Installation Operation and Maintenance Manual

Maintenance (Continued)c) Install the shaft sleeve (126).126412A1012. Mark the shaft and sleeve at the face of the seal chamber.3. Continue the complete reassembly of the pump, except for the mechanical seal.4. Set the impeller clearance.Refer to the Impeller Clearance Setting section for more information.5. Scribe a line on the marked shaft and sleeve at the face of the seal chamber.6. Remove the casing, the impeller, and the seal chamber.7. Slide the gland, with the stationary seat and gland gasket installed, onto the shaft until it contacts theinboard labyrinth oil seal.8. Install the mechanical-seal rotary unit according to the manufacturer's instructions.Use the scribed line and the seal-reference dimension.9. Reinstall the seal chamber.10. Slide the gland on the seal-chamber studs and secure them with the gland nuts.Tighten the nuts evenly so that the gland is seated on the seal-chamber pilot and is perpendicular tothe shaft.11. Complete the reassembly of the pump.Seal the shaft with a conventional outside-component mechanical sealWARNING:The mechanical seal used in an Ex-classified environment must be properly certified. Prior to startup,make sure that all areas that could leak pumped fluid to the work environment are closed.NOTICE:The mechanical seal must have an appropriate seal-flush system. Otherwise, excess heat generation andseal failure can occur.1. Assemble the seal chamber.a) Install the seal-chamber cover or backplate (184) and fasten with nuts (370H).104 Model 3796 i-FRAME Installation, Operation, and Maintenance Manual