WARNING
Common sense tells us that if you drive a truck into a brick wall, something is going to be damaged.The same holds true with your concrete pump. If you repeatedly pull the throttle all the way out and try to force your pump to push through blockages due to
separation of material in the hose or manifold, you will soon have breakdowns and costly repairs which are not covered under warranty.If a blockage occurs, find where it is and clear it before further pumping. DO NOT increase the engine speed to clear the blockage. Increasing the engine speed will only compound the problem.
WARNING
It will be necessary at times to move your pump from one job site location to another. Before moving the pump, make sure to pump the remaining concrete out of the hopper. Moving the pump with a full hopper of concrete can cause severe damage or breakage of the axle and axle springs, excess
strain and pressure on the hub and bearing assembly.
Pumping Tips
The effects of heat and excessive time on concrete:
7.Hot concrete, commonly referred to as a hot load, is concrete that has been in the
8.Concrete starts setting by drying up through a chemical reaction.Thecatalysttothisreactionisheat. Whenpumping a hot load, it is important to remember that when you have to stoppumpingforanyreason,addwatertotheconcreteinthe hopper and hand mix and move concrete in the hose every 5 minutes. If the shut down time becomes too long, wash out immediately.
Admixtures:
9.Remixtures that are designed into the concrete mix by the
A.Pozzolith 300 – or the equivalent acts as a water retarderandalubricant.Onaleanmix,longpushes,stiff mixes, and vertical pushes, Pozzolith 300R helps pumpability.
B.MBVR – air entraining, acts as a lubricant.
C.Calcium Chloride – commonly referred to as C.C., is used as an accelerator. When pumping a load with calcium chloride, it is recommended that you wash out if the waiting time between delivery trucks becomes too long.
D.Super Plasticizers – acts as an accelerator.The concrete will look very wet after the super plasticizer is added, but will begin to set up very fast.Wash out immediately if you do not have a truck waiting. Super plasticizers are used mainly on commercial jobs.
E.Red Label – actsasawaterretarderandanaccelerator. Red label will be used mainly on commercial jobs.
F.Fly Ash – is used to help increase the strength of the concrete and decrease the cement content per yard. This is one of the most common admixtures used.
All admixtures will be shown on the
NOTE
10.Whenpumpinglongdistanceorpumpingstiffmixes,youcan expectadropinvolumecomparedtoshorterlinesandwetter mixes due to the change in valve efficiency or cavitation.
11.Leakingmanifoldseals orhose coupling gaskets which leak watercancauseseparationandsubsequentjammingatthat point.
Priming the Pump and Delivery System with Slurry
12.It is CRITICAL to the successful operation of a concrete pump that the manifold and all delivery hose, pipe and elbows are coated with a film of lubrication BEFORE you attempt to pump concrete. Failure to properly prepare the pump and system will result in a “dry pack” of concrete, blocking the shuttle valve tube or delivery line.
A.With the entire delivery system connected to the pump. Except for the first hose. Pour 18.9 liters (5 gallons) of water into the second hose and push in your clean out ball and reconnect.This will help hold back the prime.
B.There are several things you can use for the prime. A few examples are Cement and lime at a 50/50 mixture, slick pac, bentonite clay.
MAYCO
