Seal Chamber; Repairs; General; Changing The Impeller And Pump Unit - Homa FW-TP 4/1 Manuel D'instructions Original

Generally, the following applies when changing operat-
ing fluid: Turn off machine, allow it to cool, disconnect
from the power supply (to be carried out by a specialist!),
clean and place on a solid surface in a vertical position.
Warm or hot operating fluid may be under pressure.
The emergent operating fluid may cause burns. There-
fore, allow the machine to cool to ambient tempera-
ture first! Secure against tipping over and/or sliding!

6.4. Seal chamber

Since there is a large number of variants and versions of
these pumps, the exact location of the locking screws var-
ies depending on the pump part used.
• Carefully and slowly unscrew the sealing chamber's
filler screw.
Attention: The operating fluid may be under pressure!
• Unscrew drain screw. Drain the operating fluid and
collect in a suitable container. Clean the drain screw,
equip with a new seal ring and tighten again. To drain
fully, the machine must be tipped slightly to the side.
Ensure that the machine cannot tip over and/or slide
away!
• Place machine horizontally and fill with operating
fluid. Observe the prescribed operating fluid and fill
quantities.
• Clean the filler screw, equip with a new seal ring and
tighten again.

7. Repairs

7.1. General

The following repairs can be carried out on this machine:
•

Changing the impeller and pump unit

• Changing wear rings
When carrying out repair work, the following information
should always be noted:
• Round sealing rings as well as existing seals should
always be replaced.
• Screw fixings such as spring washers should always
be replaced.
• The correct torques must be observed.
In general, the following applies to repairs:
Switch off the machine, disconnect it from the mains
(have this done by an electrician), clean it and place
it on a solid base in a horizontal position. Secure it
from falling over and/or slipping.
If not otherwise stated, the torque values of the
below tables should be used. Values stated are for clean,
lubricated screws. Fixing torque [Nm] for screws A2/A4
(Coefficient of friction = 0,2)
A2/A4,
Hardeness class 70
DIN912/DIN933
M6 7 Nm
M8 17 Nm
M10 33 Nm
M12 57 Nm
M16 140 Nm
M20 273 Nm
7.2. Changing the impeller and pump unit
Changing the impeller and the pump unit.
• Loosen and remove the screws on the sealing
housing.
• Secure and remove the pump housing from the
sealing housing with suitable equipment, e.g.
hoisting gear. Place on a secure base.
• Fasten the impeller with suitable equipment, loosen
and remove the impeller fastening (cylindrical screw
with socket hex).
Pay attention to the locking screw!
• Remove the impeller from the shaft using a suitable
extractor.
• Cleaning the shaft
• Attach a new impeller to the shaft.
A2/A4,
Hardeness class 80
DIN912/DIN933
11,8 Nm
28,7 Nm
58 Nm
100 Nm
245 Nm
494 Nm
EngliSH | 35