

Expedited Core Exchange Option where Top Hydraulics ships parts from our inventory first is $700 plus a $300 Refundable Core Charge.
These pumps have been rebuilt and upgraded. The electric motor has been replaced or rewound if necessary. A new high-current relay has been installed, and all hydraulic valves serviced. The internal seals in the pumps have been upgraded to eliminate current or future pressure loss or internal leak. Three years warranty.
P/N 54-34-7-421-753, aka 7310756, aka 541090, aka 54347421753
No sales tax for orders in the USA
We provide world class technical support
3-year standard warranty (should last decades)
This is a special core exchange option only:
Ships filled with fluid for simple plug-and-play installation.
P/N 54-34-7-421-753, aka 7310756, aka 541090, aka 54347421753Core deposit may be withheld if the reservoir on your core arrives broken or the aluminum ring around the motor has been crushed beyond repair. Please wrap the pump in absorbent material and put plastic bags around it, buffer your parcel well inside, ideally double-box, and tape up well.
Ships within the US via FedEx 2-Day Service for $20, or internationally for $90 to most countries.
(International shipments are packaged tightly but safe, so that we can use a FedEx Flat Rate package. The pump ships without the black plastic motor cover in international shipments - re-use your original one)
Rebuild/Upgrade service for your 2002-2009 BMW 7-Series Hydraulic Trunk Lid Cylinder.
Send us your part first and we will rebuild and upgrade it to better-than-new condition.
3-year warranty!
Cylinder only - pump would be separate.
You send us your pump to be rebuilt and upgraded. Includes replacement of electric motor if needed, overhaul of valves and internal parts of the pump assembly to exceed manufacturer's specs, a full bench test for flow, pressure, and thermal behavior. Ships filled with fluid for plug and play installation.
Expedited core exchange option is available and includes a $30 inventory surcharge + $150 core deposit.
BMW p/n 54348410305
840722402
HB70095-002
Convertible hydraulic cylinder rebuild/upgrade for BMW model Z4 convertible soft top lifting system. Z4s have two "Convertible Hydraulic Top Hinges" with one built-in cylinder each. The price listed is per pair.
Optional core exchange is $100 more, plus a $400 refundable deposit, see details below. Core exchange is available only to US customers. The core exchange option is temporarily sold out.
Package deal! Includes Rebuild/Upgrade of all 6 hydraulic cylinders and the hydraulic pump unit.
You send in your parts first and we will upgrade them to better than new condition, or choose the core exchange option and we ship from our inventory first.
Rebuild/Upgrade Service for Left Tension Rod Cylinder for BMW F23 2-Series.
Send in your part(s) first, or select "Order now with core exchange" to order from our inventory. Core exchange orders are subject to a $50 inventory surcharge as well as a $120 refundable core deposit.
Replaced and improved rod seals, piston seals, cap seals, gland seals, wipers, and port seals make these parts better than brand new ones, with an expected service life of 30-50 years under normal circumstances.
P/N: 54347421759
Rebuild/Upgrade Service for Left Main Lift Cylinder for BMW E88 1-Series.
Send in your part(s) first, or select "Order now with core exchange" to order from our inventory. Core exchange orders are subject to a $50 inventory surcharge as well as a $120 refundable core deposit.
Replaced and improved rod seals, piston seals, cap seals, gland seals, wipers, and port seals make these parts better than brand new ones, with an expected service life of 30-50 years under normal circumstances.
P/N: 54347190665
Early model years (cut-off somewhere in 2003) have bow tension cylinders aka clamping bar cylinders with hydraulic lines that cannot be removed from the cylinder. Send in your left side cylinder, and Top Hydraulics will replace the line with OEM material.
This is a special Core exchange option only.
We ship you a pair of E46 Bow Tension Cylinders from our inventory, and you send us back your old parts for a refund of your $300 deposit.
NOTE: If you have a 2003 model, we will need to know if your left bow tension cylinder has a detachable (clip-on) aluminum line fitting before you place your order
Rebuild/Upgrade Service for the full set of BMW F23 2-Series.
Send in your cylinders first, or select "Order now with core exchange" to order a set from our inventory. Core exchange orders are subject to a $200 inventory surcharge as well as a $600 refundable core deposit.
Replaced and improved rod seals, piston seals, cap seals, gland seals, wipers, and port seals make these parts better than brand new ones, with an expected service life of 30-50 years under normal circumstances.
You send in your malfunctioning BMW F12 6-Series hydraulic pump unit, and Top Hydraulics rebuilds it. The rebuild includes electric motor replacement or rewinding if necessary, service of hydraulic and solenoid valves, service of moving parts and replacement as necessary, upgrade of internal seals in the pump to eliminate current or future pressure loss or internal bypass, and extensive testing to ensure the pump exceeds factory specs. Three years warranty.
Core exchange option is available (we ship the part first from our inventory) for $50 surcharge plus $250 deposit. Core exchange pumps ship filled with fluid, for plug-and-play installation.
p/n: 54347299838
Slightly extended version of the OEM hose, which is not available from BMW. Only available from Top Hydraulics. This line is for the newer version bow tension cylinder on the left side, top fitting, where the lines are attached via a screwed on clamp.
Price listed is for rebuild/upgrade service for an individual hydraulic hinge cylinder.
Expedited Core Exchange Option includes a $250 Refundable Core Charge plus a $75 surcharge for inventory management.
It is highly recommended to upgrade them in pairs. These hydraulic cylinders always fail almost simultaneously.
To order a pair of hinges instead, click here.
Rebuild/Upgrade Service for Left Main Lift Cylinder for BMW F23 2-Series.
Send in your part(s) first, or select "Order now with core exchange" to order from our inventory. Core exchange orders are subject to a $50 inventory surcharge as well as a $120 refundable core deposit.
Replaced and improved rod seals, piston seals, cap seals, gland seals, wipers, and port seals make these parts better than brand new ones, with an expected service life of 30-50 years under normal circumstances.
P/N: 54347421755
Extended version of the OEM hose, which greatly reduces labor needed to replace and eliminates the same manufacturing/design error seen with this hose originally in your 3-Series Convertible. Only available from Top Hydraulics.
It is highly recommended to upgrade the bow tension cylinders in pairs. You send in your cylinder(s) first.
BMW part number 54348243269