4WD Control Manifold Service
3
20 ft--lb
(27 N--m)
50
(67
ft--lb
N--m)
20
(27
ft--lb
N--m)
2
2
0 ft--lb
4
(27
N--m)
1
5 ft--lb
(6.7 N--m)
UP
5
6
2
5 ft--lb
UP
(33
N--m)
7
35
(47
ft--lb
N--m)
75
(101
ft--lb
N--m)
12
3
0 ft--lb
13
4
(40
N--m)
8
9
14
20
(27
ft--lb
N--m)
2
50
(67
ft--lb
N--m)
20
(27
ft--lb
N--m)
11
9
20
(27
ft--lb
N--m)
50
(67
ft--lb
N--m)
10
Figure 66
1.
2.
3.
4.
5.
Orifice (0.040) (OR2)
Plug with O--ring
NWD #6 plug with O--ring
NWD #8 plug with O--ring
Solenoid valve (SV)
6.
Solenoid coil
Nut
11. Orifice (0.030) (OR1)
12. Relief valve (RV)
13. Pressure valve (PR)
14. Directional pilot valve (PD1)
7.
8.
9.
Check valve (CV)
NWD #4 plug with O--ring
10. Directional pilot valve (PD2)
NOTE: The ports on the 4WD control manifold are
marked for easy identification ofcomponents. Example:
P1 is the pump supply port for the forward direction and
RV is the location for the relief valve (see Hydraulic
Schematic in Chapter 10 -- Foldout Drawings to identify
the function of the hydraulic lines and cartridge valves
at each port).
NOTE: The 4WD control manifold includes several
zero leak NWD plugs. These plugs have a tapered seal-
ing surface on the plug head that is designed to resist
vibration induced plug loosening. The zero leak plugs
also have an O--ring as a secondary seal. If zero leak
plug removal is necessary, lightly rap the plug head us-
ing a punch and hammer before using an allen wrench
toremovetheplug:theimpactwillallowplugremovalwi-
th less chance ofdamage to the socket head of the plug.
Wheninstallingplugs,refertoFigure66forpluginstalla-
tion torque.
Valve Cartridge Service (Fig. 66)
For solenoid and control valve service procedures, see
Hydraulic Traction Control Manifold Service in this sec-
tion. Refer to Figure 66 for 4WD control manifold car-
tridge valve and plug installation torque.
IMPORTANT: An orifice is placed beneath the plugs
in the control manifold OR1 and OR2 ports. If one of
theseplugsisremoved,makesuretoremoveorifice
and label its position for assembly purposes.
Hydraulic System
Page 4 -- 92
Groundsmaster 5900/5910
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