HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-44 Published 4-20-2015, Control # 502-01
PILOT OPERATED CHECK VALVE
Description
A pilot operated (PO) check valve is located in each
outrigger jack cylinder port block. The check valve functions
as a holding valve for the jack 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
(Figure 2-23)
Maintenance
Removal
1. Unscrew the check valve from the jack 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 jack cylinder. Verify it extends and
retracts without problems; verify there is no leaking.
Make repairs as needed.
CAUTION
Do not damage the O-rings during installation of the check
valve. If the check valve turns freely then gets hard to turn,
then easy to turn, remove the check valve and check the
O-rings. They have probably been damaged by a sharp
edge of a port.
Item Description
1 Port C - Cylinder
2Port P - Pilot
3Port V - Valve
FIGURE 2-23
2
3
1
6155
6155-2
1
2
3
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