INSTRUCTIONS FOR USE OF THE NYLON CUTTING HEAD (Model WBC253)
(BUMP & FEED BF4)
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Safety Instructions
1Read this section carefully and thoroughly before use
2Check the nylon cutting head carefully before each use If you notice any of following, replace the worn or damaged parts with new ones immediately (Fig 40)
Dents appear on the knob head
The housing (cover) is damaged or cracked | 1. |
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The "Limit marks (notches)"on the cover have | '=== | __ - | |
disappeared |
| Fig | 40 |
3 Wear appropriate clothing and protectors | r- |
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4Always stop the engine before inspecting the cutting head or replacing the nylon cord
5Do not allow anyone near the operation area The cutters might send stones or debris flying, possibly harming bystanders
6Never use the cutting head BF4 on tools with a cutter head speed higher than 10,000 RPM
installation
See page 5 (Mounting the nylon cutting head)
0peration
1Increase t h e cutter head speed to approx 6 000 RPM Low speed (under 4,000 RPM) causes inefficient cutting Use the tip of the nylon cord (shaded area shown in Fig 41) for more effective cutting.
2When t h e nylon cord wears down (becomes short), decrease the engine speed to under 4,000 RPM and tap the knob of the nylon cutting head against the ground to advance the nylon cord (Fig 42)
rI Fio. 43
Parts Breakdown | I | ., |
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| Fig 41 |
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Fig. 42
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