HYDRAULIC SYSTEM TMS800E SERVICE MANUAL
2-46
Published 01-29-2014, Control # 496-00
NOTE: The holding valve should turn by hand until
compression of the O-rings begins.
4. Carefully install the holding valve into the port block until
fully seated.
5. Remove the telescope hold valve tool.
6. Test the check valve and port block by operating the
telescope cylinder. Verify telescope cylinder works
without problems; verify there is no leaking. Make
repairs as needed.
Cartridge Style Holding Valve
Removal
Unscrew holding valve from its port block. (See Figure 2-32.)
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 holding valve.
3. 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.
4. Carefully install the holding valve into the port block until
fully seated.
5. Test the check valve and port block 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.
Manifold Style Holding Valve
Removal
1. Disconnect the tubing from the manifold.
2. Remove the screws and washers securing the holding
valve manifold.
Installation
1. Install the valve manifold and secure with the screws
and washers. Torque the screws refer to Fasteners and
Torque Values, page 1-13.
2. Connect the tubing to the valve.
CAUTION
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.
CAUTION
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.
DANGER
The cylinder must be fully retracted before removal.
FIGURE 2-32
Item Description
1 Cylinder Port
2Pilot
3Valve Port
1
2
3
2
3
1
6623-1
6623
Reference Only
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