Double Pilot Operated Check Valve; Description; Maintenance - Manitowoc Grove RT9130E-2 Service And Maintenance Manual

RT9130E-2 SERVICE MANUAL

DOUBLE PILOT OPERATED CHECK VALVE

Description

The double pilot operated (PO) check valve Figure 2-27 is
located on the outside of the left superstructure side plate
behind the cab. It is used to hold or lock the cab tilt cylinder in
place. Oil flow is directed from the "V" ports 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. Tag and disconnect the hydraulic lines from the valve.
Cap or plug all openings.
2. Remove the capscrews, flatwashers and lockwashers
securing the valve to the turntable and remove the valve.
C1
30 psi
V1
Hydraulic Schematic
Grove
C2
6101-2
V2
Published 11-22-2016, Control # 345-12
Repair
1. Install new O-rings onto the check valve.
2. Lubricate the check valve and O-rings with clean
hydraulic oil.
CAUTION
Before installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should be replaced.
3. Carefully install the check valve into the port block until
fully seated.
Installation
1. Install the valve to the turntable and secure with the
capscrews, flatwashers and lockwashers.
2. Test the check valve by operating the cab tilt cylinder.
Verify it extends and retracts without problems; verify
there is no leaking. Make repairs as needed.
V1
V2
6101-1
HYDRAULIC SYSTEM
C1
C2
FIGURE 2-27
2-47
2