Disassembly & assembly instructions single stage centrifugal pumps series TCHM & TCTM
4
Fill radial seal VDMA 421 with grease and press it in the bushing VDMA 542.
Place shaft VDMA 210 in a vice with the threaded end upward, slide the ball bearing VDMA 320 over the shaft until it rests
against the shaft shoulder and lock the bearing with snap ring VDMA 932. Do not to scratch the face of the radial seal ring.
Slide shaft with bearing in the lantern face VDMA 341, careful not to damage the radial seal ring, then install the snap ring
VDMA 932.1.
Place the motor vertically with the flange facing the top, place the pump shaft assembly on the motor flange guiding its
shaft to engage the hallow pump shaft VDMA 210, then tighten bolts VDMA 901. Motor shaft and the key must slide
precisely without being forced into the pump shaft.
Clean the seal cavity in cover VDMA 161 where the stationary seal part VDMA 433.2 will fit. Remove any incrustations,
oxidations and deposits created by the flushing fluid.
Lubricate seal cavity and seal O-Ring with oil compatible with the materials.
Press the stationary part of the mechanical seal in the cavity lining up the driving pin VDMA 562 if there is one.
When considering a new mechanical seal, different than the original, it is very important to compare the major working
dimensions with those of the original seal and the materials of construction must be compatible with the pumped liquid. It
is recommended to read the mechanical seal instructions if supplied with the seal. For further information and working
dimensions see tab. 1 in chapter 6 or contact Pompetravaini or the nearest representative.
Install the housing cover on the lantern face and tighten it with bolts VDMA 902.1.
The position should be so that the internal lubrication bore in the housing cover is pointing to the right hand and lined up
with the arrow on the lantern frame cast; in the event tapped holes for the pump foot are drilled on the lantern frame,
they should be directed downward.
Lubricate the seal rotating part and pump shaft with compatible oil, clean the seal faces with a soft non-abrasive tissue
and slide the seal rotating part over the shaft until it rests against the face of the stationary seal face. Seal must be
suitable for clockwise rotation unless it is a bi-directional type.
Slide and locate the seal locating ring in the original location which had been marked or at the measured location, then
tighten the two set screws.
To prevent seal damages and breakdowns it is recommended not to use excessive force when fitting the seals, their
components can be fragile
ONLY FOR TCHM
Slide impeller VDMA 230 over the shaft and lock it in place with impeller nut VDMA 925.
Place the gasket VDMA 400.1 on casing cover.
ONLY FOR TCTM
Place the proper gasket VDMA 400.1 on the casing cover and position casing spacer VDMA 110.
Slide impeller VDMA 230 over the shaft and lock it in place with impeller nut VDMA 925.
Place the gasket VDMA 400.1 on casing spacer.
Install pump casing VDMA 102; fix it in place with nuts and washers.
Pump casing should be positioned in such a way that, with the pump feet pointing downwards, the bore for internal
lubrication in the casing cover is positioned on the right.
Place the pump in the horizontal position and make sure it turns freely by hand.
Following the pump assembly it is recommended to hydrotest the pump to make sure there are no outward leakages.
The recommended pressure test should be at least 1,2 times the maximum working pressure but in any case not less
than 4 bar.
3 - 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 (only for TCHM)
1 Shaft
assembly
1 Ball
bearing
1 Mechanical
seals
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.