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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 hydrau-
lic circuits during various operational checks (See the
Special Tools section in this Chapter).
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as hydraulic
oil supply, oil filter, binding linkages, loose fasten-
ers, or improper adjustments must be checked be-
fore assuming that a hydraulic component is the
source of a hydraulic problem.
Before performing any work on the hydraulic
system pressure.
WARNING
system, system pressure must be relieved and
all rotating machine parts must come to a stop.
Turn ignition switch OFF and remove key from
switch. When engine has stopped rotating, op-
erate all hydraulic controls to relieve hydraulic
Precautions for Hydraulic Testing
CAUTION
sure (PSI) rating as listed in test procedures
personal injury from leaking hot oil.
escaping under pressure can have sufficient
force to penetrate the skin and cause serious
Failure to use gauges with recommended pres-
could result in damage to the gauge and possible
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
injury. If fluid is injected into the skin, it must
be surgically removed within a few hours by a
doctor familiar with this type of injury. Gan-
grene may result from such an injury.
CAUTION
All testing should be performed by two (2)
ate the machine, and the other person should
read and record test results.
people. One person should be in the seat to oper-
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.
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. Use
a phototac to check engine speed when performing a
hydraulic test. Engine speed will affect the accuracy of
the tester readings.
4. The inlet and the outlet hoses for tester with pressure
and flow capabilities must be properly connected. If
hoses are reversed, damage to the hydraulic tester or
components can occur.
5. When using hydraulic tester with pressure and flow
capabilities, completely open tester load valve before
starting engine to minimize the possibility of damage to
components.
6. Install tester fittings finger tight and far enough to
make sure that they are not cross–threaded before tight-
ening them with a wrench.
7. Position tester hoses to prevent rotating 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, or broken parts.
10.After installing test gauges, run engine at low speed
and check for any hydraulic oil leaks.
11. All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
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.
Hydraulic System Page 4 – 16 Multi Pro 5700–D