ENGINE,   FUEK,   EXHAUST   AND TM   10-3930-643-20 4-13. Tachometer   Drive   (S/N   2001 INSTALLATION 8. Using   a   1-5/16”   combination TROUBLESHOOTING  AND  MAINTENANCE.  (cont) and   above).   (Sheet   3   of   3) wrench, install   locknut   (3)   on   tachometer drive   assembly   (2)   all   the   way   up   on threads. 9. Using   a   1-1/4”   open   end   wrench, install    tachometer    drive assembly (2)   on   injection   pump   access   cover. Tachometer   must   be   positioned,   as shown,   before   tightening   locknut. 10. Using   a   1-5/16” combination   wrench, tighten   locknut   (3). 11. Install   right   side   access   cover   (1) on   right   side   of   engine   compartments refer   to   paragraph   12-4. NOTE Return   M1OA   Forklift   to   original equipment   condition. END OF TASK 4-50