user manual

Groundsmaster 4100--D Hydraulic SystemPage 4 -- 31
Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
suchaspressure gaugesandflow metersinthe 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
adjustmentsmustbecheckedbeforeassumingthat
ahydrauliccomponentisthesourceoftheproblem.
Precautions for Hydraulic Testing
CAUTION
Failure to use gauges with recommended pres-
sure (PSI) rating as listed in test procedures
couldresultindamagetothegaugeandpossible
personal injury from leaking hot oil.
CAUTION
All t esting should be performed by two (2)
people.Onepersonshouldbeintheseattooper-
ate the machine and the other should read and
record test results.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignitionswitchinOFF.Removekeyfrom theigni-
tion switch.
WARNING
Keepbodyandhandsawayfrompinholeleaks
ornozzles that ejecthydraulic fluid underhigh
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.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved and all rotating ma-
chine parts must be stopped. Stop engine;
lower or support attachments.
1. Clean machine thoroughly before disconnecting or
disassemblinganyhydrauliccomponents.Alwayskeep
in mind the need for cleanliness when working on hy-
draulic equipment. Contamination will cause excessive
wear of hydraulic components.
2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of compo-
nents.
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.
4. Theinletandtheoutlethosesfortesterwithpressure
and flow capabilities must be properly connected and
not reversed to prevent damage to the hydraulic tester
or components.
5. When using hydraulic tester with pressure and flow
capabilities, open load valve completely in the tester to
minimize the possibility of damaging components.
6. Install fittings finger tight and far enough to make
sure thatthey are notcross--threaded before tightening
them with a wrench.
7. Position tester hoses to prevent rotating machine
partsfromcontactinganddamagingthehosesortester.
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.Allhydraulictestsshouldbe madewith thehydraulic
oil at normal operating temperature.
12.Before returningmachine touse, makesure thathy-
draulic reservoir has correct fluid level. Also, check for
hydraulic leaks after test equipmenthas been removed
from hydraulic system.
Hydraulic
System