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).
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 Performing Hydraulic Tests
WARNING
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 hydraulic system problem.
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
Precautions for Hydraulic Testing
5.
open or exposed during testing or component removal.
Put metal caps or plugs on any hydraulic lines left
CAUTION
6.
When using hydraulic tester (pressure and flow), the
Failure to use gauges with expected pressure
(psi) rating as listed in test procedures could re-
sult in damage to the gauge and possible person-
al injury from leaking hot oil.
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.
CAUTION
8.
parts from contacting and damaging the hoses or tester.
Position tester hoses to prevent rotating machine
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.
9.
the hydraulic tank to make sure that oil level is correct.
After connecting test equipment, check oil level in
10.When
using hydraulic tester (pressure and flow),
WARNING
open tester load valve completely before starting engine
to minimize the possibility of damaging components.
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
escaping under pressure can have sufficient
force to penetrate the skin and cause serious
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.
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.If a traction circuit problem exists, consider perform-
ing one or more of the following tests: Charge Relief
Valve (R2) Pressure, Traction Relief Valve (R3) Pres-
sure, Traction Pump (P1) Flow, Charge Pump (P2) Flow
and/or Wheel Motor Efficiency Tests.
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.
13.If a lift or steering (Sand Pro 5040 and Infield Pro
5040) circuit problem exists, consider performing one or
more of the following tests: Implement Relief Valve (R1)
Pressure, Charge Pump (P2) Flow and/or Steering Cyl-
inder Internal Leakage Tests.
2.
Review all test steps before starting the test proce-
dure.
Sand Pro & Infield Pro 3040/5040
Page 4 – 21
Hydraulic System
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