pump chamber inner gear 92 fits within an outer gear 90 and generally has one tooth less than outer gear 90 so that outer gear 90 rotates at a lesser speed than inner gear 92 outer gear 90 is mounted eccentrically relative to shaft 72 and gear 92 line 28 from lubricant reservoir or sump 26 is connected to suction or inlet passage 94 in communication with arcuate inlet chamber 96 through port 95 lubricant is distributed by gears 90 and 92 to arcuate outlet chamber 98 in communication with pressure or outlet passage 100 through port 97 outlet passage 100 is connected to outlet 30 for supplying pressurized lubricant through lines 30 and 32 to bearings 14 as shown in fig1 lubricant is preferably supplied to bearings 14 at a pressure of around 7 to 10 psi to maintain the lubricant below a predetermined maximum pressure a lubricant relief passage 102 is provided between inlet passage 94 and outlet passage 100 a ball valve member 104 is urged by a compression spring 106 into a seated position normally blocking the flow of lubricant through passage 102 the compression of spring 106 may be predetermined by threaded stem 108 secured by lock nut 110 ball valve member 104 may be set to unseat at 8 psi for example to provide communication between inlet and outlet passages 94 100 for the relief of lubricant pressure in outlet passage 100 at a pressure above 8 psi ball valve member 104 reseats upon a decrease in the lubricant pressure to the predetermined level thereby to maintain the pressurized lubricant below the predetermined pressure such as 8 psi lubricant is also supplied through branch passage 112 from inlet passage 94 to bearing 114 for shaft 72 as shown in fig6 lubricant pump 24.