2.
flange head screws but do not fully tighten.
Position lift control manifold to frame. Install two (2)
WARNING
3.
Remove caps and plugs from disconnected lines
and fittings.
Make sure that cutting decks are fully lowered
before loosening hydraulic lines, cartridge
valves or plugs from lift control manifold. If
decks are not fully lowered as manifold compo-
nents are loosened, decks may drop unexpect-
edly.
4.
Lubricate and install new O--ring(s) on manifold fit-
tings. Connect hydraulic lines to hydraulic manifold fit-
tingsandproperlytightenallconnections(seeHydraulic
Hose and Tube Installation in the General Information
section of this chapter).
5.
Disconnect hydraulic hoses and lines from fittings in
manifold. Allow lines to drain into a suitable container.
Remove and discard O--rings.
5.
(2)
Secure hydraulic manifold to frame by tightening two
flange head screws.
6.
manifold using labels placed during removal.
Connect wire harness leads to solenoid coils on
6.
to prevent contamination.
Put caps or plugs on disconnected lines and fittings
7.
oil if necessary.
Check oil level in hydraulic reservoir and add correct
7.
sembly purposes. Unplug wire harness leads from sole-
noid coils on manifold.
Label all solenoid coil wire harness leads for as-
8. Follow Hydraulic System Start--up procedures (see
Hydraulic System Start--up in this section).
8.
Remove two (2) flange head screws that secure
manifold to machine frame.
2
(27
0 ft--lb
N--m)
50 ft--lb
(68 N--m)
9.
Remove lift control manifold from machine.
4
10
IMPORTANT: A flow control orifice is placed be-
neath several hydraulic fittings on the lift control
manifold (Fig. 91). The lift manifold uses two (2) dif-
ferentorificesizes.Iffittingsareremovedfromman-
ifoldandanorificeisinthemanifoldport,makesure
to remove orifice and label its position for assembly
purposes.
9
4
2
2
3
5
12
6
10.If
(Fig. 91). Discard any removed O--rings. Locate, re-
trieve and label orifice from manifold port (if equipped).
necessary, remove hydraulic fittings from manifold
11
9
1
Installation (Fig. 90)
6
3
20
(27 N--m)
ft--lb
8
7
1.
If fittings were removed from manifold (Fig. 91):
Figure 91
A. Lubricate new O--rings with clean hydraulic oil.
Install lubricated O--rings on fittings.
1.
2.
3.
4.
5.
6.
Lift control manifold
Straight fitting (2 used)
O--ring
7.
8.
9.
Straight fitting (6 used)
O--ring
O--ring
IMPORTANT: Wheninstallingorificeinmanifold,
make sure that orifice is flat in the base of the fit-
ting cavity. Manifold damage is possible if the
orifice is cocked in the cavity.
O--ring
10. Straight fitting
11. 45
12. O--ring
Orifice (0.030)
Orifice (0.046) (3 used)
o fitting
B. For manifold ports with orifice, place correct ori-
fice in port with the orifice slot facing out.
C. Install fittings into manifold. Torque fittings to
torque values identified in Figure 91.
Groundsmaster 4300--D
Page 4 -- 101
Hydraulic System
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