Pilot Operated Check Valve; Description; Maintenance - Manitowoc Grove TMS800E Service And Maintenance Manual

TMS800E SERVICE MANUAL

PILOT OPERATED CHECK VALVE

Description

A pilot operated (PO) check valve (see Figure 2-28) is
located in each outrigger stabilizer cylinder port block. 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
Do not remove check valve with load on cylinder.
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.
Item

Description

1 Port C - Cylinder
2 Port P - Pilot
3 Port V - Valve
GROVE
DANGER
6155-2
Published 01-29-2014, Control # 496-00
3. Lubricate the check valve and O-rings with clean
hydraulic oil.
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.
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.
1
2
3
HYDRAULIC SYSTEM
6155
FIGURE 2-28
2-43
2