Mowers and Mowing Safety
The two principal types of mowers available for use on home lawns include "reel" and "rotary" mowers. Regardless which type is chosen, it is very important to keep the mower blades as sharp as possible. Dull mowers tear grass blades rather than cutting them. This results in injured plants.
Reel mowers (Fig. 8.12) have a series of revolving blades that cut against a stationary bedknife, much like a scissors (Fig. 8.13). While reel mowers provide the finest quality of cut available, they are expensive, not easily adjusted, and require specialized equipment for sharpening. Also, they can't be used where stones, twigs, or other debris are a problem because of potential damage to the cutting units. They are also not well adapted for use in higher heights of cut.
Figure 8.12. Reel mower.
Figure 8.13. Reel mower cutting mechanism.
Rotary mowers (Fig. 8.14) have a whirling horizontal blade. Rotating blades have the potential for throwing stones or other small objects in the path of the mower. Therefore, rotary mowers can be more dangerous to operate than reel mowers.
Figure 8.14. Side discharge rotary mower.
Rotary mowers cut the grass by impact, similar to the way a machete works. This causes a rougher, more uneven cut than reel mowers. However, rotary mowers do an acceptable job on virtually any lawn. In addition, they are easier to maintain then reel mowers and can cut taller grass.
Mulching or recycling mowers (Fig. 8.15) are now available. A mulching mower recuts grass clippings into smaller pieces and redistributes them uniformly back into the lawn for rapid decay (Fig. 8.16). When the turf is wet, clumping is common with mulching mowers because of the excess water present.
Figure 8.15. Mulching/recycling mower.
Figure 8.16. Notice the significantly smaller size of clippings as a result of using a mulching mower.
There is a growing movement among people with small, easily managed yards, back to "old-fashioned" push-type reel mowers. Newer versions are smaller, lighter-weight, and easier to push than the old clunkers you may have used as a youngster (Fig. 8.17). They have the advantage of quiet, fuel-free operation, and can provide good exercise at the same time.
Figure 8.17. “Old-fashioned” reel mower.
All mowing equipment should be kept in good working condition. Consult mower manual for annual routine maintenance practices.
As a general rule, mowers should be sharpened and adjusted frequently to assure a clean cut. A dull rotary mower frays the ends of grass blades and results in brown tips, which are unsightly and increase the plants' susceptibility to certain plant diseases.
Modern mowers are equipped with certain safety devices which should not be removed or tampered with. One safety feature is a blade that stops turning when the operator's hands are removed from the controls. Another is a rear-mounted rope pull for starting the mower. This reduces the chance of getting one's foot caught in the blades during starting.
Many rotary motors have bagging attachments which affect mower safety. The manufacturer may have a special attachment which is required for safe mowing without a bag. Similarly, discharge chute shields on non-bagging mowers should not be removed.
Slopes greater than about four to one are both difficult and dangerous to mow. These slopes are good candidates for alternative groundcovers or a no-mow grassed slope that will stabilize the bank and eliminate the need for routine maintenance such as mowing.
Table 8.2. Additional Mowing Safety Practices