general information
Fill the hopper with water after making sure that all sand and rock have been removed from manifold. Operate pump at full throttle and the 3/8" diameter hole restriction will create sufficient back pressure to make thorough inspection of all moving parts.
The Effects Of Heat And Excessive Time On Concrete:
Hot concrete, commonly referred to as a hot load, is concrete that has been in the
A brief explanation of why heat and time affect concrete:
Concrete starts setting by drying up through a chemical reaction. The catalyst to this reaction is heat. When pumping a hot load, it is important to remember that when you have to stop pumping for any reason, add water to the concrete in the hopper and hand mix and move concrete in the hose every 5 minutes. If the shut down time becomes too long, wash out immediately.
If it is necessary to wait 1/2 hour or more for another load of concrete, to prevent setting of the mix in the system, it is advisable to consider the following factors (A through D) affecting the concrete:
How old is the concrete?
Is there an accelerator, calcium chloride, red label, etc., in the concrete?
The temperature of the day, 80, 90, degrees?
How much system you have out and how stiff was the mix you were pumping?
Preventing Mix Set-Up After Pump Shutdown
When the pump is stopped for any reason during a pour; e.g., moving hose, waiting for
1.Leave the hopper full of concrete at the time of shutdown. It is important not to let the
2.If the shutdown period exceeds 2 to 3 minutes, turn off the engine so the vibration does not separate the mix in the hopper which can cause a blockage in the manifold when the pump is started.
3.If it is necessary to wait 10 minutes or more for another load of concrete, it is wise to start the pump and pump 6 or 8 strokes every 5 minutes to prevent setting of the mix in the system. If waiting time is excessive, it would be wise to wash out the pump and hoses and start over when the new truck arrives.
4.When pumping stiff mixes and there is waiting time between
5.When the pumping job requires a stiffer mix, the following method is suggested for starting:Take a water hose with a nozzle on it and apply water with a fine spray to the concrete as it comes down the
6.Using this procedure will make it easier to pump through the clean hose.
NOTICE
Once the concrete has reached the end of the hose, DO NOT apply any more water in this manner as this procedure is used for starting only.
7.Hose sizing is very important: We strongly recommend on harsh mixes, vertical pushes, stiff concrete, shotcrete, long pushes, that a
8.Following the pump operation, proper wash out of all materials or
9.A thorough inspection of the drive components and greasing of all bearings after each job will ensure adequate lubrication and service to the pump which is normally operating in wet, gritty conditions.
NOTICE
page 18 — MAYCO LS600P CONCRETE PUMP • operation manual — rev. #0 (05/13/13)