Groundsmaster 4300--D Hydraulic SystemPage 4 -- 105
3. If lift cylinder for deck #4 or #5 is being removed, re-
moveflangenutandcarriagescrewthatsecurer--clamp
to lift cylinder (Fig. 95).
4. Label all hydraulic connections for assembly pur-
poses. Thoroughly clean hydraulic connections prior to
loosening hydraulic lines from lift cylinder.
CAUTION
Beforeopeninghydraulicsystem,operateallhy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
RelievingHydraulicSystemPressurein theGen-
eral Information section of this chapter.
5. Disconnect hydraulic hoses from fittings in lift cylin-
derthatistoberemoved.Allowhosestodrainintoasuit-
able container. Remove and discard O--rings.
6. Putcapsorplugsondisconnectedhosesandfittings
to prevent contamination.
7. Removeoneretainingring(item11)andthrustwash-
er(item 12)fromthe cylinderslidepin (item13).Pullpin
fromtheliftcylinderandliftarm.Locateandretrievesec-
ond thrust washer.
8. Remove flange head screw (item 3) and flat washer
(item 5) that retain lift cylinder to pivot shaft.
9. Remove lift cylinder from pivot shaft and frame.
10.If hydraulic fittings are to be removed from lift cylin-
der, mark fitting orientation to allow correct assembly.
Remove fittings from lift cylinder and discard O--rings.
Installation (Fig. 93)
1. Ifhydraulicfittingswereremovedfromliftcylinder,lu-
bricate new O--rings, position O--rings to fittings and
installfittingsintoliftcylinderports(seeHydraulicFitting
Installation in the General Information section of this
chapter).Makesurethatfittingsareorientatedcorrectly.
2. Positionliftcylindertotheframe.Theliftcylinderbar-
rel end should be attached to the machine frame.
3. Slide barrel end of lift cylinder onto pivot shaft. Se-
cure cylinder with flange head screw (item 3) and flat
washer (item 5). Torque screw from 67 to 83 ft--lb (91
to 112 N--m).
4. Alignliftcylinder toliftarmmountingholes.Slidecyl-
inderslidepin(item13)(withthrustwasher(item12)and
retainingring( item11)installedononeend)throughthe
lift cylinder and lift arm. Install second thrust washer on
pin and secure with retaining ring (item 11).
5. Remove caps and plugs from disconnected hoses
and fittings.
6. Coat new fitting O--rings lightly with clean hydraulic
oil, install new O--rings and connect hydraulic hoses to
fittings on lift cylinder. Tighten hose connections (see
Hydraulic Hose and Tube Installation in the General In-
formation section of this chapter).
7. If liftcylinder for deck #4or #5w as removed, secure
r--clamptoliftcylinderwithflangenutandcarriagescrew
(Fig. 95).
8. Checkoillevel inhydraulicreservoirandaddcorrect
oil if necessary.
9. Lubricate lift cylinder grease fittings.
10.Follow Hydraulic System Start--up procedures (see
Hydraulic System Start--up in this section).
1. Lift cylinder (#4 shown)
2. Carriage screw
3. R--clamp
4. Flange nut
Figure 95
1
2
3
4
Hydraulic
System
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