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 or improper
adjustmentsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
3. Theenginemustbeingoodoperatingcondition.Use
a phototac 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.
Precautions for Hydraulic Testing
CAUTION
4.
When using the hydraulic tester with flow and pres-
sure capabilities, the inlet and the outlet hoses must be
properly connected and not reversed to prevent dam-
age to the hydraulic tester or components.
Failure to use gauges with recommended pres-
sure (PSI/bar) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
5.
When using the hydraulic tester with flow and pres-
sure capabilities, completely open flow control valve on
tester before starting the engine to minimize the possi-
bility of damaging components.
WARNING
6.
Install fittings finger tight and far enough to make
sure that they are not cross--threaded before tightening
them with a wrench.
Keep body and hands awayfrompinhole leaksor
nozzles that eject hydraulic fluid under highpres-
sure. Do not use hands to search for leaks; use
paper or cardboard. Hydraulic fluid escaping un-
der pressure can have sufficient force to pene-
trate the skin and cause serious injury. If fluid is
injected into the skin, it must be surgically re-
moved within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.
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-
9.
Check control linkages for improper adjustment,
binding or broken parts.
10.After
installing test gauges, run engine at low speed
and check for any hydraulic oil leaks.
WARNING
11.
All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
Before disconnecting or performing any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
SystemPressureintheGeneralInformationsec-
tion in this chapter.
12.Before returning machine to use, make sure that hy-
draulic reservoir has correct fluid level.
CAUTION
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine, and the second person should
read test instruments and record test results.
Hydraulic System
Page 4 -- 36
Groundsmaster 4000--D/4010--D
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