16
4.1.3 VM120,150,200
• Remove mechanical sea,refer to 3.1 dismantling.
• Remove screws (pos.12 no this step for power >45kw pumps)
• Remove nut and washer (pos.8, Ba, no this step for power: 545kw pumps).
• Remove bracket (pos.7)
• Remove nut and washer (pos.88a)
• Remove pump head(pos.3) by tapping at the edge of it.
• Remove cylinder (pos.55).
• Lift the diffuser stacks from inlet and outlet chamber(pos.26).
4.2 Assembly
• Reserve the steps of 4.1 to assemble pump body.
• Lubricate O-ring (pos.30) by edible oil or soap water.
• Direction of air vent nut(pos.36) shall be same with drain plug (pos.29) of inlet and outlet chamber (used
for VM1-20);
• Direction of air vent nut (pos.36) shall be same with the inlet of inlet and outlet chamber (used for
VM32-200)
• Tighten screws (pos.8) symmetrically by torque required in Table 2.
5. Diffuser stack for model
5.1 Dismantling and assembly of diffuser stack for model VM1,3,5
5.1.1 Dismantling
• Remove the diffuser stack. See 4.1 Dismantling
• Insert a suitable screwdriver in the shaft (pos.51) pin hole to prevent it turning. Remove nut (pos.23),
impeller washer (pos.24)
• Remove the diffuser stack components: impeller (pos.49), diffuser (pos. 4), bearing (pos.47a), impeller
sleeve(pos.47), support diffuser (pos.4a). See drawing 5-A, 5-B.
5.1.2 Assembly
• Reverse steps of 5.1 to assemble diffuser stack.
• Fit the components on the shaft. See drawing 5-A, 5-B Order of asse mbly for diffusers and impellers.
• Tighten the nuts (pas. 23) by the required torque as Table 2 indicated.
5.2 Dismantling and assembly of diffuser stack for model VM10, 15, 20
5.2.1 Dismantling
• Remove the diffuser stack. See 4.1 Dismantling
• Remove screw, washer (pos.65)
• Remove straps (pos.14), inducer (pos.5a)
• Insert a suitable screwdriver in the shaft (pos.51) pin hole to prevent it turning. Remove nut (pos.23),
impeller washer (pos.24)
• Remove the diffuser stack components: impeller (pos.49), diffuser (pos. 4), bearing (pos.47a), support
diffuser (pos.4a). See drawing 5-C, 5-D.
5.2.2 Assembly
• Reverse steps of 6.1 to assemble diffuser stack.
• Fit the components on the shaft. See drawing 5-C, 5-D
Order of assem bly for diffusers and impellers.
• Tighten the nuts (pos. 23) by the required torque as Table 2 indicated.
5.3 Dismantling and assembly of diffuser stack for VM32, 42, 65, 90
5.3.1 Dismantling
• Remove the diffuser stack.refer to 4.1 Dismantling.
• Remove screw and washer (pos.65).
• Remove straps (pos.14) inducer (pos.5a) and top diffuser (pos.50a)
• Remove impeller nut (pos.15), impeller sleeve (pos.16), impeller (pos.49, 49a), diffuser (pos.4), support
nut(pos.15), sleeve(pos.17), support diffu ser (pos.4a). Refer to Fig. 5-E, 5-F, 5-G and 5-H.
5.3.2 Assembly
• Reverse the steps of 5.3.1 to assemble diffuser stack.
• Fit the components by reffering to Fig. 5-E, 5-F, 5-G and 5-H.
• The position of the rst impeller and shaft can refer to Fig.3.
• Tighten the screws (pos.19a) by the torque required in Table 2 (on following pages).
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