2-58 Published 11-22-2016, Control # 345-12
HYDRAULIC SYSTEM RT9130E-2 SERVICE MANUAL
PILOT OPERATED CHECK VALVE
Description
A pilot operated (PO) check valve is located in each
outrigger stabilizer cylinder port block Figure 2-34. The
check valve functions as a holding valve for the stabilizer
cylinder. Oil flow is directed from the “V” port to the “C” ports,
while blocking flow in the opposite direction. Flow is reversed
from “C” to “V” when pressure pilot oil is applied to the
opposite side “V” port.
Maintenance
Removal
1. Unscrew the check valve from the stabilizer cylinder port
block.
Installation
1. Check the inside of the port block for any sharp edges or
burrs and remove as necessary with emery cloth.
2. Install new O-rings onto the check valve.
3. Lubricate the check valve and O-rings with clean
hydraulic oil.
NOTE: The check valve should turn by hand until
compression of the O-rings begins.
4. Carefully install the check valve into the port block until
fully seated.
5. Test the check valve and port block by operating the
affected outrigger’s stabilizer cylinder. Verify it extends
and retracts without problems; verify there is no leaking.
Make repairs as needed.
CAUTION
Possible Equipment Damage!
Do not damage the O-rings during installation of the
holding valve. If the holding valve turns freely then gets
hard to turn, then easy to turn, remove the holding valve
and check the O-rings. They have probably been
damaged by a sharp edge of a port.
6155
6155-1
Cylinder
Valve
Pilot
V
V
C
C
FIGURE 2-34
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