Reviving the ASV 4810 Track Loader with Practical Diagnostics

[MikePhua]

The ASV 4810 and Its Unique Track System
The ASV 4810 was part of a pioneering generation of compact track loaders developed by All Season Vehicles (ASV), a company founded in Minnesota in the early 1990s. ASV gained recognition for its patented Posi-Track undercarriage system, which used rubber tracks and multiple bogie wheels to distribute ground pressure evenly. This design allowed machines like the 4810 to operate in soft terrain, snow, and swampy conditions where traditional wheeled loaders would sink or stall.
With a turbocharged Perkins diesel engine producing around 80 horsepower, the 4810 was engineered for forestry, landscaping, and utility work. Its hydraulic system powered a wide range of attachments, and its low ground pressure—often under 4 psi—made it ideal for sensitive environments. However, as these machines age, electrical and hydraulic quirks begin to surface, especially in units with limited service history.
Terminology Annotation

• Posi-Track: ASV’s proprietary track system using rubber belts and multiple bogie wheels for traction and flotation.
  
• Hydrostatic Drive: A transmission system using hydraulic fluid to power drive motors, allowing variable speed and direction.
  
• Glow Plug Relay: An electrical relay that activates the glow plugs for cold starting in diesel engines.
  
• Solenoid Valve: An electrically actuated valve that controls hydraulic flow or fuel delivery.
  

Startup Issues and Electrical Troubleshooting
One common issue with the ASV 4810 is failure to crank or start, especially in cold weather or after long storage. The glow plug relay plays a critical role in preheating the combustion chamber. If the relay fails, the engine may crank but not fire, or it may struggle to start in low temperatures.
Diagnostic steps include:

• Listen for the relay click when the key is turned to the preheat position.
  
• Test voltage at the glow plug terminals—should read 10–12V during activation.
  
• Inspect relay terminals for corrosion or loose connections.
  
• Replace the relay with a heavy-duty unit rated for diesel applications.
  

In one case from a snow-clearing crew in Montana, an ASV 4810 refused to start during a blizzard. The glow plug relay had failed silently, and the operator bypassed it temporarily with a manual switch. A permanent fix involved installing a marine-grade relay with weatherproof housing.
Hydraulic Lockout and Solenoid Behavior
Another frequent complaint is loss of hydraulic function—no lift, tilt, or auxiliary flow. The culprit is often a failed solenoid valve or a disconnected safety circuit. The ASV 4810 uses a seat switch and lap bar sensor to enable hydraulic flow. If either sensor fails, the system locks out to prevent unintended movement.
Troubleshooting steps:

• Check for 12V at the solenoid coil when the seat and lap bar are engaged.
  
• Inspect the solenoid for magnetism—use a screwdriver to feel for pull.
  
• Test continuity across the seat switch and lap bar sensor.
  
• Replace damaged connectors with sealed automotive-grade plugs.
  

A technician in Georgia found that mice had chewed through the seat switch wires, disabling the loader arms. After repairing the harness and sealing it with split loom tubing, the machine returned to full function.
Drive Motor Lag and Hydraulic Contamination
The hydrostatic drive motors on the 4810 are sensitive to fluid quality and pressure. If the machine hesitates or jerks during travel, the issue may be low hydraulic charge pressure or contaminated fluid.
Preventive measures:

• Replace hydraulic fluid every 500 hours or annually.
  
• Use ISO 46 or manufacturer-recommended fluid with anti-foaming additives.
  
• Replace filters with OEM or high-efficiency equivalents.
  
• Inspect suction lines for cracks or air leaks.
  

In one restoration project, a neglected 4810 had blackened fluid and clogged filters. After a full flush and filter change, drive response improved dramatically.
Undercarriage Maintenance and Track Tension
The Posi-Track system requires regular inspection to prevent premature wear:

• Check track tension weekly—should deflect 1–2 inches under moderate pressure.
  
• Grease bogie wheels and inspect for play or noise.
  
• Clean debris from undercarriage daily to prevent buildup.
  
• Replace worn track belts before cords are exposed.
  

Operators in sandy environments report accelerated wear on bogie seals. Switching to synthetic grease and installing aftermarket seal guards can extend service life.
Recommendations for ASV Owners and Technicians

• Keep spare relays, solenoids, and seat switches in stock.
  
• Document all electrical repairs and wire colors for future reference.
  
• Use dielectric grease on all connectors to prevent corrosion.
  
• Train operators to recognize early signs of hydraulic lag or electrical failure.
  
• Partner with ASV parts suppliers or salvage yards for legacy components.
  

Closing Reflections
The ASV 4810 remains a capable and nimble track loader, especially in terrain where others falter. Its unique undercarriage and compact design make it valuable, but its electrical and hydraulic systems demand attention. With methodical diagnostics and preventive care, the 4810 can continue to clear snow, shape landscapes, and navigate mud—proving that smart design and steady hands keep even aging machines in the game.