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TMS800E SERVICE MANUAL
NEEDLE VALVE (OPTIONAL)
Description
The two lift cylinder mounted needle valves (1, Figure 2-37)
are used to connect the rod and piston sides of the boom lift
cylinder together to allow the boom to float when the boom is
in the trailing boom mode.
The knob adjustable needle valve is installed into a manifold.
Turning the knob counterclockwise opens the valve to allow
the boom flotation and clockwise rotation closes the valve to
return to normal boom lift cylinder operation.
Maintenance
Removal
1.
Tag and disconnect the hydraulic lines from the valve
and cap or plug all openings and remove valve.
Installation
1.
Connect the hydraulic lines as tagged during removal.
NEEDLE VALVE WITH REVERSE FREE
FLOW CHECK (OPTIONAL)
Description
A needle valve (2, Figure 2-37) with a reverse free flow
check is used to prevent pressurization of the lift cylinder
when the boom lift cylinder is in the trailing boom mode.
The knob adjustable needle valve and check valve is
installed into a manifold. Turning the knob counterclockwise
GROVE
opens the valve to allow the normal boom lift operation and
clockwise rotation closes the valve for trailing boom mode.
Maintenance
Removal
1.
Tag and disconnect the hydraulic lines from the valve
and cap or plug all openings and remove valve.
Installation
1.
Connect the hydraulic lines as tagged during removal.
Published 01-29-2014, Control # 496-00
HYDRAULIC SYSTEM
1
2
FIGURE 2-37
2
2-53
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