Description
Hydraulic pump for the electric folding roof for Peugeot 307 CC
This hydraulic pump is designed to operate the electric folding roof of the Peugeot 307 CC. It supplies hydraulic pressure to the roof actuators and control valves, enabling smooth opening and closing of the retractable hardtop. Frequently referenced by part code 8446S4, this unit is a common replacement item for worn or leaking roof hydraulic systems on the 307 CC and is intended for professional garages and experienced DIY mechanics who carry out roof system repairs.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: Peugeot 307 CC
- Product Codes: 8446S4
- Additional Numbers: NFP
Function
The pump provides the hydraulic pressure necessary to move the roof rams and operate the roof valve block. An electric motor drives a small hydraulic unit with an integrated reservoir and valves; the pump works together with the roof control unit and position sensors to perform the sequenced roof open/close cycles. The system runs on the vehicle 12V electrical supply.
Typical Application
Intended for the Peugeot 307 CC convertible. The unit is typically mounted in the boot/boot liner area and connected to the roof hydraulic lines and an electrical connector. Because this item is often searched by part number, listing 8446S4 in sales or service documentation helps mechanics and DIY customers locate the correct replacement quickly.
Installation Recommendations
- Work In A Safe Environment: Park on a level surface, engage parking brake and disconnect the negative battery terminal before starting work.
- Support The Roof Mechanically: Secure the roof in a stable position (use manufacturer-specified supports or suitable props) to avoid collapse while hydraulic lines are disconnected.
- Drain/Catch Hydraulic Fluid: Prepare containers and clean rags. When disconnecting hoses, expect hydraulic fluid to drain—collect it and dispose of it according to local regulations.
- Disconnect Electrical Connector And Mounting Bolts: Unplug the electrical connector and remove pump mounting fasteners. Note hose positions to ensure correct reassembly.
- Fit New Unit And Reconnect Hoses: Replace damaged seals/clips. Tighten fittings to manufacturer torque where available and ensure leak-free connections.
- Refill And Bleed The System: Refill with the manufacturer-specified hydraulic fluid and bleed air from the circuit by performing controlled roof cycles and following a bleeding procedure until smooth operation is confirmed.
- Test Fully: Cycle the roof several times, check for leaks, listen for abnormal noises and verify proper roof alignment and sensor signals.
Why This Part Fails Most Often
- Hydraulic Leaks: Deteriorated seals, cracked hoses or loose fittings allow fluid loss and reduced pump performance.
- Contaminated Fluid: Dirt or degraded fluid accelerates wear of internal pump components and valves.
- Electrical Faults: Burnt brushes, motor wear or connector corrosion can cause the pump motor to fail or operate intermittently.
- Frequent Operation And Ageing: Repeated cycles and long service life lead to internal wear of the hydraulic motor and valves.
Practical Tips For Mechanics And DIY
Always use the manufacturer-specified hydraulic fluid and new seals or hose clamps when installing a replacement pump. Inspect hydraulic lines and the valve block for damage—replacing brittle hoses at the same time prevents repeated labour. If the roof is slow or noisy before replacement, check fuses, wiring and fluid level first; full system bleeding after fitment is essential to avoid air pockets that cause poor operation. For parts searches, include the code 8446S4 in listings to improve findability.
