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Hydraulic Hoses
Hydraulic hoses are subject to extreme conditions such
as, pressure differentials during operation and exposure
to weather, sun, chemicals, very warm storage condi-
tions or mishandling during operation or maintenance.
These conditions can cause damage or premature dete-
rioration. Some hoses are more susceptible to these
conditions than others. Inspect the hoses frequently for
signs of deterioration or damage.
When replacing a hydraulic hose, be sure that the hose
is straight (not twisted) before tightening the fittings.
This can be done by observing the imprint on the hose.
Use two wrenches; one to hold the hose straight and one
to tighten the hose swivel nut onto the fitting.
Hydraulic Fitting Installation
O–Ring Face Seal
1. Make sure both threads and sealing surfaces are free
of burrs, nicks, scratches, or any foreign material.
2. Make sure the O–ring is installed and properly seated
in the groove. It is recommended that the O–ring be re-
placed any time the connection is opened.
3. Lubricate the O–ring with a light coating of oil.
4. Put the tube and nut squarely into position on the face
seal end of the fitting and tighten the nut until finger tight.
5. Mark the nut and fitting body. Hold the body with a
wrench. Use another wrench to tighten the nut to the cor-
rect flats from finger tight (F.F.F.T.). The markings on the
nut and fitting body will verify that the connection has
Before disconnecting or performing any work
on hydraulic system, all pressure in system
must be relieved by stopping the engine and
lowering or supporting the box and/or other
attachment.
Keep body and hands away from pin hole
leaks or nozzles that eject hydraulic fluid un-
der high pressure. Use paper or cardboard,
not hands, to search for leaks. Hydraulic fluid
escaping under pressure can have sufficient
force to penetrate the skin and do serious
damage. If fluid is injected into the skin, it
must be surgically removed within a few
hours by a doctor familiar with this type of in-
jury or gangrene may result.
WARNING
Nut
Sleeve
Seal
Body
Figure 2
been tightened.
Size
4 (1/4 in. nominal hose or tubing)
6 (3/8 in.)
8 (1/2 in.)
10 (5/8 in.)
12 (3/4 in.)
16 (1 in.)
F.F.F.T.
.75 + .25
.75 +
.25
.75 +
.25
1.00 +
.25
.75 +
.25
.75 +
.25
and Body
Final
Position
Extend Line
Initial
Position
Mark Nut
Finger Tight After Proper Tightening
Figure 3
Hydraulic System
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Groundsmaster 3000/3000–D