How-To: Upgrade a Power Steering Pump to Run a Winch on a Land Rover Discovery

Mike Rupp upgraded the power steering pump in his Land Rover Discovery so that he could run a Milemarker 9,0000 pound winch.  He shares his experiences in an article with photos hosted on DiscoWeb.org.

Excerpt:

Parts list: (assuming that you already have the winch installed)

ZF74 pump, pulley, and relief valve set to 60 bar.(1100 psi) All available from 4x4winches.com

Hoses: high pressure line from pump to winch (you can use the old line from the winch install), high pressure line from winch to relief valve, and short hose from relief valve to steering box. You will need to measure the distances for each hose taking into account where the relief valve will be installed.

Hydraulic fittings:

high pressure side: T-fitting that fits into the relief valve and connects the high pressure hoses

low pressure side: T-fitting that fits into the relief valve and two 3/8" I.D. barbed adapters and hose clamps to connect the relief valve into the low pressure line from the steering box to reservoir

ATF

Introduction:

I ran the 9K Milemarker hydraulic winch for a year or so with decent results. However, there were quite a few times that the winch stalled using the standard LR pump. There are a few ways to get the hydraulic pressure needed to power the Milemarker, but I decided on replacing the stock pump with a higher rated ZF pump. The reasons that I chose this method rather than others was simplicity of installation, simplicity of operation and cost. Once installed, this system operates exactly like normal, except it has much more power.
 

See the full article here.