TM 10-3930-659-20 5-25. ENGINE IDLE SPEED AND SPEED CONTROL LINKAGE ADJUSTMENTS (Con't). NOTE Perform steps 10 through 12 only If fast idle speed is not within specification. 10. Remove seal (8) from high idle stopscrew (6).  Discard seal. 11. Loosen  locknut  (9)  and  turn  high  idle  stopscrew  (6)  counterclockwise  to  increase  rpm  or  clockwise  to decrease rpm.  Tighten locknut. 12. Install new seal (8) on high idle stopscrew (6). 13. Install accelerator cable (7) on fuel injection pump lever (4) with nut (5). TA706897 5-73