Grease Point Confusion on the Case 590SN Backhoe Loader
The Case 590SN is a high-performance backhoe loader widely used in roadwork, utility trenching, and site preparation. Its robust hydraulic system and durable linkage design make it a favorite among operators who demand reliability and ease of maintenance. However, some users have noticed that certain pivot points—especially on the loader arms and control linkages—lack visible grease fittings (zerk fittings), raising concerns about whether these joints are being properly lubricated.
This absence is not a manufacturing oversight. It reflects a deliberate design choice by Case engineers to incorporate sealed, non-greasable pins in specific locations. These pins are intended to operate without routine lubrication, relying instead on internal bushings and seals to maintain smooth movement over their service life.
Why Some Pins Are Designed Without Grease Fittings
Non-greasable pins are increasingly common in modern construction equipment. They typically feature:
• Self-lubricating bushings made of composite materials like PTFE or nylon
• Sealed ends to prevent ingress of dirt, water, and debris
• Pre-lubricated surfaces during assembly
• Reduced maintenance intervals and simplified service routines
These pins are ideal for locations that are hard to reach or subject to minimal movement. However, they do have a finite lifespan. Once the internal bushing wears out, the entire pin assembly may need to be replaced.
Real-World Wear and Field Repairs
A technician in Kentucky shared a case where a Case loader’s control arm had excessive play. Upon inspection, the bushing and spacer tube were completely worn out, and the pin had no grease fitting. After replacing the components, the loader returned to normal operation. Five years later, the same joint showed signs of wear again—less severe, but still requiring attention.
This illustrates that even sealed pins need periodic inspection. While they don’t require grease, they are not immune to wear, especially in high-cycle applications or abrasive environments.
How to Identify Grease Points and Maintain Proper Lubrication
For operators unfamiliar with the Case 590SN’s layout, here are some tips:
• Consult the official operator’s manual and service guide, which includes diagrams of all lubrication points
• Inspect each pivot point for a grease fitting—some may be recessed or hidden behind guards
• Feel for residual grease around joints to determine if they’ve been serviced
• If no fitting is present and the joint is sealed, it’s likely a non-greasable pin
Maintenance recommendations:
• Inspect all pivot joints every 250 hours for looseness or wear
• Check bushings and pins every 500 hours, especially in high-load areas
• Avoid pressure washing directly on sealed joints to preserve seals
• If converting to greasable pins, ensure proper fitting installation and grease regularly
Industry Trends and Manufacturer Philosophy
Manufacturers like Case, Volvo, and JCB have increasingly adopted sealed pin designs to reduce maintenance time and improve reliability. Some models even feature centralized lubrication systems or remote grease banks. While this simplifies daily service, it also demands a shift in operator awareness—visual inspection becomes more important than grease gun routines.
The downside is that wear can go unnoticed until performance degrades. Operators must be trained to recognize early signs of bushing failure, such as increased play, noise, or uneven movement.
Conclusion
The Case 590SN’s use of non-greasable pins in certain joints is a reflection of modern engineering aimed at reducing maintenance and improving uptime. While these joints don’t require routine greasing, they still demand regular inspection and timely replacement when wear occurs. Understanding the difference between sealed and greasable joints—and knowing where to look—ensures your machine stays tight, responsive, and ready for work. In heavy equipment, lubrication isn’t just about grease—it’s about knowing what needs it, and what doesn’t.
