Description
Astralpool C71 motor flange 4405011458
The Astralpool C71 motor flange 4405011458 is the original interface part between the motor and the hydraulic body of selected Astralpool
pool pumps. It centres and supports the motor, houses the mechanical seal seat and provides the correct distance and alignment between
the shaft and the impeller for smooth, efficient operation.
Main features of the Astralpool C71 motor flange
- Original Astralpool motor flange for C71 frame motors.
- Precision machined surfaces for accurate motor and pump alignment.
- Integrated seat for the mechanical seal and shaft passage.
- Fixing points matched to compatible pump bodies and motors.
Function in the pump assembly
The motor flange is a structural link between the electric motor and the hydraulic section of the pump. The Astralpool C71 motor flange
4405011458 positions the motor shaft exactly in line with the impeller and diffuser, keeping clearances within design tolerances. It also
supports the mechanical seal that prevents water from travelling along the shaft into the motor.
- Aligns the motor shaft with the impeller for efficient power transfer.
- Holds the stationary seat of the mechanical seal in the correct position.
- Provides a rigid connection that limits vibration and noise.
Compatibility and typical applications
This motor flange is intended for Astralpool pool pumps that use a C71 frame motor and list reference 4405011458 in their exploded view
or spare parts list. It is commonly used in small and medium residential circulation pumps where the motor can be replaced or overhauled
independently from the hydraulic body.
- Suitable for Astralpool pumps equipped with C71 frame motors.
- Designed for residential filtration systems with standard duty cycles.
- Ideal when rebuilding a pump with a new motor and mechanical seal.
When to replace the Astralpool motor flange 4405011458
Although the flange is not in direct contact with pool water, it works under mechanical stress and can be affected by corrosion, mishandling or misalignment over time. A damaged or warped flange can lead to premature seal wear, noise and even motor failure.
- Visible cracks, deformation or broken fixing ears on the flange.
- Corrosion or wear around the mechanical seal seat or shaft opening.
- Misalignment symptoms such as unusual vibration or rapid seal failures.
- Thread damage in the fixing holes that prevents correct tightening.
Installation recommendations
Installing the Astralpool C71 motor flange 4405011458 is normally part of a major pump service or motor replacement. The system must be
isolated electrically and hydraulically before work begins.
- Switch off the power, close valves and drain the pump housing completely.
- Separate the wet end from the motor and remove the existing motor flange.
- Clean the contact surfaces on the pump body and motor face before fitting the new flange.
- Install a new mechanical seal in the flange seat following the correct orientation.
- Bolt the flange to the motor and then to the pump body, tightening screws evenly in a cross pattern.
After reassembly, the impeller should turn freely by hand before the pump is primed and started. Any unusual noise or vibration on first
start up should be investigated immediately.
Good practice for long term reliability
With the Astralpool C71 motor flange 4405011458 correctly installed, a few simple habits help extend the life of both the flange and the
connected components.
- Ensure the pump is mounted on a solid, level base with correct pipe support.
- Avoid overtightening screws that fix the flange to the body and motor.
- Replace the mechanical seal whenever the flange or motor is changed.
- Inspect the flange area during annual maintenance for early signs of corrosion or stress.
By using the original Astralpool C71 motor flange 4405011458 and following good installation practice, compatible pumps recover precise
alignment and stable, quiet operation for many swimming seasons.
