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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 GROUNDSMASTERr 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.
Caution
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.
Caution
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.
The module is divided into inputs and outputs. Inputs and
outputs are identified by yellow LED indicators mounted
on the printed circuit board.
The start circuit input is energized by 12 VDC. All other
inputs are energized when the circuit is closed to ground.
Each input has a LED that is illuminated when the specific
circuit is energized. Use the input LED's for switch and
input circuit troubleshooting.
Output circuits are energized by an appropriate set of input
conditions. The three outputs include PTO, ETR, and
START. Output LED's monitor relay condition indicating
the presence of voltage at one of three specific output
terminals.
Output circuits do not determine output device integrity so
electrical troubleshooting includes output LED inspection
and conventional device and wire harness integrity testing.
Measure disconnected component impedance, impedance
through wire harness (disconnect at SCM), or by
temporarily "test energizing" the specific component.
The SCM does not connect to an external computer or hand
held device, can not be re–programmed, and does not
record intermittent fault troubleshooting data.
The decal on the SCM only includes symbols. Three LED
output symbols are shown in the output box. All other
LED's are inputs. The chart below identifies the symbols.
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