User manual GRACO NXT HIGH-FLO 4-BALL PUMPS PARTS LIST

[. . . ] Instructions - Parts List NXT® High-Flo® 4-Ball Pumps 3A0538C ENG Air-powered pumps for low pressure, high volume circulation of finishing materials. Do not use for flushing or purging lines with caustics, acids, abrasive line strippers, and other similar fluids. Important Safety Instructions Read all warnings and instructions in this manual. See page 3 for model information, including maximum working pressure. [. . . ] Units with runaway protection only: enable the prime/flush function by pushing the prime/flush button on the DataTrak. Slowly turn pump air regulator (L) clockwise, increasing pressure until pump starts. Cycle pump slowly until all air is pushed out and pump and hoses are fully primed. Stop the Pump at the Bottom of Its Stroke Relieve the pressure when you stop the pump for any reason. Stop the pump on the downstroke, before the air motor changes over. NOTICE Failure to stop the pump at the bottom of its stroke allows fluid to dry on the piston rod, which can damage the throat packings and the TSL pump piston seal when the pump is restarted. Shutdown Follow Pressure Relief Procedure, page 11. Always flush the pump before the fluid dries on the displacement rod. See Flushing on page 12. 3A0538C 11 Maintenance Maintenance Preventive Maintenance Schedule The operating conditions of your particular system determine how often maintenance is required. Establish a preventive maintenance schedule by recording when and what kind of maintenance is needed, and then determine a regular schedule for checking your system. Your maintenance schedule should include the following: Stall Test Perform a stall test periodically to ensure the piston seal is in good working condition and prevent system overpressurization: Close the fluid shutoff valve (D) closest to the pump on the downstroke and be sure that the pump stalls. Open the fluid shutoff valve to restart the pump. Close the fluid shutoff valve (D) closest to the pump on the upstroke and be sure that the pump stalls. NOTICE Do not allow the pump to run quickly for a long period of time as this may damage the packings. Stop the pump on the downstroke, before the air motor changes over. NOTICE Failure to stop the pump at the bottom of its stroke allows fluid to dry on the piston rod, which can damage the throat packings and the TSL pump piston seal when the pump is restarted. Flushing · Flush before changing colors, before fluid can dry in the equipment, at the end of the day, before storing, and before repairing equipment. Check connectors for leaks and tighten as necessary. Flush with a fluid that is compatible with the fluid being dispensed and the equipment wetted parts. · · Air Line Filter Drain and clean as necessary. Mix Tank Volume Do not let the mix tank run dry. When the tank is empty, the pump demands more power as it tries to suck in some fluid. This causes the pump to run too fast, which can seriously damage the pump. 12 3A0538C Maintenance Changing the TSL Check the condition of the TSL and the level in the reservoir every week, minimum. TSL should be changed at least every month. 206995 Throat Seal Liquid (TSL) carries residue from the pump rod into the reservoir. Discoloration of the TSL fluid is to be expected during normal operation. After some time the TSL will thicken and darken, and must be replaced. [. . . ] With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco's written recommendations. This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or maintenance of structures, accessories, equipment or materials not supplied by Graco. [. . . ]