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HOLT HGW30 Stump Grinder
Operator’s Manual
7.3.1 Operator Controls
A
B
C
D E
F G
A. Rotor Engage/Disengage
B. Traction Control
C. Swing & Drive Speed Control
D. Rotor Swing Control
E. Rotor Lift Control
F. Steering Control
G. Drive Control
7.3.2 Grinding A Stump
^
WARNING
Prevent serious injury or death.
Keep clear of moving machinery.
1. Start stump grinder engine. See OEM engine manual for
safety, prestart and operational information.
2. Set engine speed at high idle.
3. Adjust stump grinder swing speed. Rotate swing & drive
speed control (C) counter clockwise to slow setting. It
is recommended to start at the slow setting and adjust
speed up as desired.
4. Rotate traction control (B) fully clockwise to lock drive
wheels together. Rotate control counter clockwise to allow
steering.
5. If the stump is on a grade, position stump grinder lower
on the grade with the cutting wheel on the stump grinder
higher up the grade.
6. Position stump grinder up to the front edge of the stump
using levers (F) and (G).
7. Check position of the stump grinder to the stump. Verify
stump grinder is positioned at the edge of the stump that
is closest to the stump grinder.
8. Verify rotor is close to, but not touching stump. Adjust
rotor height with lift control lever (E).
9. Engage rotor with lever (A).
10. Use lift lever (E) and swing lever (D) to direct the rotor.
Make the first pass across front edge of stump, moving
the cutting wheel from side to side in 3-6 inch passes.
11. Continue to take passes across the front edge of the
stump, taking 3-6 inches on each pass.
12. When ground level is reached, continue to grind up to 12
in. (305 mm) below the surface to the bottom of the stump
where the roots branch out.
13. Lift rotor and swing it to right or left side. Back the stump
grinder up slightly to position the stump grinder beside the
new front edge of the stump.
14. Make multiple passes over the front edge of the stump,
taking 3-6 inches on each pass.
15. Reposition stump grinder as needed until the entire stump
has been removed to below ground level.
16. Follow the roots, taking as much of the larger surface
roots as possible. If these are not removed they can, over
time, protrude from the ground in areas where there is a
heavy freeze/thaw cycle.
17. Move stump grinder away from stump to a flat surface.
18. Set engine speed at low idle.
19. Stop stump grinder engine.
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