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).
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. Contamination will cause exces-
sive wear of hydraulic components.
2.
exposed during testing or removal of components.
Put caps or plugs on any hydraulic lines left open or
CAUTION
3.
Theenginemustbeingoodoperatingcondition.Use
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.
a tachometer when making a hydraulic test. Engine
speed will affect the accuracy of the hydraulic test read-
ings.
4.
Topreventdamage totester orcomponents, theinlet
and the outlet hoses must be properly connected, and
not reversed (when using tester with pressure and flow
capabilities).
Before Performing Hydraulic Tests
All obvious areas such as oil supply, filter, binding link-
age, loose fasteners or improper adjustments must be
checked before assuming that ahydraulic component is
the source of the problem being experienced.
5.
nents, completely open load valve in hydraulic tester
(when using tester with pressure and flow capabilities).
To minimize the possibility of damaging compo-
Precautions For Hydraulic Testing
6.
Install fittings finger tight, far enough to insure that
they are not cross--threaded, before tightening with a
wrench.
WARNING
7.
Position the tester hoses so that rotating machine
parts will not make contact with them and result in hose
or tester damage.
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved by stopping the engine
and lowering or supporting the cutting deck or
other implement.
8.
Check and adjust the oil level in the reservoir (front
axle) after connecting hydraulic test equipment.
9.
binding or broken parts.
Check the control linkage for improper adjustment,
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.
10.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
11.
(front axle) and adjust ifnecessary.Also,make surethat
no leakage from hydraulic components exist.
After testing is completed, check oil level in reservoir
Groundsmaster 3280--D/3320
Page 5 -- 19
Hydraulic System
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