Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 70
Charge Hydraulic System
NOTE: Wheninitiallystartingthehydraulicsystemwith
neworrebuiltcomponentssuchaspumps,motorsorlift
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,stopengineandengageparkingbrake.Remove
key from the ignition switch.
2. Make sure all hydraulic connections, lines and com-
ponents are secured tightly.
3. Ifcomponentfailurewassevereorthesystemiscon-
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 s witch to start and engage starter for
ten(10) secondstoprimethetractionandgearpumps.
Let starter cool and then repeat cranking procedure
again.
8. Connect wire harness connector to engine run sole-
noid.
WARNING
Beforejackingupthemachine,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
andrunitatlowidle(1425rpm).Thepumpsshouldpick
up oil and fill the hydraulic system. If there is no indica-
tionof fillin30seconds,stoptheengine anddetermine
the cause.
11.After thehydraulic system starts to show signs of fill,
actuateliftcontrolswitchuntiltheliftcylinderrodsmove
inandoutseveraltimes.Ifthecylinderrodsdonotmove
after 15 seconds or the pump emits abnormal sounds,
shuttheengineoffimmediatelyanddetermine causeor
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.Operatethetractionpedalintheforwardandreverse
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 s witch.
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.Checkhydrauliccomponentsforleaksand
tighten any loose connections.
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