Special Option: Core exchange for BMW E93 Hydro Unit (AKA Hydraulic Pump)
  • Special Option: Core exchange for BMW E93 Hydro Unit (AKA Hydraulic Pump)

Rebuild & Upgrade Service for BMW E93 Hydro Unit (AKA Hydraulic Pump)


Send us your pump and Top Hydraulics will rebuild and upgrade it outlast and outperform brand new ones. Model years '07+.

P/N 54377128779

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No sales tax for orders in the USA


We provide world class technical support


3-year standard warranty (should last decades)

Standard return shipping inside the US is $20.00 by USPS Priority Mail (2-3 day delivery).

FedEx Priority Overnight return shipping within the continental US is $90.

FedEx International Priority return shipping is $95.

Please be sure to drain all fluid from your original pump and wrap it in absorbent material, to make sure that your parcel does not get soaked in oil, and that the electric pump motor does not get soaked in oil. An oil soaked motor is a total loss for us.

If you send us your pump with the mounting brackets for the hoses, then we will ship the pump back to you filled with fluid. Having your original hose brackets allows us to securely plug each hydraulic line port with a silicone plug, and thus safely return ship a pump filled with fluid.

Removal of the pump from the car is simple: the pump unbolts from the mounting frame, the wiring harness unplugs easily, and the hoses are removed by taking off the retaining plates that hold them in place. Re-attaching the hoses is easy: simply match up the two-digit number that is printed on the hose about 3/4" from the steel fitting to the number embossed on the retaining plate.

Seals inside the pump get upgraded, and design flaws get rectified. Pumps rebuilt by Top Hydraulics perform better than brand new ones, and Top Hydraulics' seals will far outlast those in brand new pumps. The pump we are shipping to you may not be perfect cosmetically, because it has been used before. We do our best to clean up or polish out external blemishes, but what really matters is what's inside the pump. We are certain that we are shipping a pump to you that is better inside than a brand new one, and we back that by a 3-year warranty.

The most common failure symptom on used BMW E93 hydro units is a gradual loss of pressure and power. There are various possible reasons for gradual power loss inside the pump/hydro units, ranging from degrading electric motors through pump pistons wearing out and check valves bypassing, to pressure regulators failing, or even hydraulic fluid seeping into the electric motor. Top Hydraulics will check that all these components meet or exceed factory specs and exchange or upgrade them if necessary. Bench testing includes all valve functions, pressure test, flow test, extended load test, and test for leaks, to make sure that factory specs are exceeded before the pump ships back. Beware when purchasing used pumps that those may actually be units that are still pumping, but are not able to complete the convertible top's opening or closing cycle without manual assistance.

Some of these pumps have external leaks (you may find the foam casing soaked in hydraulic fluid). The most common source for external leaks on these pumps are the port seals. Port seals are tiny seals of special shape that are sealing the hydraulic lines when they are plugged into the pump. The port seals are behind brass bushings. These bushings are pressed into the pump housing, and they are made to 1/100 mm precision. Any DIY repair attempt would destroy the bushings. Top Hydraulics replaces the original port seals with an improved version made of Viton, which has practically unlimited shelf life. Before assuming that the pump is leaking externally, check the hydraulic lines going into the pump to make sure they are dry.

If your top is moving slowly or erratically, make sure that all sensors in the system are working, and that there is good power supply and ground to the pump. If sensors in the top's system give the wrong signal, then the computer will stop your top's function as soon as it is deemed unsafe based on the readout from the sensors.


Specific References

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Special option: Core exchange. This means that you get a rebuilt & upgraded pump from Top Hydraulics' inventory first, then you ship back your original pump for credit of your $250 core refund. You get a pump that has been rebuilt to outlast and outperform brand new ones. Model years '07+.

P/N 54377128779

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