IMO ACG, UCG 7 Maintenance And Service Instructions

Screw pumps

ACG/UCG 7

This instruction is valid for all ACG/UCG pump models shown on page 2
Contents Page

List of components 2
Exploded view/Ordering code 3
Service intervals 4
Shaft seal/Service for ball bearing 4
Lubricating intervals/Useful tools 5
Inspection of rotors 5
Sectional view 6
Dismantling 7
Reassembly 9
Pressure relief valve 11

ACG1 ' IMO AB

ACG 0621GB

October 2002

A Member of the
COLFAX PUMP GROUP

Maintenance and Service
Instruction

2 ACG 0621GB

October 2002

IMO AB, Telephone: + 46 8 50 622 800, Telefax: + 46 8 645 15 09

E-mail: [e-mail]

Qty Components included in Spare parts sets:

PosNo Denomination G011 G012 G050 G053 G054 G057 G070 Note

1010 Power rotor CCW-rot. 1 x (x)
1020 Power rotor CW-rot. 1 x x
106 Balancing piston 1 x x x 5
113 Shaft key 1 x x x
120 Distance sleeve 1
122 Ball bearing 1 x x
124 Retaining ring 1 x x x
124A Support ring 1 x x x
201 Idler rotor CCW-rot. 2 x (x)
202 Idler rotor CW-rot. 2 x x
359 Distance washer 1
359A Support ring 1 x x x
401 Pump body 1
424 Sleeve 1 4
424A Washer 1 4
429 Spindle 1 4
437 O-ring 1 4
440 Return valve 1
451 Screw 4/6
453 Screw 4
462 Plug 2 1
462A Sealing washer 2 x x x 1
473 Grease nipple 1
473A Grease nipple cover 1
480 Valve housing 1 2
5010 Front cover 1
502 Tension pin 1 6
502A Plug 1 6
506 Gasket 1 x x x
509 Shaft seal 1 x x x
514 Retaining ring 1 x x x
537 Plug 2
537A Sealing washer 2 x x x
551 Rear cover 1 3
556 Gasket 1 x x x
601 Valve cover 1 x 2,7
602 Sealing washer 1 x xxx2
605 O-ring 1 x xxx2
608 Valve spindle 1 x 2,7
608A Retaining ring 1 x xxx2
612 Set screw 1 x 2,7
614 Valve piston 1 x 2,7
615 Valve spring 1 x 2

Before commencing any work, read this instruction carefully! Failure to comply
with these instructions may cause damage and personal injury!

Valid for all pumps in sizes: ACG/UCG 045/052/060/070; Rotor diameter and generation: K7/N7
With version codes: Also valid for pump options: A101, A327, A385

Example of pump designations
std: ACG 045N7 NVBP; option ACG 070N7 NVBP A101

List of components

For more information about the pumps identification code, technical data and performance we refer to the
ACG/UCG Product description. Fore more information about the pumps installation, Start-up and trouble
shooting we refer to the IMO Installation and Start-up instruction for low pressure pumps.

Explanations:

G011: Rotor set
CCW-rotation option

G012: Rotor set
CW-rotation (std)

G050: Shaft seal
G053: Minor kit

(G050 + G057) + 122
G054: Major kit consisting

of: G053+G012 (G011)
G057: Joint kit
G070: Valve element

ACG Pump with DIN
flanges

UCG Pump with ANSI
flanges

A101: CCW
A327: With Tuning
A385: CCW and Tuning

Name plate of the pump

IMO AB

ACG2 ' IMO AB

N

T
VBF

E
P
G

!

Notes:

1) Excluded in xxxG

2) Excluded in xxxE

3) Valid for xxxE

4) Valid for pump option
A327

5) Included in item 1020
or 1010

6) Included in item 5010

7) Only sold as G070

3

ACG 0621GB
October 2002

IMO AB, Telephone: + 46 8 50 622 800, Telefax: + 46 8 645 15 09

E-mail: [e-mail]

ACG3 © IMO AB

473

537
537A

506

401

556

480

551

453

462

462A

462

537
537A

473A

1010

201

608A
601
602
605
608
612
615

614

453
480

1020

202

113

113

509

359

359A

514

202

124A
124

122 120

451

5010

453

462

462A

462

Fig. 1

Exploded view

CCW rotation (non-standard)

xxxP

xxxG

CW rotation

Ordering code

Recommendation:

For maintenance the
following spare part
sets are recommen­ded:

Set: To be used:

G057 Joint kit

For dismantling of
the pump

G053 Minor kit

For service

G054 Major kit

For repair after
damage or greater
wear.

