UNI-SCREED MANUAL
AND PARTS LIST
13
OIPB
– B19040
OPERATION OF THE UNISCREED
OPERATING PRINCIPLE
An eccentric weight mounted on the exciter shaft contained within the vibration housing
is driven at high speed by a clutch drive system. This high-speed shaft revolution causes the
rapid vibratory motion of the blade as well as imparting a forward motion. The Morrison Uni-
screed is designed to run at an engine speed (engine take off shaft) of 3600 rpm. (Normally
considered full throttle). Running the engine at lower rpm’s will result in a decrease of
consolidation force and lower
travel speed. It will create excessive “out-of-synch” vibrations
resulting in poor consolidation, maneuverability, excessive wear to the machine, and discomfort
to the operator.
STARTING PROCEDURE:
WARM CLIMATE
Open fuel valve on gas tank. Set throttle lever to “Fast” idle position, set choke to closed
position, start engine. Open choke slightly to prevent floodin
g. Move to “Open” or “Run” position
when engine is warm, increase throttle to maximum operation position (3600 rpm).
STARTING PROCEDURE:
COLD CLIMATE
Follow same procedure as above but allow longer warm-up period
– 3 to 5 minutes. In
cold weather, oil is much heavier to move and requires more time to work its way into the
moving parts. If maximum power is not attained, allow further warm-up time. Fill fuel tank with
clean gasoline, use safety approved gas containers. DO NOT MIX OIL WITH GASOLINE
–
USE UNLEADED GAS ONLY.
STOPPING PROCEDURE
1. Throttle engine down.
2. Depress or turn off stop switch.
OPERATION
1. On level surfaces the Uni-screed moves forward or backward rapidly, depending on the tilt of
the handle. On uneven surfaces or inclines, light forward pressure on handle may be required
to assist the Uni-screed in moving. Lean the handle up or away from you to make the Uni-
screed travel toward you (i.e. forward). Lean the handle down or toward you to make the Uni-
screed travel away from you (i.e. backward).
2. ALWAYS OPERATE THE MACHINE AT FULL THROTTLE. If excessive vibration is felt
through the handle, do not operate until the engine is checked and set at its maximum running
speed of 3600 rpm.
3. The handle has four (4) adjustment clamps to allow the operator to use the Uni-screed more
comfortably. Ensure that the screws of all the clamps are tightened to securely hold the handle
sections rigidly. A loose clamp will cause that section to rotate and/or slide away from the
desired position.
LUBRICATION- ENGINE OIL-
Always check engine oil before starting and at regular intervals
thereafter. Use proper engine oil as recommended. Keep engine oil clean, change accordingly.
Fill crankcase to levels as recommended in manufacture
r’s engine manual.
