Greensmaster 3250--DHydraulic System Page 4 -- 28
Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such as pressure gauges and flow m eters in thecircuits
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 component is the source of
the problem.
Precautions for Hydraulic Testing
CAUTION
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
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 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
ignitionswitchinOFF.Removekey fromthe igni-
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 seri ous injury. If
fluid isinjected into theskin,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
disassemblingany hydrauliccomponents.Alwayskeep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of hydraulic system components.
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
3. Theenginemust be ingoodoperatingcondition.En-
gine speed will affect hydraulic test accuracy. Check
pumpspeedwithaphototacwhenperformingh ydraulic
tests.
4. When using tester with pressure and flow capabili-
ties,thetesterinletandtheoutlethosesmustbeproper-
lyconnectedandnotreversedto preventdamagetothe
hydraulic tester or other components.
5. When using tester with pressure and flow capabili-
ties, open the hydraulic tester load valve completely to
minimize the possibility of damaging components.
6. Install fittings finger tight and far enough to make
sure that they are not cross--threaded before tightening
them with a wrench.
7. Position tester hoses to prevent all moving machine
partsfromcontactinganddamagingthehosesortester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure reservoir is full.
9. Check control linkages for improper adjustment,
binding components or broken parts.
10.All hydraulictestsshould be 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 hydraulic system problem identifica-
tion and 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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