Testing - Toro GroundsmasterR 4300-D Service Manual

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).
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.
Precautions for Hydraulic Testing
CAUTION
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.
CAUTION
All testing should be performed by two (2)
people. One person should be in the seat to oper-
ate the machine and the other should read and
record test results.
WARNING
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
fluid is injected into the skin, it must be surgical-
ly removed within a few hours by a doctor famil-
iar with this type of injury. Gangrene may result
from such an injury.
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
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. 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 system
must be relieved. See Relieving Hydraulic Sys-
tem Pressure in the General Information section
of this chapter.
5. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or component removal.
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.
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.
8. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
9. After connecting test equipment, check oil level in
the hydraulic tank to make sure that oil level is correct.
10.When using hydraulic tester (pressure and flow),
open tester load valve completely before starting engine
to minimize the possibility of damaging components.
11. The engine must be in good operating condition. 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.
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WARNING
Groundsmaster 4300--D