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).
WARNING
Before disconnecting or performing any work on
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.
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners or improper
adjustmentsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
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. Hydraulic system contamination will
cause excessive wear of hydraulic components.
Precautions for Hydraulic Testing
CAUTION
2.
open or exposed during testing or removal of compo-
nents.
Put metal caps or plugs on all hydraulic lines left
Failure to use gauges with recommended pres-
sure (PSI) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
3.
Theenginemustbeingoodoperatingcondition.Use
a phototac to determine engine speed when performing
a hydraulic test. Engine speed will affectthe accuracy of
the tester readings.
CAUTION
4.
When using hydraulic tester with pressure and flow
capabilities, the inlet and the outlet hoses must be prop-
erly connected and not reversed to prevent damage to
the hydraulic tester or machine components.
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine and the other should read and
record test results.
5.
capabilities, open load valve completely in the tester to
minimize the possibility of damaging components.
When using hydraulic tester with pressure and flow
CAUTION
6.
sure that they are not cross--threaded before tightening
them with a wrench.
Install fittings finger tight and far enough to make
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulicoil.SeeRelievingHydraulic SystemPres-
sure in the General Information section of this
chapter.
7. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure tank is full.
9.
binding or broken parts.
Check control linkages for improper adjustment,
WARNING
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-
ly removed within a few hours by a doctor famil-
iar with this type of injury. Gangrene may result
from such an injury.
10.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
11.Before returning machine to use, make sure that hy-
draulic reservoir has correct fluid level.
Groundsmaster 4500--D/4700--D
Page 4 -- 41
Hydraulic System
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