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).
2. Review all test steps before starting the test proce-
dure.
3.
Before testing, check all control linkages for improp-
er adjustment, binding or broken parts.
4.
oil at normal operating temperature.
All hydraulic tests should be made with the hydraulic
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
oil filter, binding linkages, loose fasteners or im-
proper adjustments must be checked before as-
suming that a hydraulic component is the source of
a problem.
WARNING
Beforedisconnecting orperforming anyworkon
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic Sys-
tem Pressure in the General Information section
of this chapter.
Precautions for Hydraulic Testing
CAUTION
5.
open or exposed during testing or component removal.
Put metal caps or plugs on any hydraulic lines left
Failure to use gauges with expected pressure
(psi/bar) rating as listed in test procedures could
result in damage to the gauge and possible per-
sonal injury from leaking hot oil.
6.
When using hydraulic tester (pressure and flow), the
inlet and the outlet hoses must be properly connected
and not reversed to prevent damage to the hydraulic
tester or components.
CAUTION
7.
Install hydraulic fittings finger tight and far enough to
makesurethattheyarenotcross--threadedbeforetight-
ening them with a wrench.
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine and the other should read and
record test results.
8.
Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
9.
the hydraulic tank to make sure that oil level is correct.
After connecting test equipment, check oil level in
WARNING
10.When
using hydraulic tester (pressure and flow),
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.
opentesterloadvalvecompletelybeforestartingengine
to minimize the possibility of damaging components.
11.
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 hy-
draulic flow tests.
12.After
hydraulic test procedures have been com-
pleted, check oil level in the hydraulic tank to make sure
that oil level is correct.
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 can cause excessive
wear or binding of hydraulic components.
Hydraulic System
Page 4 -- 32
Groundsmaster 4300--D
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