Multiquip LS400, LS500 manual Clearing the System After MIX SET UP, Clearing Concrete Blockage

LS400/LS500 PUMP — PUMPING INFORMATION

Using this procedure will make it easier to pump through the clean hose. Note: 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.

6.Hose sizing is very important: We strongly recommend on harsh mixes, vertical pushes, stiff concrete, shotcrete, long pushes, that a 2 -1/2” line be used as far as possible. The advantages of using the 2 -1/2” line are improved pumpability, less pumping pressure and less wear on the pump.

7.Following the pump operation, proper wash out of all materials or “build-up” within the pump manifold and hoses will prevent problems when starting the next job.

8.A thorough inspection of the drive components and greasing of all bearings after each job will ensure ad- equate lubrication and service to the pump which is normally operating in wet, gritty conditions.

Over-greasing any bearing on your Mayco pump will not damage the bearing.

CLEARING THE SYSTEM AFTER MIX SET UP

If, for any reason, the mix should set up in the system, the following procedure is suggested:

1.Disconnect the hose from the pump and wash the pump out immediately.

WARNING - HOSE/LINE PRESSURE

When disconnecting hoses, use EXTREME CAUTION! The hose is under pressure!

2 Reconnect the hose and fill the hopper with water.

3.Reconnect the hose and fill the hopper with water. DO NOT try to push all the concrete out of all of the hose lines at one time.

For example: If you had 200 ft. of system out, you would disconnect each hose. Clean it out by pushing water through the first hose off the pump, then continue progressing through all the hoses, until all the system is clean.

4.If waiting time is excessive, it would be wise to wash out the pump and hoses and start over when the new truck arrives. This can be avoided by being observant to the pump and system, also taking into consideration the above actors (A through D) affecting the mix.

CLEARING CONCRETE BLOCKAGE

WARNING - BLOCKAGES

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.

If a blockage occurs in a hose, walk the hose until you find the point of trouble.The hose will be soft immediately past the blockage. To clear the blockage:

1.Disconnect the hose at the first coupling past the blockage.

WARNING - HOSE LINE PRESSURE

Use extreme care! The hose line is under pressure and can cause serious injury.

2.Elevate the hose at that point with the blockage area hanging down.

3.Using a hammer, you can pound the downstream edge of the packed area until it is free to flow. Shake all of the sand and gravel out to the end of the hose.

4.Before reconnecting the hose, start the pump and run a small amount of concrete out to the end of the hose.This will assure that all of the separation is out of the hose.

Damaged hoses with internal restrictions can cause blockages.

PAGE 34 — MAYCO LS400/LS500 PUMP — OPERATION AND PARTS MANUAL — REV. #6 (09/19/11)