PFT G4 - Troubleshooting work

Mixing Pump PFT G4
Troubleshooting
60 2007-09-05
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7.4 Troubleshooting work
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7.4.1 Eliminating hose blockage
 To be performed by a service technician only.
 Additionally required protective equipment:
z Face protection
Fig. 59: Switching off cellular wheel motor
DANGER! Injury hazard through spraying mortar! When
loosening blocked hoses mortar can escape under high
pressure and cause severe eye injures or injuries to other
parts of the body. Use face protection equipment when
opening parts that are under pressure.
1. Switch off the cellular wheel motor (Fig. 59/1).
2. Let the pump motor run backwards briefly, to do this throw over
the main reverse switch (Fig. 59/2) (indicator light "Change
sense of rotation" will be illuminated).
3. Cover the area from the pressure flange to the mortar hose with
foil.
4. Press the blue pushbutton (Fig. 59/3) "Pump motor reverse"
(water supply will be interrupted automatically), until the
pressure on the mortar pressure manometer drops to 0.
Fig. 60: Loosen the tension rod nuts
5. Lightly loosen the nuts on the tension rod (Fig. 60/arrows) so
that any residual pressure can completely dissipate.
6. Loosen the hose coupling and clean the hose.
7. Introduce a water hose into the mortar hose and rinse out the
residual mortar.
(For how to clean the mortar hose, see chapter "Cleaning"
under "Operation" in this Operating Manual)
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