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STOW MS-93 MIXER — OPERATION MANUAL — REV. #5 (03/26/10) — PAGE 29
GEAR LUBRICATION
The surface of the pinion and main gear (Figure 32) should
be very lightly greased.
Figure 32. Pinion and Bull Gear Lubrication
STOW MS-93 PLASTER/MORTAR MIXER — MAINTENANCE (MIXER)
MAIN GEAR AND DRIVE PINION ALIGNMENT
1. Disconnect the spark plug wire (gasoline engines). If
mixer is equipped with an electric motor remove power
cord from AC power receptacle. In addition make sure
the clutch engagement lever is dis-engaged to relieve
V-belt tension.
2. The countershaft and drive pinion are mounted on a
slotted base. To align drive pinion with main gear, loosen
the pillow block mounting bolts and move them until the
necessary alignment has been made. Remember gears
must be paralleled aligned not skewed.
3. Using your hand, slightly move (rock) the drive pulley
back and forth to determine the amount of backlash.
Insert feeler gauge between gears to determine backlash
distance. Backlash should range between 0.007- 0.012
inches (Figure 30).
INSPECT TOOTH CONTACT BETWEEN MAIN GEAR AND
DRIVE PINION
1. Coat 3 or 4 teeth at 3 different positions on the main gear
with yellow paint.
2. Rotate the drive pulley in both directions.
3. Inspect the tooth pattern.
4. If gear teeth are not contacting properly (Figure 31), adjust
pillow block to correct the problem.
Figure 30. Drive Pinion and Main Gear (Backlash)
Figure 31. Gear Teeth Alignment
2. Fill the wheel hub (Figure 28) with grease to the inside
diameter of the outer races and also fill the hub grease
cap. Reassemble the hub and mount the wheel. Then
tighten the adjusting nut, at the same time turn the wheel
in both directions, until there is a slight bind to be sure all
the bearing surfaces are in contact.
Then back-off the adjusting nut 1/6 to 1/4 turn or to the
nearest locking hole or sufficiently to allow the wheel to
rotate freely within limits of .001" to .010" end play. Lock
the nut at this position. Install the cotter pin and dust cap,
and tighten all hardware.
NOTE
Grease main and pinion gears
every 250 hours of operation.
IMPORTANT! avoid over-
greasing. Excess grease will
accumulate contaminates and
cause premature wear.