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Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 36
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).
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners or improper
adjustmentsmustbecheckedbefore assuming that
a hydraulic component isthe sourceof theproblem.
Precautions for Hydraulic Testing
CAUTION
Failure to use gauges with recommended pres-
sure (PSI/bar) rating as listed in test procedures
could result in damageto thegauge and possible
personal injury from leaking hot oil.
WARNING
Keep body and hands awayfrom pin hole leaksor
nozzles that eject hydraulic fluidunder high pres-
sure. Do not use hands to search for leaks; use
paper or cardboard. Hydraulic fluid escaping un-
der 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 performing any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
SystemPressureintheGeneralInformationsec-
tion in this chapter.
CAUTION
All testing should be performed by two (2)
people. One personshould bein the seat tooper-
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. Contamination will cause excessive
wear of components.
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
3. 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 flow
testing.
4. When using the hydraulic tester with flow and pres-
sure capabilities, the inlet and the outlet hoses must be
properly connected and not reversed to prevent dam-
age to the hydraulic tester or components.
5. When using the hydraulic tester with flow and pres-
sure capabilities, completely open flow control valve on
tester before starting the engine to minimize the possi-
bility of damaging components.
6. Install fittings finger tight and far enough to make
sure that they are not cross--threaded before tightening
them with a wrench.
7. Position tester hoses to prevent rotating machine
parts from contacting anddamaging thehoses or tester.
8. Check oil level in the hydraulic reservoir. After con-
necting test equipment, make sure tank is full.
9. Check control linkages for improper adjustment,
binding or broken parts.
10.After installing test gauges, run engine at low speed
and check for any hydraulic oil leaks.
11.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
12.Before returning machine to use, make sure that hy-
draulic reservoir has correct fluid level.