Marshalltown SP684 SURFACE SHARK Surface Planer - Manual (Page 19)

SP684 SuRFACE ShARK SuRFACE PLANER PAGE 19
The most widely used drum is of the two section
design. FIGuRE 13. It incorporates two half sectioned
side plates that are positioned on the center shaft to
facilitate optimum flail spacing. The half side plate
sections also provide additional stability and structural
rigidity for the drum rods. The two section drum can
accommodate the use of all flail designs while meeting
the most demanding job applications.
FIGuRE 13
General Notes Regarding Flail Drums:
1) Flail drum rods are held in position by end caps and
related fasteners. The end caps are heat treated to
extend their service life.
2) The countersunk Allen head capscrews are retained
to the flail drum by both self locking, hexagon head
nuts and lock washers. The lock washers provide
additional redundancy while eliminating open, exposed
threads that can become worn or damaged from field
use. A countersunk Allen head capscrew was chosen
over a conventional hexagon head capscrew to
eliminate anticipated wear. Component wear would
substantially increase the difficulty of disassembling
drum components in the field. before removing
these capscrews, clean the internal hexagon with an
appropriate tool to help facilitate their removal.
3) Flail rods are not intended to rotate in the drum
assembly while the Surface Planer is in operation.
Severe operation can cause the drum plates to wear
and elongate. Drum rods are also subject to wear and
elongation. If the total amount of wear is not severe,
various types of high strength, anaerobic adhesives
can be utilized to secure the rods to the drum. Severe
component wear is always an immediate reason to
reject either the rods and/or drum and replace with
factory approved, replacement parts.
4) Regularly inspect the drum for excessive wear and
signs of fatigue. Random vibration caused by the
planing process is difficult, if not impossible, to fully
predict. Component service life is impossible to predict.
Work surface materials, operator techniques and
general maintenance are also contributing factors that
will limit the service life of the drum and/or components.
If there is any question regarding the structural integrity
of a drum or any component, properly discard and
replace with factory approved, replacement parts.
5) It is advisable to always have a minimum of
one spare, loaded drum available to increase job
site productivity and reduce down time. Replacing
worn flails is a job that can require from only a few,
short minutes to even hours for extremely worn and
damaged components. Replacing a drum on the
driveshaft can usually be accomplished in a matter
of a few minutes. It is a common practice to replace
worn flails during normal, unproductive time and keep
a number of loaded, replacement drums on the job site
to speed production rates.
INSTALLING FLAILS ON THE TWO SECTION
DRUM
All flails are assembled on the two section drum in
sequence patterns with the spacer washers. Spacer
washers provide for an overlapping effect of the flails
that produces consistent material removal from the
work surface.
Normal Installation Procedure (fine finish) for all
1/8 Inch Nominal Thickness Flails:
1) Install a flail next to the outside side plate of the
narrow section. Next, install a spacer washer. Follow
with a flail and continue the sequence until the section
is full. FIGuRE 14.