Testing; Testing; Precautions For Hydraulic Testing - Toro 04384 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,
filter, binding linkages, loose fasteners, improper
adjustments, solenoid valve operation or electrical
connections/circuits must be checked before as-
suming that a hydraulic component is the source of
the problem.

Precautions for Hydraulic Testing

CAUTION
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
could result in damage to the gauge and possible
personal injury from leaking hot oil.
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.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch in OFF. Remove key from the igni-
tion switch.
WARNING
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved and all rotating machine parts
must be stopped. Stop engine; lower or support
attachments.
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.
Hydraulic System
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 system components.
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
3. The engine must be in good operating condition. En-
gine speed will affect hydraulic test accuracy. Check
pump speed with a phototac when performing hydraulic
tests.
4. When using tester with pressure and flow capabili-
ties, the tester inlet and the outlet hoses must be proper-
ly connected and not reversed to prevent damage to the
hydraulic tester or other components.
5. When using tester with pressure and flow capabili-
ties, open the hydraulic tester load valve completely to
minimize the possibility 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 all moving machine
parts from contacting and damaging the hoses or tester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure reservoir is full.
9. Check control linkages for improper adjustment,
binding components or broken parts.
10.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
11. Record the results of all performed hydraulic tests.
Hydraulic Testing
1. Use the hydraulic schematic, hydraulic flow dia-
grams and the Troubleshooting section found in this
chapter to assist in hydraulic system problem identifica-
tion and solution.
2. Hydraulic system problems (e.g. low hydraulic oil
level, contaminated oil, incorrect engine speed) will af-
fect the entire hydraulic system.
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