Gustaf,

Whare are you located? The dealer can probably answer your question on the phone for no charge. I see you are in Indiana, so I may be working for your servicing dealer. The short answer is if the hydrualics pump runs off a contactor, some sort of orfice or valve may need to be installed to reduce the flow. If it is SCR controlled hydraulics, yes the flow rate can be adjusted. A quick and dirty way is to plumb the clamp with 1/4 inch hose. That will reduce the flow a lot. Whatever the 1/4" hose won't pass will be dumped back to the tank through the releif valve.

Hope this helps.