Manitowoc Grove RT9130E-2 Service And Maintenance Manual

Grove Published 11-22-2016, Control # 345-12 2-51
RT9130E-2 SERVICE MANUAL HYDRAULIC SYSTEM
2
HOLDING VALVES
Description
A bolt-on manifold style holding valve is installed on the
boom lift cylinder and a cartridge style holding valve is used
on each telescope cylinder installed in the piston side of the
cylinder. The counterweight removal cylinders have two
cartridge style holding valves installed in both the piston and
rod.
The holding valve installed on the outlet of the cylinder
provides meter out control, will lock the cylinder in place,
prevents a load from running ahead of the oil supply, and
relieves excess pressure caused by thermal expansion.
Maintenance
Removal
1. Unscrew holding valve from its port block or manifold.
Repair
1. Check the inside of the port block or manifold for any
sharp edges or burrs and remove as necessary with
emery cloth.
2. Install new O-rings onto the holding valve.
Installation
1. Lubricate the holding valve and O-rings with clean
hydraulic oil.
NOTE: The holding valve should turn by hand until
compression of the O-rings begins.
2. Carefully install the holding valve into the port block or
manifold until fully seated.
3. Test the holding valve and port block or manifold by
operating the lift cylinder and/or the telescope cylinder,
as applicable. Verify lift cylinder and/or telescope
cylinder works without problems; verify there is no
leaking. Make repairs as needed.
Lower Lift Cylinder Holding Valve
Removal
1. Lower the boom to below horizontal.
2. Extend the boom to align the access holes in second
and third boom sections.
3. Install the telescope hold valve tool, P/N 80041761, see
Figure 2-30. While holding the tool in position have a
helper retract section 3 to lock the tool into place.
DANGER
Crushing Hazard!
Boom must be fully lowered and fully retracted before
removing lift cylinder and telescope cylinder holding
valves. The counterweight must be removed or pinned
before removing counterweight removal cylinder holding
valves.
CAUTION
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.
WARNING
Pinch Point Hazard!
Before accessing the holding valve install the telescope
hold valve tool to prevent section 3 from retracting into
section 2 when the holding valve is removed. Serious
injury may result.
WARNING
Flying Object Hazard!
The holding valve can fly with explosive force if the
hydraulic pressure is not relieved. Serious injury may
result.
FIGURE 2-30

Manitowoc Grove RT9130E-2 Specifications

General

Brand	Manitowoc
Model	Grove RT9130E-2
Category	Construction Equipment
Language	English