Manitowoc Grove TMS800E User Manual

2-43
TMS800E SERVICE MANUAL HYDRAULIC SYSTEM
2
GROVE
Published 01-29-2014, Control # 496-00
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
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.
DANGER
Do not remove check valve with load on cylinder.
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
2 Port P - Pilot
3Port V - Valve
FIGURE 2-28
2
3
1
6155
6155-2
Reference Only

Manitowoc Grove TMS800E Specifications

General

Brand	Manitowoc
Model	Grove TMS800E
Category	Construction Equipment
Language	English