TM10-3930-660-34 16-21.PISTON PUMP - REPAIR (Cont’d) f.  Install bearing spacer (33) at one pintle end. g. Install new O-ring (32) against spacer and into groove at one pintle end. h. Install a 0.010 inch shim under pintle cover (29) at one pintle end. i.  Install four pintle cover screws (28) into pintle cover installed in step h above,  and tighten screws to 175-185 lb. in. j.  Place housing (6) on its side so other end of pintle is facing up. Install bearing spacer (33). k. Turn yoke (26) back and forth to seat bearings (31) in bearing races (30). 5.   INSTALL CORRECT PINTLE SHIMS (27). a.  With spacer (33) fully installed against bearing race (30),  measure height of spacer with respect to the housing pintle face using a micrometer. Take measurements in two places,  180 degrees apart. b.  Average the two readings taken in step a above to obtain a nominal value. NOTE A 0.007 - 0.009 inch preload is required on the pintle bearings. c.  Determine the number of shims required to obtain a preload between 0.007 and 0.009 inches by subtracting the nominal preload (0.008) from the calculated nominal valve (step b). 16-136