Tech Tip: How to Inspect UTV/ATV Shock Seals and Suspension

Your Polaris suspension is designed to soak up massive hits, but it relies on a precise balance of oil and high-pressure nitrogen to work. Whether you have basic Bronco shocks or high-end DragonFire Racing or FOX Racing Shox, the seals and internal charge will eventually degrade. Riding on "blown" shocks isn't just uncomfortable—it causes the machine to bounce uncontrollably, which can lead to a rollover or broken drivetrain parts.

Step 1: The "Wet Shaft" Seal Inspection

The most common failure point is the main shaft seal. This seal keeps the hydraulic oil inside the shock body while the shaft moves in and out thousands of times per ride.

• Visual Check: Look at the chrome shock shaft. It should be dry and shiny. If you see a "ring" of oil or if the bottom of the shock is coated in a thick, dark "sludge" of oil and dirt, the seal is blown.
• Pitting and Nicks: Closely inspect the chrome surface of the shaft. If you see tiny pits or scratches (often caused by rocks), those imperfections will shred a new seal immediately.
• The Result: Once the oil leaks out, the shock loses its "damping" ability. The spring will still hold the machine up, but it will bounce like a pogo stick after every bump.

Step 2: Checking Nitrogen Pressure and Fade

Performance shocks use a nitrogen charge (often in a "piggyback" reservoir) to keep the oil from foaming. Over time, this gas can seep out.

• The "Squish" Test: With the machine on a jack and the wheels off the ground, quickly compress the suspension by hand. If you hear a "gurgling" or "squishing" sound inside the shock, the nitrogen has mixed with the oil (cavitation). The shock needs a professional rebuild.
• Temperature Check: After a hard ride, the shock bodies should be warm to the touch. If one shock is cold while the others are hot, that shock isn't doing any work and is likely failed internally.

Step 3: Inspecting Sag and Springs

Even if the seals are dry, your springs can "sack out" over time, especially on heavily loaded Rangers or RZRs with heavy accessories.

• The Measurement: Park on a level surface and measure your ground clearance. Compare this to the factory specs in your manual.
• Spring Crossover: On dual-rate springs, ensure the plastic "sliders" aren't cracked or stuck. If the springs have lost their tension, your suspension will "bottom out" frequently, sending a jarring shock through the frame.

Pro Tip: Protect the Shafts

If you ride in rocky or sandy terrain, consider adding shock "boots" or "guards." These simple plastic shields prevent roost from your front tires from nicking the chrome shafts of your rear shocks. A $20 guard can save you a $400 shock rebuild!

Smooth out your ride and stay in control. Shop Witchdoctors.com for UTV and ATV shocks, replacement springs, and suspension hardware today!