Grove Published 11-22-2016, Control # 345-12 2-59
RT9130E-2 SERVICE MANUAL HYDRAULIC SYSTEM
PRESSURE BLEED-OFF VALVE
Description
The pressure bleed-off valve(Figure 2-35) is used to
manually drain to reservoir any trapped pressure from
behind the outrigger box removal quick disconnects or the
telescope boom removal quick disconnects.
The in-line plumbed pressure bleed-off valve consists of a
knob adjustable flow control valve and a shuttle valve. The
adjustable flow control valve knob can be turned
counterclockwise to open or clockwise to close. Full
adjustment is five turns of the knob. The shuttle valve acts as
a directional selector, allowing only the pressurized circuit to
open to the flow control drain valve.
Whenever possible, the bleed adapter should be mounted at
the highest point within the hydraulic system. The trapped
air can be relieved while the system is running at low
pressure. To bleed, loosen the bleed screw 1/2 turn
counterclockwise. After the hydraulic fluid begins to run
freely from the bleed screw, the bleed screw should be re-
tightened.
NOTE: Pressure bleed-off valve must be opened to bleed
off pressure before quick couplers are
disconnected.
Maintenance
Removal
1. Tag and disconnect hydraulic lines from valve. Cap or
plug all openings and remove valve.
2. Remove the capscrews and washers securing the valve.
Remove the valve.
Installation
1. Connect the hydraulic lines as tagged during removal.
2. Connect the hydraulic lines to the valve as tagged during
removal.
WARNING
When bleeding hydraulic fluid, operate the system below
500 psi. To avoid injury, ensure that all persons are clear
of the path of discharge. Another recommended practice
is to attach a section of hose over the bleed screw/
adapter to direct oil away from the area and to reduce oil
spillage.
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