Product Overview

The 4J8479 (4J-8479) Hydraulic Vane Pump Cartridge is a high-quality, heavy-duty replacement component designed for various Caterpillar (CAT) equipment. This 21-gallon capacity cartridge is engineered to meet or exceed OEM specifications, ensuring reliable performance and extended service life in demanding hydraulic systems.

As the core component of a hydraulic vane pump, this cartridge group includes essential rotating parts such as the rotor, vanes, cam ring, and bearings. It is responsible for generating the necessary flow and pressure of the hydraulic fluid, playing a crucial role in the efficient operation of your machinery.

Product Parameters & Advantages

Key Specifications:

• Part Number: 4J8479, 4J-8479
• Capacity: 21 Gallons (approximately 79 Liters/Min)
• Type: Hydraulic Vane Pump Cartridge
• Design: Available in 12-vane designs for industrial applications (optimized for quiet operation) and 10-vane designs for mobile applications (higher pressure and wider speed range).
• Components Included: Assembled rotor, vanes, cam ring, inlet/outlet plates, and seals.
• Pressure Rating: Typically rated for high pressures (e.g., up to 3000 psi).
• Speed Rating: Capable of high speeds (e.g., up to 2700 RPM).

Superior Advantages:

• Optimized Performance: Acts as a filter element, removing contaminants to maintain fluid cleanliness and prevent damage. It also helps regulate flow rate and pressure, optimizing pump performance and preventing excessive pressure drops.
• Durable Construction: Features a sealed cartridge housing designed to withstand high pressures and temperatures, ensuring robust and long-lasting operation.
• Easy Maintenance: The cartridge is independent of the shaft, allowing for convenient changes in flow capacity and field servicing without needing to remove the entire pump from its mounting.
• Precision Engineering: Ensures proper alignment of the rotor and vanes for efficient pumping action, contributing to the reliable operation of the hydraulic unit.

Applicable Equipment & Application Scenarios

This hydraulic vane pump cartridge is specifically designed for a wide range of Caterpillar (CAT) heavy equipment, ensuring seamless integration and optimal performance. It is crucial for hydraulic systems that demand high efficiency and reliability.

Compatible CAT Equipment Models:

• Loaders: 920, 930
• Tractors/Dozers: D7G, 613G, 621, 7A, 7S, 7U, 7, 57
• Wheel Tractors: 613C II, 615C II, 613C
• Soil Compactors: 815B, 815F, 815F II
• Wheel Dozers: 814F, 814F II, 814B
• Landfill Compactors: 816B, 816F, 816F II
• Other models within the 173B, 183, 193, 528, 528B, 530B, FB518 series.

Typical Application Scenarios & Case Analysis:

The 4J8479 hydraulic vane pump cartridge is vital across various industries where heavy machinery and robust hydraulic systems are deployed. Its functions are critical for maintaining the operational integrity and efficiency of equipment in diverse settings.

• Construction and Earthmoving: In applications like excavating, grading, and material handling (e.g., with CAT Loaders and Dozers), the cartridge ensures consistent hydraulic pressure for precise control of implements, lifting, and steering. For instance, in a large-scale road construction project, a reliable hydraulic vane pump cartridge in a CAT D7G Dozer ensures powerful and accurate blade movements for efficient earthmoving, preventing downtime due to hydraulic failures.
• Mining Operations: Heavy-duty mining equipment relies on powerful hydraulics for operations like hauling, crushing, and drilling. The cartridge provides stable fluid flow, enabling continuous and high-pressure performance of hydraulic cylinders in challenging mining environments. A case in point could be a CAT 621 Wheel Tractor-Scraper operating in a mine, where the consistent hydraulic power provided by the vane pump cartridge is essential for quickly loading and dumping material, thereby maximizing productivity.
• Waste Management: In landfill compactors (e.g., CAT 816F), the hydraulic system is crucial for applying immense pressure to compress waste. The cartridge's ability to maintain optimal pressure and flow ensures effective compaction, extending the life of the landfill and improving operational efficiency.
• Industrial and Manufacturing: Beyond heavy equipment, similar vane pump cartridges are utilized in hydraulic systems for plastic injection molding machinery, rubber machinery, casting machinery, and machine tools. These applications demand precise and reliable hydraulic power for consistent production cycles.

