Evaluating External Hydraulic Capabilities on the Case 1845C Skid Steer

[MikePhua]

The Case 1845C and Its Hydraulic Legacy
The Case 1845C skid steer loader, introduced in the early 1990s, became one of the most widely used machines in its class. With a production run that lasted well into the 2000s, it earned a reputation for mechanical simplicity, reliability, and versatility. Powered by a 56-horsepower engine, the 1845C featured a gear-driven hydraulic system capable of delivering approximately 16 gallons per minute (GPM) at around 2250 to 2500 PSI. These specs placed it firmly in the “standard flow” category, suitable for a wide range of attachments but limited in high-demand hydraulic applications.
By the mid-1990s, Case had sold tens of thousands of 1800-series skid steers globally, with the 1845C becoming a staple on farms, construction sites, and rental fleets. Its hydraulic system was designed to support basic implements like buckets, forks, and grapples, but not high-flow tools such as cold planers or large rotary cutters.
Understanding Standard Flow Limitations
Standard flow hydraulics, typically defined as 15–25 GPM at pressures below 3000 PSI, are sufficient for most general-purpose attachments. However, they fall short when powering tools that require sustained torque or rapid blade rotation. On the 1845C, the 16 GPM output means that attachments like grapple buckets and trenchers will function adequately, but mowers and augers may struggle under load.
For example:

• Grapple buckets: Operate well with standard flow, as they require short bursts of hydraulic pressure
  
• Concrete breakers: Perform reliably due to intermittent use and lower flow demands
  
• Ditching attachments: May work, but performance depends on soil type and depth
  
• Rotary mowers: Will spin, but cutting power and speed will be noticeably reduced
  

Operators often compensate by increasing engine RPM to boost hydraulic output, but this approach has diminishing returns and increases fuel consumption.
Terminology Clarification
- Standard Flow: Hydraulic output typically between 15–25 GPM at pressures below 3000 PSI
- High Flow: Enhanced hydraulic output, often 30–40 GPM, used for demanding attachments
- GPM (Gallons Per Minute): A measure of hydraulic fluid volume delivered per minute
- PSI (Pounds per Square Inch): A measure of hydraulic pressure
- Auxiliary Hydraulics: External hydraulic ports used to power attachments
High Flow Retrofit Considerations
Retrofitting high flow hydraulics onto an 1845C is technically possible but rarely practical. It involves:

• Installing a larger hydraulic pump
  
• Upgrading hoses, valves, and fittings to handle increased pressure
  
• Adding a secondary cooler to manage heat
  
• Replacing or modifying the control system to accommodate dual circuits
  

In the 1990s, some operators did pursue high flow conversions, especially for snowblowers and stump grinders. However, the cost and complexity often outweighed the benefits. Today, with modern skid steers offering factory-installed high flow circuits and electronic controls, retrofitting an older machine is generally discouraged unless the unit is in exceptional condition and the operator has fabrication expertise.
Operator Insights and Field Experience
One excavation contractor recalled using an 1845C with a mower attachment in the early 2000s. While the blades spun, the machine bogged down in thick grass, requiring multiple passes. He later upgraded to a newer Case model with 24 GPM standard flow and noticed a dramatic improvement in cut quality and speed.
Another operator used a grapple bucket for clearing brush and found the 1845C’s hydraulics more than adequate. The attachment cycled quickly, and the loader’s compact frame allowed maneuvering in tight spaces. For tasks like debris handling and light trenching, the machine remained a reliable performer.
Recommended Attachments for the 1845C
To maximize hydraulic performance without modification:

• Grapple bucket
  
• Hydraulic forks
  
• Concrete breaker
  
• Trencher (shallow depth)
  
• Ditch cleaning bucket
  
• Post driver (low flow variant)
  

Avoid using:

• Rotary mower (unless cutting light vegetation)
  
• Cold planer
  
• High-capacity auger
  
• Snowblower (unless specifically rated for low flow)
  

Preventive Maintenance for Hydraulic Longevity
To ensure consistent performance:

• Replace hydraulic filters every 250–300 hours
  
• Use manufacturer-recommended hydraulic fluid
  
• Inspect hoses for wear, cracking, or leaks
  
• Monitor fluid temperature during extended use
  
• Clean quick couplers regularly to prevent contamination
  

Some operators install inline pressure gauges to monitor system health and detect drops in output before failure occurs.
Final Thoughts
The Case 1845C remains a capable and dependable skid steer, especially when matched with attachments suited to its hydraulic profile. While it lacks the brute force of modern high-flow machines, its simplicity and durability make it ideal for standard-duty tasks. For operators seeking to run demanding implements, upgrading to a newer model may be more cost-effective than retrofitting. But for grapples, breakers, and trenchers, the 1845C still holds its own—proof that good design never goes out of style.