Service Manual User guide

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
5-81
Fig. 5-50: Mid-Inlet Control Valve Components
(Ref. Fig. 5-49 and Fig. 5-50) The mid-inlet control valve is located on the
valve plate, near the middle of the machine. This valve controls hydraulic
functions for the following circuits:
• L.H. Outrigger
• R.H. Outrigger
• Carriage Fork Tilt
• Transfer Carriage
• 1st Auxiliary Hydraulics
• 2nd Auxiliary Hydraulics
• Frame Tilt
• Unloader (Used on 6K and 644B models with natural engines)
To the right of the mid-inlet section, there are two boom-controlling
sections for the following circuits:
• Boom Hoist
• Boom Extension (Telescope)
The presence of these circuits, and the controlling valve sections, depends
upon the machine model and installed options (see Fig. 5-51 and
Fig. 5-52).
K1141
Mid-Inlet
Outlet Section
Boom Extension
Boom Hoist
Relief Valve
“Pump 2”
Test Por t
Relief Valve
Inlet (From Priority
Valve on Pump)
Outlet
(Return to Tank)
Work Ports
Inlet Section
Inlet From
Pump 2
Valve Sections