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 hydraulic 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.
Theinletandtheoutlethosesfortesterwithpressure
and flow capabilities must be properly connected and
not reversed to prevent damage to the hydraulic tester
or components.
Failure to use gauges with recommended pres-
sure (PSI) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
5.
capabilities, open load valve completely in the tester to
minimize the possibility of damaging components.
When using hydraulic tester with pressure and flow
WARNING
6. Install tester fittings finger tight and far enough to
makesurethattheyarenotcross--threadedbeforetight-
ening them with a wrench.
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;
usepaperorcardboard.Hydraulic fluidescaping
underpressurecanhavesufficientforcetopene-
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
withthistypeofinjury.Gangrenemayresultfrom
such an injury.
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.
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.
oil at normal operating temperature.
All hydraulic tests should be made with the hydraulic
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. Also, check for
hydraulic leaks after test equipment has been removed
from hydraulic system.
CAUTION
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine and the second person should
read and record test results.
Hydraulic System
Page 4 -- 36
Groundsmaster 4100--D/4110--D
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