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Introduction to Bobcat 853 and Its Hydrostatic Pump
The Bobcat 853, introduced in the early 1990s, is a skid-steer loader renowned for its versatility and compact design. It features a hydrostatic drive system, allowing for smooth and precise control of movement and operation. The hydrostatic pump is a critical component of this system, responsible for converting engine power into hydraulic energy to drive the wheels and operate attachments.
Hydrostatic Pump Specifications
The Bobcat 853's hydrostatic pump operates at a flow capacity of 18 gallons per minute (GPM) at 2,750 RPM and 1,150 PSI. For high-flow applications, it can reach up to 24 GPM at the same RPM and pressure. The system's main relief pressure is set at 2,850 PSI, ensuring protection against overpressure situations. Additionally, the auxiliary hydraulic pump provides 6 GPM at 1,150 PSI, suitable for powering attachments requiring hydraulic fluid.
Common Issues and Troubleshooting
Over time, the hydrostatic pump may experience wear and tear, leading to various issues:
Regular maintenance is essential to prolong the life of the hydrostatic pump:
Real-World Experience
A user reported a significant hydraulic leak between the left and right halves of the hydrostatic pump. Upon inspection, it was determined that a gasket failure was the cause. The repair involved removing the engine and pump assembly, a task that required custom tooling due to the unavailability of factory tools. This situation underscores the importance of timely maintenance and the challenges of repairing complex hydraulic systems.
Conclusion
The hydrostatic pump in the Bobcat 853 is integral to its performance and reliability. Understanding its specifications, potential issues, and maintenance requirements can help operators ensure optimal operation and longevity of their equipment. Regular attention to the hydrostatic system can prevent costly repairs and downtime, keeping the loader running efficiently for years.
The Bobcat 853, introduced in the early 1990s, is a skid-steer loader renowned for its versatility and compact design. It features a hydrostatic drive system, allowing for smooth and precise control of movement and operation. The hydrostatic pump is a critical component of this system, responsible for converting engine power into hydraulic energy to drive the wheels and operate attachments.
Hydrostatic Pump Specifications
The Bobcat 853's hydrostatic pump operates at a flow capacity of 18 gallons per minute (GPM) at 2,750 RPM and 1,150 PSI. For high-flow applications, it can reach up to 24 GPM at the same RPM and pressure. The system's main relief pressure is set at 2,850 PSI, ensuring protection against overpressure situations. Additionally, the auxiliary hydraulic pump provides 6 GPM at 1,150 PSI, suitable for powering attachments requiring hydraulic fluid.
Common Issues and Troubleshooting
Over time, the hydrostatic pump may experience wear and tear, leading to various issues:
- Reduced Performance: Symptoms include sluggish movement, unresponsive controls, or erratic operation.
- Hydraulic Leaks: Leaks can occur at seals or joints, often due to worn components or improper maintenance.
- Overheating: Inadequate fluid levels or cooling can cause the pump to overheat, leading to potential damage.
Regular maintenance is essential to prolong the life of the hydrostatic pump:
- Fluid Checks: Regularly monitor hydraulic fluid levels and quality.
- Filter Replacements: Change filters as per the manufacturer's recommendations to ensure clean fluid circulation.
- Seal Inspections: Inspect seals for wear and replace them promptly to prevent leaks.
Real-World Experience
A user reported a significant hydraulic leak between the left and right halves of the hydrostatic pump. Upon inspection, it was determined that a gasket failure was the cause. The repair involved removing the engine and pump assembly, a task that required custom tooling due to the unavailability of factory tools. This situation underscores the importance of timely maintenance and the challenges of repairing complex hydraulic systems.
Conclusion
The hydrostatic pump in the Bobcat 853 is integral to its performance and reliability. Understanding its specifications, potential issues, and maintenance requirements can help operators ensure optimal operation and longevity of their equipment. Regular attention to the hydrostatic system can prevent costly repairs and downtime, keeping the loader running efficiently for years.