Related & Similar Products

While the 4J8479 is a specific part, the hydraulic vane pump cartridge family is extensive, with various models designed for different flow rates, pressures, and applications. Many aftermarket manufacturers offer compatible and high-quality alternatives or similar cartridges for a broad range of equipment.

Commonly Related CAT Vane Pump Cartridges:

• CAT OEM Equivalent & Aftermarket Replacements:
  • 4J8492, 4K4835, 7J0581 (often direct replacements or similar applications).
  • 4J7949, 4T3196, 6E5831, 7J0561, 7J7416, 9J5080 (various capacities and compatible with different CAT models).
  • Other CTP (Costex Tractor Parts) cartridge kits such as 1U3953, 3G1266, 3G1267, 3G2195, and many more, designed for specific CAT equipment like 183B, 950, 963, 973, 613G, D350E, 814, 815, 816, 930R, etc.
• Other Vane Pump Cartridge Brands/Series (for similar applications):
  • Vickers V/VQ Series: Widely used in industrial and mobile applications, these series (e.g., V10, V20, V2010, V2020, 20V/VQ, 25V/VQ, 35V/VQ, 45V/VQ) offer various displacement codes (GPM) and are common in machinery that requires quiet operation or higher pressure.
  • Parker Denison: Another prominent manufacturer of hydraulic vane pumps and cartridges.

These similar products serve comparable functions across various heavy equipment and industrial machinery, providing hydraulic power for systems like steering, braking, lifting, and tool operation.

Installation & Maintenance: Common Issues and Solutions

Proper installation and regular maintenance are crucial for the longevity and optimal performance of hydraulic vane pump cartridges. Addressing common issues proactively can prevent costly downtime and premature failures.

Common Issues & Troubleshooting:

• Loose Fasteners:
  • Problem: If fasteners holding the pump or cartridge are not tight enough, vanes can float, leading to accelerated wear and reduced efficiency.
  • Solution: Regularly check and tighten all fasteners around the hydraulic vane pump using appropriate torque specifications.
• Fluid Contamination:
  • Problem: This is a major cause of premature failure (up to 80% of failures). Solid particles, debris, or contaminants can damage internal components.
  • Solution: Ensure hydraulic fluid is clean and free of contaminants. Implement regular fluid filtration and replacement schedules. Always use high-quality, recommended hydraulic fluid.
• Improper Lubrication / Low Fluid Level:
  • Problem: Insufficient lubrication can cause premature wear of port plates and other moving parts. Low fluid levels can lead to cavitation and pump damage.
  • Solution: Verify the hydraulic fluid reservoir is at the proper level. Remove any blockages that prevent proper lubrication.
• Shaft Seal Leakage:
  • Problem: If the shaft seal loses contact or is damaged, hydraulic fluid can leak, leading to pressure loss and system inefficiency.
  • Solution: Inspect the shaft seal for leaks. If leakage is observed, replace the shaft seal and re-install the pump correctly.
• Damaged or Worn Dowel Pin:
  • Problem: A worn or broken dowel pin can affect the alignment and proper operation of the pump's internal components.
  • Solution: Examine the dowel pin for any wear or damage. Replace it if necessary.
• Parallel Marks on Port Plate:
  • Problem: This indicates that the vanes are not spinning together uniformly, causing the liquid to flow in bands rather than a continuous stream.
  • Solution: This often suggests internal wear or misalignment of components within the cartridge. A thorough inspection or cartridge replacement may be required.

General Maintenance Tips:

• Periodically inspect all hoses and connections for tightness and signs of wear.
• Regularly check the hydraulic system's pressure gauge for correct readings.
• Turn off power before inspecting for clogs in lines or valves.
• Adhere strictly to the manufacturer's installation and maintenance guidelines for the specific pump and cartridge model.