Which ZF and TRW parts we buy
| Product group | Marking | Note |
|---|---|---|
| Steering gears hydraulic | ZF part number 7852 xxx xxx, TRW JRP… | Rack straight, housing intact |
| EPS steering gears | ZF/TRW with control unit | Only complete with electronics |
| Steering boxes trucks | ZF Servocom 8095 …, 8098 … | With pitman arm |
| Power steering pumps | ZF 7691 …, 7692 … | Ports sealed |
| Brake calipers | TRW with casting number | Piston may be seized |
Reading the ZF part number
ZF part numbers have ten digits in three blocks, for example 7852 955 108. The first block identifies the product family (7852 rack-and-pinion steering, 8095 and 8098 steering boxes of the Servocom series, 7691 and 7692 pumps), the following blocks the variant. The type plate usually also carries the vehicle manufacturer's OE number. TRW steering gears carry numbers with a letter prefix (e.g. JRP) and the OE number.
Bosch Automotive Steering
The former ZF Lenksysteme GmbH (joint venture of ZF and Bosch) has belonged fully to Bosch since 2015 and is called Bosch Automotive Steering. We treat steering gears with ZF Lenksysteme marking from that period like ZF parts. See also Bosch.
Type plate on the ZF/TRW part
- Steering gears: label or stamping on the housing near the valve housing, for EPS on the control unit
- Steering boxes: type plate on the housing, stamping on the cover
- Brake calipers: casting number on the housing, TRW logo
Typical rejections
- Rack bent after an accident
- Housing with cracks or weld repairs
- EPS without control unit
- Steering boxes with damaged input shaft splines
Frequently asked questions
Do you buy ZF steering boxes from buses?
Yes, steering boxes from coaches and city buses are in demand because of their high mileages.
What about TRW steering gears with oil leaks?
An oil leak is a normal reman case. What matters is an intact housing and a straight rack.