Polaris Sportsman 850 High Lifter Problems

The Polaris Sportsman 850 High Lifter is built to conquer mud. Its aggressive tires, high-mounted intakes, and specialized gearing make it a formidable machine in the muck. However, even the most capable ATVs can face challenges, and the Sportsman 850 High Lifter is no exception. Understanding the potential issues you might encounter with this model can save you time, money, and frustration on the trail.

So, You're Thinking About a Sportsman 850 High Lifter? Let's Talk Real Talk.

The Sportsman 850 High Lifter isn't your grandpa's trail machine. It's designed for a specific purpose: deep mud and challenging terrain. Because of this specialized focus, certain issues are more prevalent compared to standard ATV models. We're going to dive into the common problems reported by owners, covering everything from drivetrain woes to electrical gremlins, so you can be prepared if (or when) they arise.

Drivetrain Dilemmas: When the Power Isn't Getting Through

The drivetrain is the heart of any mud machine. It's responsible for transferring the engine's power to the wheels, and in the High Lifter, it's put under immense stress. Here are some common drivetrain issues:

• Belt Slippage and Failure: This is probably the most frequently reported problem. Deep mud creates immense resistance, causing the CVT belt to overheat and slip. This leads to power loss, jerky acceleration, and eventually, belt failure.
  • Why it happens: Excessive heat generated from high loads and low speeds in mud.
  • What to do: Invest in a heavy-duty aftermarket belt designed for mud riding. Consider a clutch kit to optimize belt engagement and reduce slippage. Regularly inspect your belt for wear and tear. Proper clutch maintenance is key.
• Differential Issues: The differentials are responsible for allowing the wheels to rotate at different speeds, which is essential for turning. Mud and water can contaminate the differential oil, leading to premature wear and failure.
  • Why it happens: Water and debris entering through seals, especially after submersion.
  • What to do: Regularly check and change your differential fluid. Use a high-quality synthetic fluid designed for extreme conditions. Inspect the vent lines to ensure they are properly routed and functioning.
• Axle Problems: The axles are the final link in the drivetrain, connecting the differentials to the wheels. They are subjected to tremendous stress in deep mud and can break or bend.
  • Why it happens: Excessive wheel spin followed by sudden traction. Overloading the ATV with heavy mud buildup.
  • What to do: Consider upgrading to stronger aftermarket axles. Avoid excessive wheel spin and abrupt changes in throttle. Regularly inspect your axles for signs of damage.

Electrical Gremlins: When the Lights Go Out (and More)

Electrical issues can be frustrating, especially when you're miles from civilization. The Sportsman 850 High Lifter, like many ATVs, can be prone to electrical problems, especially when exposed to water and mud.

• Water Intrusion: Water can seep into connectors, switches, and other electrical components, causing corrosion and short circuits.
  • Why it happens: Riding in deep water. Pressure washing the ATV without proper precautions.
  • What to do: Use dielectric grease on all electrical connections to prevent corrosion. Regularly inspect and clean electrical components. Consider using waterproof connectors and wiring.
• Sensor Failures: Sensors monitor various engine parameters and can malfunction due to water, mud, or vibration. This can lead to poor engine performance or even a no-start condition.
  • Why it happens: Exposure to harsh environments. Vibration and wear and tear.
  • What to do: Regularly inspect sensors for damage or corrosion. Use a diagnostic tool to identify faulty sensors. Replace faulty sensors with high-quality replacements.
• Battery Problems: The battery is essential for starting the engine and powering electrical accessories. Mud and water can corrode battery terminals and drain the battery.
  • Why it happens: Corrosion of terminals. Parasitic drain from accessories. Infrequent use.
  • What to do: Regularly clean and inspect battery terminals. Use a battery tender to keep the battery charged when the ATV is not in use. Consider upgrading to a higher-capacity battery.

