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Groundsmaster 3505--D Hydraulic SystemPage 4 -- 5
Towing Traction Unit
In case of emergency, the Groundsmaster 3505--D can
be towed (or pushed) for a very short distance. Howev-
er, Toro does not recommend this as a standard proce-
dure.
1. Locate by--pass valve on hydrostat pump (Fig. 6)
and rotate it 90
o
to open the by--pass valve. This open
position should be horizontal (Fig. 7).
IMPORTANT: Do not tow (or push)the machine fast-
er than 2 to 3 mph because the drive system may be
damaged. If machinemust be moved aconsiderable
distance (more than a few feet), transport it on a
truck or trailer.
2. Slowly tow (or push) machine.
3. Before starting engine, close by--pass valve by rotat-
ing it 90
o
. This closed positionshould be vertical (Fig. 7).
Do not start engine when by--pass valve is open.
1. Hydrostat pump 2. By--pass valve
Figure 6
1
2
1. Va lve closed position 2. Valve open position
Figure 7
1
2
Relieving Hydraulic System Pressure
Before disconnecting or performing any work on the
Groundsmaster 3505--D hydraulic system, all pressure
in the hydraulic system must be relieved. Park machine
on a level surface with the cutting units lowered and off.
Turn key switch to OFF and allow engine to stop.
To relieve hydraulic pressure in traction circuit, move
traction lever to both forward and reverse directions. To
relieve hydraulic pressure in steering and lift circuits, ro-
tate steering wheel in both directions.
To relieve cutting unit system pressure, turn key switch
to ON (engine not running).Move PTO switch toengage
which will energizethe solenoid valve on hydraulicman-
ifold to relieve circuit pressure. Move PTO switch to dis-
engage, return key switch to OFF and remove key from
the ignition switch.
NOTE: Moving steering wheel with engine off may un-
seat implement relief valve. If steering or lift circuits ap-
pear weak or inoperative after machine is returned to
service, repeat relieving hydraulic system pressure pro-
cedure.
Hydraulic
System