Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such as pressure gauges and flow meters in the circuits
during various operational checks (see the Special
Tools section in this Chapter).
1. Clean machine thoroughly before disconnecting or
disassembling any hydraulic components. Always keep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of components.
Before Performing Hydraulic Tests
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
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.
3. The engine must be in good operating condition.
Engine speed will affect test accuracy. Check pump
speed with a phototac when performing hydraulic tests.
4.
The inlet and the outlet hoses must be properly con-
Precautions for Hydraulic Testing
nected and not reversed (tester with pressure and flow
capabilities)topreventdamagetothehydraulictesteror
components.
CAUTION
5.
When using tester with pressure and flow capabili-
ties, open load valve completely in the hydraulic tester
to minimize the possibility of damaging components.
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
6.
sure that they are not cross--threaded before tightening
them with a wrench.
Install fittings finger tight and far enough to make
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine, and the other should read and
record test results.
7.
Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
8.
necting test equipment, make sure tank is full.
Check oil level in the hydraulic reservoir. After con-
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch in OFF.Remove key from the igni-
tion switch.
9.
binding,or broken parts.
Check control linkages for improper adjustment,
10.
Allhydraulictestsshouldbemadewiththehydraulic
oil at normal operating temperature.
WARNING
11.
Record the results of all performed hydraulic tests.
Hydraulic Testing
Use the Hydraulic Schematic, Hydraulic Flow Dia-
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.
1.
grams, and the Troubleshooting section found in this
Chapter to assist in problem identification and solution.
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
fluid is injected into the skin, it must be surgical-
ly removed within a few hours by a doctor famil-
iar with this type of injury. Gangrene may result
from such an injury.
2. Hydraulic system problems (e.g. low hydraulic oil
level, contaminated oil, incorrect engine speed) will af-
fect the entire hydraulic system.
3.
go up an incline), consider performing the following hy-
draulic tests:
For traction related problems (e.g. machine will not
Charge Pressure Relief Valve (R4) Pressure Test
Wheel Motor Efficiency Test
Traction Drive Hydrostat (P3) Flow Test
Hydraulic System (Rev. I)
Page 4 -- 32
Greensmaster 3250--D
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