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).
3. Before testing, check traction control lever linkages
for improper adjustment, binding or broken parts.
4.
All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
Before Performing Hydraulic Tests
WARNING
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
the problem.
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic System
Pressure in the General Information section.
Precautions for Hydraulic Testing
5.
Put clean metal caps or plugs on any hydraulic lines
left open or exposed during testing or component re-
moval.
CAUTION
6.
When using hydraulic tester (pressure and flow), the
Failure to use gauges with expected pressure
(psi) rating as listed in test procedures could re-
sult in damage to the gauge and possible person-
al injury from leaking hot oil.
inlet and the outlet hoses must be properly connected
and not reversed to prevent damage to the hydraulic
tester or components.
7.
Install hydraulic fittings finger tight and far enough to
make sure that they are not cross–threaded before tight-
ening them with a wrench.
CAUTION
8.
parts from contacting and damaging the hoses or tester.
Position tester hoses to prevent rotating machine
All testing should be performed by two (2)
people. One person should be in the seat to oper-
ate the machine. The second person should
monitor test equipment and record test results.
9.
the hydraulic tank to make sure that oil level is correct.
After connecting test equipment, check oil level in
10.When
open tester load valve completely before starting engine
to minimize the possibility of damaging components.
using hydraulic tester (pressure and flow),
WARNING
Keep body and hands away from pin hole leaks or
nozzles that eject hydraulic fluid under high pres-
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.
11.The engine must be in good operating condition. En-
gine speed can affect the accuracy of the hydraulic test-
er readings. When performing hydraulic tests, check
engine speed with a phototac.
12.If
a traction circuit problem exists, consider perform-
ing one or more of the following tests: Charge Relief
Valve Pressure, Transmission Piston Pump Flow, Trac-
tion Relief Valve Pressure and/or Wheel Motor Efficien-
cy.
13.If
a lift circuit problem exists, consider performing
1.
Clean machine thoroughly before disconnecting or
one or more of the following tests: Implement Relief
Pressure, Gear Pump Flow and/or Lift Cylinder Internal
Leakage.
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.
14.If
a PTO circuit problem exists, consider performing
the PTO Pressure Valve Test.
2.
When conducting tests on the hydraulic system,
wear eye protection.
Hydraulic System
Page 4 – 24
Groundsmaster 7200/7210
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