ZF74 pump

[prelude]

I have been looking into mounting a hydraulic winch for some time and I came across a few posts on the internet that suggested a ZF74 pump. This unit could be mounted in place of the existing power steering pump. A presure regulator would then be used to keep the steering rack in one piece :) and the increased volume and pressure would be put to good use on the winch.

The site that used to sell these kits, 4x4winches.com has long since gone out of business and there is very little information on these units to be found. I did find a thread here on the forum http://www.aulro.com/afvb/technical-chatter/106352-hydraulic-winches-any-good-4.html which only refers to it as a midget :) but no further information.

ZF products have a 10 digit product number and without it I can't really get anywhere. I did have contact with ZF lencksysteme GMBH but it seems bosch has taken over this business. Even then, with only the number 74 the (very helpful) guy I spoke with can't help me any further.

I'll try my luck with Bosch but I do not hold much hope, so, does anyone here have one or have the actual 10 digit product number of the pump?

I would like to keep things as standard as possible since on my GEMS V8 the pumps and alternator sit way up high, out harms way of water and mud and mounting an extra pump would not be my preference so a replacement pump would be perfect.

Thanks!

-P

[rangieman]

This pump;)
Difflock :: View topic - ZF74 - photos (http://forum.difflock.com/viewtopic.php't=25478&sid=73963545aba8f6245c559db95b79a033)

[prelude]

Well... I guess the OP probably knows this to be a ZF74 pump. According to some googling this is a power steering pump used on a Renault Laguna 2.2 dci. Pompa Servodirectie Renault Laguna 2.2 dci Cod piesa: 7846075 - #1748888193 (http://www.pieseauto.ro/pompa-servodirectie/renault/laguna/pompa-servodirectie-renault-laguna-2-2-dci-cod-1748888193.html)

I did find a picture of the ZF74 pump from 4x4winches.com (attached) which I got from the internet archive and they do not look the same. It could very well be though that it came in different models. Would like to be sure though :)

Thanks!

[Rick1970]

Good luck with Bosch/Rexroth if they have taken it over. Bosch makes a lot of OEM only hydraulic gear, and usually very little info/support is available for the OEM specific gear.


Buck (Andrew) at Bosch/Rexroth Sydney is good for Bosch hydraulic info, but seems to get fairly bogged down with the workload.......


In any case, the specs they mite give will be the maximum controlled output flow. You could get this number higher, as you prob could with your original pump, with mods to the pumps inbuild flow control valving. Ditto the relief. This may then require an external flow control/relief to keep within the steering box's design parameters. BUT, you could end up with an external source with a higher flow/pressure that is switchable for the winch.


There are also available electric clutched / belt drive pump adaptors that you could bolt any number of different DIN mount hydraulic pumps too. Just a thought.....