Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such as pressure gauges in the circuits during various
operational checks (see the Special Tools section in this
Chapter).
1. Clean machine thoroughly before disconnecting or
disassembling any hydraulic component. Always keep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination can cause excessive
wear or binding of hydraulic components.
NOTE: The Workman vehicle remote hydraulic system
is used to operate the Topdresser 1800. Therefore,
when troubleshooting a hydraulic problem on the Top-
dresser 1800, perform hydraulic tests on the Workman
vehicle.
2. Review all test steps before starting the test proce-
dure.
3.
Before testing, check all control linkages for improp-
er adjustment, binding or broken parts.
4.
oil at normal operating temperature.
All hydraulic tests should be made with the hydraulic
Before Performing Hydraulic Tests
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.
WARNING
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 of this chapter.
Precautions for Hydraulic Testing
CAUTION
5.
open or exposed during testing.
Put metal caps or plugs on any hydraulic lines left
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.
6.
make sure that they are not cross–threaded before tight-
ening them with a wrench.
Install hydraulic fittings finger tight and far enough to
CAUTION
7. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
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.
8. After connecting test equipment, check oil level in
the hydraulic tank to make sure that oil level is correct.
9.
When conducting tests on the hydraulic system,
wear eye protection.
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
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.
Topdresser 1800 & 2500
Page 3 – 19
Hydraulic System
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