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.)
1. Thoroughly clean the machine before disconnecting
or disassembling any hydraulic components. Always
keep in mind the need for cleanliness when working on
hydraulic equipment.
2.
Put caps or plugs on any hydraulic lines left open or
exposed during testing or removal of components.
CAUTION
3.
The engine must be in good operating condition. Use
a tachometer when making a hydraulic test. Engine
speed can affect the accuracy of the tester readings.
Failure to use gauges with the recommended
pressure (psi) rating as listed in the test pro�
cedures could result in damage to the gauge
and possible personal injury from leaking hot
oil.
4.
To prevent damage to tester or components, the inlet
and the outlet hoses must be properly connected, and
not reversed (tester with pressure and flow capabilities).
Before Performing Hydraulic Tests
5. To minimize the possibility of damaging components,
completely open the load valve by turning it counter
clockwise (tester with pressure and flow capabilities).
All obvious areas such as oil supply, filter, binding
linkage, loose fasteners, or improper adjustments must
be checked before assuming that a hydraulic compo
nent is the source of the problem being experienced.
6. Install fittings finger tight, far enough to insure that
they are not cross-threaded, before tightening with a
wrench.
7.
parts will not make contact with them and result in hose
or tester damage.
Position the tester hoses so that rotating machine
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved by stopping the en�
gine and opening the bypass valve.
8.
Check the oil level in the reservoir.
9.
Check the control linkage for improper adjustment,
binding or broken parts.
Keep body and hands away from pin hole
leaks or nozzles that eject hydraulic fluid un�
der high pressure. Use paper or cardboard,
not hands, to search for leaks. Hydraulic fluid
escaping under pressure can have sufficient
force to penetrate skin and do serious dam�
age. 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 or gan�
grene may result.
10.
All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
Hydroject 3010
Page 4 - 9
Testing
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