Toro GROUNDSMASTER 580-D 30581 Operator's Manual page 25

may occur. The by-pass valve must be open whenever
the machine is pushed or towed by this method. TORO
does not recommend this process be used as standard
procedure.
1. The by-pass valve is located on the left side of the
pump (Fig. 29). Rotate the valve 1/2 to 1 turn
counter- clockwise to open it and allow oil to
bypass internally. Because fluid is bypassed, the
machine can be moved—slowly—without damaging
the transmission.
2. Rotate the valve clockwise until it is securely seated
before starting the engine. However, do not exceed
7–11 Nm torque to close the valve.
IMPORTANT: Running the engine with the
by-pass valve open will cause the transmission to
overheat.
1. By-pass valve
Unlocked Hub Method
1. Either block the wheels or connect the machine to a
towing vehicle with a rigid towing device.
2. Remove the bolts securing the disengage covers to
The vehicle will roll with the front wheel hubs
disengaged. The vehicle must be on a level surface or
wheels must be blocked. There is no effective
braking with the wheel hubs disengaged.
both front wheel hubs.
3. Face the dimpled portion of the disengaged covers
inward and reinstall the covers. The wheel hubs are
Figure 29
DANGER
now unlocked.
4. Lock the wheel hubs immediately after completing
towing operations. Remove the covers and reinstall
them with the dimpled portion facing away from the
wheel hubs.
Do not remove wheel blocks or towing devices until
the wheel hubs are securely locked.
OPERATING CHARACTERISTICS
Familiarization—Before mowing for the first time,
practice operating in a large, open and relatively level area.
Start and stop the engine, operate in forward and reverse in
LOW RANGE ground speed. Practice using the cruise
control. Lower and raise the cutting units individually and
simultaneously. When thoroughly familiar with machine
functions, practice operating around trees and obstacles
while using the individual wheel brakes. Also operate up
and down slopes (IN LOW RANGE).
Note: TORO recommends HIGH RANGE ground speed be
used for road travel only (with cutting units up)
Points to consider while operating the traction unit, cutting
units or other implements are the hydrostatic transmission,
engine speed, load on the cutting blades or other implement
components and the importance of the brakes. To maintain
adequate power for the traction unit and implement
components while operating, regulate the traction pedal
position to keep engine rpm high and relatively constant.
Good rules to follow are: decrease ground speed as the
implement load increases, and increase ground speed as the
load decreases.
Warning Systems—If a warning light and audible warning
come on during operation, stop immediately and correct the
problem before continuing. Serious damage could occur if
the machine is operated with an uncorrected problem.
However, if the engine stops because of overheating, the
emergency over-ride button can be used to operate the
engine for short intervals (Fig. 30).
CAUTION
Operation
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