Pompetravaini MCU Series, Инструкции по разборке и сборке, Страница: 5 / 20

Disassembly & assembly instructions single stage centrifugal pumps
TC… - MCU-… 5
4 - DISASSEMBLY AND ASSEMBLY OF PUMPS SERIES
TCD and MCU-OD
4.1 - DISASSEMBLY
(See the section drawings of fig. 15 and 16 of chapter 8).
Drain the oil from the bearing frame by removing the drain plug VDMA 903.4.
Remove the bolts from the studs VDMA 902.2 so that the rotor may be removed from the pump.
Remove the impeller nut VDMA 922 (for Cast Iron construction) or VDMA 925 and 922 (for Stainless Steel construction)
and remove impeller VDMA 230 from the shaft VDMA 210, remove key VDMA 940.2. Remove screws VDMA 900.1 and
cooling plate VDMA 167.
Remove the screws VDMA 901.1 or, for /SP construction, the bolts from studs VDMA 902.1.
Remove the casing cover VDMA 163, loosen the set screws on the rotating element of the mechanical seal, remove
both elements of the mechanical seal. For the /SP design remove also the reducing flange VDMA 184.
To completely disassemble the bearing frame proceed as described below.
With a gear puller remove the half coupling from the pump shaft and the key VDMA 940.
Remove screws VDMA 901 and bearing cover VDMA 360.
Remove the retaining rings VDMA 932.3, push the shaft VDMA 210 out toward the free end, together with the bearing
VDMA 320.1. Remove the snap ring VDMA 932 and the bearing VDMA 320.1.
4.2 - ASSEMBLY
For assembly procedures see paragraph 2.2 in combination with the tab. 1 below that contains the specific components
dimensions pertaining this pump series only.
Tab. 1 - Pumps series
TCD - MCU-OD and /SP
PUMP MODEL BEARINGS TYPE
SHAFT SEAL RINGS
TYPE
MECHANICAL
SEAL
Ø (mm)
OIL
KG.
25 - 32 - 40 - 50 - 65/ 125
Seal side
N°1 6206 C3
(30x62x16)
Drive side
N°1 6305 C3
(25x62x17)
N°1 AS25357
(25x35x7)
Ø30 0,20 25 - 32 - 40 - 50 - 65 - 80 / 160
25 - 32 - 40 - 50 / 200
65 - 80 - 100 / 200
N°2 6308 C3
(40x90x23)
N°1 AS35477
(35x47x7)
Ø40 0,40
40 - 50 - 65 - 80 / 250
5 - MECHANICAL SEALS ASSEMBLY
5.1 - Pumps series TCH - TCT - TCA - MCU-CH - MCU-CHT - MCU-CHA
NOTE: Where available, read the specific instructions of the used mechanical seal as well as the following
information.
Mechanical seal different than the one originally fitted in the pump may be used. Note however, that the primary
dimensions must be the same and the material of construction must be suitable with the liquid handled. For more
information and the assembly dimensions pls contact POMPETRAVAINI or its closest representative.
Clean the stationary seal element removing encrustation, oxidation and deposit of the flushing liquid. Lubricate the seat
and the elastomers of the stationary seat with oil that is compatible with the seal elastomers. Push the prepared seal
stationary seat in the seal cover VDMA 471 or casing cover VDMA 161, be sure to centre the anti-rotating pin is
installed.
Pumps fitted with double mechanical seals will have the outboard (drive end) installed as above, while the internal seal
(impeller side) will have the stationery seat fitted in the casing cover VDMA 161 for the case of double back to back
seals, or in the seal retainer VDMA 542 in the case of double seals in series (tandem).
Clean the shaft sleeve VDMA 524 with extra fine emery cloth. Cleaning strokes should be axially.
Install the seal locating ring VDMA 485, if previously removed, in the original location. If the mechanical seal is fitted with
set screws on its collar the seal locating ring VDMA 485 may not be present.
CAUTION! The position of the seal locating ring will vary with the seal working length.
In the event the new mechanical seal has a working length different than the original seal, it will be required
to relocate the seal locating ring accordingly.
Lubricate with compatible oil the sleeve and the elastomers of the seal rotating element.
Push the seal rotating element on the sleeve helping with a rotating motion until it rests against the locating ring VDMA
485. Tighten set screws if fitted in the mechanical seal.
For pumps having double mechanical seals back to back, the above procedure apply for both seal rotating elements.
Should the mechanical seals be with conical single spring pay particular attention to their rotation direction.
Pumps fitted with double mechanical seals in series (tandem), will require fitting the rotating seal element impeller side
(inside seal), followed by the seal insert VDMA 542 with the stationary seal face element, locate the snap ring VDMA
932.1 on the sleeve VDMA 524 and fit the rotating element of the external mechanical seal. After these assembly steps,