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Form L-4083 (1/06) 6 Shertech Operating Instructions, Performance, Specifications and Parts Manual Bronze Models GCBN2V, GCBN3V, GCBN22V and GCBN33V Cast Iron Models GCCV2V, GCCV3V, GCCV22V and GCCV33V 6. Be certain all suction piping connections are airtight. NOTE: Assure airtight pipe connections with the use of a pipe joint sealant. DISCHARGE 1. Attach discharge piping to the discharge outlet. Support pump and piping during assembly and after installation. Failure to do so may cause piping to break, pump to fail, motor bearing failures, etc. All of which can result in property damage and/or personal injury. NOTE: Should the pump need to be self-draining, the pump head should be mounted in the vertical position with the suction port facing down. When pumping high viscosity fluids, the vertical position can be used with the suction port facing up and the pump mounted under the source. Increasing the suction pipe size and eliminating bends and elbows also assists in pumping high viscosity fluids. Max. viscosity is 500 SSU at 1725 RPM. 2. If a shut-off valve or handgun is required in discharge line, provide a pressure relief valve for pump protection. Shutting off discharge without providing pressure relief can cause extreme over-pressure which can result in pump and/or motor failure. Do not exceed 100 PSI pump or system pressure. 3. Operation under shut-off discharge conditions will overheat and damage pump. NOTE: Globe valve or other restrictive valves should not be used as shut-off mechanism as they are restrictive in nature and will seriously affect pump performance. 4. After all piping and controls (not supplied with unit) have been installed, unit is ready for operation. Operation Do not run pump dry, as permanent damage to the pump gears, seal, and bearings will result. Suction pressure should never be greater than the discharge pressure. 1. All pumps must be primed before start-up. Never operate a pump unless it is secured to a solid foundation. 2. Gear pumps are built to very close tolerances and this tolerance must not be altered. The liquids must, therefore, be free of all abrasives. Sand, silt, wettable powders, etc. must be avoided. NOTE: Cast iron pumps are for oil-based fluids only. 3. When pumping a more viscous (beyond 500 SSU) liquid, a slower speed, a larger pipe size pump, and possibly a larger motor should be selected. NOTE: See performance chart for Max. Torque. 4. Recheck motor rotation. Proper motor/pump rotation is clockwise (CW) looking at the motor shaft (See Figure 3). 5. On all models, the pressure relief valve is always on discharge side (See Figure 3). PRESSURE RELIEF VALVE 6. Standard model rotary gear pumps are supplied with a built-in pressure relief valve. The valve may be adjusted and used to set system operating pressure, or used as a system relief valve to prevent pump and motor damage that can occur when discharge line is closed off. This relief valve is not factory set. Extended operation (over one minute) under shut-off conditions could cause pump to overheat, leak, and damage itself. 7. To increase the relief valve pressure setting, remove protective cap, loosen lock nut, then turn the set screw (Figure 4 & 7, Ref. No. 18) in (clockwise). Turning the set screw out (counterclockwise) will reduce the pressure setting. When desired pressure is achieved, tighten lock nut and reinstall protective cap. 8. The pressure relief valve can be converted to an external relief. This will allow the relief to dump back to tank and allow longer periods of relief without pump damage. However, this is not a full-line relief valve, and in cases where frequent e...

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