TM 9-2815-225-34&P 3-63.  FUEL PUMP TESTING AND CALIBRATION (Contd) LOCATION/ITEM ACTION REMARKS g.  Governor Cutoff RPM Check (Contd) 57. Slow button (23) and stop a.  Depress slow button (23) to slow button (24) test stand to minimum speed. b.  Depress stop button (24) to stop test stand. 58. Governor spring pack Remove from fuel pump main housing (43) and snapring housing (51). (95) 59. Shims (96) Remove to decrease governor Each 0.001 in.  (0.025 am) cutoff speed and add to increase thickness of shim will change the governor cutoff speed. governor cutoff speed about 2 rpm. Shims are available in 0.005, 0.010, and 0.020 in.  (0.127, 0.254, and 0.508 mm) thickness.  They should be placed between gover- nor spring (97) and retainer (98). If more than 0.150 in.  (3.81 mm) total shim thickness is required, replace governor spring (97). 60. Snapring (95) and governor Install on fuel pump main After installing shims, snapring, spring pack housing (43) housing (51). and spring pack housing, purge the fuel pump of air as described in step 47.  When fluid in flowme- ter glass tube is clear again, recheck governor cutoff point as described in steps 54 through 56. 3-490