Multitech 1777.8/7-10 G3 Multitec, 7.3.6Dismantling the hydraulic system, 7.4Reassembly

Multitec

7.3.6Dismantling the hydraulic system

- Remove the bearings as described in sections 7.3.3.1 and

7.3.3.2and the shaft seals as described in sections 7.3.4 and 7.3.5.

If possible, place the hydraulic system in vertical position and start dismantling it from the discharge end.

-Undo the four tie bolts 905.

-Remove discharge casing 107, then dismantle the hydraulic elements.

Note: Pump versions A/B/C/D in material variants 22/23/30 have an intermediate bearing in the middle stage as of the number of stages given in the table (see fig. 36).

Pump size	32	50	65	100	125	150
No. of stages	8	7	6	6	5	6

Fig. 36 171.5 540.3 230.1

540.3Intermediate bearing - bush

171.5Intermediate bearing - diffuser

7.3.7Recommended spare parts stock for 2 years’ continuous operation

Caution We recommend to replace various wear parts, e.g. rolling element bearings, sealing elements,

circlips, etc.) whenever the hydraulic system has been completely dismantled.

Part No.	Description			Number of pumps
			(including stand-by pumps)
		2	3	4	5	6+7	8+9	10 and
								more
For shaft seal codes 65 and 66 (gland packing)
210	Shaft with small parts	1	1	2	2	2	3	30 %
230	Impeller (set = S)	1	1	1	2	2	3	30 %
231	Suction stage impeller	1	1	1	2	2	3	30 %
320.1	Fixed bearing (set)	1	1	2	2	3	4	50 %
320.2	Radial bearing	1	1	2	2	3	4	50 %
381	Bearing cartridge	1	1	2	2	3	4	50 %
411	V-ring (set)	4	8	8	8	9	12	150 %
412	O-ring (set = S)	4	8	8	8	9	12	150 %
461	Gland packing (set)	4	6	8	8	9	12	150 %
502 1)	Casing wear ring (set)	2	2	2	3	3	4	50 %
520	Sleeve	1	1	2	2	3	4	50 %
524	Shaft protecting sleeve	2	2	2	3	3	4	50 %
525	Spacer sleeve	2	2	2	3	3	4	50 %
529	Bearing sleeve	1	1	2	2	3	4	50 %
540	Bush	1	1	1	2	2	3	30 %
550.12)	Disc	2	2	2	3	3	4	50 %
59-4	Balance drum	1	1	1	2	2	3	30 %
For shaft seal codes 61, 62, 63 and 64 (with mechanical seal)
433	Mechanical seal (compl.) 3)	2	3	4	5	6	7	90 %
523	Shaft sleeve (set)	2	2	2	3	3	4	50 %
For oil lubrication
421 4)	Lip seal	4	8	8	8	9	12	150 %
423 4)	Labyrinth ring	2	3	4	5	6	7	90 %

1)pump sizes 125 and 150 only

2)pump sizes 32 to 100 only

3)parts 461 and 524 are not fitted

4)depending on pump version

Note: Please always indicate the works number stamped onto the pump name plate when ordering spare parts.

7.4Reassembly

Caution	The pump shall be reassembled in accordance
	with the rules of sound engineering practice.

-Under no circumstances use force.

-Due to their weight, some pump components must be supported during reassembly.

-Before reassembly, the locating surfaces of the individual components must be coated with a mounting aid in compliance with hygienic and safety regulations.

-The properties of new pump components must not be altered without prior consultation with our technical departments.

-The parts must be clean and free from shavings or dust.

-Reassembly is effected in reverse order to dismantling.

-The tightening torques indicated must be complied with. Avoid the use of mounting aids as far as possible. Should a mounting aid be required after all, use a commercially available contact adhesive, e.g. Pattex, Hylomar or Epple 33, after prior consultation with our technical departments. The adhesive shall only be applied at selected points and in thin layers. Do not use cyanoacrylate adhesives (quick-setting adhesives).

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