Trench - 74 420sx Operator’s Manual
Operation
CMW
1. If necessary, adjust throttle to low idle.
2. Move the trench/Roto Witch switch to the TRENCH position. DIGGING CHAIN WILL MOVE.
3. Increase engine speed to full throttle.
4. Slowly lower digging boom to depth.
5. Release parking brake.
6. Move ground drive control to desired speed.
7. If using optional trench cleaner:
• Stop tractor and turn ignition switch to STOP.
• Manually lower trench cleaner.
• Restart tractor, fasten seat belt, and continue trenching.
8. If soil conditions permit, set the attachment speed switch to the HIGH position.
9. Lower boom to trench depth and push ground drive control forward to desired trenching speed.
10. When trench is complete, move ground drive control to neutral.
11. Adjust throttle to low idle.
12. Raise boom.
13. As boom clears top of trench, move trench/Roto Witch switch to neutral.
14. Drive away from work site.
15. Shut down tractor. See page 52 for proper shutdown procedures.
16. Return optional trench cleaner to the stowed position.
NOTICE: Machine moves in reverse during trenching.
NOTICE:
• Do not have trench cleaner in working position when starting a trench.
• Do not drive forward with trench cleaner in working position.
• Do not use trench cleaner in conditions where large rocks can get between chain and
cleaner.
IMPORTANT: Always start trenching with attachment speed set at LOW. If soil conditions
permit optimum digging at higher speeds, select HIGH.
NOTICE: If an object becomes lodged in chain, raise boom slightly. Reverse chain direction. If
object must be removed manually, turn engine off and engage parking brake.
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