Charge Hydraulic System
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as motors, pumps, or
lift cylinders, it is important that the hydraulic system be
charged properly. Air must be purged from the system
and its components to reduce the chance of damage.
11.After the hydraulic system starts to show signs of fill,
actuate lift control lever until the lift cylinder rod moves
in and out several times. If the cylinder rod does not
move after 10 to 15 seconds, or the pump emits abnor-
mal sounds, shut the engine off immediately and deter-
mine cause or problem. Inspect for the following:
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
A. Loose filter or suction lines.
B. Blocked suction line.
C. Faulty charge relief valve.
D. Faulty gear pump.
1.
stop engine, and engage parking brake. Remove key
from the ignition switch.
Park machineonalevelsurface.Lower cuttingunits,
2.
Make sure all hydraulic connections, lines, and com-
ponents are secured tightly.
12.If
cylinder does move in 10 to 15 seconds, proceed
to step 13.
3.
Ifcomponentfailurewassevereorthesystemiscon-
taminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System).
13.Operate
directions. The wheels off the ground should rotate in
the proper direction.
thetractionpedalintheforwardandreverse
4.
Make sure hydraulic reservoir is full. Add correct hy-
draulic oil if necessary (see Traction Unit Operator’s
Manual).
A. If the wheels rotate in the wrong direction, stop
engine, remove lines from bottom of piston (traction)
pump, and reverse the connections.
5.
Disconnect engine run solenoid lead to prevent the
engine from starting.
B. If the wheels rotate in the proper direction, stop
engine.
6.
Check control rod to the piston (traction) pump for
proper adjustment, binding, or broken parts.
14.Adjust
traction pedal to the neutral position (see
Traction Unit Operator’s Manual).
7.
Make sure traction pedal and lift control lever are in
the neutral position. Turn ignition key switch; engage
starterforfifteen(15)secondstoprimethetractionand
gear pumps.
15.Check
Traction Unit Operator’s Manual).
operation of the traction interlock switch (see
16.Remove
move chocks from remaining wheels.
blocks from frame and lower machine. Re-
8.
Reconnect engine run solenoid lead.
17.If
replaced or rebuilt, run the machine so all wheels turn
slowly for 10 minutes.
the piston (traction) pump or a traction motor was
WARNING
Beforejackingupthemachine,reviewandfollow
Jacking Instructions in Chapter 1 -- Safety.
18.Operate
load to full over a 10 minute period.
machine by gradually increasing its work
9.
Raise one front and one rear wheel off the ground,
and place support blocks under the frame. Chock re-
maining wheels to prevent movement of the machine.
19.Stop
ifnecessary.Check hydraulic components for leaks and
tighten any loose connections.
the machine. Check hydraulic reservoir and fill
10.Make
sure traction pedal and lift control lever are in
neutral. Start engine and run it at low idle (1300 rpm).
The charge pump should pick up oil and fill the hydraulic
system.Ifthereisnoindicationoffillin30seconds ,stop
the engine and determine the cause.
Hydraulic System (Rev. A)
Page 4 -- 54
Groundsmaster 4500--D/4700--D
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