Hydraulic Control Manifold Service: Power Down and Traction Assist (GM 4500--D)
25
(33.9
ft--lb
N--m)
3
2
25
ft--lb
(33.9
N--m)
20
ft--lb
(27.1
N--m)
6
5
20
ft--lb
(27.1
N--m)
4
1
6
Figure 67
1.
2.
3.
Manifold body
Traction assist valve (RV2: port 2)
Counterbalance valve (RV1: port 4)
4.
5.
Expanding plug (not serviced)
Lift relief valve (RV7: port 7)
6.
Traction pressure sensing valve
(PD3: port 5)
NOTE: The ports on the manifold are marked for easy
identification of components. Example: CB is the con-
nection port from the lift/lower control valve and CHG is
the charge circuit connection (See Hydraulic Schemat-
ics to identify the function of the hydraulic lines and car-
tridge valves at each port).
For cartridge valve service procedures, see Hydraulic
Control Manifold Service: 2 Wheel/4 Wheel Drive Con-
trol in this section. Refer to Figure 67 for cartridge valve
installation torque.
Groundsmaster 4500--D/4700--D
Page 4 -- 75
Hydraulic System (Rev. A)
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