Greensmaster 3150Hydraulic System Page 4 -- 26
Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such aspressure gaugesand flowmeters inthe circuits
during various operational checks (see the Special
Tools section in this Chapter).
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners, improper
adjustments, solenoid valve operation or electrical
connections/circuits must be checked before as-
suming that a hydraulic componentis thesource of
the problem.
Precautions for Hydraulic Testing
CAUTION
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
couldresultind amagetothegaugeandpossible
personal injury from leaking hot oil.
All testing should be performed by two (2)
people.Onepersonshouldbein theseattooper -
ate the machine and the other should read test-
ing tools (e.g. pressure gauge) and record test
results.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignitionswitchin OFF.Removekeyfromtheigni-
tion switch.
WARNING
Beforedisconnectingorperforminganyworkon
the hydraulic system, all pressure in the system
must be relieved and all rotating machine parts
must be stopped. Stop engine; lower or support
attachments.
Keep body and hands away from pin hole leaks
or nozzles that eject hydraulic fluid under high
pressure. Do not use hands to search for leaks;
use paper or cardboard. Hydraulic fluid escap-
ing under pressure c an have sufficient force to
penetrate the skin and cause serious injury. If
fluid is injec ted intothe skin, it mustbe surgical-
ly removed within a few hours by a doctor famil-
iar with this type of injury. Gangrene may result
from such an injury.
1. Clean machine thoroughly before disconnecting or
disassemblinganyhydraulic components.Always keep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of components.
2. Toprevent hydraulicsystem contamination,putmet-
al caps or plugs on any hydraulic lines left open or ex-
posed during testing or removal of components.
3. Theenginemustbe ingoodoperatingcondition.En-
ginespeed willaffecttest accuracy. Checkpump speed
with a phototac when performing hydraulic tests.
4. When using tester with pressure and flow capabili-
ties,theinletand theoutlethosesmustbeproperly con-
nected and not reversed to prevent damage to the
hydraulic tester or components.
5. When using tester with pressure and flow capabili-
ties, completely open load valve in the hydraulic tester
to minimize the possibility of damaging components.
6. Install fittings finger tight and far enough to make
sure that they are notcross--threaded before tightening
them with a wrench.
7. Position tester hoses to prevent rotating machine
partsfromcontactinganddamagingthehosesortester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure tank is full.
9. Check control linkages for improper adjustment,
binding,or broken parts.
10.All hydraulictests shouldb e madewith thehydraulic
oil at normal operating temperature.
11.Record the results of all performed hydraulic tests.
Hydraulic Testing
1. Use the Hydraulic Schematic, Hydraulic Flow Dia-
grams and the Troubleshooting section found in this
Chapter to assist in problem identification and solution.
2. Hydraulic system problems ( e.g. low hydraulic oil
level, contaminated oil, incorrect engine speed) will af-
fect the entire hydraulic system.
3. For traction related problems (e.g. machine will not
go up an incline), consider performing the following hy-
draulic tests:
Charge Pressure Relief Valve Pressure Test
Wheel Motor Efficiency Test
Piston (Traction) Pump Flow Test
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