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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 111
NOTE: The deck control 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 t he plug head using a pin punch
and hammer before using anallen wrenchto remove the
plug: the impact will allow plug removal with less chance
of damage to the head of the plug.
For solenoid and control valve service procedures, see
Control Manifold Cartridge Valve Service in this section.
Refer to Figures 93 and 94 for cartridge valve and plug
installation torque.
IMPORTANT: A pilot piston (item 6) is placed be-
neath each of the relief valves in deck control man-
ifold ports RV8 and RV9. If a relief valve is removed
from the manifold, make sure to remove pilot piston
and label its position for assembly purposes. When
installing the pilot piston in the manifold, make sure
that the pilot piston slides fully into the port before
installing relief valve.
1. Manifold body
2. Zero leak plug (#4)
3. Zero leak plug (#6)
Figure 94
1
3
2
UP
25 ft--lb
(34 N--m)
20 ft--lb
(27 N--m)
Hydraulic
System