Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 109
NOTE: The ports on the combination manifold are
marked for easy identification of components. Example:
P4 is the gear pump connection port, S1 is the lift/lower
solenoid valve and SV10 is the engine cooling fan solen-
oid valve (see Hydraulic Schematic in Chapter 10 --
Foldout Drawings to identify the function of the hydraulic
lines and cartridge valves at each port).
WARNING
If combination manifold is attached to machine,
make sure that cutting units are fully lowered be -
fore loosening hydraulic lines or cartridge valves
from combination manifold. If cutting units are
raised as components are loosened in manifold,
cutting units may drop unexpectedly.
NOTE: The combination manifold uses several zero
leak plugs. These plugs have a tapered sealing surface
on the plug head that is designed to resist vibration in-
duced 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 using a punch and
hammer before using an allen wrench to remove the
plug: the impact will allow plug removal with less chance
of damage to the socket head of the plug.
Combination Manifold Service
For combination manifold cartridge valve service pro-
cedures, see Control Manifold Cartridge Valve Service
in this section. Refer to Figures 76, 77 and 78 for com-
bination manifold cartridge valve and plug installation
torque.
IMPORTANT: A flow control orifice is located be-
neath several plugs in the combination control man-
ifold. If an orifice is removed from a manifold port,
make sure to label its position for assembly pur-
poses. When installing the orifice in the manifold,
make sure that the orifice is properly tightened in
the port.
IMPORTANT: A flow control orifice is placed be-
neath hydraulic fittings in combination manifold
ports C2, C3 and C5. If any of these fittings is re-
moved from the manifold, make sure to remove ori-
fice and l abel its position for assembly purposes.
Also note location of groove in orifice for assembly
purposes. When installing the orifice in the man -
ifold, make sure that the orifice is flat in the base of
the port.
1. #4 zero leak plug
2. #6 zero leak plug
3. Orifice (0.040)
4. #4 zero leak plug
5. Orifice (0.063)
6. Check valve
7. Compensator valve
Figure 77
2
3
6
8
1
5
7
4
1
1
1
1
2
20 ft--lb
(27 N--m)
25 ft--lb
(34 N--m)
25 ft--lb
(34 N--m)
20 ft--lb
(27 N--m)
1. #6 hex head plug 2. #4 hex head plug
Figure 78
1
2
1
1
9to11ft--lb
(12to14N--m)
20 to 26 ft--lb
(27to35N--m)
Hydraulic
System
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