Forklift Chain Wheel Bearing 780308 Mast Bearings 780308K 780308K3 Forklift Bearing 780308K4 780308K5 Size 40X120X23mm

UJK Brand Forklift Bearings: A Comprehensive Overview

UJK is a trusted manufacturer specializing in high-performance replacement bearings for the material handling industry. Our comprehensive product line is engineered to meet the rigorous demands of forklift applications, ensuring durability, reliability, and superior performance under heavy loads and in challenging environments.

1. Main Guide Roller Bearings

• Description: These are among the most critical bearings on a forklift, guiding the carriage smoothly along the mast channels. They are typically heavy-duty, stud-type cam followers or yoke rollers designed to withstand high radial loads and shock loads.

• Common Types & Features: Often feature through-hardened steel, precision-ground surfaces, and integral seals for contamination protection.

• Example Models (Varies by mast size): UJK MR 10525, UJK MR 15530, UJK MR 20640 (Model numbers often indicate dimensions, e.g., 20x64x40mm).

2. Sprocket (Chain Wheel) Bearings

• Description: These bearings are located in the lift mechanism's sprockets, facilitating smooth rotation as the chains raise and lower the carriage. They are crucial for precise mast control and are subject to high forces.

• Common Types & Features: Typically deep groove ball bearings or needle roller bearings. They are characterized by high precision, robust construction, and often come with C3 internal clearance to manage thermal expansion.

• Example Models: UJK 6205-2RS, UJK 6306-2RS, UJK NJ 206 EC3 (Standard metric sizes with seals for protection).

3. Side Roller Bearings

• Description: Mounted on the sides of the carriage or mast, these rollers stabilize the forklift carriage, preventing lateral sway and ensuring smooth, aligned travel within the mast structure.

• Common Types & Features: Usually cam followers or double-flanged guide rollers. They are designed with a thick outer ring to handle high impact loads and often have a crowned outer surface for optimal load distribution.

• Example Models: UJK CR 18x42x38, UJK CF 20x47x32 (Dimensions: Outer Dia. x Width x Bore).

4. Combination Roller Bearings

• Description: A highly integrated component that combines the functions of a main guide roller and a side roller into a single, compact unit. This simplifies mast design, reduces the number of parts, and enhances overall rigidity.

• Common Types & Features: Feature a complex design with a large-diameter main roller and one or two smaller side rollers mounted perpendicularly on a single stud and housing.

• Example Models: Model numbers are often specific to OEM mast designs (e.g., UJK COMBI-45210 for a specific Toyota/TCM model).

5. Slewing Rings (Rotational Connections)

• Description: Used in electric reach trucks, order pickers, and rotary forklift attachments, these are large-diameter bearings that enable smooth 360-degree rotation between the upper and lower frames under combined axial, radial, and moment loads.

• Common Types & Features: Single-row ball or cross-roller slewing rings. They are characterized by their large internal gear or external gear for drive mechanism engagement and sealed raceways.

• Example Models: UJK SBR 100.40.1280.046 (Example nomenclature: Series + Bore Dia. + Outer Dia. + Gear code).

6. Full Complement Roller Bearings

• Description: Designed for extreme radial load capacity in compact spaces. Unlike caged bearings, they utilize the maximum number of rollers, making them ideal for slow oscillating movements and very heavy loads in applications like hydraulic pumps, steering mechanisms, or pivot points.

• Common Types & Features: No cage allows for maximum roller count. They require robust sealing and are typically used in low-to-moderate speed applications.

• Example Models: UJK NJ 206 EMC3, UJK NF 207 EMC3 (Standard series with increased capacity and internal clearance).

Why Choose UJK Forklift Bearings?

• Premium Materials: Manufactured from high-carbon chromium steel (GCr15/52100) through-hardened for superior wear resistance and load capacity.

• Advanced Sealing: Integrated contact seals (2RS/LLU) or labyrinth designs protect against dirt, debris, and moisture, significantly extending service life.

• Precision Engineering: Consistent quality and dimensional accuracy ensure perfect fitment and optimal performance, matching or exceeding OEM specifications.

• Comprehensive Range: A complete portfolio covering virtually all domestic and international forklift brands like Toyota, Linde, Jungheinrich, Crown, Yale, Hyster,