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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 143
Removal (Fig. 121)
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
3. To prevent contamination of hydraulic system during
lift cylinder removal, thoroughly clean exterior of lift cyl-
inder.
WARNING
Make sure that cutting decks are fully lowered
before loosening hydraulic lines from lift cylin-
der. If decks are raised as hydraulic lines are
loosened, decks may drop unexpectedly.
4. Disconnect hydraulic hoses from lift cylinder. Put
caps or plugs on open hydraulic hoses and fittings to
prevent system contamination. Label the hydraulic
hoses toshow their correct position onthe liftcylinder for
assembly purposes.
5. Remove flange head screw and flange nut that se-
cure the cylinder pin (item 3) to the lift arm. Remove pin
from lift arm and cylinder shaft clevis.
6. Remove one (1) retaining ring from the cylinder pin
(item 6). Remove cylinder pin from the frame and cylin-
der barrel clevis.
7. Remove lift cylinder from machine.
8. If hydraulic fittings are to be removed from lift cylin-
der, mark fitting orientation to allow correct assembly.
Remove fittings from cylinder and discard O--rings.
NOTE: For lift cylinder disassembly and assembly pro-
cedures, see Lift Cylinder Service in this section.
Installation (Fig. 121)
1. If fittings were removed from lift cylinder, lubricate
and place new O--rings onto fittings. Install fittings into
cylinder openings usingmarks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Infor-
mation section of t his chapter).
2. Position cylinder barrel clevis to frame and insert cyl-
inder pin (item 6) with one (1) retaining ring installed
through the frame and cylinder clevis. Secure pin with
second retaining ring.
3. Insert cylinder pin (item 3) through the lift arm and
cylinder shaft clevis. Secure pin to lift arm with flange
head screw and flange nut.
4. Remove caps and p lugs from hydraulic hoses and
fittings. Attach hoses to lift cylinder (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
5. Fill reservoir with hydraulic fluid as required.
6. Lubricate lift cylinder grease fittings.
7. After assembly is completed, operate lift cylinder to
verify that lift cylinder, hydraulic hoses and fittings do not
contact any machine components during operation.
Figure 122
#4 Deck #1 Deck #5 Deck
#7 Deck
(GM4700)
#6 Deck
(GM4700)
#3
Deck
#2
Deck
CUTTING DECK LOCATIONS
Hydraulic
System