The Hisun 700 UTV, while often praised for its affordability and feature set, isn't without its quirks. Many owners have encountered challenges ranging from minor annoyances to more significant mechanical issues. Understanding these common problems and knowing how to address them can save you time, money, and frustration, allowing you to get back to enjoying your UTV. Let's dive into the most frequently reported Hisun 700 UTV problems and how to tackle them.

Starting Troubles: Why Won't My Hisun Fire Up?

One of the most persistent complaints from Hisun 700 owners revolves around starting issues. This can manifest in several ways, from a slow crank to a complete refusal to start. Diagnosing the root cause is key to getting your UTV back in action.

  • Battery Blues: This is often the first place to look. A weak or dead battery is a common culprit, especially if the UTV has been sitting for a while. Check the battery voltage with a multimeter. It should read at least 12.6 volts when fully charged. If it's lower, try charging it. If it still won't hold a charge, it's time for a replacement. Consider investing in a high-quality AGM (Absorbent Glass Mat) battery for better performance and longevity.

  • Starter Solenoid Woes: The starter solenoid is a small but crucial component that relays power from the battery to the starter motor. If it's faulty, it can prevent the starter from engaging. A telltale sign is a clicking sound when you try to start the UTV. You can test the solenoid by jumping the two large terminals with a screwdriver (exercise extreme caution!). If the starter engages, the solenoid is likely the problem.

  • Loose Connections: Vibrations from off-road use can loosen electrical connections over time. Carefully inspect all battery terminals, ground connections, and wiring harnesses related to the starting system. Clean and tighten any loose connections. Apply dielectric grease to prevent corrosion.

  • Fuel Delivery Issues: A clogged fuel filter or a malfunctioning fuel pump can also prevent the engine from starting. Check the fuel filter for debris and replace it if necessary. You can also test the fuel pump pressure with a fuel pressure gauge. The manufacturer's specifications should be available in your owner's manual or online.

  • Ignition Switch Problems: While less common, a faulty ignition switch can also be the source of starting problems. Try wiggling the key while attempting to start the UTV. If it starts intermittently, the ignition switch may need to be replaced.

Suspension Sensations: A Bumpy Ride or a Broken Down System?

The suspension system is critical for a comfortable and controlled ride, especially when traversing rough terrain. Hisun 700 UTVs can sometimes experience suspension-related issues.

  • Worn Bushings: Bushings are rubber or polyurethane components that cushion the suspension joints. Over time, they can wear out, leading to excessive play, clunking noises, and poor handling. Inspect the bushings regularly for cracks, tears, or excessive wear. Replacement bushings are relatively inexpensive and can significantly improve ride quality.

  • Shock Absorber Leaks: Leaking shock absorbers indicate a loss of damping fluid, which means they're no longer effectively controlling the suspension movement. Look for oil residue on the shock absorbers. Leaking shocks should be replaced. Consider upgrading to aftermarket shocks for improved performance and durability.

  • Broken Springs: While less frequent, springs can break, especially if the UTV is consistently overloaded or used aggressively. Visually inspect the springs for cracks or breaks. A broken spring will obviously need to be replaced.

  • A-Arm Issues: Check the A-arms for bends or damage. Off-road impacts can easily bend these components which will cause alignment and handling issues. Inspect A-arms for straightness and integrity.

Cooling Catastrophes: Overheating and How to Prevent It

Overheating can cause serious engine damage, so it's crucial to address cooling system problems promptly. The Hisun 700 UTV, like any internal combustion engine vehicle, is susceptible to overheating if the cooling system isn't functioning properly.

  • Radiator Clogs: Mud, debris, and insects can clog the radiator fins, reducing its ability to dissipate heat. Regularly clean the radiator with a soft brush and a garden hose. Avoid using a pressure washer, as it can damage the delicate fins.

  • Low Coolant Levels: A low coolant level is a common cause of overheating. Check the coolant level in the radiator and the overflow reservoir. Top up as needed with the correct type of coolant (usually a 50/50 mix of antifreeze and distilled water).

