ST-45 PUMP — OPERATING PROCEDURES

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 redi-mix truck in excess of 2 to 3 hours. On a hot day, this amount of time is even less. A brief explanation of why heat and time affect concrete:

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 theshutdown time becomes toolong,wash out immediately.

Admixtures:

9.Remixtures that are designed into the concrete mix by the redi-mix company or anarchitectural engineering company. This section lists common admixtures and a brief explana- tion of their functions:

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 redi-mix concrete ticket.Before start- ing the pumping job, ask the driver of the redi-mix truck to see the concrete ticket and note the admixtures that exist and take the proper action.

10.Whenpumpinglongdistanceorpumpingstiffmixes,youcan expectadropinvolumecomparedtoshorterlinesandwetter mixes due to the change in valve efficiency or cavitation.

11.Leakingmanifoldsealsorhosecouplinggasketswhichleak 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 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 ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 25

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Multiquip ST-45HRM manual Pumping Tips, Admixtures, Priming the Pump and Delivery System with Slurry
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ST-45HRM specifications

The Multiquip ST-45HRM is a highly versatile and robust soil compactor designed for various construction applications. With its advanced engineering and innovative technologies, it sets a new standard in the compaction equipment market. This model is particularly favored for its reliability, durability, and exceptional performance in both small-scale and large-scale projects.

One of the standout features of the ST-45HRM is its powerful engine. Equipped with a high-performance, fuel-efficient diesel engine, it delivers ample power while ensuring reduced fuel consumption. This results in not only lower operational costs but also decreased environmental impact, aligning with today's sustainability goals.

The compactor's dual-directional capability allows for efficient operation in compacting various soil types. Whether tackling granular, cohesive, or mixed soils, the ST-45HRM adapts seamlessly, ensuring optimal performance. Furthermore, it features a unique vibratory system that maximizes compaction efficiency, enabling faster job completion and minimizing the number of passes required.

Operator comfort and safety are paramount in the design of the ST-45HRM. The machine is equipped with an ergonomic operating platform and intuitive controls, allowing for easy maneuverability even in tight spaces. The advanced vibration dampening technology significantly reduces operator fatigue, making long hours of operation more manageable.

Additionally, the ST-45HRM offers impressive maneuverability, thanks to its compact size and precise control. This is particularly beneficial for working in confined areas, such as urban construction sites where space is limited. Its robust construction ensures it can withstand the rigors of challenging job sites while maintaining performance.

Maintenance is made simple with the ST-45HRM. The design allows for easy access to key components, reducing downtime and enhancing productivity. Regular service intervals and the use of quality materials ensure the longevity of the machine, making it a smart investment for contractors looking for reliable and efficient compaction equipment.

In summary, the Multiquip ST-45HRM combines powerful performance, innovative technology, comfort, and ease of maintenance into a single, versatile package. It is an ideal choice for contractors seeking a dependable soil compactor to meet the demands of various construction projects. With its impressive features and capabilities, the ST-45HRM stands out as a leader in the field of soil compaction.
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