Service Manual

Rev. A
Groundsmaster 4500- D/4700- DHydraulic System Page 4 - 92
Rear Traction Co ntrol Manifold Service
1. Rear traction manifold body
2. Relief valve (port RV)
3. Pressure reducing valve (port PR)
4. #4 zero leak plug with O- ring
5. #6 zero leak plug with O- ring
6. Check valve (port CV)
7. Orifice (0.050) (port OR1)
Figure 74
25 ft- lb
(34 N- m)
115 ft- lb
(156 N- m)
20 ft- lb
(27 N- m)
50 ft- lb
(67 N- m)
1
2
4
3
5
6
7
25 ft- lb
(34 N- m)
NOTE: The ports on the rear traction manifold are
marked for easy identification of components. Example:
P2 is a piston pump connection port and RV is the loca-
tion 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 rear traction 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 r emoval with less chance
of damage to the socket head of the plug.
For rear traction manifold cartridge valve service proce-
dures, see Control Manifold Cartridge Valve Service in
this section. Refer to Figure 74 for rear traction manifold
cartridge valve and plug installation torque.
IMPORTANT: A flow control orifice (item 7) is lo-
cated beneath the hydraulic fitting in rear traction
manifold port T/OR1. If the orifice is removed from
this manifold port, make sure to label its position for
assembly purposes. When i nstalling the orifice in
the manifold, make sure that the orifice is properly
tightened in the port.