Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 36
Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
suchas pressuregaugesand flow metersinthe circuits
during various operational checks (see the Special
Tools s ection in this Chapter).
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners or improper
adjustmentsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
Precautions for Hydraulic Testing
CAUTION
Failure to use gauges with recommended pres-
sure (PSI/bar) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
WARNING
Keepbodyandhandsawayfrompinholeleaksor
nozzlesthateject hydraulicfluidunderhighpres-
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
withthis type ofinjury.Gangrenemay resultfrom
such an injury.
WARNING
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.
CAUTION
All t esting should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine, and the second person should
read test instruments and record test results.
1. Clean machine thoroughly before disconnecting or
disassemblinganyhydrauliccomponents.Alwayskeep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of components.
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
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.
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.
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.
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 rotating machine
partsfromcontactinganddamagingthehosesortester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure tank is full.
9. Check c ontrol 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.
11.Allhydraulictestsshouldbemadewiththehydraulic
oil at normal operating temperature.
12.Before returning machine to use,makesurethathy-
draulic reservoir has correct fluid level.
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