Hydraulic System Start--Up - Toro Groundsmaster 3280-D Service Manual

Hydraulic System Start- -up
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as pumps or lift cylin-
ders, it is important that this start--up procedure be used.
This procedure reduces the chance of damaging the
system or its components from not purging the system
of air.
1. After the hydraulic system components have been
properly installed and if the hydrostatic transmission
was rebuilt or replaced, make sure hydrostat housing is
at least half full of clean hydraulic oil.
2. Make sure all hydraulic connections and lines are se-
cured tightly.
3. Drain, flush and refill hydraulic system and change
hydraulic oil filter if component failure was severe or sys-
tem is contaminated (See Flush Hydraulic System in
this section).
4. Make sure hydraulic reservoir (front axle) is full. Add
correct oil if necessary (see Traction Unit Operator's
Manual).
5. Check control linkage for proper adjustment, binding
or broken parts.
6. Perform the following to prevent engine from start-
ing:
A. Disconnect electrical connector to the fuel stop
solenoid on Groundsmaster 3280--D machines.
B. Disconnect and ground all engine spark plug wi-
res on Groundsmaster 3320 machines.
Hydraulic System
7. Make sure traction pedal is in neutral and the P.T.O.
switch is off. Turn ignition key switch to start; engage
starter for ten (10) seconds to prime hydraulic pump.
8. Connect fuel
3280--D) or spark plug wires (Groundsmaster 3320) to
allow engine to start.
9. Make sure traction pedal is in neutral and the P.T.O.
switch is off. Start engine and run it at low idle. The
charge pump should pick up oil and fill the hydraulic sys-
tem. If there is no indication of fill in 30 seconds, stop the
engine and determine the cause.
10.If the hydrostat was replaced or rebuilt, run the trac-
tion unit so the wheels turn slowly for 10 minutes.
11. Operate the traction unit (including steering and cut-
ting deck lift/lower) by gradually increasing the work
load to full over a 10 minute period.
12.Stop the machine. Check hydraulic reservoir (front
axle) level and fill if necessary. Check hydraulic compo-
nents for leaks and tighten any loose connections.
Page 5 - - 30
stop solenoid (Groundsmaster
Groundsmaster 3280--D/3320