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.
10.Make sure traction pedal and lift control lever are in
neutral. Start engine and run it at low idle of 1800 rpm.
The charge pump should pick up oil and fill the hydraulic
system. If there is no indication of fill in 30 seconds, stop
the engine and determine the cause.
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
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:
1.
Park machine on a level surface and turn engine off.
2.
Make sure all hydraulic connections, lines, and com-
ponents are secured tightly.
Ifcomponentfailurewassevereorthesystemiscon-
A. Loose filter or suction lines.
B. Incorrect hydraulic hose routing.
C. Loose or faulty coupler on the pump.
D. Blocked suction line.
3.
taminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System).
4.
essary (see Check Hydraulic System Fluid).
Makesurehydraulic tankisfull.Addcorrectoilifnec-
5.
Disconnect fuel stop solenoid lead to prevent the en-
E. Faulty charge relief valve.
gine from starting.
F. Faulty charge pump (Gear Pump P2).
6.
justment, binding, or broken parts.
Check control cable to the hydrostat for proper ad-
12.If
step 13.
cylinder moves in 10 to 15 seconds, proceed to
7.
Make sure traction pedal and the lift control lever are
13.Operate
directions. The wheels off the floor should rotate in the
proper direction.
thetractionpedalintheforwardandreverse
in the neutral position. Turn ignition key switch and en-
gage starter for ten (10) seconds to prime the traction
and gear pumps. Wait fifteen (15) seconds to allow the
starter motor to cool and then repeat cranking proce-
dure again.
A. If the wheels rotate in the wrong direction, stop
engine, remove lines from rear of hydrostat pump,
and reverse the connections.
8.
Reconnect fuel stop solenoid lead.
B. If the wheels rotate in the proper direction, stop
engine.
WARNING
14.Adjust
traction pedal to the neutral position (see Ad-
Beforejackingupthemachine,reviewandfollow
Jacking Instructions in Chapter 1 -- Safety.
just Traction Drive for Neutral).
15.Check
operation of the traction interlock switch (see
Check Interlock System in Chapter -- 5, Electrical Sys-
tems).
9.
Raiseonefrontandrearwheeloffthefloor,andplace
support blocks under the frame. Chock remaining front
wheel to prevent movement of the machine.
16.Remove
blocksfromwheelsandlowermachine.Re-
move chocks from remaining wheel.
CAUTION
17.If
or rebuilt, run the traction unit so all wheels turn slowly
for 10 minutes.
the traction pump or a wheel motor was replaced
One front wheel and the rear wheel will be off the
ground during testing. Make sure machine is
supported so it will not move and accidentally
fall to prevent injuring anyone under machine.
18.Operate
load to full over a 10 minute period.
traction unitby gradually increasing itswork
19.Stop
the machine. Check hydraulic tank and fill if
necessary. Check hydraulic components for leaks and
tighten any loose connections.
Groundsmaster 3500--D
Page 4 -- 61 Rev. F
Hydraulic System (Rev. D)
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