Removing a Steering Wheel on a Case 590M and Similar Machines

[MikePhua]

The Case 590M and Its Operator Interface
The Case 590M backhoe loader, introduced in the early 2000s, was part of Case Construction’s M Series—a line known for improved hydraulic performance, cab comfort, and serviceability. With a turbocharged diesel engine producing over 90 horsepower and a robust loader-backhoe configuration, the 590M became a popular choice for municipalities, contractors, and utility crews.
One of the more overlooked aspects of machine maintenance is the operator interface—specifically, the steering column and wheel assembly. Whether you're troubleshooting horn switches, turn signal wiring, or simply replacing a worn-out wheel, steering wheel removal can be deceptively tricky.
Why Steering Wheel Removal Is Necessary
Accessing components beneath the steering wheel is often required for:

• Diagnosing horn switch failures
  
• Repairing turn signal stalks or wiring
  
• Replacing worn bushings or bearings in the column
  
• Installing aftermarket accessories like tilt kits or joystick conversions
  

In older machines, corrosion and tight tolerances can make removal a challenge, especially if the wheel has never been pulled since factory assembly.
Tools and Techniques for Safe Removal
The most effective way to remove a steering wheel is with a dedicated steering wheel puller. These tools are designed to apply even pressure to the hub while protecting the shaft threads. While specialty pullers like the #CAS10486 exist for certain models, most standard automotive pullers will work with minor adaptation.
Recommended tools:

• Steering wheel puller kit with multiple bolt patterns
  
• Penetrating oil (e.g., PB Blaster or Kroil)
  
• Air chisel with pointed bit (optional for stubborn hubs)
  
• Socket wrench and extension
  
• Safety glasses and gloves
  

Steps for removal:

1. Remove the center cap or horn button to expose the retaining nut
   
2. Loosen the nut but leave it threaded slightly to protect the shaft
   
3. Apply penetrating oil to the splines and let it soak for 30–60 minutes
   
4. Attach the puller and tighten evenly
   
5. If stuck, use upward knee pressure on the wheel while tapping the shaft center with an air chisel or rubber mallet
   
6. Once loosened, remove the nut and lift the wheel off
   

One operator in Illinois shared that after two days of soaking and failed attempts, he finally freed the wheel using a combination of knee leverage and a scream of triumph—startling his neighbor but saving the day.
Avoiding Damage to the Column and Shaft
It’s critical not to hammer directly on the threaded shaft, as this can mushroom the threads or damage the steering gear. Always leave the nut partially threaded during impact or pulling operations. If using an air chisel, aim for the center of the shaft—not the threads—and use short bursts.
Common mistakes to avoid:

• Using pry bars between the wheel and dash
  
• Applying heat near plastic or wiring
  
• Over-tightening puller bolts and stripping threads
  
• Ignoring signs of shaft bending or spline wear
  

If the wheel resists removal after multiple attempts, consider removing the entire column for bench work. This allows better access and reduces the risk of collateral damage.
Horn Switch and Turn Signal Repairs After Removal
Once the wheel is off, you’ll typically find:

• A horn contact ring or spring-loaded switch
  
• Turn signal stalk wiring routed through the column
  
• Dust seals and bearing races
  

Inspect for:

• Broken wires or corroded terminals
  
• Worn contact surfaces
  
• Loose stalk mounts or cracked housings
  

Replacement parts are often available through Case dealers or aftermarket suppliers. If the horn switch is faulty, test continuity with a multimeter before replacing. For turn signals, verify that the stalk returns properly and that the wiring harness is intact.
Service Manuals and Long-Term Value
Investing in a factory service manual is highly recommended. These manuals provide exploded diagrams, torque specs, and wiring schematics that simplify repairs and prevent guesswork. For machines like the Case 590M, the manual also includes hydraulic flow charts, electrical troubleshooting guides, and component cross-references.
Benefits of owning a manual:

• Accurate part identification
  
• Step-by-step procedures
  
• Safety warnings and torque specs
  
• Long-term resale value for the machine
  

One technician in Ontario noted that his manual paid for itself within a month—saving hours of labor and preventing a costly misdiagnosis of a steering column fault.
Conclusion
Removing the steering wheel on a Case 590M may seem like a minor task, but it requires patience, the right tools, and a bit of mechanical finesse. Whether you're chasing down a horn issue or refreshing the operator controls, proper technique ensures the job gets done without damaging critical components. With a puller, some penetrating oil, and a dash of persistence, even the most stubborn wheel can be coaxed free—often with a satisfying shout of victory.