Rear Wiper Motor Issues on the Case 580SL Series 2

[MikePhua]

The Case 580SL Series 2 and Its Cab Electrical System
The Case 580SL Series 2 backhoe loader was introduced in the late 1990s as an upgrade to the original Super L model, offering improved hydraulics, operator comfort, and electrical refinements. With a turbocharged diesel engine producing around 80 horsepower and a robust loader-backhoe configuration, the 580SL Series 2 became a staple in municipal fleets and construction sites across North America. Over 60,000 units were sold globally, and many remain in service today due to their mechanical durability and straightforward maintenance.
One of the more overlooked components in the cab is the rear wiper motor. While not essential for digging or lifting, it plays a critical role in visibility during wet or dusty conditions—especially when operating the backhoe in reverse or during trenching. A malfunctioning wiper motor can compromise safety and slow down operations in adverse weather.
Terminology Notes

• Wiper Motor: An electric motor that drives the wiper arm via a gear mechanism.
  
• Park Position: The resting location of the wiper blade when turned off.
  
• Intermittent Relay: A timed switch that allows wipers to operate in intervals.
  
• Wiper Arm Torque: The rotational force required to move the wiper blade across the glass.
  

Common Symptoms of Rear Wiper Motor Failure
Operators may encounter several issues:

• Wiper does not move when switch is activated
  
• Wiper moves slowly or stalls mid-sweep
  
• Motor hums but arm does not rotate
  
• Wiper blade parks in the wrong position
  
• Fuse blows repeatedly when wiper is used
  

A contractor in Alberta reported that his 580SL’s rear wiper stopped mid-sweep during a rainy trenching job. After checking the fuse and switch, he discovered the motor gear had stripped due to corrosion and over-torque.
Root Causes and Diagnostic Pathways
Rear wiper motor failure can stem from electrical, mechanical, or environmental factors. Key areas to inspect include:

• Power Supply and Ground
  • Corroded terminals or broken wires can prevent current flow
    
  • Solution: Use a multimeter to verify voltage and continuity at the motor connector
    
• Motor Gear Wear
  • Plastic gears inside the motor housing may strip or crack
    
  • Solution: Open motor casing and inspect gear teeth for damage
    
• Wiper Arm Binding
  • Debris or rust at the pivot point can increase resistance
    
  • Solution: Clean and lubricate arm joints, verify free movement
    
• Switch or Relay Fault
  • Intermittent function may be caused by a faulty relay or worn switch contacts
    
  • Solution: Test switch output and replace relay if voltage is inconsistent
    
• Incorrect Installation or Alignment
  

• Wiper arm installed at wrong angle may cause motor overload
  
• Solution: Reinstall arm in proper park position and torque to spec
  

A technician in Texas resolved a rear wiper issue by replacing the motor and adding a dielectric grease to the connector. The wiper resumed full sweep and parked correctly after calibration.
Replacement and Upgrade Recommendations
When replacing the rear wiper motor:

• Choose OEM or high-quality aftermarket units with matching voltage and torque specs
  
• Verify mounting bolt pattern and shaft diameter
  
• Replace wiper arm and blade if worn or bent
  
• Use waterproof connectors and sealant to prevent future corrosion
  
• Test sweep range and park position before final tightening
  

Some operators retrofit their 580SLs with programmable intermittent wiper modules. A crew in Argentina added a delay relay and switch panel, allowing them to adjust sweep intervals during long trenching operations.
Preventive Maintenance and Field Tips
To extend wiper motor life:

• Clean rear glass and wiper blade weekly
  
• Inspect wiring harness for abrasion or pinching
  
• Lubricate pivot points and motor shaft annually
  
• Replace blade every 6–12 months depending on usage
  
• Avoid using wipers on dry or icy glass to reduce motor strain
  

A retired operator in Montana recalled his 580SL’s wiper motor failing during a snowstorm. He used a hand squeegee until the motor was replaced, then added a rubber boot over the motor housing to prevent future moisture ingress.
Recommendations for Fleet Managers and Technicians
To improve reliability and serviceability:

• Document motor model numbers and wiring diagrams
  
• Stock spare motors, blades, and relays for field repairs
  
• Train operators to report wiper performance issues early
  
• Include wiper function in pre-shift inspection checklists
  
• Coordinate with Case support for updated service bulletins
  

A fleet manager in Georgia created a cab electrical checklist including wiper motor amperage draw, switch response time, and blade wear log. This reduced visibility-related downtime and improved safety across his loader fleet.
Conclusion
Rear wiper motor issues on the Case 580SL Series 2 may seem minor, but they directly impact operator visibility and jobsite safety. With proper diagnostics, quality replacement parts, and preventive care, technicians can restore full function and protect the cab’s electrical integrity. In heavy equipment, clear vision is critical—and the rear wiper plays a quiet but vital role in keeping operations moving forward.