Installation Operation and Maintenance Manual

Maintenance (Continued)4. Repeat step 3 until the impeller becomes loose.5. Remove and discard the impeller O-ring (412A).You will insert a new O-ring during reassembly.412AFigure 17: O-ring for models 3196, HT 3196, NM 3196, 3198, and 3796If the impeller cannot be removed by the previous methods, cut the shaft between the gland and theframe, remove the impeller, stuffing-box cover, gland, sleeve, and shaft end as a unit. Do not apply heat.Seal-chamber cover removalSeal-chamber removal proceduresChoose from one of these procedures to remove the seal-chamber cover.Table 9: Procedures for seal-chamber cover removal by modelModelProcedure3196, CV 3196, HT 3196, LF 3196, 3796 Remove the seal-chamber cover.NM 3196, 3198Remove the seal-chamber cover and/or backplate.Remove the seal-chamber cover (3196, CV 3196, HT 3196, LF 3196, 3796)1. Remove the gland stud nuts (355).2. Remove the seal-chamber stud nuts (370H).3. Remove the seal chamber (184).184370H3552504. Remove the shaft sleeve (126) if it is used.The mechanical seal is attached to the sleeve.NOTICE: Be careful with the stationary portion of the mechanical seal that is either clampedbetween the backplate and the gland or seated in the seal-chamber bore. Failure to do so may result inequipment damage.Model 3796 i-FRAME Installation, Operation, and Maintenance Manual 73