Marshalltown Truss Screed - Manual (Page 9)

9
OPERATIONS
SECTION 1
BEFORE STARTING
Before starting the truss screed, there are a few items that need to be checked to prevent damage or personal injury.
• Make sure that bolts are secure and will not vibrate loose.
• Check jam nuts on top pipe to ensure that they are tight against the top pipe coupler.
• Check the hydraulic level in the tank for the hydraulic winches (if applicable).
• Check winch cables to make sure that they will not loosen during the screed run.
• Look over the forms to check for unevenness so that the screed will not hang up.
Ask yourselves these questions when preparing your screed for a job.
• What is the “exact” pour width?
• What is the slump?
• Is the slab flat, crowned, or inverted?
• What is the required surface tolerance?
• Choose screed type and size based on the above information.
• Are any accessories required?
• Do the winches work properly?
• What size and type of screed is required for this pour?
OPERATING
Operating your engine driven screed correctly will assist you in achieving the desired outcome of a pour. Follow the instructions below
to operate your screed correctly and you will be very pleased with your equipment.
Start the engine and slowly increase the throttle. •
Engage or turn winch handles simultaneously to keep the screed even. •
DO NOT adjust the throttle on the engine to slow down or speed up the hydraulic winches, use the flow controls instead. •
NEVER let the concrete build up on the front blade, this causes the screed to be stressed and is strenuous on the operators •
controlling the manual winches. The concrete should not go above the bolts attaching the blades. If this happens, stop the
screed and let the vibration do its job.
If the concrete is not being added at the appropriate rate, slow the screed down to compensate.
•
The speed at which the screed should be operated depends on the slump of the concrete. Pay close attention to the aggre- •
gates, slump and concrete modifying agents so that you can compensate for them. REMINDER! – DO NOT OVER – VI-
BRATE THE CONCRETE
Make sure that when you have completed the pour(s) that you clean the screed immediately to prevent concrete from curing in the
drive shaft and bearing, etc. Pressure washers are recommended for this job.