Porsche Boxster Part 996.572.563.04: The Convertible Top Hydraulic Pump Explained

The Porsche Boxster is renowned for its precision engineering and open-top driving experience. When the convertible top starts acting up, the culprit is often the hydraulic pump, specifically part number 996.572.563.04. This component is the heart of the Boxster’s power top system, and understanding it can save you time, frustration, and money. Whether you’re troubleshooting a slow or stuck top, or proactively maintaining your car, knowing what this part does and how to replace it correctly is essential.

What Is Part 996.572.563.04?

Part 996.572.563.04 is the genuine Porsche convertible top hydraulic pump, used primarily in the Boxster 986 (1997–2004) and also compatible with certain 996-generation 911 models that have a power top. The pump is responsible for generating hydraulic pressure that moves the top’s cylinders, raising and lowering the convertible roof. It sits behind the seats, under a panel, and is a sealed unit containing an electric motor and hydraulic fluid reservoir.

Over time, these pumps can fail due to electrical issues (like a failing motor) or hydraulic leaks. The “04” suffix indicates a revised version of the original pump, addressing earlier reliability concerns. Many early Boxsters had pump failures, and this updated part offers improved durability.

How the Hydraulic Pump Works

The system is straightforward: when you press the top switch, the pump activates, pressurizing hydraulic fluid that flows to two cylinders—one on each side of the top. The cylinders push the top up or pull it down. If the pump loses pressure, the top may move slowly, not at all, or only in one direction. Sometimes you’ll hear a humming sound but no movement, which points directly to a pump issue.

Signs Your Hydraulic Pump Needs Replacement

If you own a Boxster with the power top, watch for these common symptoms:

• Top moves very slowly or stops mid-cycle. This is often the first sign of weakening pump pressure.
• Top only works intermittently. Electrical contactors inside the pump can fail, causing sporadic operation.
• Hydraulic fluid leaks. Check under the pump area for fluid puddles. The pump’s seals can degrade.
• Unusual noises. Grinding or whining sounds from behind the seats indicate motor bearing failure.
• Top won’t latch/unlatch when operating. If the pump can’t generate enough force, the latches may not engage.

Ignoring these signs can lead to a completely stuck top, which is expensive to repair manually. Replacing the pump at the first symptoms is cost-effective.

Compatibility and Fitment

Part 996.572.563.04 is the OEM replacement for:

• Porsche Boxster 986 (1997–2004)
• Porsche Boxster S (2000–2004)
• Porsche 911 Carrera Cabriolet (996 generation, 1999–2004) – but confirm your specific model year.

It also fits the Boxster’s power top system used in the 2005–2005 model year transition, but later Boxsters (987) use a different pump. Always verify your VIN or existing part number before purchasing.

Cross-Reference Numbers

The pump may be listed under other OEM numbers such as 996.572.563.00, 996.572.563.01, 996.572.563.02, or 996.572.563.03. The ‘04’ version supersedes all earlier ones, so it is the recommended replacement.

OEM vs Aftermarket Options

When replacing the hydraulic pump, you have three main choices:

Genuine Porsche (OEM)

• Pros: Guaranteed exact fit, uses quality components, direct replacement, often includes a new reservoir with fluid.
• Cons: High price (typically $600–$900). However, the OEM pump is built to last and comes with a warranty. For many owners, the peace of mind is worth the premium.

OEM Rebuilt/Remanufactured

• Some companies rebuild pumps with new seals and motors. These can cost $300–$500 and offer good reliability if done properly. Look for suppliers that specify “new motor” and “OEM-spec seals.”
• Pros: Lower cost than new OEM, often includes core return.
• Cons: Quality varies; you need a reputable rebuilder.

Aftermarket New

• A few manufacturers produce new pumps that are compatible but not Porsche-branded. Prices range from $200–$400.
• Pros: Budget-friendly.
• Cons: Potential fitment issues, shorter lifespan, no Porsche quality control. Some aftermarket pumps fail quickly due to inferior motors or seals.

Our recommendation: If you plan to keep your Boxster for years, go with OEM. For a short-term fix or tight budget, a well-reviewed remanufactured unit can work. Avoid cheap aftermarket pumps unless you can verify their build quality.

How to Choose the Right Pump

1. Verify fitment – Check your VIN using a Porsche parts lookup or remove your existing pump and read the part number. Ensure the new pump matches.
2. Check fluid level – Sometimes a low fluid level or a simple electrical fault mimics pump failure. Before buying a new pump, check the reservoir level and inspect the pump’s electrical connector.
3. Compare prices – OEM is available from Porsche dealerships or online Porsche parts specialists. Remanufactured pumps are sold by specialty shops. Read supplier reviews.
4. Look for complete kits – Some sellers offer the pump with new mounting bushings and fluid. This saves time.

Installation Considerations

Replacing the pump is a moderate DIY job if you have basic mechanical skills. The pump sits behind the seats, under a plastic cover. Steps include:

• Disconnecting the battery (safety for airbags).
• Removing the trim panel and old pump.
• Transferring the hydraulic lines (pay attention to orientation).
• Refilling with correct hydraulic fluid (Porsche part number 000.043.203.00 or equivalent).
• Bleeding the system by cycling the top.

If you’re not comfortable, have a Porsche independent shop do it. Labor is usually 1.5–2 hours. Improper bleeding can cause pump damage.

Frequently Asked Questions

Can I repair my pump instead of replacing it?

Sometimes, if the pump has a failed electrical contact or seal, a rebuild is possible. But the motor bearings and internal seals degrade over time. Rebuilding requires special tools and knowledge. For most owners, replacement is more reliable.

How long does a replacement pump last?

A new OEM pump typically lasts 8–12 years with normal use. Harsh climate (extreme heat or cold) can shorten lifespan.

Is there a special fluid for the Boxster pump?

Yes, use only Porsche-approved hydraulic fluid or a Pentosin CHF 11S equivalent. Do not use brake fluid or ATF.

Final Recommendation

Part 996.572.563.04 is a critical component for Boxster convertible top operation. If you experience symptoms, diagnose the pump first by checking electrical supply and fluid level. When replacement is necessary, we recommend the genuine Porsche part for longevity and trouble-free operation. It costs more upfront but avoids the headache of early failure. If budget is a concern, choose a remanufactured unit from a trusted supplier who uses quality components. Avoid generic aftermarket pumps that may lack reliability. Always use the correct fluid and follow bleeding procedures. Your Boxster’s top will thank you.