08-19-2025, 10:10 AM
Overview of the Case 1845C Model
The Case 1845C, a popular skid steer loader from the early 1990s, is known for its reliable hydraulic system controlling the boom, bucket, and auxiliary attachments. Auxiliary hydraulics provide power for work tools like augers, sweepers, or hydraulic hammers, typically controlled by an independent spool or foot pedal.
Common Auxiliary Hydraulic Issues
Several operators noted that auxiliary hydraulic failure in Case 1845C was often linked to a sticky foot pedal that partially engaged the valve, ironically robbing flow from the boom. Another frequent cause was electrical wiring issues causing valves or pumps to stop working mid-operation, leading to sudden power loss.
One dedicated mechanic documented restoring a 1845C with complete auxiliary loss by replacing a worn auxiliary valve spool and re-routing wiring harnesses, resulting in full system recovery and improved tool responsiveness.
Maintenance Recommendations
The Case 1845C auxiliary hydraulic problems commonly stem from mechanical valve spool issues, pedal linkage faults, electrical wiring defects, or hydraulic leaks. A systematic approach combining mechanical, electrical, and fluid diagnostics typically resolves these issues. Upkeep of pedals, valves, and wiring are keys to consistent auxiliary hydraulic performance, reinforcing the 1845C's reliability in demanding tasks.
The Case 1845C, a popular skid steer loader from the early 1990s, is known for its reliable hydraulic system controlling the boom, bucket, and auxiliary attachments. Auxiliary hydraulics provide power for work tools like augers, sweepers, or hydraulic hammers, typically controlled by an independent spool or foot pedal.
Common Auxiliary Hydraulic Issues
- Auxiliary hydraulic system may lose functionality or have diminished flow despite the main pumps running correctly.
- Operators may experience sticky or partially engaged foot pedals robbing hydraulic flow from the main lift circuit, causing sluggish boom or load response.
- Sudden loss of hydraulic power affecting boom, bucket, or drive functions can occur due to electrical faults or internal hydraulic component failure.
- Auxiliary valve or spool malfunction or improper plumbing can result in no oil flow to attachments.
- Faulty Auxiliary Valve or Spool: The dedicated auxiliary hydraulic valve is often mounted separately; internal sticking or seal failure can block flow.
- Blockages or Leaks in Hydraulic Lines: Small but persistent leaks reduce hydraulic pressure and fluid volume available for auxiliary operation.
- Electrical Wiring Problems: Broken wires to hydraulic filters, pressure sensors, or solenoids may cause pumps or valves to shut down as a safety measure.
- Pedal Linkage or Mechanical Faults: Binding pedals can partially engage circuits, sending flow away from main lifts.
- Pump or U-joint Wear: Tandem pumps must be inspected for smooth shaft rotation and proper alignment to ensure flow generation.
- Hydraulic Oil Condition: Contaminated or low fluid levels severely affect system performance.
- Inspect and clean or replace the auxiliary valve spool, seals, and mounting brackets as needed.
- Examine and repair any leaking hoses or fittings in the auxiliary circuit; use proper hydraulic grade hose rated for pressure.
- Test electrical continuity on wires related to the auxiliary hydraulic system to confirm no breaks or shorts exist.
- Lubricate and adjust the foot pedal and linkage assemblies to ensure full and free travel.
- Flush or replace hydraulic oil and filters if contamination is suspected or system feels sluggish.
- Verify tandem pump condition by checking shaft rotation and absence of unusual noises or vibrations.
- Auxiliary Hydraulic Valve: Controls hydraulic fluid flow to non-standard equipment attachments.
- Tandem Pump: Dual hydraulic pump arrangement sharing a common shaft, providing multiple flow circuits.
- Spool: Sliding valve element within a hydraulic control valve directing oil flow paths.
- Foot Pedal Linkage: Mechanical linkage transmitting operator input to hydraulic valve control.
- Hydraulic Filter: Device filtering impurities from hydraulic fluid to protect components.
Several operators noted that auxiliary hydraulic failure in Case 1845C was often linked to a sticky foot pedal that partially engaged the valve, ironically robbing flow from the boom. Another frequent cause was electrical wiring issues causing valves or pumps to stop working mid-operation, leading to sudden power loss.
One dedicated mechanic documented restoring a 1845C with complete auxiliary loss by replacing a worn auxiliary valve spool and re-routing wiring harnesses, resulting in full system recovery and improved tool responsiveness.
Maintenance Recommendations
- Routine inspection and lubrication of pedal linkages reduce mechanical binding risks.
- Frequent hydraulic oil and filter changes according to OEM guidelines maintain clean fluid environments.
- Periodic electrical harness inspection avoids hidden wire faults that impair system operation.
- Quick response to minor leaks prevents cascading loss of pressure and system damage.
The Case 1845C auxiliary hydraulic problems commonly stem from mechanical valve spool issues, pedal linkage faults, electrical wiring defects, or hydraulic leaks. A systematic approach combining mechanical, electrical, and fluid diagnostics typically resolves these issues. Upkeep of pedals, valves, and wiring are keys to consistent auxiliary hydraulic performance, reinforcing the 1845C's reliability in demanding tasks.
