Zenith C-30HDG manual Clearing a Plugged Manifold, Stop the pump. Switch OFF the engine

C-30HDG PUMP — OPERATING INFORMATION

6.If a blockage occurs in a hose, “walk the hose” until you find thepointoftrouble.Thehosewillbesoftimmediatelypastthe blockage.If this happens at the start, disconnect the hose at the first coupling past the blockage.

Elevatethehoseatthatpointwiththeblockageareahanging down.

CAUTION - Hose Pressure Hazard

Whendisconnectinghoses,useextreme CAUTION!Thehose is under pressure!

Usingahammer,youcanpoundthedown-streamedgeofthe packed area until it is free to flow.Shake all of the sand and gravel out to the end of the hose. Before reconnecting the hose, start the pump and run a small amount of concrete out totheendofthehose.Thiswillassurethatalloftheseparation is out of the hose.

7.Clearing a Plugged Manifold

The manifold is plugged if the volume at the discharge end ofthehosestops,andthehoseissoft.Thedrivebeltswillstart to slip and the engine will lugdown.

Follow steps 7A through 7J to un-plug a clogged manifold.

DANGER - Clearing A Plugged Manifold

Duetopressurebuild-upinsidethemanifold,greatcaremust be taken when clearing a plugged manifold.

A.STOP the pump. Switch OFF the engine.

B.DO NOT open any of the delivery system joint clamps.

C.The senior operator must warn all others to stand at least 20 feet away from the pump and turn their heads away from the manifold.

D.The operator must position himself/herself away from the hinged side of the manifold.

E.Wearingsafetyglasses,grasptheclamparmweldment andcarefullypullitopentotheprimary(safety)position. STOPcount to 20.Thiswillallowthepressuretorelease.

F.After the pressure has been released, open the clamp arm weldment and swing the hinged discharge cone open.

G.Removeblockagewitharound 2-footlengthofreinforc- ing steel rod. Flush the manifolds with water.Make sure the (3” x 2”) reducer is clear of any blockage before closing the discharge cone.

H.After the blockage has been cleared and the pump manifold has been thoroughly flushed with water, close the hinged discharged cone and lock into place.

I.Beforereconnectinghosetothereducer,starttheengine and pump two or three shovels of concrete through the reducer.This will insure that all the blockage has been cleared.

J.Shakeoutaround2feetofconcretebeforereconnecting hose to pump.After this is done, connect hose to pump and resume the pumping operation.

8.Avoiding Setting of the Mix in the System

To avoid setting of the concrete mix in the system when waitingmorethan30minutesbetweenconcreteloads,flush the system depending on job factors (such as presence of accelerators and job site temperature) and your particular mix design.

Clearing a Mix from the System

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

CAUTION - Hose Pressure Hazard

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

1.Disconnectthehosesfromthepumpandwashthepumpout immediately.Forexample:Ifyouhad200ft.ofsystemout,you would disconnect each hose.

2.Reconnect the first hose and fill the hopper with water. DO NOT try to push all the concrete out of all of the hose lines at onetime.

3.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 factors affecting the mix.

MAYCO C-30HDG PUMP — OPERATION AND PARTS MANUAL — REV. #6 (04/02/12) — PAGE 31