Marshalltown 1200MP Mixer - Manual (Page 8)

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OPERATING GUIDELINES
MASONRY CONSTRUCTION GUIDELINES
The strength and durability of brick masonry depends upon the quality of the brick, the quality of the mortar and the
workmanship in laying. The strength also depends upon adequate bond and the shape of the masonry unit.
Brick quality – Characteristics are hardness and density. Brick for masonry which is exposed to weather or where strength
is desired should have a crushing strength of not less than 2500 PSI.
Laying and bonding – Brick should be laid in a full bed of mortar and shoved laterally into place to secure solid bearing, a
bed of even thickness, and to fill the vertical joints. Brick should be thoroughly wet before laying, except in freezing weather.
Bricks laid with the long dimension parallel to the face of the work are called stretches, perpendicular to the face are called
headers. Bats (chalk bricks) should not be used except where necessary to make corners or to form patterns on the face of
the walls. Walls are bonded or tied together longitudinally by overlapping stretches in successive courses. Transverse bond
is obtained by making every sixth course headers with the headers themselves overlapping in successive courses in the
interior of thick walls.
Mortars – Mortar composition is dependent on the structural use of the masonry unit. It is also dependent upon grade,
weather exposure and climactic condition. Consult you brick or block supplier, the ACI (American Concrete Institute) Manual
of Concrete Practices or your local building codes for the proper mortar selection for each application form more information.
LUBRICATION
To avoid personal injury, always turn off engine/motor and wait for all motion to stop before making
adjustments or repairs
DRUM SEAL HOUSINGS
Drum seals are provided on each end of the drum where the mixing shaft passes through to the bearings. It is important to
pump grease into the housings through use to retain seal efficiency. Use enough grease to flush out old grease and carry
away any grit. Use lithium based grade 2 multi-purpose grease. SEE FIGURE 3
MIXING SHAFT BEARINGS
The mixing shaft bearings are permanently factory sealed and lubricated, and should
not require further service.
WHEEL BEARINGS
Wheel bearings should be packed once a year. Thoroughly clean old lubricant from the
bearings, hub and spindles before repacking. Pack bearings only one-half to two-thirds
full with grease to prevent overheating. Use no. 2 wheel bearing grease.
DRUM SHAFT BEARING HANGERS
Drum yoke bearing hangers are located on each side of the drum, and are equipped
with grease fittings. These bearings should be lubricated once each week with lithium based grade 2 multi-purpose grease.
ENGINE/MOTOR
Refer to the engine/motor operating instructions for all maintenance and lubrication instructions and requirements.
JACK SHAFT BEARINGS
Pillow block style bearing are used on the drive train counter-shaft. See Drum Seal Housing, Lubrication Guidelines for
more information. See Figure 4 for bearing locations.