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Twin rtry Operation Section 3-5
OPERATION
Once on location, lower the mower deck slightly above the material to be cut, so
the mower does not have to start under a load. Bring the R.P.M. of the tractor up to
1200 and engage the side mower. If a rear mower is being used, allow the R.P.M. to
return to 1200 before engaging the rear mower.
The rotary mower deck should always be carried rather than dragged on the skid
shoes when mowing on the ground. Dragging the rotary mower heads causes an
extreme side load on the tractor resulting in premature tire wear. It also causes
excessive horsepower consumption and drastically decreases blade life. Dragging
the rear mower can also cause damage to the road. Once the necessary skill is
attained at controlling the height and position of the side rotary mower, it will be easy
to carry the mower head(s) and do a proficient job of cutting.
When cutting tall shrubs or small trees (maximum recommended size of material
to be cut is 2” diameter) begin each pass at the top of the material and work down
with each consecutive pass. Use a low speed to allow the cutting blades time to
mulch as well as cut the foliage. When the initial pass has been made, disengage
the mower and return the mower to the travel position. Return to the starting point
and make next pass, etc.
When using the rotary cutting head for trimming trees and shrubs, let the
mower saw into them. Do not lower the mower head down directly onto a
tree or stump. The mower blades are designed to cut with the end, and
misuse can cause damage to the blade and a hazardous situation for the
operator.
To ensure a clean cut, engine speed should be maintained at approximately 1800
– 2200 R.P.M. If the tractor slows to less than 1800 R.P.M., shift to the next lower
gear. DO NOT ride the clutch, this will cause premature clutch failure. The engine
should not be operated at any time at more than 2400 R.P.M. on the tractor
tachometer.
DO NOT use excessive force when positioning cutting head into heavy
branches or small stumps (2” diameter). Damage to the unit may result.
It is best to let the cutter head “eat away” slowly at heavy cutting jobs.
The mower will operate more efficiently in tougher conditions and with less power
if the knives are kept sharp. If the mower begins to vibrate, stop the tractor, check for
wire wrapped in the spindle or damaged knives. When replacing knives, replace all
knives with new knives to ensure proper balance so the mower will not vibrate.
Severe vibration will result, if knives with unequal wear are used. Follow the
instructions in the maintenance section closely when replacing knife blades.
If bystanders approach within 300 feet while mower is in operation turn
mower switch “OFF” immediately! After shutdown, never leave the
tractor or allow bystanders to approach within 300 FEET of the unit until all
motion stops completely.