Operation Manual
73
Preventive Maintenance
Boom Emergency Lower Down Valve
Both of the lift and extend cylinders are equipped with a
needle valve which allows the cylinder to retract without the
direct assist of the machine’s hydraulic power. This feature is
intended to be used only in the event of total loss of engine or
hydraulic pump failure with an elevated boom.
In any event, the forklift should be secured until the situation
has been properly evaluated. Secure the forklift and area by
following the procedures below:
1.
Clear the area around the forklift of all personnel.
2.
Place the sift lever in NEUTRAL and engage the parking
brake switch to the ON position.
3.
Section off a large area under the boom with tape to restrict
any personnel from entering this potentially dangerous area.
4.
If the load is in a position where it can be removed safely,
completely remove the load from the carriage and/or
attachment. Otherwise leave the load in place.
5.
Remove boom access cover on back of boom.
6.
Locate needle valve on extend cylinder. Loosen nut on
valve, then loosen valve with hex wrench.
7.
Fully retract boom with control handle in cab.
8.
When boom is fully retracted, tighten valve with hex
wrench, then tighten nut to secure valve.
9.
Locate needle valves on lift cylinders. Loosen nut on valve,
then loosen valve with hex wrench (repeat for both sides).
10.
Fully lower boom with control handle in cab.
11.
When boom is fully lowered, tighten valve with hex
wrench, then tighten nut to secure valve (repeat for both
sides).
Figure 94. Boom Access Cover
Figure 95. Extend Cylinder Lower Down Valve
Figure 96. Lift Cylinder Lower Down Valve
