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Figure 27
1. Transmission check valve by–pass pins (2)
3. Start the engine momentarily after the repairs are
completed and make sure the pins are in the full
disengaged (fully up) position.
Important: Running the machine with by-pass
valve open will cause the transmission to
overheat.
4. Reinstall the access cover.
Operating Characteristics
Practice driving the GROUNDSMASTER 3320
before initial operation because it has a hydrostatic
transmission and its characteristics are different than
some turf maintenance machines. Some points to
consider when operating the traction unit and deck
are the transmission, engine speed, load on the cutting
blades, and the importance of the brakes.
To maintain enough power for the traction unit and
deck while mowing, regulate traction pedal to keep
engine rpm high and somewhat constant. A good
rule to follow is: decrease ground speed as the load
on the cutting blades increases; and increase ground
speed as load on the blades decreases. This allows the
engine, working with the transmission, to sense the
proper ground speed while maintaining high blade tip
speed necessary for good quality-of-cut. Therefore,
allow traction pedal to move upward as engine speed
decreases, and depress pedal slowly as speed increases.
By comparison, when driving from one work area to
another—with no load and deck raised—have throttle
in FAST position and depress traction pedal slowly but
fully to attain maximum ground speed.
This machine produces sound levels in excess
of 85dBA at the operators ear and can cause
hearing loss through extended periods of
exposure.
Wear hearing protection when operating this
machine.
Adequate rear weight is necessary to prevent
the rear wheels from leaving the ground. Do
not stop suddenly while deck or implement is
raised. Do not travel down hill with the deck or
implement raised. If the rear wheel leaves the
ground, steering is lost.
Another characteristic to consider is the operation of
the brakes. The brakes can be used to assist in turning
the machine; however, use them carefully, especially
on soft or wet grass because the turf may be torn
accidentally. The brakes can be used to great advantage
to control the direction of the deck when trimming
along fences or similar objects. The other benefit of
the brakes is to maintain traction. For example; in
some slope conditions, the uphill wheel slips and loses
traction. If this situation occurs, depress uphill brake
pedal gradually and intermittently until the uphill wheel
stops slipping; thus, increasing traction on the downhill
wheel. If independent braking is not desired, engage
the lever on left brake pedal with right pedal. This
provides simultaneous braking at both wheels.
Before stopping the engine, disengage all control and
move throttle to SLOW. Moving throttle to SLOW
reduces high engine speed, noise and vibration. Turn
ignition key to OFF to stop the engine.
Standard Control Module
(SCM)
The Standard Control Module is a "potted" electronic
device produced in a "one size fits all" configuration.
The module uses solid state and mechanical
components to monitor and control standard electrical
features required for safe product operation.
The module monitors inputs including neutral, parking
brake, PTO, start, backlap, and high temperature. The
module energizes outputs including PTO, Starter, and
ETR (energize to run) solenoid.
28
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