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).
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.
Before Performing Hydraulic Tests
IMPORTANT: All obvious areas such as oil supply,
filter,bindinglinkages, loosefasteners, orimproper
adjustmentsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
3. Theenginemustbeingoodoperatingcondition.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.
Precautions for Hydraulic Testing
CAUTION
4.
The inlet and the outlet hoses must be properly con-
nected and not reversed (tester with pressure and flow
capabilities)topreventdamagetothehydraulictesteror
components.
Failure to use gauges with recommended pres-
sure (psi) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
5.
ties, open load valve completely in the hydraulic tester
to minimize the possibility of damaging components.
When using tester with pressure and flow capabili-
CAUTION
6.
sure that they are not cross--threaded before tightening
them with a wrench.
Install fittings finger tight and far enough to make
All testing should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine, and the other should read and
record test results.
7. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
8.
test equipment, make sure tank is full.
Check oillevelinthehydraulic tank.Afterconnecting
WARNING
9.
binding, or broken parts.
Check control linkages for improper adjustment,
Keepbodyandhandsawayfrompinholeleaks
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.
10.All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
11.
If a traction circuit problem exists, consider perform-
ing one or more of the following tests: Traction Circuit
Working Pressure, Charge Relief Valve Pressure, Pis-
ton Pump (P3) Flow & Traction Relief Pressure and/or
Wheel Motor Efficiency Tests.
12.If
a cutting circuit problem exists, consider perform-
ing one or more of the following tests: Cutting Deck Cir-
cuit Pressure, Manifold Relief Valve (R1) Pressure,
Logic (Counterbalance) Valve (LC1) Pressure, Gear
Pump (P1) Flow and/or Deck 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 will cause excessive
wear of components.
13.If
asteeringorliftcircuitproblemexists,considerper-
forming one or more of the following tests: Steering and
LiftRelief Pressure, Gear Pump (P2)Flow and/or Steer-
ing Control Valve Tests.
2.
open or exposed during testing or removal of compo-
nents.
Put metal caps or plugs on any hydraulic lines left
Hydraulic System (Rev. D)
Page 4 -- 28
Groundsmaster 3500--D
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