2015 CAT 279D Hydraulic pump is cavitating. Machine drives but the loader arm fuctions are not working. , BATTERY,XTRA HVY DUTY 1000 CCA, CONVERSION ARRANGEMENT, DISPLAY, ADVANCED, LCD, CAMERA, DOOR, CAB, GLASS, ENGINE S/N 8EW1339, HEATER, ENGINE COOLANT, 120V, HYDRAULICS, PROPORTIONAL, WT, INSTRUCTIONS, ANSI, USA, INSTRUCTIONS, ENGLISH, LANE 2 ORDER, Online Owner's Manual , PACK, DOMESTIC TRUCK, PACKAGE, PERFORMANCE (H2), PDI DONE BY KEEN, PRODUCT LINK, CELLULAR PL641, QUICK COUPLER, ELECTRIC, RADIO, AM/FM, BLUETOOTH, RIDE CONTROL, NONE, ROPS, ENCLOSED WITH A/C (C3), RUBBER BELT, 2 SPD, TF IDLERS, SEAT BELT, 2", SEAT,AIR SUSPENSION,VINYL,HEAT, TRACK,RUBBER,450MM(17.7IN)BLCK,