12. OPERATION Prohibited operations using dropping force of machine. Do not use the dropping force of the machine for digging. Digging rocky ground It is better to excavate hard rocky ground after breaking it up by some other means. This will not only reduce damage to the machine but make for better economy. Sudden lever shifting during HI-speed travel prohibited a Never carry out sudden lever shifting as this may cause sudden starting. b Avoid sudden lever shifting from forward to reverse (or vice versa) c Avoid sudden lever shifting change such as sudden stopping from near top speed (lever release operation). PC450-ENG 2-68