Understanding The Operating Characteristics Of The Machine; Understanding The 12 V And 24 V Electrical Systems; Automatic Reversing-Fan Cycle - Toro Groundsmaster 5900 Operator's Manual

Understanding the
Operating Characteristics
of the Machine
Practice driving the machine, as it has a hydrostatic
transmission, and its characteristics may differ from
other turf-maintenance machines.
With Toro Smart Power™, the operator does not have
to listen to the engine speed in heavy load conditions.
Smart Power prevents the engine from bogging
down in heavy cutting conditions by automatically
controlling the machine speed and optimizing cutting
performance.
If Toro Smart Power™ is disabled, to maintain enough
power for the traction unit and implement while
operating, regulate the traction pedal to keep the
engine speed (rpm) high and constant. Decrease the
ground speed as the load on the implement increases,
and increase the ground speed as the load decreases.
Allow the traction pedal to move backward as the
engine speed (rpm) decreases, and press the pedal
slowly as the engine speed increases. By comparison,
when driving between work areas, with no load and
the mower deck raised, set the throttle in the highest
position and press the traction pedal slowly, but fully,
to attain maximum ground speed.
Before stopping the engine, disengage all controls
and decrease the engine speed to L
rpm). Turn the ignition key to the O
off the engine.
Before transporting the machine, raise the mower
decks and secure the transport latches on the wing
mower deck (Figure 72).
Figure 72
1. Transport latch
Understanding the 12 V and
24 V Electrical Systems
This machine is designed with 2 voltage systems: 12
V and 24 V.
The 12 V system powers all functions of the
machine, except for the engine-cooling fans and
hydraulic-cooling fans. The 2 large 12 V batteries at
the rear, right corner of the machine are connected in
parallel to provide 12 V nominal. The 12 V engine
alternator charges these batteries.
The 24 V system powers the engine-cooling fans and
hydraulic-cooling fans. The 2 small 12 V batteries at
the rear, left corner of the machine are connected in
series to provide 24 V nominal. The 24 V alternator
charges these batteries.
The battery-disconnect switch is located at the rear,
right side of the machine. This switch can be used to
disconnect power from the batteries during service or
maintenance procedures.
Automatic Reversing-Fan
Cycle
The hydraulic-fan speed is controlled by hydraulic-oil
temperature. The radiator-fan speed is controlled
by the engine-coolant temperature. A reverse cycle
I (1,000
OW DLE automatically initiates when either the engine coolant
position to shut
FF
or hydraulic-oil temperature reaches a certain point.
This reversal blows debris off the screens, lowering
the engine and hydraulic-oil temperatures
73). Additionally, the radiator fans perform a reverse
cycle every 21 minutes regardless of the coolant
temperature.
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56
G010392
Figure 73
(Figure
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