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Greensmaster 3320/3420 Hydraulic SystemPage 5 -- 49
Hydraulic System Start--up
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as wheel motors,
pumps or lift cylinders, it is important that this start--up
procedure be used. Thisprocedure reduces the chance
of damaging the hydraulic system or its components
from not purging the system of air.
1. After the hydraulic system components have been
properly installed and if the piston pump was rebuilt or
replaced,make surepistonpump housingis atleast half
full of clean hydraulic oil.
2. Makesureallhydraulic connectionsand linesare se-
cured tightly.
3. Make sure hydraulic reservoir is full. Add correct oil
if necessary.Drain, flush and refill hydraulic system res-
ervoir and change oil filter if component failure was se-
vere or system is contaminated.
4. Afterrepairs, check control linkage for proper adjust-
ment, binding or broken parts.
5. Disconnect cutting units from the electrical power
supply by separating the cutting unit power disconnect
couplers on the left side of the operator seat (Fig. 33).
This will prevent unexpected cutting unit operation dur-
ing hydraulic system start--up.
6. Make sure functional control lever is in the neutral
position.
7. Disconnect appropriate electrical component(s) to
prevent the engine from starting:
A. On machines with gasoline engine, disconnect
both spark plug wires from spark plugs.
B. On machines with diesel engine, disconnect wire
harness electrical connector from the engine fuel
stop solenoid.
8. Turn ignition key switch and engage starter for ten
(10) seconds to prime hydraulic pumps. Return ignition
switch to off and wait one (1) minute to a llow starter to
cool. Repeat step a second time.
9. Reconnectengine electrical component(s) thatwere
disabled in step 7 above.
10.Make sure functional control lever is in the neutral
position. Start engine and run at low idle speed. The
charge pump should pickup oiland fillthe hydraulicsys-
tem. If there is no indication of fill in thirty (30) seconds,
stop the engine and determine the cause.
11.After the hydraulic system starts to show signs of fill,
accomplish the following:
A. If the gear pump was replaced or rebuilt, run the
engine at low idle speed setting (under no load) for
ten (10) minutes.
B. If the piston pump or a wheel motor was replaced
or rebuilt, move functional control lever to the trans-
port position and run the traction unit so the wheels
turn slowly for t en (10) minutes.
12.Operate the machine (traction, steering and lift cir-
cuits) by gradually increasing the work load t o full over
a ten (10) minute period.
13.Stop the machine. Check hydraulic reservoir and fill
if necessary. Checkhydraulic componentsfor leaks and
tighten any loose connections.
14.Connect the cutting unit power d isconnect couplers
on the left side of the operator seat (Fig. 33).
1. Coupler 2. Stationary coupler
Figure 33
1
2
Hydraulic
System