Pompetravaini MCU Series, Инструкции по разборке и сборке, Страница: 7 / 20

Disassembly & assembly instructions single stage centrifugal pumps
TC… - MCU-… 7
6 - REPLACING THE PACKING RINGS
Replacement of the packing rings can be accomplished without disassembling the pump but proceeding as follows.
Remove the nuts on the packing gland studs VDMA 902.3, move the gland packing VDMA 452 as much as possible
toward the drive end. Remove with a suitable tool the old packing rings VDMA 461 and the lantern ring VDMA 458.
Clean the packing chamber and the shaft sleeve removing any encrustation, oxidation and deposits from the flushing
fluid.
Install the packing rings one by one and the lantern ring. Be sure to relocate the lantern ring in the original location and
the packing rings should be rotated so that the joints are 90°
apart.
Replace the seal gland with the associated adjusting nuts.
In the event the pump has been completely disassembled, it is recommended to fit the casing VDMA 161 with packing
rings VDMA 461, lantern ring VDMA 458 and gland packing VDMA 452, then this sub-assembly will be attached to the
pump frame. Be careful not to disturb the packing rings while inserting the shaft sleeve on to the shaft.
Alternatively, assembly first the pump and then the stuffing box as discussed above.
7 - SPARE PARTS
When ordering the pump it is good practice to also order the necessary spare parts, especially when there are no stand-
by pumps in the installation. This will minimise unnecessary down times in the event of pump failure or routine
maintenance. Following spare parts are suggested for each pump size:
1 Impeller
1 Wear ring
1 Shaft assembly
1 Set of bearings
1 Set of mechanical seals or packing
2 Sets of gaskets
However for proper parts management, consult the VDMA 24296 standard that recommends the quantity of spare parts
to be stocked in relation to the number of pumps installed.
On the pump nameplate are printed the pump model, the year of manufacture and the pump serial number: always
provide this information when requesting spare parts.
Specify also the VDMA number of the required part, as seen on the pump sectional drawing and parts list for proper
identification of spare parts.
We recommend the use of original spares: in case this is not respected, POMPETRAVAINI declines any responsability
for eventual damages caused by not original spare parts.