CV Boot Service Guide for the 2002 Polaris Xplorer 400 4X4 4x4 Utility ATV
Shop parts for a 2002 Polaris Xplorer 400 4X4 ATV.
Why CV Boots Fail on the Xplorer 400 4X4
On the 2002 Polaris Xplorer 400 4X4, CV boots protect the joints on both the front and rear axles—four positions in total. A utility ATV in regular work use exposes all four boot positions to conditions that accelerate wear beyond what recreational mileage alone would cause. Sustained torque loads during hauling or plowing, mud that coats the boot exterior with abrasive material, water submersion that tests the clamp seals, and impact from rocks and debris during field or trail work all contribute to boot wear.
All four boot positions age through the same UV degradation process regardless of operating conditions. The rubber compound hardens over time, losing the elasticity the boot needs to flex without cracking at the fold points. A boot that feels supple in warm weather may crack during a cold-weather work session when the rubber is at its stiffest. On the Xplorer 400 4X4, a boot failure at any of the four positions means grease loss and contamination entry that begins wearing the joint behind it from the first ride after the tear.
As a 4WD machine, the Xplorer 400 4X4 drives both the front and rear wheels. CV boots are present at both axle sets—two boots at the front and two at the rear. All four positions should be inspected and serviced together whenever one is found to be damaged.
Identifying a Damaged CV Boot
A failed CV boot on the 2002 Polaris Xplorer 400 4X4 announces itself through grease on nearby components before it causes audible symptoms. When a boot tears at the front axle, grease from the rotating axle lands on the inner wheel face, the rotor, the caliper, or the front frame near the axle. A rear boot failure produces the same pattern at the rear wheel. CV grease is thick, dark, and adhesive—it doesn’t look like mud or road film—and it builds up with each ride after the boot tears. Any grease deposit in these locations on the Xplorer 400 4X4 warrants an immediate inspection.
Front boot failures on the Xplorer 400 4X4 often produce a clicking or popping noise during slow-speed turns under load—particularly noticeable at or near full steering lock. Rear boot failures more commonly show up as a clicking or clunking sound during acceleration or under load rather than during turning. Either noise alongside grease deposits means the joint behind the boot has sustained wear and needs evaluation alongside the boot replacement. With the wheel removed and the axle exposed, work each boot by hand while rotating the axle and look for tears, cracks, stiff fold areas, and gaps at the clamp edges.
On the Xplorer 400 4X4, all four CV boot positions—front inner, front outer, rear inner, rear outer—use the same inspection and replacement process. Check all four when servicing any one of them.
Tools and Parts for the Replacement
CV boot replacement on the 2002 Polaris Xplorer 400 4X4 requires: floor jack and two jack stands; axle nut socket in the correct size for the Xplorer 400 4X4; a calibrated torque wrench; snap-ring pliers for the differential-end retaining clip; boot clamp pliers or an ear-crimp tool; and shop rags. Each boot position needs its own kit including the replacement boot, both clamp bands, and the correct quantity of CV grease. CV grease is a specialized molybdenum-based compound that maintains its lubricating film under the high contact pressures inside a CV joint—it’s not interchangeable with standard bearing grease or chassis lube.
Work over a drain pan to capture old grease during removal. Contaminated grease from a torn boot is abrasive and needs to be fully cleared from the joint before new compound goes in. MotoSport.com stocks CV boot kits and axle assemblies for the Xplorer 400 4X4.
Removing the Axle and Old Boot
Raise the 2002 Polaris Xplorer 400 4X4 on jack stands and remove the wheel on the side being serviced. Remove the cotter pin and axle nut. Separate the outboard axle spline from the hub by pushing the shaft inward—use a hub puller on the Xplorer 400 4X4 if the spline fit is tight. At the inboard end, compress the snap ring at the differential with snap-ring pliers and pull the axle free. Lay it on a clean surface, cut both clamp bands, and slide the damaged boot off. At the front axle on the Xplorer 400 4X4, steering components may need to be repositioned for clearance before the axle can be fully withdrawn.
Inspecting the CV Joint
With the boot off the 2002 Polaris Xplorer 400 4X4, clean old grease from the joint and articulate it through its full range—compression, extension, and full angular rotation. The joint should move smoothly and consistently throughout. Roughness or grinding at any point in the range indicates bearing wear that repacking won’t resolve. Hold the shaft and push the outer housing in non-articulating directions—any clunking or play outside the designed articulation means the axle needs replacement rather than just a new boot on the Xplorer 400 4X4.
Repacking and Installing the New Boot
Clean every internal surface of the CV joint on the 2002 Polaris Xplorer 400 4X4—housing, bearing balls, inner race—before adding fresh grease. Slide the replacement boot onto the shaft before reconnecting the joint. Work the CV grease from the Xplorer 400 4X4’s kit in by hand, rotating the housing to distribute it through all bearing pockets. Use the full quantity. Seat the boot with both ends in the clamp grooves, crimp both clamps fully, and verify neither can rotate. MotoSport.com stocks CV boot kits for this ATV.
Reinstallation and Verification
Push the inboard axle end into the differential on the 2002 Polaris Xplorer 400 4X4 until the snap ring seats positively. Confirm it’s locked with a hand-pull. Guide the outboard spline into the hub, install the axle nut, and torque to the Xplorer 400 4X4’s specification. Secure with a new cotter pin or re-stake the nut. Reinstall the wheel and torque the lug nuts. Lower the Xplorer 400 4X4 and cycle the steering and suspension through their full ranges to verify boot clearance. A brief test ride confirms the axle is seated and the boot is holding. MotoSport.com stocks CV boot kits and axle assemblies for this ATV.
Related Shopping Categories
Shop CV Joints for a 2002 Polaris Xplorer 400 4X4 ATV.
Shop Axles for a 2002 Polaris Xplorer 400 4X4 ATV.
Shop Lubricants & Solvents for a 2002 Polaris Xplorer 400 4X4 ATV.
Shop Wheel Bearings for a 2002 Polaris Xplorer 400 4X4 ATV.
Shop Skid Plates for a 2002 Polaris Xplorer 400 4X4 ATV.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your ATV's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.
