Polaris 3900 Series Cleaners Gearbox Assembly | 39-200

Polaris 39-200 Gearbox Assembly – OEM Replacement for Polaris 3900 Sport / P39 Pressure Pool Cleaner

The Polaris 39-200 is a complete gearbox assembly designed for the Polaris 3900 Sport (and Polaris P39) pressure-side pool cleaner. The gearbox contains the internal gears and bearings that transfer water-driven power into smooth wheel drive and consistent cleaner movement. Replacing a worn gearbox is one of the most effective fixes for drive problems such as slipping, clicking, poor traction, or reduced forward movement.

Key Features

• Part Number: 39-200
• Part Type: Gearbox assembly
• Cleaner Compatibility: Polaris 3900 Sport, Polaris P39 (verify by your cleaner parts diagram)
• Function: Transfers internal drive power to the wheels for consistent movement and coverage
• Includes: Gearbox assembly with internal gears/bearings (complete drive module)

Common Signs You Need a New Gearbox

• Cleaner moves intermittently, stalls, or won’t drive consistently
• Clicking, grinding, or “skipping” sounds from the drive area
• Wheels slip under load (especially when climbing or turning)
• Cleaner performance is poor even after checking pressure, hose leaks, and a clean wall screen

Installation Notes

• Turn off the booster pump and remove the cleaner from the pool before servicing.
• Install the gearbox in the same orientation as the original and ensure all drive connections seat fully.
• While open, inspect related wear items (tires, bearings, axles, and drive components) to prevent repeat issues.
• After reassembly, verify wheels turn smoothly and the cleaner tracks normally in the pool.

Related Products

• Polaris 3900 Sport Parts
• Polaris P39 Parts
• Polaris 3900 Sport Rebuild Kits
• Polaris 3900 Sport Tires
• Polaris 3900 Sport Wheel Bearings
• Polaris 3900 Feed Hose & Hose Parts
• Polaris 3900 Back-Up Valve
• Polaris Wall Fitting Screens

Installation & Maintenance Tips

• Before replacing the gearbox, confirm proper booster pump pressure and check the wall fitting screen for clogs.
• Small hose leaks can mimic gearbox issues—inspect feed hose sections and swivels for spraying or pinholes.
• Rinse the cleaner after heavy debris events; grit and sand accelerate wear on moving parts.
• If the cleaner is still sluggish after gearbox replacement, inspect tires and wheel bearings for drag or binding.