Greensmaster 3300/3400Hydraulic System Page 5 -- 32
Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
suchas pressuregaugesandflowmetersin thecircuits
during various operational checks (see the Special
Tools section in this Chapter).
IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners, improper
adjustments, solenoid valve operation or electrical
connectionsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
Beforedisconnecting orperforming any workon
the hydraulic system, all pressure in the system
must be relieved and all rotating machine parts
must be stopped. See Relieving Hydraulic Sys-
tem Pressure in theGeneral Informationsection.
WARNING
CAUTION
Failure to use gauges w ith recommended pres-
sure (PSI) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
CAUTION
All t esting should be performed by two ( 2)
people.Onepersonshouldbeintheseattooper-
ate the machine and the other should monitor
testing equipment and record test results.
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 can have sufficient force to
penetrate the skin and cause serious injury. If
fluidisinjectedintotheskin,itmustbesurgical-
lyremoved within af ew hoursbya doctorf amil-
iar with this type of injury. Gangrene may result
from such an injury.
WARNING
Precautions for Hydraulic Testing
1. Clean machine thoroughly before disconnecting or
disassemblinganyhydrauliccomponents.Alwayskeep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of components.
2. Topreventhydraulicsystemcontamination,putmet-
al caps or plugs on any hydraulic lines left open or ex-
posed during testing or removal of components.
3. Theenginemustbeingoodoperatingcondition.En-
ginespeed willaffecttestaccuracy.Check pumpspeed
with a phototac when performing hydraulic tests.
4. When using tester with pressure and flow capabili-
ties,theinletandtheoutlethosesmustbeproperlycon-
nected and not reversed to prevent damage to the
hydraulic tester or other 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 thatthey 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 c ontrol linkages for improper adjustment,
binding or broken parts.
10.Allhydraulic testsshouldbemadewiththehydraulic
oil at normal operating temperature.
11.Record the results of all performed hydraulic tests.
Which Hydraulic Tests Are Necessary?
Before beginning anyhydraulic test, identify iftheprob-
lemisrelatedtothetractioncircuit,mowcircuit,lift/lower
circuit or steering circuit. Once the faulty system has
been identified, perform tests that relate to that circuit.
1. Use the Hydraulic Schematic, Hydraulic Flow Dia-
grams and the Troubleshooting section found in this
Chapterto assistin hydraulicproblemidentificationand
solution.
2. Hydraulic system problems ( e.g. low hydraulic oil
level, contaminated oil, incorrect engine speed) will af-
fect the entire hydraulic system.
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