the contact surfaces with lubricant to easy assembly and help prevent contact corrosion.
- Driving side: Heat angular ball bearing (320.02) in oil bath up to 80 oC, push it onto shaft in X-arrangement (install bearings with the outer ring stamped outside). Do not forget spacer ring (504.07) between the bearings. Apply pressure to inner race only. Check if bearing is flush against the shaft shoulder at all points.
In case of renewed angular ball bearings: Use only paired bearings. Never replace only one bearing of a unit. The bearing design number is given in the pump parts list.
- Install bearing nut (923.01 self-securing, left-threaded)and apply lubricant to the contact surface.
Do not overtighten bearing nut.
- Non-driving side: Heat inner race of antifriction bearing (320.01) in oil bath up to about 80°C and push up to shaft stop.
- Insert oil ring (644.01) through outboard bearing bore and hang by wire through air filter (see sketch 7.6-1). - Insert circlips (932.01) into the groove of the bearing bracket bores. Build in outer race of antifriction bearing
with rolling elements on impeller side. Build in ring (500.13) with springs (478.02) on coupling side (glue springs with grease into their bores).
- Slide pre-assembled shaft with bearings into the bearing bracket (330...) passing through hanging oil ring. Carefully insert shaft with radial bearing inner race into radial roller element. It will be necessary to lightly tap the shaft and bearings into the bearing bracket with soft hammer. Apply pressure to outer race only. Rotate shaft between taps.
ATTENTION ATTENTION ATTENTION X-arrangement stamped Sketch 7.6-1 wire
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- If previsaged (see sectional drawing of pump) push the lip-ring(s) (420...) onto shaft prior to assembly of the bearing covers.
- Spread oil-proof sealing mastic onto sealing faces of the inboard bearing cover (360...) and fasten with hexagon head screws (901.01/901.02 or 901.04) at bearing bracket. Tighten evenly and crosswise.
- Insert springs (478.02) into the bores on coupling side bearing cover (360...). Spread oil-proof sealing mastic onto sealing face and mount bearing cover. Lube treads and support surfaces of hexagon head screws (901...), screw on and tighten fasteners evenly and crosswise. Use torque wrench, tightening torque 60 Nm. - Slide inboard and outboard deflectors (507.01 and 507.02) onto shaft. Adjust gap between deflector and
bearing cover to 1 mm and tighten grub screw (904...).
- In case of fan cooling: Insert key (940.04) for fan (831.01) into shaft, slide on fan and place circlip (932.02) in shaft groove. Place fan cover (832.01) and fasten with cylindrical screws (900.06).
- Insert key (940.01) for impeller and shaft sleeve into shaft.
Assembly of shaft seal
Assembly of soft packing
- Push gland (452...) and shaft protection sleeve (524.01) onto shaft, if existing also lantern ring (458.01). - Fit O-ring seals (412.01 and 412.02) into casing cover (161.01) grooves. Push casing cover with inserted
neck bush (456.01) or packing bush (457.01) into the centering of the bearing bracket flange. Tighten bearing bracket fastening nuts (920.02) evenly and crosswise.
- Push impeller (230.01) onto shaft, ensuring that gasket (400.03) between impeller and shaft sleeve is correctly located. Screw on impeller nut (922.01) with gasket (400.03) and tighten only by hand.
- Fit packing rings (461.01) (see also 7.2), tighten gland (452.01) with hexagonal nuts (920.02) and loosen again, applying it only hand-tight for operation. Check shaft rotation.
Assembly of standard type mechanical seal (refer to shaft seal drawing)
- Build stationary parts of mechanical seal into mechanical seal cover, insert auxiliary sealing components as far as existing and push pre-assembled mechanical seal cover onto shaft.
- Mount rotating parts of mechanical seal onto shaft sleeve. If a seal ring exists, place it in the groove of the shaft sleeve bore and push shaft sleeve together with pre-assembled unit of mechanical seal onto shaft. - Fit O-ring seals (412.01 and 412.02) into casing cover (161.01) grooves. Push casing cover cautiously over
the mechanical seal parts into the centering of the bearing bracket flange and screw by inserting and fastening also the mechanical seal cover. Ti ghten bearing bracket fastening nuts (920.02) and mechanical seal cover fasteners (920...) evenly and crosswise.
Double seal (back-to-back or tandem configuration) Pre-assemble the stationary components of the internal
mechanical seal in the casing cover prior to assembly of the casing cover (161.01) (shaft sealing casing) (see section drawing of the mechanical seal).
- Push impeller (230.01) onto shaft, ensuring that gasket (400.03) between impeller and shaft sleeve is correctly located. Screw on impeller nut (922.01) with gasket (400.03) and tighten only by hand.
Assembly of Cartridge type mechanical seal(refer to shaft seal drawing)
- Mount rotating parts of mechanical seal onto shaft sleeve. If a sealing ring exists place it in the groove of the shaft sleeve bore.
- Build in stationary elements of the mechanical seals into the mechanical seal cover(s) and push over shaft sleeve. Pre-stress the springs of the mechanical seal by pressing on the mechanical seal cover until the assembly bars can be moved into the shaft sleeve groove.
- Push complete pre-assembled mechanical seal (Cartridge) into the casing cover (161.01) bore (shaft seal chamber) and tighten fastening nuts evenly and crosswise.
- Fit O-ring seals (412.01 and 412.02) into casing cover (161.01) grooves. Slide casing cover (161.01) with built-in mechanical seal cartridge onto shaft cautiously (pay attention to key). Push casing cover into the centering of the bearing bracket flange. Screw on fastening nuts (920.02) only in a loose way.
To avoid any damage to the mechanical seal components please keep strictly to the sequence of the following procedure
- Push impeller (230.01) onto shaft, ensuring that gasket (400.03) between impeller and shaft sleeve is correctly located. Screw on impeller nut (922.01) with gasket (400.03) and tighten only by hand.
- Before tightening the impeller nut (922.01) and the bearing bracket fastening (920.02) do by all means loosen the assembly bars of the mechanical seal cartridge at the seal cover, draw them out of the shaft sleeve
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groove and reattach them. Tighten fastening nuts (920.02, casing cover / bearing bracket) evenly and crosswise.
Tighten impeller nut
- If present: Fit gasket (400...) on the impeller nut shoulder.
- Lock pump shaft (see also sketch 7.4-2) and tighten impeller nut with torque wrench. Tightening torque see table below.Note:The impeller nut has a right-handed thread to tighten against rotation (tighten clockwise). In case the impeller nut is provided with an additional hexagon head screw (901.10). Fit gasket (400...), screw on hexagon head screw and tighten with torque wrench.
Tightening torque in Nm for impeller fastening
Bearing bracket size 6 7 8
Impeller nut (922.01) 1200 1900 3000
Securing screw (901.10) 40 100 190 Torque only valid if thread and nut support surface is greased or oiled. Bearing bracket size = first digit of the second number of type denomination (e.g. Z . 200 - 6 560 = bearing bracket size 6)
- A "Heli-Coil-Mid-Grip" thread insert serves for the securing of the impeller fastening. The automatic lock of the thread insert weakens after about 5-10 assemblies and the thread insert should then be replaced. For the assembly/disassembly special tools are required, to be requested on demand.