2003 - 2008 BMW Z4 Convertible Top Hydraulic Pump (OEM)

Buying a replacement convertible top hydraulic pump can be tricky. Here's what to look for:

• Check the part number: Although we don't list numbers here, make sure the pump is the correct one for your specific year and model BMW Z3.
• Inspect the pump: Look for any signs of damage, such as cracks or leaks.
• Ask about testing: If buying a used or refurbished pump, ask if it has been tested to ensure it is working properly.

Quality indicators:

• OEM (Original Equipment Manufacturer): OEM pumps are made by the same manufacturer that made the original pump for your car.
• Warranty: A warranty indicates that the seller stands behind the quality of the pump.

What's included:

• Typically, the hydraulic pump itself is included.
• Sometimes the reservoir is included, but not always.
• Hoses and mounting hardware are usually sold separately.

Replacing the convertible top hydraulic pump can be moderately difficult.

• Difficulty level: Intermediate
• Estimated time: 2-4 hours

Special tools needed:

• Basic hand tools (wrenches, sockets, screwdrivers)
• Hydraulic fluid
• Possibly a scan tool to reset the convertible top system after installation

Critical steps and tips:

1. Disconnect the battery before starting any work.
2. Carefully disconnect the hydraulic lines from the old pump. Be prepared for some fluid to spill.
3. Install the new pump and reconnect the hydraulic lines. Make sure the connections are tight to prevent leaks.
4. Bleed the hydraulic system to remove any air.
5. Check the hydraulic fluid level and top off as needed.
6. Reconnect the battery.
7. Test the convertible top to make sure it is working properly.

DIY or professional installation?

• If you are comfortable working on cars and have some mechanical experience, you can probably do it yourself.
• If you are not comfortable working on cars, it is best to have a professional install the pump.

There are several options when buying a replacement convertible top hydraulic pump:

• Used OEM
• Refurbished OEM
• New Aftermarket

Used OEM:

• These are genuine factory parts that have been removed from used vehicles.
• They are typically the most affordable option.
• They are tested and inspected to ensure they are in good working condition.
• Offers the best value for a genuine factory part.

Refurbished OEM:

• These are factory parts that have been professionally restored.
• They may have new components installed.
• They are a good option if you want a reliable part at a lower price than new.

New Aftermarket:

• These are brand new parts made by third-party manufacturers.
• They are built to meet or exceed OE specifications.
• They can be a good option if you want a new part and are not concerned about it being an OEM part.

When replacing the convertible top hydraulic pump, it's a good idea to check these related parts:

• Hydraulic hoses: Old hoses can become brittle and leak.
• Hydraulic fluid: Contaminated fluid can damage the new pump.
• Convertible top cylinders: These cylinders are responsible for moving the top. If they are leaking or not working properly, they can put extra strain on the pump.
• Convertible top switch: A faulty switch can cause the pump to run continuously or not at all.

Replacing these parts at the same time can prevent repeat failures and save you time and money in the long run.

A convertible top hydraulic pump typically lasts 8-12 years.

Factors that affect longevity:

• Frequency of use: The more often you use the convertible top, the shorter the pump's lifespan.
• Maintenance: Regularly checking and topping off the hydraulic fluid can help extend the pump's lifespan.
• Climate: Extreme temperatures can shorten the pump's lifespan.

The price of a replacement convertible top hydraulic pump can vary depending on the option you choose:

• Used OEM: $150 - $300
• Refurbished OEM: $250 - $450
• New Aftermarket: $350 - $600

Labor cost considerations:

• Professional installation can add $200 - $400 to the total cost.

Total job cost estimates:

• DIY with Used OEM: $150 - $300
• Professional installation with New Aftermarket: $550 - $1000

The BMW Z3 convertible top system is known to have some common issues:

• Hydraulic fluid leaks are common, especially around the cylinders.
• The hydraulic pump can overheat if the top is operated repeatedly without allowing it to cool down.
• The convertible top switch can fail, causing the pump to run continuously or not at all.

There are no specific TSBs (Technical Service Bulletins) directly related to the hydraulic pump itself, but there are TSBs related to the convertible top system as a whole.

After installing the new convertible top hydraulic pump, it's important to verify that it is working properly:

• Check for leaks around the pump and hydraulic lines.
• Operate the convertible top several times to make sure it moves smoothly and without hesitation.
• Listen for any unusual noises from the pump.
• Make sure the convertible top locks securely in both the open and closed positions.
• Check the hydraulic fluid level and top off as needed.

If the convertible top is not working properly, recheck your work and consult a professional if necessary.

Q: How do I know if my convertible top hydraulic pump is bad?
A: Common signs include slow or erratic top movement, a whining noise from the pump, or the top not moving at all. Check the fluid level first.

Q: Can I replace the hydraulic pump myself?
A: If you have some mechanical experience and are comfortable working on cars, you can probably do it yourself. Otherwise, professional installation is recommended.

Q: What kind of hydraulic fluid does my BMW Z3 convertible top use?
A: Consult your owner's manual or a trusted mechanic to determine the correct type of hydraulic fluid for your vehicle.

Q: How often should I check the hydraulic fluid level?
A: It's a good idea to check the fluid level every 6 months or so, or whenever you notice any problems with the convertible top.

Q: Will a used pump last as long as a new one?
A: A used pump may not last as long as a new one, but it can still provide years of reliable service if it is in good condition and properly maintained.

OEM Part Numbers:

• BMW: 54340002816, 54347079586, 54348410305, 840722402

Fits Years: 2003 2004 2005 2006 2007 2008