Grove Published 11-10-2014, Control # 524-00 2-67
RT880E SERVICE MANUAL HYDRAULIC SYSTEM
CHECK VALVES
Description
There are two check valves utilized in the crane hydraulic
system. The check valves are used to block flow in one
direction and allow free flow in the opposite direction.
The crane’s hydraulic dual return circuit has an in-line check
valve plumbed in one of the two return lines. It is used to
force hot return oil through the second return line and into the
oil cooler.
The second check valve is plumbed in-line at the inlet of the
front steer control valve. It prevents steering wheel kick-back
if the steer cylinder pressure rises above the inlet port
pressure.
Maintenance
Removal
1. Tag and disconnect hydraulic lines from the valve and
cap or plug all openings and remove valve.
Installation
1. Connect the hydraulic lines as tagged during removal.
2. Check valve and hydraulic connections for leaks. Make
repairs as needed.
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