Pompetravaini MCU Series, Disassembly & Assembly Instructions, Page: 6 / 20

Disassembly & assembly instructions single stage centrifugal pumps
TC… - MCU-… 6
install the seal cover VDMA 471 on the shaft, the cooling cover VDMA 165 with the studs in place, then all the required
gaskets and the pre-assembled shaft sleeve.
Prior to finalise the mechanical seal assembly, already fitted on the shaft sleeve, it is recommended to clean both seal
faces with a clean and soft tissue. Finally proceed with the assembly of the complete pump avoiding stress on the seal
assembly which could damage the fragile components of the mechanical seal.
“CARTRIDGE” TYPE MECHANICAL SEALS
These type of seals are easy to install because they are pre-assembled on a seal sleeve.
To install the “cartridge” simply slide the assembly over the shaft sleeve or the shaft itself depending upon the design,
paying particular attention not to damage the seal O-Ring.
Complete the pump assembly, lock the cartridge flange with the studs, lock the set screws of the seal sleeve on to the
shaft or shaft sleeve, remove the sleeve/cartridge spacers that have allowed the correct location of the total seal
assembly.
5.2 - Pumps series TCD - TCD/SP - MCU-OD - MCU-OD/SP
Clean the stationary seal element of any encrustations, oxidation or residues from the handled liquid.
Lubricate the seal cavity and the elastomers with a compatible light oil.
Place the bearing frame VDMA 330 in the vertical position with the shaft drive end at the bottom, (in the case of pump /SP
the bearing frame should have attached the extension flange VDMA 184), install the seal stationary element with the
pertaining O-Rings, the lapped seal face should be at the top, clean the seal face with a soft tissue.
Lubricate the shaft and the Viton booth of the seal rotating element. Clean seal face with a soft tissue and slide the
rotating seal element on to the shaft VDMA 210 with the carbon face to the bottom.
Pumps of the Group 1, position the seal rotating element 84.5 mm from the shaft shoulder (against which the impeller
VDMA 230 will rest), pumps of the Group 2 this distance should be 109 mm, tighten the set screws to lock the seal to
the shaft (see fig. 1).
Place the O-Rings required and install the casing cover VDMA 163 on the bearing frame VDMA 330 (on the extension
VDMA 184 for pump design /SP). Tighten the 4 bolts or studs and proceed then with assembling the balance of the
pump.
Fig. 1
330
184 330
163 210
84,5/109
TCD
MCU-OD
TCD/SP
MCU-OD/SP
433.2