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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 70
Charge Hydraulic System
NOTE: Wheninitially starting the hydraulic systemwith
new orrebuilt components suchas pumps,motors 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.
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
1. Park machine on a level surface. Lower cutting
decks, stop engineand engage parking brake.Remove
key from the ignition switch.
2. Make sure all hydraulic connections, lines and com-
ponents are secured tightly.
3. Ifcomponentfailurewas severeorthesystemiscon-
taminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System in this section).
4. Make sure hydraulic reservoir is full. Add correct hy-
draulic oil if necessary.
5. Disconnect wire harness connector from engine run
solenoid to prevent the engine from starting.
6. Check control rod to the piston (traction) pump for
proper adjustment, binding or broken parts.
7. Make sure traction pedal is in the neutral position.
Turn ignition key switch to start and engage starter for
ten (10)seconds to primethe traction andgear pumps.
Let starter cool and then repeat cranking procedure
again.
8. Connect wire harness connector to engine run s ole-
noid.
WARNING
Beforejacking upthemachine, reviewandfollow
Jacking Instructions in Chapter 1 -- Safety.
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.
10.Make sure traction pedal is in neutral. Start engine
and runit atlow idle(1425 rpm).The pumpsshould pick
up oil and fill the hydraulic system. If there is no indica-
tion of fillin 30 seconds, stop the engine anddetermine
the cause.
11.After the hydraulic system starts to show signs of fill,
actuate lift control switch until the lift cylinder rods move
in andout severaltimes. Ifthe cylinderrods do notmove
after 15 seconds or the pump emits abnormal sounds,
shut the engine off immediately and determinecause or
problem. Inspect for the following:
A. Loose filter or suction lines.
B. Blocked suction line.
C. Faulty charge relief valve.
D. Faulty gear pump.
12.Once lift cylinders do move, proceed to step 13.
13.Operatethe tractionpedalin theforwardand reverse
directions. The wheels off the ground should rotate in
the proper direction.
A. If the wheels rotate in the wrong direction, stop
engine and inspect hydraulic line placement at pis-
ton (traction) pump and wheel motors. Correct hy-
draulic line installation before proceeding.
B. If the wheels rotate in the proper direction, pro-
ceed with procedure.
14.Adjust traction pedal to the neutral position.
15.Check operation of the traction interlock switch.
16.Stop engine, remove blocks from frame and lower
machine. Remove chocks from remaining wheels.
17.If the piston (traction) pump or a traction motor was
replaced or rebuilt, run the machine so all wheels turn
slowly for ten (10) minutes.
18.Operate machine by gradually increasing its work
load to full over a ten (10) minute period.
19.Stop the machine. Check hydraulic reservoir and fill
ifnecessary.C heck hydrauliccomponents forleaks and
tighten any loose connections.