Disassembly And Assembly Of Ls Pumps; Dismantling The Pump - Grundfos LS 500-300-490E Installation And Operating Instructions Manual

6. Fill three or four circles of packing (31) to replace
the old one behind distribution ring (D30) and
stagger the joints 120° on each packing circle.
7. Install stuffing box gland (D33).
8. Lubricate the packing ring, ensure it can leak 40
to 60 drops per minute. Never over tighten
packing gland.
9. In suction lift systems, tighten the packing before
the pump starts. Loosen the packing immediately
after the pump starts and ensure it can leak 40 to
60 drops per minute.After a few hours of
operation, adjust the tightness based on the
leakage of packing.
32
11. Disassembly and assembly of LS
pumps

11.1 Dismantling the pump

1. Follow the steps in section Bearing, seal &
packing replacement to remove coupling (G1),
bearing cap (D18&D5), bearing housing (D4),
slinger (D9), seal cover (D1) (or packing gland
(D33)), seal housing (D2), mechanical shaft seal
(D3) (or packing ring (D31) and distribution ring
(D30) .
2. Remove all the bolts and nuts that holding casing
halves (A2 & A1) together.
3. Remove case roll pin, and then lift up upper case
(A2).
4. Place casing gasket and all the other gaskets in
water to keep them from drying out and shrinking.
5. Take out shaft assembly.
6. Slide wear ring (B3) off impeller (B1).
For the structure type 1 (see section Sectional
drawing, structure type 1):
• Remove lock nut (B5) with hook wrench.
• Mark on the impeller (B1) before removing it from
shaft (F1), make sure it can be installed identically
afterwards.
• Remove impeller (B1) from shaft (F1), and then
remove key (B2).
For the structure type 2 and 3 (see section
Sectional drawing, structure type 2 and structure
type 3):
• Loosen the set screws of shaft sleeves (B5), and
then remove sleeve nut (C1). Recommend to use
hook wrench during the procedure.
• Mark on the impeller (B1) before removing it from
shaft (F1), make sure it can be installed identically
afterwards.
• Remove impeller (B1) from shaft (F1), and then
remove key (B2).
For the structure type 4 (see section Sectional
drawing, structure type 4):
• Remove sleeve nut with hook wrench, and
remove seal sleeve (C6) and inner sleeve (B5).
• Mark on the impeller (B1) before removing it from
shaft (F1), make sure it can be installed identically
afterwards.
• Remove impeller (B1) from shaft (F1), and then
remove key (B2).