Cascade Viewmast M2T Installation And Service Manual page 6

Page 6
A.
B.
C.
M2T, M3T, M4T. M5T, M7T and MST mounted
with three inch underclearance. The bottom edge
of the lower bar on the mast carriage should be
even with the bottom side of the mast channels.
M2T, M3T. M4T and M5T mounted with five inches
underclearance.
The carriage should be two
inches below the bottom side of the mast channels.
M7T and MST mounted with six inches underclear-
ante. carriage
should be three inches below
bottom side of the mast channels.
NOTE:
To obtain above dimensions, adjustment is
as follows: (1) Loosen the two jam nuts on the upper
side of the chain anchor rod, and (2) tighten or loosen
adjustment nuts located on theend of the,chain anchor
rod to accomplish dimensions as listed above. After
adjustment is completed, tighten the jam nuts securely.
PLUG ADJUSTMENT
Adjustable wear surfaces have been provided to compen-
sate for normal mast wear. Properly adjusted channel
members will fit snugly but also should be free to raise
and lower without binding.
If adjustment is required, it is important that all plugs be
tightened evenly.
NOTE:
After the side plugs have been adjusted, each
channel assembly should be centered within its mating
channel.
LATCH ADJUSTMENT
The Cascade Viewmast has incorporated in its design two
pairs of latches. The purpose of the latch is to allow the
upright components to remain in proper sequence during
normal operation. In the fully lowered position the inter-
mediate upright is latched to the outer upright and'the
inner upright is latched to the intermediate upright. As the)
mast is raised the latches are actuated by socket head
capscraws threaded into the back side of both the cylinder
crosshead and the left hand carriage roller bracket. For
latches to function properly, certain conditions must exist.
Refer to operation sequence and adjustment instructions
that follow:
1. At all times free latch movement is important. Bind-
ing could cause failure.
2. Stop pads are provided on the top crossmember of the
outer channel and the intermediate channel to carry
the weight of the channels when the mast is in the
lowered position. Pads are also provided on top of
the carriage roller brackets and cylinder crosshead to
carry the weight of the inner channel during extension.
3. Damaged or improperly shimmed channel stop pads
may cause latches to over travel. This over-travel
could cause latch failure.
4. Place shims under the stop pads on the outer channel,
intermediate channel, crosshead and carriage to hold
latch throat horizontal when actuated.
NOTE:
For proper latch mating description, see
Fig. 7 and 8.
5. An adjustable setscrew stop has been provided for the
intermediate channel latch. Adjust the stop to bring
the latch throat to a horizontal position. (Parallel
with top of the intermediate channel) See Fig. 7 and 8.
LATCH OPERATIONAL SEQUENCE
Sequence for masts with less than 100 percent freelift:
1. The carriage raises until one of the cylinder crosshead
latch actuating capscrews engages the inner channel
latches. The inner channel is rsleased from the
intermediate channel. The inner channel travels a
short distance before the second latch capscrew on
the cylinder crosshead engages the intermediate chan-
nel latches. The intermediate channel is now released
2.
3.
4.
5.
from the outer channel. At this point both the inner
and intermediate channels are latched to the cylinder
crosshead.
The carriage continues to move upward at twice the
speed of the channels.
As the carriage reaches the top of the inner channel,
the carriage latch capscrew releases the inner channel
from the cylinder crosshead. The inner channel at the
same time becomes latched to the carriage.
The mast now continues its upward movement until
the cylinder reaches the end of its stroke.
The lowering sequence is a direct reversal of the
previous steps.
NOTE: Refer to Fig. 7. Latch actuating capscrews
will appear at points "A" and "C".
Sequence for Masts with 100 percent freelift:
The carriage raises until the cylinder crosshead latch
actuating capscrew engages the intermediate channel
latch. The intermediate channel is released from the
outer channel and becomes latched to the crosshead.
The intermediate channel travels a short distance
before the carriage latch actuating capscrew engages
the inner channel latch. The inner channel is now
released from the intermediate channel and becomes
latched to the carriage.
The mast continues its upward movement until the
cylinder reaches the end of its stroke.
The lower sequence is a direct reversal of the pre-
vious steps.
NOTE:
Refer to Fig. 8. Latch actuating capscrew
will appear at point "B" only.
NOTE:
A.
B.
C.
D.
Improper carriage adjustment or lack of adjustment
could result in latch failure. (Refer to carriage
adjustment instructions)
Improper cylinder crosshead adjustment or lack of
adjustment could also result in latch failure.
(Refer to crosshead adjustment)
Improper thrust plug adjustment or lack of adjust-
ment could result in latch failure.
The latch carrying the weight of its respective
channel also could result in latch failure.