Fleck Drv Assm, 3150, 3900 Upr, Sys 5or7

The Fleck Drive Assembly for 3150 and 3900 upper, System 5 or 7 (FL60057-01), is a complete drive module for these high-capacity Fleck control valves. The drive assembly combines the motor, gears, and cam mechanism that step the valve through service and its multi-stage regeneration sequence, making it the mechanical heart of the control head. Supplied as a single, integrated unit, it restores the whole drive in one installation rather than piece by piece.

At roughly 7 pounds, this is a substantial assembly built for the demanding duty these large valves see in commercial and high-flow applications. It is configured for the upper drive on System 5 or System 7 setups using the 3150 and 3900 platforms, so confirm your configuration before ordering.

• Complete drive assembly for Fleck 3150 and 3900 upper
• Configured for System 5 or System 7 applications
• Integrates motor, gear train, and cam in one module
• Genuine Pentair Fleck component, about 7.0 lbs
• Restores full mechanical cycle control on high-capacity valves
• Efficient alternative to replacing multiple worn drive parts

When a full drive assembly is needed

Replacing the entire drive assembly makes the most sense when multiple drive components have worn together, when the gear train or cam is damaged, or when troubleshooting points to widespread mechanical failure rather than a single part. On large valves that have run for years, the motor, gears, and cam often reach the end of their service lives around the same time, so a complete module both saves labor and ensures everything in the drive is fresh and properly matched.

Because these valves frequently run large softening or filtration systems serving commercial sites or high-demand homes, restoring reliable drive operation quickly is important to keep treated water flowing and avoid costly downtime. Symptoms of a failing drive include stalling mid-cycle, grinding or clicking noises, hesitation between positions, or incomplete regeneration that erodes water quality over time.

When installing, ensure the assembly mounts squarely and the cam indexes correctly with the valve's positions so the cycle timing is accurate. Disconnect power and place the valve in bypass before service, and verify smooth operation through a full cycle once the system is back in service.