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 Special Tools
section in this Chapter.)
3. The engine must be in good operating condition. Use
a tachometer when making a hydraulic test. Engine
speed will affect the accuracy of the tester readings.
4.
Because the hydraulic pump is belt driven, check for
proper pump belt adjustment before performing any hy-
draulic test.
CAUTION
5.
To prevent damage to tester or components, the inlet
and the outlet hoses must be properly connected, and
not reversed (when using tester with pressure and flow
capabilities).
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
could result in damage to gauge and possible
personal injury from leaking hot oil.
6. To minimize the possibility of damaging components,
completely open load valve in hydraulic tester (when us-
ing tester with pressure and flow capabilities).
Before Performing Hydraulic Tests
7.
they are not cross–threaded, before tightening the fit-
tings with a wrench.
Install fittings finger tight, far enough to insure that
All obvious areas such as oil supply, filter, binding link-
age, loose fasteners, or improper adjustments must be
checked before assuming that a hydraulic component is
the source of the problem being experienced.
8.
Position the tester hoses so that rotating vehicle
parts will not make contact with them and result in hose
or tester damage.
Precautions For Hydraulic Testing
9.
connecting hydraulic test equipment.
Check and adjust the oil level in the transaxle after
WARNING
10.All
oil at normal operating temperature.
hydraulic tests should be made with the hydraulic
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved by stopping the engine,
rotating the steering wheel in both directions,
lowering or supporting the bed and operating
other hydraulic accessories.
11.
After testing is completed, check and adjust the oil
level in the transaxle before returning the vehicle to ser-
vice.
Keep body and hands away from pin hole leaks
or nozzles that eject hydraulic fluid under 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 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. Gangrene may result from such
an injury.
1.
Thoroughly clean the vehicle 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 caps or plugs on any hydraulic lines left open or
exposed during testing or removal of components.
Workman 3000/4000 Series
Page 9 – 15
Hydraulic System
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