Multiquip ST-45HRM CE ST-45HRMCE CONCRETE PUMP— OPERATING PROCEDURES, Clearing Concrete Blockage

ST-45HRM CE CONCRETE PUMP— OPERATING PROCEDURES

C.Mix the prime to the consistency of a smooth batter.

D.Position the first ready-mix truck at the hopper. Check the concrete. DO NOT discharge concrete into hopper at this time.

The bentonite is not compatible with

NOTE concrete. DO NOT pump it into the forms. Discharge it out of the formed area.

E.Pour approximately two 18.9 liter (5 gallon) buckets of prime into the first hose and connect it to the pump.

F.With the pump in FORWARD at 25-30 strokes per minute, slowly discharge the concrete from the ready- mix truck into the hopper and completely fill it.Keep the pump running continuously until concrete is discharging at the end of the delivery system. If the pump is stopped during this procedure, a blockage may occur.

G.If it is necessary to replace or add a section of delivery system,aftertheinitiallubricationprocedure,wettheinside area of the hose, pipe or elbow with 18.9 liters (5 gallons) of water per 7.62 meters (25 ft.) length, before adding it to thesystem.

Clearing Concrete Blockage

13.Damaged hoses with internal restrictions can cause block- ages.

14.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.

15.Elevatethehoseatthatpointwiththeblockageareahanging down. Using a hammer, you can pound the down-stream edge of the packed area until it is free to flow.Shake all of the sandandgravelouttotheendofthehose.Beforereconnect- ing 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.

CAUTION

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

16.The shuttle tube is plugged if volume at the discharge end of thehosestops,the hoseissoftandthehydraulicoilpressure gauge reads 20.7 mPa (3000) psi or more.

To clear a plug in the shuttle tube, great care must be taken as a dangerous condition will exist from pressure build-up inside the shuttle tube. (With the shuttle valve, the concrete can be pumped in reverse.) Use the following prodedures to clear the shuttle tubes.

WARNING

DO NOT open any of the delivery system joint clamps.

“Reverse” Pumping Procedure

A.Switch the pump into reverse. With pump speed at a medium-slow (approx. 12 strokes per min.) try to pull the “pack” back into the hopper with 5 or 6 reverse strokes.

B.Remix the concrete in the hopper.

C.Switch the pump into forward. If it is still plugged, repeat “Reversing” procedure three times.

If concrete still does not move, proceed to the Shuttle Tube Inspection Procedure.

Shuttle Tube Inspection Procedure

A. Stop the pump. Switch off the engine.

BThe senior or most experienced operator must warn all others to stand at least 6.1 meters (20 feet) away from the machine and turn their heads to face away from the pump.

CAUTION

Saftey glasses MUST be worn at all times when operating the ST-45. Failure to fol- low saftey guidlines can result in serious injury.

C.The operator will position themself beside the reducing elbow at the pump outlet. Wearing safety glasses, slip the end of a pry bar (61 cm/24" length of reinforcing steel rod) under the latch of the hose clamp and flip it up.

PAGE 26 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)