Pos Spare parts sets Part numbers, sizes
No 045 052 060 070

Rotor set CW-rotation (std):

G012 Normal lead - pump version N7 178913 179507 179515 179523
" Low lead - pump version K7 187542 187559 187567 187575

Rotor set CCW-rotation (non-std):

G011 Normal lead - version N7 186478 186486 186494 186502

Low lead - version K7 189641 189642 189643 189644

G050 Complete shaft seal - version code xVxx 190335 190336 190338 190340
” ” - version code xTxx 174094 174102 174110 174128

G053 Minor kit - version code xVxx 191241 191243 191245 191247
” ” - version code xTxx 191242 191244 191246 191248

G054 Major kit=G012(G011)+G053 - - - ­G057 Joint kit 191237 191238 191239 191240
G070 Valve element - version code xxxP/G 191250 191250 191251 191251
122 Ballbearing 078576 077461 191181 191182

Details in pump option A327
See the sectional view p. 6

Fig. 2

Version xTxx

Ordering example:

For IMO-pump ACG 045N7
NVBP, serial number 456789
Shaft seal
pos G050 p/n 190335
Ballbearing
pos 122 p/n 078576

xxxE

ACG/UCG xxBE/BP/BG

Version xVxx

4 ACG 0621GB

October 2002

IMO AB, Telephone: + 46 8 50 622 800, Telefax: + 46 8 645 15 09

E-mail: [e-mail]

Service intervals

The intervals for inspection and replacement of wear
parts vary greatly with the properties of the pumped
liquid and can only be determined by experience.
All internal parts of the ACG-pump are lubricated
by the pumped liquid. Pumping liquid which
contains abrasive materials, or liquid that is corro­sive, will significantly reduce service life
and call for shorter service intervals.
Wear in the pump may be indicated by:

• Vibration

• Noise

• Loss of capacity

• Reduction in flow/pressure

• Leakage
In installations where unplanned shut downs must

be avoided, it is advisable to have a complete pump
available for replacement, should any malfunction
occur. Furthermore we recommend planned inspec­tion and overhaul at regular intervals, not exceeding
3 years.
It is recommended always to have the spares in­cluded in minor spare part kit available.

Service for ball bearing

The ACG-pump is fitted with an external grease
lubricated ball bearing.
When delivered from IMO AB, the ball bearings in
pump version xVxx are filled with grease of type B.
For version xTxx, type C is used.
Whenever the ball bearing is removed, it is recom­mended to exchange it for a new one.
Fit the new ball bearing properly greased and
regrease it after one hour of running, while the
pump is operating.

Inspection of shaft seal

As the seal faces of a mechanical shaft seal are
lubricated by the fluid a certain leakage will always
be present. Ten drops per hour can be considered as
acceptable.
An external visual inspection of the pump is advis­able at least every two days to assure that the shaft
seal is not leaking too much.
Excessively leaking shaft seals should be changed
without delay, as the leakage normally will grow
worse and cause additional damage.
Follow the instructions in the dismantling/reassem­bly session.
When working with a shaft seal, cleanliness is of
utmost importance. Avoid touching the seal faces. If
necessary, the seal faces should be cleaned immedi­ately prior to assembly, using a dustfree cloth and
clean solvent.
Never use grease on the seal faces.

Shaft seal-assembly drawing

Shaft seal G050 (pos 509)

Version code xVxx

Version code xTxx

S2 S1 S5

S2 S1 S4 S6 S9 S7 S5

S1 Seat
S2 O-ring
S4 Seal ring
S5 Seal ring carrier
S6 O-ring
S7 Spring
S9 Stop washer

S1 Seat
S2 O-ring
S5 Bellows unit

Fig. 3

ATTENTION

Be careful to mount
these parts in right
order and in right
direction.

If the pumps operating temperature exceeds
60°C let the pump cool off before any
service, maintenance or dismantling work is
commenced to avoid burn injury.

All work carried out on the pump has to be
performed in such a manner that risks for
personal injury are observed!

Use an appropriate type of grease, as per table and a
grease gun suitable for grease nipple (pos 473)
according to DIN 71 412 (ISO 6392).
On vertical mounted units the greasing intervals are
reduced to half.
Installed in dusty or dirty premises or in a corrosive
environment it should be lubricated at more fre­quent intervals.
If using others than these recommended greases
check if it is possible to mix them with each other,
otherwise clean before using a new grease.

Connecting and disconnecting of electric
cables must be done only by personnel
authorized to do such work.

ACG8 ' IMO AB

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