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 ma-
chine parts must be stopped. Stop engine;
lower or support attachments.
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter,bindinglinkages, loosefasteners, orimproper
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. Contamination will cause excessive
wear of components.
Precautions for Hydraulic Testing
CAUTION
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
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 can affect the accuracy
of the tester readings. Check actual speed of the pump
when performing flow testing.
CAUTION
4.
The inlet and the outlet hoses must be properly con-
nected and not reversed (tester with pressure and flow
capabilities)topreventdamagetothehydraulictesteror
components.
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine, and the other should read and
record test results.
5. When using hydraulic tester with pressure and flow
capabilities, open load valve completely in the tester to
minimize the possibility of damaging components.
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-
draulic oil. Controls must be operated with the
ignition switch inOFF.Remove key from the igni-
tion switch.
7.
parts from contacting and damaging the hoses or tester.
Position tester hoses to prevent rotating machine
8.
Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure tank is full.
WARNING
9.
binding, or broken parts.
Check control linkages for improper adjustment,
Keepbodyandhandsawayfrompinholeleaks
or nozzles that eject hydraulic fluid under high
pressure. Do not use hands to search for
leaks; use paper or cardboard. Hydraulic fluid
escaping under pressure can have sufficient
force to penetrate the skin and cause serious
injury. If fluid is injected into the skin, it must
be surgically removed within a few hours by a
doctor familiar with this type of injury. Gan-
grene may result from such an injury.
10.All
oil at normal operating temperature.
hydraulic tests should be made with the hydraulic
11.
Before returning machine to use, make sure that hy-
draulic reservoir has correct fluid level.
Groundsmaster 4500--D/4700--D
Page 4 -- 25
Hydraulic System (Rev. A)
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