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No 10) and replace with a new seal assembly. Refer to INSPECTION procedures below. 5. Remove the seal assembly spring and metal seat. 6. Remove external retaining ring (Ref. No. 9) from the shaft (Ref. No. 5) using external snap-ring pliers (21.2” legs). 7. Remove the gear assembly and drive shaft (Ref. No. 4 & 5). Pump Inspection Inspect components for signs of excessive wear. Excessive wear of the pump will usually show up as degradation of performance. This can be seen by the flow dropping off under pressure, excessive noise and/or excessive wear inside the pump. Gear pump components are precision fit. When the gears are worn, so is the body, shafts, bushings or shaft pockets and housing. At that point, the pump head should be replaced. 8. Assemble the pump in reverse order of disassembly. Tighten cover screws (Ref. No. 3) in opposing sequence. As the cover (Ref. No. 2) is incrementally tightened, the shaft (Ref. No. 5) should be periodically turned. This ensures cover-to-body alignment and prevents binding of shaft. 9. Assemble pump to motor. (See Assembly 3 through 5.) 10. All pumps must be primed before start-up and the seal chamber needs to be filled. 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. Figure 6 - Mechanical Seal Replacement Mechanical Seal Replacement (Refer to Figures 6 & 7 for parts identification.) 1. Remove pump from motor, if not already done. 2. Remove snap ring (Ref. No. 12). Pry out seal seat (Ref. No. 11). Pull mechanical seal (Ref. No. 10) off shaft. (See Assembly 3 through 5.) 3. Reinstall new mechanical seal (Ref. No. 10) on drive shaft using water as a lubricant. Do not push on carbon face of new mechanical seal. Push with a hallowed out wood dowel or piece of cardboard. 4. Install seal seat (Ref. No. 11), with water as a lubricant, on the O-ring with shiny white ceramic face facing the carbon seal (Ref. No. 10) without touching either of the seal faces. Scratching the seal faces will cause the seal to leak. Using anything other than water as a lubricant, when installing seal and seat, may cause seal to leak. NOTE: The carbon and ceramic seal faces spin against each other providing for the functional seal. The seal ceramic seat o-ring is not the functional seal, but its purpose is to hold the seal ceramic seat in place. 5. Reinstall the snap ring (Ref. No. 12). Relief Valve Disassembly and Assembly (Refer to Figure 7 for parts identification.) 1. Standard models are equipped with a pressure relief valve. Remove the relief valve cap (Ref. No. 15) and O-ring (Ref. No. 19). 2. Remove the spring (Ref. No. 22) and piston (Ref. No. 23). A worn or broken relief valve is a sign of excessive pump wear. The pump head should be replaced. 3. Assemble the relief valve in reverse order. Form L-4083 (1/06) 9 Contact a Shertech Distributor Distributors can be found at or (The factory only sells pumps and parts to distributors.) Please provide following information: -Model number -Serial number (if any) -Part description and number as shown in parts list Figure 7 - Repair Parts Illustration NOTE: Seals and the coupling components can be replaced. If the performance or function of the pump is impaired due to wear or other causes, it is strongly advised that the pump head be replaced. Note that seals and o-rings used in each material type are interchangeable. The Viton components from the cast iron models can be used in the bronze, and the Buna in the bronze models can be used in the cast iron models. Shertech Opera...

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