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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 125
Removal (Fig. 103)
NOTE: The ports on the lift circuit junction manifoldare
marked for easy identification of components (e.g. P1 is
the gear pump connection port). See Hydraulic Sche-
matics in Chapter 9 -- Foldout Drawings to identify the
function of the hydraulic lines at each port.
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. Toprevent contamination ofhydraulic system during
manifold removal,thoroughly cleanexterior ofmanifold.
WARNING
Make sure that cutting decks are fully lowered
before loosening hydraulic lines from lift circuit
junction manifold. If decks are raised as hydrau-
lic linesare loosened,decks maydrop unexpect-
edly.
4. Disconnect hydraulic lines from manifold and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper assembly.
5. Remove hydraulic manifold from the frame using
Figure 103 as guide.
IMPORTANT: A flow control orifice is placed be-
neath several of the hydraulic fittings on the lift cir-
cuit junction manifold (Fig. 104). The manifold uses
two (2) different orifice sizes. If a fitting is removed
from thelift junctionmanifold andan orifice isin the
manifoldport, makesureto removeorifice andlabel
its position for assembly purposes. Also note loca-
tion of groove in orifice for assembly purposes.
6. If necessary, remove fittings from manifold and dis-
card O--rings (Fig. 104).
Installation (Fig. 103)
IMPORTANT: When installing orifice in manifold,
make sure that orifice is flat in the base of the man-
ifold port. Manifold damage is possible if the orifice
is cocked in the cavity.
1. Iffittings were removedfrom junction manifold,lubri-
cate and place new O--rings onto fittings. Install fittings
into manifold openings making sure that orifice is cor-
rectlyplacedbeforethreadingfittingintomanifold.Tight-
en fittings (see Hydraulic Fitting Installation in the
General Information section of this chapter). Refer to
Figure 104 for fitting installation torque.
2. Install hydraulic manifold to the frame using Figure
103 as guide.
3. Remove caps and plugs from fittings and hoses.
Properly connect hydraulic lines to manifold (see Hy-
draulic Hose and Tube Installation in the General Infor-
mation section of this chapter).
1. Manifold body
2. Orifice (0.055)
3. Orifice (0.030)
4. Straight fitting (3 used)
5. Zero leak plug
Figure 104
25 ft--lb
(33.9 N--m)
4
3
2
1
5
UP
20 ft--lb
(27.1 N--m)
3
Hydraulic
System