Grundfos CVM User Manual

English (GB)
9
7.2.2 Lubricating the pump
CVM pump bearings are water lubricated and do not require
grease.
Grease lubrication
In the standard configuration, CHM pumps on horizontal base
frames contain regreasable bearings and are packed with grease
at the factory before shipping. The bearing grease is good for one
year or 2000 hours of normal operation, whichever occurs first.
After this time, a regular grease schedule use an approved
grease and proceed as described below.
* Brand of grease used in factory
• Remove the drain plug, if any, and the filler plug. Add clean
lubricant until grease appears at the drain hole or along the
pump shaft. On pumps with drain hole, all old grease can be
purged. In such cases, the drain hole must be left unplugged
for several minutes during pump operation to allow excess
grease to be forced out.
• Lubricate the pump bearings at 1-3 month intervals,
depending on the severity of the environment.
7.3 Disassembling the pump
7.3.1 Preparations before disassembling the pump
Complete disassembly instructions are outlined below. Proceed
only as far as required to perform the maintenance work needed.
1. Switch off the power supply.
2. Drain the system.
3. Flush the system, if necessary.
4. For close-coupled pumps: Remove the motor fixation bolts.
7.3.2 Disassembling CVM pump
1. Disassemble the coupling guard (14).
2. Remove the coupling (13): Disassemble connected screws,
remove one half of the coupling, loosen the screw that
secures the washer (17), and then remove the other coupling
half.
3. Remove the annular key (18) and key (16B).
4. Disassemble the motor (15).
5. Disassemble balance-pipe units (8).
6. Disassemble the studs (22).
7. Remove the connection seat (19).
8. Remove the seal cap (12).
9. Remove the mechanical seal (11).
10. Remove the outlet stage (21).
11. Remove the balancing drum (9).
12. Remove the key and middle sleeve (2B).
13. Remove the impeller (5).
14. Remove the impeller key (16C).
15. Disassemble the middle stage (6), middle sleeve (2B) and
impeller (5).
16. Repeat steps 12-15 to disassemble the middle stage (6),
guide vane (7A), middle sleeve (2B), impeller (5) and impeller
key (16C) until all impellers are disassembled.
17. Pull out the shaft (1), and disassemble the bottom sleeve
(2A).
7.3.3 Disassembling CHM pump
1. Disassemble the balance-pipe units (8).
2. Remove the coupling (5).
3. Remove the key (f2).
4. Remove the bearing cover (a4).
5. Remove the round nut (a3).
6. Remove the bearing frame (a7), bearing (a8) and bearing
sleeve (a5) together.
7. Remove the slinger (a10).
8. Remove the seal cap (c2) and seal assembly (c1).
9. Remove the bearing cover (a17).
10. Remove the bearing frame (a21) and bearing (a19).
11. Remove the slinger (a20).
12. Remove the seal cap (c9) and seal assembly (c7).
13. Disassemble the studs (f5).
14. Remove the connection seat (a23).
15. Remove the inlet casing (b7).
16. Remove the middle sleeve (c4).
17. Remove the impeller (f7).
18. Disassemble the middle casing (d2).
19. Remove the guide vane (d1).
20. Repeat steps 16-19 to disassemble the middle casing (d2),
guide vane (d1), middle sleeve (c4), impeller (f7) and impeller
key (d3) until all impellers are disassembled.
21. Remove the shaft (f1).
22. Disassemble the balance hub (b4).
Approved grease lubricants
Manufacturer Lubricant
Kyodo Yushi* Multemp SRL*
Shell Dolium
®
R
Exxon Polyrex
®
Chevron
SRI Grease NLGI 2
Black Pearl - NLGI 2
Philips Polytac™
Texaco Polystar RB
Do not over-grease! Too much grease can cause
overheating and premature bearing failure.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
CAUTION
Toxic material
Minor or moderate personal injury
- Wash down the pump before doing any work on it.
DANGER
Hot, caustic, flammable or toxic materials,
including vapors
Death or serious personal injury
- Be extremely cautious when venting or draining
hazardous liquids.
Wear protective clothing when there are caustic,
corrosive, volatile, flammable, or hot liquids.
Do not breathe toxic vapors.
Do not allow sparks, open fire or hot surfaces near
the equipment.
To avoid leakage, make sure not to damage the seal
seat, mechanical seal head and O-ring during
disassembling the pump.

Grundfos CVM Specifications

General

Brand	Grundfos
Model	CVM
Category	Water Pump
Language	English