FAQs

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It is necessary to run an air cooled engine at its highest rpm for the following reasons:

A) The engine’s cooling and lubrication systems are designed to operate best when the throttle control is in the highest position. Running the engine at a lower speed will decrease the flow of cooling air and the volume of oil circulated. These two factors will shorten engine life.
B) The engine’s carburetor is adjusted so that the engine operates most cleanly and efficiently at full throttle. Operating outside or below the optimum speed range for the engine and carburetor produces less power.
C) Everything driven by the engine (eg. cutting deck) is designed to turn at the speed maintained by the engine’s governor when the throttle is at the highest position. Running the engine at a lower speed will result in lower performance and excess vibration as well as increased wear and tear on the various drive components (e.g. cutting deck drive belt).
D) Models equipped with engines that have DC electric starters and battery systems and have engines that recharge the battery may result in poor battery recharge rate if the engine is not operated at full RPM. These engines have stators that produce recharge electrical current to the battery circuit only when properly tuned and operated at full RPM. Most frequently the report of poor battery recharging can be traced to customers that do not keep the throttle at full. On tractors, and other self-propeled units, the engine should be kept at full throttle whenever possible and the ground speed should be regulated by shifting into a lower gear or using the ground speed control. Do not use the engine throttle to regulate ground speed or the battery will not get sufficient electrical current to maintain charge.

There are a few things that can cause clumping, clogging when bagging or a poor mulching situation. Most of these are operational issues, although some of them may have to do with the condition and type of cutting blade being used.Please review the information in the bulleted points below to help achieve improved cutting performance and disposition of the grass clippings.

CLEAN DECK? Make sure that the underside of your deck has been properly cleaned of any debris or clippings. A clean cutting deck will provide the greatest amount of air flow beneath and exiting from under the cutting deck. Sufficient air flow is important for both discharging the clippings properly and/or mulching the clippings

ENGINE AT FULL THROTTLE? It is necessary to run your unit at full throttle during your entire operation. Lack of engine RPM and reduced blade rotational speed can also result in reduced air flow underneath the cutting deck

GRASS TOO WET? Clumping can occur if you are mowing grass that is excessively wet. Try to mow only when your lawn is dry.  Note: Moisture makes up a significant percentage of grass composition. Recent rains, foggy or damp conditions may result in grass that may appear to be dry but actually is very moist. If the mower wheels become obviously damp or wet when the mower travels across the lawn the lawn is too wet to move the clippings properly.  Whenever possible, allow adequate drying time, before mowing under these conditions

CUTTING OFF TOO MUCH GRASS? Poor grass clipping movement can occur if you are mowing grass that is excessively long. Do not attempt to bag clippings or mulch when cutting off more than 2" of the overall grass blades with the mower. Overloading or "clogging" may occur if too much of the grass being mowed is being forced through the discharge opening in the cutting deck. If the lawn has been left to grow beyond normal cutting length, it may be necessary to make repeat mowings, starting at a higher cutting height and gradually lowering the cutting deck with each mowing pass until the grass is returned to normal heights

TRAVELLING TOO FAST? If operating at a faster ground speed, the mower will have trouble trying to discharge this increased volume of clippings through the grass collector chute properly. Make sure that you are traveling at a medium to slow pace (keep the engine throttled up but either walk slower or shift to a slower tractor speed) especially when bagging or mulching

BLADES DULL? An equipment issue that could cause this condition to occur is if the blades themselves have not been sharpened and balanced recently. Properly sharpened and balanced cutting blades will produce maximum air flow. Inspect, sharpen and balance blades as needed

DO YOU NEED OPTIONAL HIGH LIFT BLADES? "High-Lift" design cutting blades are designed to produce maximum ejection air flow out the deck discharge opening and may be necessary when the grass type and/or bagging conditions require additional exit airflow to eject the clippings completely. Generally speaking, larger cutting decks manage more clippings and this increase of clippings volume requires a greater amount of exit air flow to move the clippings out from underneath the cutting deck without clumping.

Usually this can be solved by performing a deck leveling adjustment. The deck leveling adjustment is listed in the adjustments section of the product operator’s manual.

Deck wheels*, and the tires on the tractor itself, could affect operation as well. Deck wheels are not intended to ride on the ground when traversing level ground. If the tractor is on a flat surface, the deck wheels should be approximately 6mm (1/4") off of the ground with the deck in your normal cutting position.

All tractor tyres should be checked for proper inflation pressure, the factory settings are generally 10 psi. for rear tyres, and 14 psi. for the front. NOTE: Although the tyres may be of the same pressure setting and style, some variances in tire composition and wear may produce tyres with differing heights when inflated to the same air pressure. Measuring the actual inflated tire height may be necessary to detect these subtle differences in inflated tyre heights.

If the problem still persists, it may be the result of one of two situations. The blades and/or spindles could be worn or out of balance. The tractor may also have bent or damaged deck hangers.

Finally the operator may be trying to cut grass that is too long for the machine to handle. In general a lawn is deemed to be grass approximately 10cm (4") to 15cm (6") long.

Under heavy conditions it may be necessary to go back over the cut area a second time to get a clean cut.
Do NOT attempt to mow heavy brush and weeds and extremely tall grass. Your tractor is designed to mow lawns, NOT clear brush.

*Deck wheels are narrow and are found bolted to some cutting decks to provide a smooth rolling traverse over uneven terrain. Larger decks (117cm/46" and up) may have wider deck rollers. Deck rollers are designed to be operated either hanging or in constant contact with the ground.