Cascade Viewmast II 30C Triple Installation Instructions Manual page 6

- OPERATIONAL INSPECTION AND ADJUSTMENTS -
CAUTION
The factory set adjustments may not be correct for your
truck. Check each of the following before using the mast
for the first
time.
-Bleed air from the cyhnder according to paragraph
1 below.
-The hoist cylinder must sequence as shown in para-
graph 2.
WARNING
-Inspect the chains and check chain tension. See
paragraph 4.
-Check hoist and carriage chains for proper adjust-
ment. See paragraph 5 and 6.
-Check crosshead rollers for proper adjustment. See
paragraph 3.
1. Bleeding the Cylinder
Before the mast is put in service, air must be bled from the
hoist cylinder according to the following procedures.
a.
Assemble the forks (or attachment) onto the mast carriage.
b.
Without a load on the forks, extend and retract the mast
through one complete cycle.
C. With the mast fully lowered, check the truck hydraulic
tank and top off if necessary.
d.
Extend and retract the mast completely at least four more
times. This action will force air in the system to the center
cavity under the bleed fitting. Quad Lift: Leave the mast in
the extended position 20-30 minutes prior to lowering and
bleeding.
e. Extend the carriage to about 10 inches off the ground.
f.
The Customer User Kit (661506) included with the mast,
includes a metal hex tube wrench (661507) and a length
of clear plastic hose (661922). Slide the plastic hose
through the hex tube wrench and onto the bleed fitting
located at the top of the cylinder crosshead. Put the other
end of the tube in a container to collect oil. See Figure 6.
k/ //
TO CONTAINER
,/'-
BLEED
, FITTING
Figure 6. Hoist Cylinder Bleed Kit
9. Open the bleed fitting no more than one turn with the hex
tube wrench. The weight of the carriage will force air and
hydraulic oil out of the cylinder through the bleed fitting.
h.
If the carriage reaches the bottom of Its travel before all the
air is bled, close the bleed fitting and repeat Steps e through g.
i. When the 011 stream no longer contarns arr bubbles, close
the bleed frttrng and torque to 25-27 ft.-lbs.
j. Top off the truck hydraultc tank with clean, fresh 011
k.
Extend and retract the mast completely. If the mast doesn't
operate smoothly or if it appears to be "spongy", repeat
Steps b through j. Quad Lrft: A slight amount of bounce is
normal.
2. Cylinder Sequencing
Never work on the hoist cylinder with a load on
the lift truck control handles.
Before putting the mast in service, operate the mast through a
few complete cycles and check for proper sequencing.
The hoist cylinder is comprised of three plungers: primary,
master, and slave. See Figure 7. When the mast is actuated
from the fully lowered position, the primary plunger should
extend from within the master plunger to the end of its
stroke. NOTE: The master plunger will raise approximately
%" then stop during initial primary movement. This is a
normal sequencing function of the cylinder. Then the
master and slave plungers should extend simultaneously to
the end of their strokes.
THE PRIMARY
PLUNGER
SHOULD EXTEND
FIRST, THEN THE
MASTER AND
SLAVE PLUNGERS
SHOULD EXTEND
SIMULTANEOUSLY
'I ;
A
E
PRIMARY
PLUNGER
-i
SLAVE
-PLUNGER
PRIMARY
- PLUNGER
- MASTER
PLUNGER
+ CYLINDER
SHELL
Figure 7. Seqwmco of Hoist Cylinder Plunger Extension
When the cylinder is lowered from the fully extended
position, the slave and master plungers should completely
lower simultaneously, then the primary plunger should
lower. (Depending upon mast lifting height, the plungers
may not completely retract into the cylinder shell.)
6