ProMinent Makro TZ Operating Instructions Manual page 38

Repair
Positioning liquid end
Commissioning packing
collars Packing collars should not prevent feed chemical from leaking. Leakage is necessary to reduce
Feed
chemical-
pressure
Feed chemical-
pressure
Page 38
Place the liquid end onto the power end flange and screw in place (tightening torque 25 Nm)
Grease the front end surfaces of the jointed head and the fork head
Line up the holes of the coupling head and the fork head (see Fig. 22)
Push bolt through the holes and insert safety collar into the bolt
Clamp the protective cover above the turret bolt
(Where applicable: attach leakage or flushing hoses to the hose nozzles)
friction and to draw off the heat produced by friction.
The figure shows the feed chemical passing through the packing ring from the left (drips to the
right.). The right-hand arrow represents the tensioning screw pressure.
Packing collar
Fig. 28 Piston
Commissioning
Allow pump to run for the first 10–15 min with a leakage of 50–200 drops/min.
Then:
1. Stop the pump
2. Remove protective cover
3. Carefully tighten tensioning screw
4. Clamp the protective cover over the turret bolt
5. Start the pump
6. Check the leakage
Repeat steps 1-6 until the minimum leakage is achieved (10 and 120 drops/min.).
(Depends on the feed chemical, the pressure of the chemical, the temperature and the piston
speed.)
NOTICE
Do not over-tighten the tensioning screw.
If it is too tight, the system might run dry which would cause damage to the piston and the
packing collars.
Result of over-tightened tensioning screw:
The feed chemical can no longer penetrate through the packing collars – the liquid lubrication is
suppressed. The piston is not lubricated. The packing collars will burn and the piston will be
damaged. Leakage will increase sharply.
Packing collar
Fig. 29 Piston
Tensioning screw-
pressure
Tensioning screw-
pressure
ProMinent ®