Be very careful when adding the extra pump on ! The guru's say that it takes approx. 1hp/1 gpm, so in theory adding a 10gpm pump to the system, you will take away another 10hp of engine performance away combined with the existing aux. pump which pending on the year of the 1845 can vary .....A close pal of mine has one '93 1845c and it only has a 56 hp na. cummins in it, the existing aux pump only produces 16gpm, if he was to add another 16gpm to it he now would require 32hp to drive this taking away from 56hp it only leaves 24hp for the rest of the machine to operate the main drive pumps ... he is looking into have the fuel pump worked on to up the hp ...it is possible .....have already contacted the fuel injection tech's. I just thought I'd add my $.02 ..... I had a NIGHTMARE machine that I had gotten rid of just because of trying to have a skid that would drive a hi-flow system. It was a '97 JD 8875 .... it had a dealer installed hiflow added to it ..... after 3 aux pumps melted and cooking the oil's so bad that it caused one of the main drive motors to crack and 18,000 phone calls to every JD dealer in North America .....going thru every problem bulletin that was ever printed by JD ... only to come up with.... TAKE IT OFF and run standard flow ..... by then all of the damage was done and now I was worn out trying to spend time trying to solve the headache .... a couple more years passed and the oil companies were getting rich off of me, the hyd leaks were excellerating faster than my wallet towards the end the machine was loosing 5gal/8hrs of plowing ..... I traded the 8875 off on an A-300 2yrs ago with all of the bells and whistles .....the Bobcat dealer had put 45 shop hrs x 2 techs (90hrs) on it to fix it. A year later we found out that there was an orrifice that should have been removed by the original Dealer install ...it was located in the main spool bank, when the extra pump was adding the extra flow that orrifice was choking the flow creating heat/friction to have the bionic 195 degree F. oil temps hence the cooking of oils and melting and hardening all of the seals in the unit (leaks)..... like I had said "BE CAREFULL" when installing these extra systems ....Just my $.02 worth what can happen...... GK