Wilo Atmos TERA-SCH Installation And Operating Instructions Manual page 37

9.5.3 Dismantling the rotating element
Installation and operating instructions Wilo-Atmos TERA-SCH
Maintenance/repair
NOTICE
Avoid damage to the impeller during removal!
If the impeller is too tight, carefully heat the impeller shrouds uniformly inwards to-
wards the hub.
Identical steps for all pump types
ƒ
Remove the coupling screws/nuts of the coupling.
ƒ
Remove the bolts (1) of the bearing housings (2, 33).
ƒ
Lift the rotating element.
ƒ
Remove the coupling.
ƒ
Remove bearing housings of both drive end (2) and non-drive end (33).
ƒ
Remove both drive end and non-drive end bearings (3) using a puller. Never try to
extract the bearing by applying force to the outer race!
ƒ
Remove supporting ring (4) from the non-drive end of the shaft (24).
ƒ
Remove water throwers (6) from both sides of the shaft (24).
Further steps for gland pack version
ƒ
Remove bolts (40) for the gland covers (37).
ƒ
Remove gland cover (37) and gland (38) from the shaft along with logging ring (39).
ƒ
Unscrew and remove the sleeve nuts (36) on both sides.
ƒ
Carefully extract o-ring (35) from the sleeve (34) with a suitable tool without dam-
aging it.
ƒ
Remove the wear rings (25) from the impeller (21).
ƒ
Clean the shaft to make it ready for removal of the sleeves.
ƒ
To remove the sleeves effortlessly, apply some molly cream or grease on the shaft
and slide the sleeves over it
ƒ
Mark the position of impeller (21) on the shaft (22) to ease the reposition it while
reassembling!
ƒ
Remove the impeller (21) carefully. Avoid damage to the impeller key (14)!
Further steps for mechanical seal version with sleeves
ƒ
Remove bolts (28) for the mechanical seal cover (7).
ƒ
Slide out the mechanical seal cover (7) carefully over the shaft (22).
ƒ
To ease the positioning while reassembling, mark the position of mechanical seal (9)
on the shaft (22).
ƒ
Pull the mechanical seal (9) carefully over the shaft.
ƒ
Remove the abutment ring (10).
ƒ
Unscrew and remove the sleeve nuts (36) on both sides.
ƒ
Carefully extract o-ring (35) from the sleeve (34) with a suitable tool without dam-
aging it.
ƒ
Remove the wear rings (25) from the impeller (21).
ƒ
Clean the shaft to make it ready for removal of the sleeves.
ƒ
To remove the sleeves effortlessly, apply some molly cream or grease on the shaft
and slide the sleeves over it
ƒ
Mark the position of impeller (21) on the shaft (22) to ease the reposition it while
reassembling!
ƒ
Remove the impeller (21) carefully. Avoid damage to the impeller key (14)!
Further steps for mechanical seal version without sleeves
ƒ
Remove bolts (28) for the mechanical seal cover (7).
ƒ
Slide out the mechanical seal cover (7) carefully over the shaft (22).
ƒ
To ease the positioning while reassembling, mark the position of mechanical seal (9)
on the shaft (22).
ƒ
Pull the mechanical seal (9) carefully over the shaft.
ƒ
Remove the abutment ring (10).
ƒ
Remove the wear rings (25) from the impeller (21).
ƒ
Mark the position of impeller (21) on the shaft (22) to ease the reposition it while
reassembling!
ƒ
Remove the impeller (21) carefully. Avoid damage to the impeller key (14)!
en
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