NF RMP-624 MINI BRUTE

As soon as a problem is noticed, immediately remove the disposable plastic mixer nozzle and try dispensing material. This may prevent or purge material cross-over if it has not already hardened. After the static mixer is removed, THEN check the following:

• Is the mixer nozzle plugged? (material set up)
• Is there sufficient air supply?
• Is there sufficient material supply?
• Is the air regulator set at desired pressure?

Do a ratio check at the dispense valve:

• Check to see if there is flow from both pumps.
• Check to see if the pump outlet valve is cutting off material and also that it is not sucking air in the return stroke.
• Check phasing. Is one material flowing before the other?
• Measure volume output of each material.

If ratio check is not correct, the problem is in the meter.

• Supply blockage or low material. (viscosity too high)
• Pump seal worn.
• Outlet check valve not sealing.
• Air entrapped in pressure tube.

MINI-BRUTE Troubleshooting Guide

Start-up

• Make sure “A” and “B” supply valves under containers are open.
• Check level of materials in containers, making sure level is always over 1/3 filled. Use diverter plates (if tunnel down center of material occurs) if void in material develops.
• Clean off applicator dispense head with plastic mixer nozzle removed. Trigger applicator into waste container to verify smooth, air free flow of both materials. Wipe head clean and coat head with compatible lubricant (petroleum jelly or other lithium-based grease).
• Place new plastic mixer nozzle on applicator block and secure with the retainer nut. NOTE: For some high pressure and high flow rate systems, a mixer retaining housing may be required to avoid cracking plastic mixers.

Shut-Down

• Turn off main air supply or disconnect it.
• Remove plastic mixer nozzle.
• Trigger applicator to relieve any pressure in lines or system. Materials may ooze out of the applicator or, open “A” and “B” valves below pressure gauges.
• Clean head of applicator and coat with compatible lubricant.
• Grease lubers and automatic dispense valve with petroleum jelly or other lithium-based grease.
• Wipe metering rods off and coat with compatible lubricant (petroleum jelly or other lithium-based grease).

Daily Maintenance

• Never permit either material tank to get below approximately 1/3 full.
• The most common cause of “cross-over” (materials hardening inside the applicator and hoses) is air in one or both materials. Damage and cost from cross-over is NOT covered under AST Corporation Warranty.
• Diverter discs and follower plates are a means of avoiding air entering materials. If high viscosity materials are being used, the operator must become informed in the use of these items prior to the starting of the system
• If gauges exhibit pressures that “peg” the gauge dial, immediately reduce air pressure at the systems air regulator.
• Do NOT install a disposable mixer nozzle to the applicator until positive air-free flow is achieved from both outlets of the applicator block tip.
• Air can be trapped in hoses during the filling of a new system at the time of hose replacement. To avoid trapping air, arrange the hose to obtain a continuous, gradual upward slope of the hose from the system hose fitting to the applicator while the system is cycling. Point the applicator tip upward to let the material push all the air out.

Questions?? Call us! If you’re with the machine, we can walk you through the procedure for start-up and shut-down. Ask for Technical Assistance at (763) 592-2060.

Clean and Lubricate Exposed Pump Rods

• Remove and clean any material residue or film with compatible solvent (damp pad only – do not pour solvent)
• Lubricate with compatible lubricants. (Material film on shaft is normal)

Check Air Supply for Clean Air

Ratio Check Test

• Remove the retainer cap or mixer nozzle.
• Trigger applicator; two separate beads of material will appear; compare for correct volume.

Seal / Pump Check Test

• Turn air pressure regulator down all the way
• Place a waste container or drop cloth under the purge valve (ball valve below gauge) and open the valve opposite the pump to be checked. EXAMPLE: to check “A” open “B”.
• Disconnect the air line, (black or clear 5/32″ tube) coming from the unidirectional (gray) valve, at the tube fitting on the 4-way valve the tube connects to. Plug or pinch off the tube. This will prevent the automatic dispense valve from opening.
• Trigger or actuate the unit and slowly turn the pressure up until rods move forward and stall against pressure (pressure gauge on “A” side should read 300-500 psi; “B” gauge should read “0” psi). If it stalls and pressure registers, the pressure seal is good. If the system does not stall, and it takes a long cycle or an additional cycle, there is either air trapped in the pressure tube, the pressure seal is bad, or material is not being supplied.
• Release signal; cylinder will move back and pressure should hold on gauge. If pressure drops, outlet check valve is failing. Clean or replace.
• Repeat sequence on other side closing “B” and opening “A” valve. This will check other side.