Reviving a Case 1835B Skid Steer Through Systematic Troubleshooting

[MikePhua]

The Case 1835B and Its Mechanical Simplicity
The Case 1835B skid steer loader was introduced in the early 1980s as part of Case Corporation’s push into compact equipment. With a gas-powered Continental engine and chain-driven hydrostatic transmission, the 1835B was designed for reliability and ease of service. Case, founded in 1842, had already established itself as a leader in agricultural and construction machinery, and the 1835B became a popular choice for landscapers, farmers, and small contractors. Tens of thousands of units were sold across North America, and many remain in operation today due to their mechanical simplicity and robust design.
Unlike modern skid steers with electronic controls and diagnostic ports, the 1835B relies on direct mechanical linkages, analog gauges, and manual levers. This makes it ideal for hands-on troubleshooting but also demands a clear understanding of its hydraulic and fuel systems.
Initial Assessment and Fuel System Checks
When a newly acquired 1835B fails to start, the first suspicion often falls on the fuel system. In one case, the previous owner claimed the engine wasn’t getting fuel, though no formal diagnosis had been made. The new owner began by draining the fuel tank and inspecting the lines.
Recommended steps:

• Remove the fuel line from the carburetor and crank the engine to check for flow
  
• If fuel is present, rebuild the carburetor to eliminate internal blockages
  
• If no fuel reaches the carb, disconnect the line from the pump inlet and test suction
  
• Use a hand vacuum pump to prime the line if necessary
  
• Replace the fuel pump if suction is weak or inconsistent
  
• Clean the tank thoroughly to remove sediment and varnish
  

Terminology:

• Carburetor: A device that mixes air and fuel for internal combustion
  
• Fuel pump: A mechanical or electric component that delivers fuel from the tank to the carburetor
  
• Suction test: A method to verify fuel line integrity and pump function
  

In one field case, a technician discovered that the fuel pump diaphragm had hardened over time, reducing output. Replacing the pump restored flow and allowed the engine to start.
Hydraulic System Precautions and Safety
The 1835B uses three hydraulic pumps—two for drive motors and one for loader functions. These pumps rely on fluid pressure to operate, and running the engine without hydraulic fluid can cause catastrophic damage. In a documented scenario, the operator had drained the hydraulic fluid to clean the radiator and undercarriage but considered starting the engine before refilling.
Critical warnings:

• Never start the engine with hydraulic fluid drained
  
• Refill the reservoir before cranking to protect pump internals
  
• Block the wheels off the ground to prevent unintended movement
  
• Understand that the machine has no true “neutral” gear—motion is controlled by hydraulic flow
  

Terminology:

• Hydraulic pump: A device that converts mechanical energy into fluid pressure
  
• Drive motor: A hydraulic motor that powers the wheels or tracks
  
• Neutral bar: A mechanical linkage that centers the control levers to stop movement
  

One retired quarry mechanic emphasized that starting without fluid could destroy all three pumps, leading to a repair bill exceeding $2,000. He recommended topping off the system and bleeding air before any engine tests.
Electrical and Ignition System Refresh
For gas-powered models, ignition components are often overlooked. Spark plugs, wires, and coil condition all affect startup reliability. As part of a full refresh, the following steps are advised:

• Replace spark plugs with OEM-rated equivalents
  
• Inspect plug wires for cracks or corrosion
  
• Clean and gap plugs to manufacturer specs
  
• Test ignition coil output with a multimeter
  
• Verify battery voltage and starter solenoid function
  

In one restoration, the operator found that the spark plug wires had been chewed by rodents, causing intermittent spark. Replacing the wires and cleaning the coil terminals resolved the issue.
General Maintenance and Startup Sequence
A structured approach to reviving a dormant 1835B includes:

1. Drain and clean fuel tank
   
2. Replace fuel lines and pump if needed
   
3. Rebuild or replace carburetor
   
4. Change engine oil and filter
   
5. Refill hydraulic fluid and inspect hoses
   
6. Reinstall radiator and check coolant level
   
7. Replace spark plugs and test ignition
   
8. Block wheels and test startup safely
   

Additional recommendations:

• Inspect air filter and replace if clogged
  
• Check tire pressure and condition
  
• Grease all pivot points and loader arms
  
• Verify throttle and choke linkage movement
  

Conclusion
Troubleshooting a Case 1835B skid steer requires a blend of mechanical intuition, safety awareness, and methodical inspection. From fuel delivery to hydraulic integrity, each system must be addressed before attempting startup. With careful attention to detail and respect for the machine’s design, even a neglected 1835B can be brought back to life—ready to dig, lift, and haul once again. In the world of compact loaders, simplicity is strength, and the 1835B proves that old iron still has work to do.