HYDRAULIC SYSTEM RT770E
2-30
Published 11/26/2014, Control # 447-05
VALVES
General
This subsection provides descriptive information for several
of the main hydraulic valves used on this crane. For a listing
of the valves, the circuit they are used in, and their physical
location, refer to Table 2-3. Refer to Figure 2-16 and
Figure 2-17 for valve locations.
The description of each valve given here is for the valve
itself. For information on how each valve functions in the
individual circuits, refer to the description and operation
procedures of that circuit.
Table 2-3
Valve Usage Table
Valve Name Circuit Used In Physical Location
Superstructure
Directional Control Valves Hoist/Lift /Telescope
Swing/Steer
Counterweight Removal (Optional)
Superstructure (Right Side)
Superstructure (Right Side)
Rear Turntable
Hydraulic Remote Controllers
(Joysticks)
Hoist/Lift
Swing/Telescope
Right Armrest
Left Armrest
Dual Accumulator Charge Valve Service Brakes Superstructure (inside left side)
Swing Brake/Armrest Lockout Manifold
• Swing Brake Release
• Crane Function
Swing
Each hoist, swing, lift and telescope
controller circuit
Superstructure (right side)
Superstructure (right side)
Holding Valves Lift
Telescope
Lift cylinder (bolt on)
Telescope cylinder port blocks
Carrier
Integrated Outrigger/Rear Steer Valve Outrigger and Rear Steer On front face of carrier frame front
cross member
Outrigger Control Manifold Outrigger Front and Rear Outrigger Boxes
Axle Lockout Valve (Double Solenoid
Valve)
Rear Axle Lockout On carrier left side rear center frame
cross member
High Speed Boost Selector Valve Hoist and Telescope On swivel port #6
Priority Flow Control Valves Fan Motor On carrier, RH fan structure
Cross Axle Differential Lock Solenoid
Valve
Optional axle differential lock On carrier front side rear center frame
cross member
Axle Disconnect Solenoid Valve Two/Four Wheel Drive On carrier left side rear center frame
cross member
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