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Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). It generates flow with enough power to overcome pressure induced by the load at the pump outlet.
OEM Part Number
- 54347193448
- 54347119633
- 54 34 7 193 448
- 54 34 7 119 633
Replacement for Following Models
2003 B-M-W Z4 2.5i 3.0i Convertible 2-Door
2004 B-M-W Z4 2.5i 3.0i Convertible 2- Door
2005 B-M-W Z4 2.5i 3.0i Convertible 2-Door
2006 B-M-W Z4 M Roadster Convertible 2-Door
2006 B-M-W Z4 Roadster 3.0i Convertible 2-Door
2006 B-M-W Z4 Roadster 3.0si Convertible 2-Door
2007 B-M-W Z4 MRoadster Convertible 2-Door
2007 B-M-W Z4 Roadster 3.0i Convertible 2-Door
2007 B-M-W Z4 Roadster 3.0si Convertible 2-Door
2008 B-M-W Z4 M Roadster /Roadster 3.0i Convertible 2-Door
Common Symptoms of Hydraulic Pump Failure
Unusual noise
An unusual or abnormal noise that can be heard from the hydraulic pump is an indication that a hydraulic pump is failing. This noise is usually caused by cavitations which are a result of low hydraulic fluid supply or aeration that can happen due to contaminated air moving into the hydraulic pump from the surrounding. This results in degradation of the hydraulic pump, leading to the unusual banging or knocking noise heard. The damage created by cavitations and aeration can be detrimental to the overall health of the hydraulic system.
High fluid temperature
Another crucial symptom of a weak hydraulic pump is high hydraulic fluid temperatures beyond 80°C. The hydraulic pump maintains fluid temperature within a normal range through the pump reservoir. However, the presence of debris or dirt can cause impaired function of the hydraulic pump reservoir which can lead to high temperature. The presence of air can also generate high hydraulic fluid temperature. If you notice an unusual high hydraulic fluid temperature, contact an engineer to get it checked.
Interior and exterior leaks
Hydraulic leaks could occur either inside or outside the hydraulic pump. Most times leaks occur inside the machine without exterior signs of malfunction. While internal leakage can occur within the hydraulic gear pump, actuators, or any attached valve, exterior leaks can be detected when liquids are noticed outside the hydraulic tubes. This could be as a result of a broken tube or loose seal.
Slow operation
One of the biggest symptoms of a failing hydraulic pump is a drop in performance. A hydraulic pump running slower than usual, showing longer cycle times, or a general decrease in the performance of a hydraulic pump is a cardinal sign that such a hydraulic pump is failing or becoming worse. In a hydraulic system, flow is what determines speed and response. Therefore, a loss of flow is directly associated with a loss of efficiency.
William w.
September 4, 2025
It does what’s its suppose to. It works and for a reasonable price.
J. C.
August 27, 2025
Purchased a pump for my convertible last month. Had a minor issue, but they stayed on top of the problem, and ensured that I was satisfied with the product once delivered.
Pam W
July 18, 2025
Ordered correct new part to replace Z-4 BMW convertible hydraulic pump. Paid German mechanic shop $810 to replace and it worked at shop two times then quit. I was told by Amazon I had to return part for refund; however, that would cost another $800 to take it out plus another repair bill to replace with a working part. I’m still upset and don’t know how to get this resolved fairly. I will never order a part myself. Shop would have order genuine part and warrantied. Lesson learned.
Joe
April 21, 2025
Works perfectly. So far. I did the pump and motor relocation while had the top off. 2007 bmw Z4.
Christer Ödahl
March 30, 2025
Fits perfectly
Jun C
March 25, 2025
My window to return is expired so I loss alot for notin don't buy this is garbage don't work the pump is luck an burn the electric motor so don't buy this is garbage
CENTRE MECATECH
December 28, 2024
ok
Michel R.
December 14, 2024
Pompe de toit pour BMW z4 2003 très bien
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