SHAFTS

 

 

The alloy steel gives toughness to the drop forged shafts. Precise final machining, performed with sophisticated Flexible Manufacturing Systems (FMS), maintains a perfect fit. Induction hardened surfaces in contact with bushings ( Rockwell C 60 ), carefully machined, extend bushing life to a maximum.

 

 

 

 

 

 

TRACK BOLTS

All Berco bolts are forged, cup-headed and roll-threaded, giving exceptional resistance to tensile stress as well as longer life. Berco nuts fit the bolt holes perfectly, thus giving the maximum grip, while their square shape makes assembly and disassembly easier.

The mechanical characteristics of Berco bolts correspond to grade 12.9 to European Specifications (unit breaking load 1200 to 1400 N/sq.mm).

 

 

 

 

 

SEAL

Berco seal groups are a result of many years of experience associated with the production of undercarriage components. The combination of three geometries and wide dimension ranges, two versions of sealing rings and three different rubber compounds for the elastic rings, provide a complete answer for sealing applications where rotation is involved.
The different geometries are named: "LT, "LL" and "IL".

  • The "LT" type has a load ring with a torodal cross section and is recommended when the radial opening for the seal is limited;

  • The "LL" type with its rhomboidal cross section load ring has its application when the space in the axial direction is limited;

  • The "IL" type with inverted rings is particularly suitable for high rotation speed.

The sealing rings can be provided in standard version (coated alloy steel rings with lapped mating surfaces and surface hardness Rockwell C 65) or heavy duty version. The heavy duty version is made from special castings with high percentage of chromium and molybdenum resistant to all types of corrosion and oxidation. They are subjected to special heat treatment processes in order to achieve the highest hardness values (Rockwell C 68), optimizing, in this way, durability and wear resistance.

As far as rubber compound is concerned, three types are proposed by Berco:

  • standard, suitable for a temperature range from -15C up to 100C (5F up to 212F);

  • semiarctic, for temperatures ranging from -40C up to 100C (-40F up to 212F);

  • arctic, in case of extreme application temperatures from -55C up to 165C (-67F up to 329F. In this case, the load rings are made out of silicone rubber.

The Berco Technical Department is always ready to assist you with any information regarding the application, installation or geometrical data for its seals and all inquiries are encouraged and welcome.

 

 

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