Automatic gearbox ZF 8HP55
Content
The ZF 8HP8 55-speed automatic transmission was produced by the concern from 2009 to 2018 and was installed on powerful Audi models under the 0BK index, sometimes it is referred to as 8HP55A and 8HP55AF. There is a version of this machine for hybrid cars with the index 0BW or 8HP55AH.
The first generation 8HP also includes: 8HP45, 8HP70 and 8HP90.
Specifications 8-automatic transmission ZF 8HP55
| Type | hydraulic machine |
| Number of gears | 8 |
| For drive | full |
| Engine capacity | up to 4.2 liters |
| Torque | up to 700 Nm |
| What kind of oil to pour | ZF Lifeguard Fluid 8 |
| Grease volume | 9.0 liters |
| Partial replacement | 5.5 liters |
| Service | every 60 km |
| Approximate resource | 300 000 km |
Dry weight of automatic transmission 8HP55 according to the catalog is 141 kg
Gear ratios automatic transmission 0BK
On the example of a 6 Audi A2012 Quattro with a 3.0 TDi engine:
| Home | 1-I | 2-I | 3-I | 4-I |
|---|---|---|---|---|
| 2.375 | 4.714 | 3.143 | 2.106 | 1.667 |
| 5-I | 6-I | 7-I | 8-I | Rear |
| 1.285 | 1.000 | 0.839 | 0.667 | 3.317 |
Which models are equipped with a 8HP55 box
| A4 B8 (8K) | 2011 – 2015 |
| A5 1(8T) | 2011 – 2016 |
| A6 C7 (4G) | 2011 – 2018 |
| A7 C7 (4G) | 2011 – 2018 |
| A8 D4 (4H) | 2009 – 2017 |
| Q5 1 (8R) | 2012 – 2017 |
Disadvantages, breakdowns and problems of automatic transmission 8HP55
This is a very reliable machine, but is often aggregated with particularly powerful engines.
When driving aggressively, the solenoids quickly become clogged with clutch wear products.
Vibrations from burnt clutches gradually break the oil pump bearings
Aluminum pistons and drums do not tolerate constant sharp acceleration from a standstill
Regular updates in all automatic transmission lines require bushings and rubber gaskets