Cooling System Concerns: Keeping Things Cool Under Pressure

The engine of the Sportsman 850 High Lifter generates a lot of heat, especially when working hard in mud. Maintaining a healthy cooling system is crucial to prevent overheating and engine damage.

• Radiator Clogging: Mud and debris can clog the radiator fins, reducing its ability to dissipate heat.
  • Why it happens: Riding in muddy conditions without proper radiator protection.
  • What to do: Regularly clean the radiator fins with a soft brush and water. Consider installing a radiator guard to protect it from debris. Relocating the radiator higher on the machine can also help.
• Fan Malfunction: The cooling fan helps to draw air through the radiator, especially at low speeds. A faulty fan can lead to overheating.
  • Why it happens: Electrical problems. Physical damage to the fan blades.
  • What to do: Regularly inspect the fan for damage and ensure it is operating properly. Check the fan motor and wiring for any issues.
• Coolant Leaks: Leaks in the cooling system can lead to a loss of coolant and overheating.
  • Why it happens: Damaged hoses. Loose connections. Corrosion of cooling system components.
  • What to do: Regularly inspect the cooling system for leaks. Replace damaged hoses and tighten loose connections. Use a high-quality coolant designed for ATVs.

Suspension Woes: Keeping it Smooth (or at Least Trying To)

The Sportsman 850 High Lifter has a robust suspension system, but it can still be susceptible to problems, especially when subjected to the rigors of mud riding.

• Worn Bushings and Bearings: Mud and water can accelerate the wear of bushings and bearings in the suspension system, leading to loose steering and handling.
  • Why it happens: Lack of lubrication. Exposure to abrasive materials.
  • What to do: Regularly grease the suspension components. Replace worn bushings and bearings with high-quality replacements.
• Shock Absorber Issues: Shock absorbers can lose their damping ability over time, leading to a bouncy ride and reduced control.
  • Why it happens: Wear and tear. Damage from impacts.
  • What to do: Regularly inspect shock absorbers for leaks or damage. Consider rebuilding or replacing worn shock absorbers.

General Maintenance is Key: Preventing Problems Before They Start

While the Sportsman 850 High Lifter can be prone to certain issues, many problems can be prevented with proper maintenance. Here are some essential maintenance tips:

• Regularly Wash Your ATV: Washing your ATV after each ride is crucial to remove mud and debris that can damage components.
• Grease All Fittings: Regularly grease all fittings to keep the suspension and other components lubricated.
• Check and Change Fluids: Regularly check and change the engine oil, differential fluid, and coolant.
• Inspect Air Filter: Keep your air filter clean to ensure proper engine performance.
• Store Properly: Store your ATV in a dry place to prevent corrosion.

Frequently Asked Questions About Sportsman 850 High Lifter Problems

• Why does my Sportsman 850 High Lifter keep overheating? Clogged radiator fins and low coolant levels are likely culprits; ensure the radiator is clean and the coolant is at the proper level. Also, check the cooling fan to ensure it is working.

• My belt keeps slipping. What can I do? A heavy-duty aftermarket belt and a clutch kit designed for mud riding can significantly improve belt performance. Proper clutch maintenance is also essential.

• What kind of oil should I use in my differentials? Use a high-quality synthetic oil specifically designed for ATV differentials and extreme conditions. This will help protect against wear and tear.

• How often should I grease the fittings on my ATV? Grease the fittings after every ride in muddy conditions, or at least every few rides in less severe conditions. This will keep the suspension and other components lubricated.

• What is dielectric grease, and why should I use it? Dielectric grease is a non-conductive lubricant that protects electrical connections from corrosion and moisture. It's crucial for preventing electrical problems, especially in wet environments.

The Muddy Bottom Line

The Polaris Sportsman 850 High Lifter is a beast in the mud, but like any specialized machine, it requires attention and care. By understanding the potential problems and implementing proper maintenance practices, you can keep your High Lifter running strong for years to come. Remember that preparedness and proactive maintenance will extend the life of your machine and ensure many more mud-slinging adventures.