Chain Adjustment - Cascade Viewmast M2T Installation And Service Manual

7. Hydraulic line removal - see
step
4
of
Mast
Removal
and Disassembly.
8. Lowering control valve removal - see step 9 of Mast
Removal and Disassembly.
9. Hoist cylinder may now be lifted up and away from the
mast.
INSTALLATION:
Installation is a direct reversal of the previous steps.
NOTE: Air bleeding is required. See
step
8
of
Mast
Installation Instructions.
HOIST CYLINDER DISASSEMBLY:
Care must be taken in disassembly and reassembly to pre-
vent damage to the chromed surfaces of the primary and
secondary plunger. Any nicks or scratches on these com-
ponents must be made smooth by using a fine grit emery
paper.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Lay cylinder on suitable supports to prevent rolling
during disassembly. Provide a suitable container to
store and protect all components from damage and con-
tamination during repair.
Using a suitable spanner wrench, loosen the head
locking ring at the base of the cylinder. The head can
now be unthreaded and removed.
Using the same type of wrench as required in Step 2,
unthread the retainer from the shell. This retainer is
located at opposite end of the shell from the head.
The primary and secondary plungers may now be re-
moved from the base end of the cylinder shell.
NOTE: Reasonable care must be taken not to damage
the plunger surface.
Lay the assembled primary and secondary plungers on
a "V'd" wooden support.
Once again, using a spanner wrench, unthread the
retainer
out
of the primary plunger.
NOTE: To keep the primary tube from turning, a pin
type spanner wrench may be inserted in four holes
provided at the base end.
The secondary plunger is now free and should be
carefully pulled out of the primary plunger.
Remove the piston from the base end of the secondary
plunger. This is retained by a spiral snap ring.
NOTE:
A. A cavity is provided in the secondary plunger for
oil leakage which has occurred during the normal
life of the piston packing.
This oil must be
drained before reassembling the cylinder.
B. If oil leakage becomes excessive before piston
packing is replaced, a cartridge type relief valve
has been provided to transfer the oil (which the
cavity cannot hold) back into the base of the hoist
cylinder. (See Fig. 14)
Remove the cartridge relief valve located in the base
of the secondary plunger. This is held in position by
a spiral snap ring.
NOTE:
A. It is a good policy to replace the 0-ringaround the
O.D. of the relief valve.
B. If the relief valve requires replacement, it must be
replaced as a complete unit.
Pull out the self-adjusting bushing and packing
assembly from the top side of the cylinder shell.
Page 5
11. Inspect all parts for wear and damage.
NOTE: Replace all packing, O-rings, back-up rings
and wipers regardless of appearance or wear.
ASSEMBLY:
Assembly is a direct reversal of the previous steps with
exception as noted below.
NOTE: Thoroughly clean all parts to be installed in the
cylinder with solvent. All components should be coated
with a liberal amount of petroleum jelly or hydraulic oil
before being installed in the cylinder.
CARRIAGE ADJUSTMENT
The carriage is provided with four adjustable side thrust
rollers. Minimum clearance between the carriage and the
inner channel can be maintained by proper roller adjust-
ment. For adjustment, the following steps are recom-
mended.
1.
2.
3.
4.
5.
6.
Actuate the truck valve lever to raise the mast car-
riage approximately 45 inches above, the floor.
The
roller adjustment screws should be accessible at this
point.
Loosen all four locking screws approximately two turns.
Rotate clockwise all four roller adjustment screws
evenly until carriage looseness has been removed.
NOTE: Both steps 2 and3 require Allen type wrenches.
NOTE: Carriage must be centered within the inner
channel after adjustment is completed. This can be
checked by measuring the distance on each side
between the outside of the carriage roller bracket and
the inner edge of the inner channel.
Tighten all four locking screws securely.
Raise and lower carriage in the free lift area to ensure
free movement at all points.
NOTE: The mast inner channels are designed to be
slightly narrower at the top than at the bottom. If the
side thrust rollers have been too tightly adjusted, the
carriage may bind as it reaches the top of the inner
channel.
Pads are provided on the top of the carriage roller
brackets. Shimming usually is only required at the
time of the manufacture to compensate for the uneven
surface on the bottom side
of the inner channel
crossmember.
CROSSHEAD ADJUSTMENT
1.
2.
3.
Shims have been providedunder each brass wear shoe.
As wear occurs, adjustment will be required.
The crosshead must be removed to make adjustment -
see mast removal and disassembly instructions.
Sufficient shims should be added under each wear
shoe to center the cross-head between the intermediate
channels.
NOTE: After adjustment, clearance between wear
shoe and mast channel should not exceed l/16 inch.
CHAIN ADJUSTMENT
Chain adjustment is located on the front side of the outer
upright lower crossmember.
When making chain adjust-
ment, two factors should be taken into consideration.
1. Chains should be adjusted so as to be equal in length.
When chains are evenly adjusted the two points at
which the chains anchor to the carriage yoke will be
equadistant from the bottom of the upper fork bar.
2. The second factor is the relationship of the carriage
to the upright when the carriage is completely lowered.
This should be as follows: