Sand Pro 2040Z Page 4 - 19 Hydraulic System
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).
IMPORTANT: All obvious areas such as hydraulic
oil supply, oil filters, binding components, loose
fasteners or improper adjustments must be
checked before assuming that a hydraulic compo-
nent is the source of the problem.
CAUTION
Failure to use gauges with recommended pres-
sure (PSI/bar) rating as listed in test procedures
could result in damage to the gauge and possible
personal injury from leaking hot oil.
WARNING
Keep body and hands away from pin hole leaks or
nozzles that eject hydraulic fluid under h igh
pressure. Do not use hands to search for leaks;
use paper or cardboard. Hydraulic fluid escaping
under 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.
WARNING
Before disconnecting or p erforming any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
System Pressure in the General Information sec-
tion of this Chapter.
CAUTION
All testing should be performed by two (2)
people. One person should be in the seat to oper -
ate the machine, and the second person should
read test instruments and record test results.
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. System contamination c an cause
excessive wear or binding of hydraulic components.
2. Before testing, check all control linkages for improp-
er adjustment, binding or broken parts.
3. Review all hydraulic test steps before starting the
test procedure.
4. Put metal caps or plugs on a ny hydraulic lines left
open or exposed during testing or component removal.
5. 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.
6. Install hydraulic fittings finger tight and f ar enough to
make sure that they are not cross- threaded before tight-
eningthemwithawrench.
7. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
8. After connecting test equipment, check o il level in
the hydraulic reservoir to make sure that oil level is cor-
rect.
9. After installing test gauges, run engine at low idle
speed and check for any hydraulic oil leaks. Correct any
leaks before proceeding with test procedure.
10.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
11. When using hydraulic tester (pressure and flow),
open tester load valve completely before starting engine
to minimize the possibility of damaging components.
12.The engine must be in good operating condition
when conducting hydraulic tests. When performing a
hydraulic test, use a phototac to ensure engine speed is
correct. Engine speed can affect the accuracy of the tes-
ter readings.
Hydraulic
System
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