Manitowoc Grove RT880E User Manual

HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-60 Published 11-10-2014, Control # 524-00
OUTRIGGER CONTROL MANIFOLD
Description
The outrigger control manifold reduces the pressure
supplied to the front steer accessories manifold and
directionally controls the outrigger circuit. The valve is
mounted from the bottom of the frame rail in front of the oil
cooler.
The inlet of the manifold has a bolt on block that houses two
pressure reducing valves. One reduces the internal outrigger
pressure to 2000 psi (13,789 kPa) and the other reduces the
system pressure to 3000 psi (20,684 kPa) for an external
port feeding the front steer accessories manifold and the rear
steer/fan drive axle lockout manifold.
The outrigger control consists of four (two for extend and two
for retract), two position two-way solenoid control valves,
internally connected in parallel and two pilot operated check
valves with integral thermal relief valves set at 300 psi
(2068 kPa) for the retract circuit and 3000 psi (20,684 kPa)
for the extend circuit (see Figure 2-33). The manifold also
includes eight (four front and four rear) normally closed two
position two-way solenoid valves. When energized, the
solenoid shifts the spool to open allowing extension or
retraction of the outrigger cylinders.
Maintenance
Removal
1. Tag and disconnect the electrical connectors or manual
control levers.
2. Tag and disconnect the hydraulic lines to the solenoid
valves; cap all lines and openings.
3. Remove the bolts, flatwashers and spring lockwashers
securing the manifold to the bracket and remove the
manifold.
Inspection
Visually inspect the valves and hydraulic connections for any
evidence of leaks or other damage. Check security of the
electrical connections. Inspect the wiring for any evidence of
cracks or breaks.
Installation
1. Position the manifold on the mounting bracket and
secure with the bolts, flatwashers and spring
lockwashers. Torque bolts; refer to Fasteners and
Torque Values, page 1-15 for proper torque value.
2. Connect the electrical connectors to the solenoids as
marked during removal.
3. Connect the hydraulic lines to the valves as marked
during removal.
Functional Check
1. Start engine and run at medium speed.
2. Operate the outriggers and check for smooth operation
of the cylinder(s).
Item Description
1 To Front and Rear Axle
2 Port T - To Port T Of Park Brake Range Shift
Valve
Item Description
3 Port P - To Port P Of Park Brake Range Shift
Valve

Manitowoc Grove RT880E Specifications

General

Brand	Manitowoc
Model	Grove RT880E
Category	Construction Equipment
Language	English