Welcome to IRV2.
Lot's of information on this forum about hydraulic pump failures.
Three failures is a lot, although there has been a known problem with the Lippert brand hydraulic pumps on the Monaco product line dating back to 07, most of the units that have surfaced date from 07, 08, 09 and Lippert was supposed to have fixed the problem, caused by faulty motor shaft seals, in 09/10.
Check this thread and see if it matches you experience....
LCI Hydraulic Pump - Good Experience