  • Faulty Thermostat: The thermostat regulates the flow of coolant through the engine. If it's stuck closed, it can prevent coolant from reaching the radiator, leading to overheating. You can test the thermostat by placing it in a pot of boiling water. It should open fully. If it doesn't, replace it.

  • Water Pump Problems: The water pump circulates coolant through the engine. A failing water pump can reduce coolant flow, leading to overheating. Listen for unusual noises coming from the water pump area. A failing water pump may also leak coolant.

  • Stuck Fan Motor: The cooling fan helps to dissipate heat when the UTV is stationary or moving slowly. If the fan isn't working, it can cause overheating. Check the fan motor and wiring for damage. You can also test the fan motor by applying direct power to it.

Electrical Enigmas: Wiring Gremlins and Short Circuits

Electrical problems can be frustrating to diagnose, but a systematic approach can help you track down the issue.

  • Blown Fuses: A blown fuse is often the first sign of an electrical problem. Check the fuse box for blown fuses and replace them with the correct amperage rating. If the fuse blows again immediately, there's likely a short circuit in the wiring.

  • Wiring Harness Damage: Rodents, vibration, and abrasion can damage the wiring harness, leading to short circuits or open circuits. Inspect the wiring harness for cuts, abrasions, or loose connections. Repair or replace any damaged wiring.

  • Faulty Sensors: Various sensors provide data to the engine control unit (ECU). A faulty sensor can cause a variety of problems, including poor performance, stalling, or difficulty starting. Use a diagnostic scanner to read the error codes and identify any faulty sensors.

  • Grounding Issues: A poor ground connection can cause a variety of electrical problems. Ensure that all ground connections are clean, tight, and free from corrosion.

Drivetrain Dilemmas: Transmission Troubles and Axle Issues

The drivetrain is responsible for transferring power from the engine to the wheels. Problems in this area can significantly impact the UTV's performance.

  • Transmission Slippage: Transmission slippage occurs when the transmission doesn't properly engage the gears, resulting in a loss of power. This can be caused by low transmission fluid, worn clutch plates, or a faulty valve body. Check the transmission fluid level and condition. If the fluid is low or dirty, change it.

  • Axle Breakage: The axles transfer power from the differential to the wheels. They can break if the UTV is subjected to excessive stress, such as hard landings or rough terrain. Inspect the axles for cracks or bends. Replace any damaged axles.

  • CV Joint Failure: CV (constant velocity) joints allow the axles to articulate as the suspension moves. They can fail if they're not properly lubricated or if they're subjected to excessive stress. Listen for clicking or popping noises coming from the CV joints. Replace any damaged CV joints.

  • Differential Problems: The differential allows the wheels to rotate at different speeds when turning. Problems with the differential can cause noise, vibration, or difficulty turning. Check the differential fluid level and condition. If the fluid is low or dirty, change it.

Frequently Asked Questions

  • Why does my Hisun 700 keep stalling? Stalling can be caused by a variety of factors, including a clogged fuel filter, a faulty sensor, or a vacuum leak. Check the basics first, like fuel and air filters, then consider using a diagnostic scanner.

  • How often should I change the oil in my Hisun 700? It's generally recommended to change the oil every 100 hours of use or every six months, whichever comes first. Always refer to your owner's manual for specific recommendations.

  • What type of oil should I use in my Hisun 700? Consult your owner's manual for the recommended oil type and viscosity. Using the wrong oil can damage your engine.

  • My Hisun 700 is making a loud clunking noise when I accelerate. What could it be? This could be due to worn-out suspension components, a loose drivetrain component, or a failing CV joint. Inspect these areas carefully to pinpoint the source of the noise.

  • Where can I find parts for my Hisun 700? Parts can be found online through various retailers, as well as at some local powersports dealers. Always verify the part number to ensure compatibility.

The Takeaway

While the Hisun 700 UTV might present some challenges, understanding these common issues and knowing how to diagnose and address them can save you considerable time and money. Don't hesitate to consult your owner's manual and online resources for further assistance. Regular maintenance is key to a long and enjoyable ownership experience.