Tetra Pak Hoyer Frigus 400, Manual

Page: 37 / 97

7-5
Tetra Pak
Hoyer
F40 03 GB 00
7.2 Maintenance
7.2.1 Mechanical maintenance
• Transmission belt
Proceed as follows to replace the belt connecting
the main motor with the dasher:
Slacken the lock nut (1) and the nut (2) so that the
belt is no longer under tension.
Remove and replace the belt.
Tighten up the belt using the nut (2).
While tightening up the belt, check that it is
completely inside the driven pulley and tighten
up the lock nut (1).
Start up the dasher again, and check that the belt
stays in position and does not tend to ride up and
down on the driven pulley.
• Rotating seal (Fig. 7.4)
Check the rotating seal (5) assembled on the
lower end of the dasher and coupled to the bush
(6) fastened to the bottom (11) by the ring nut
(12).
The rotating seal has a housing made of hard metal
which, under pressure from the spring (7), rotates
against the face of the bush (6).
Check that the surface of the housing has no
scratches which could affect its hold.
Use fine emery paper to polish the two surfaces.
Rub them first against a very hard surface
(glass), then against one another.
Replace the ring gaskets (48) if they are worn.
• Dasher (Fig. 7.4)
Check that the eccentric (13) turns freely inside
the dasher. If this is not the case, dismantle the
elastic ring (14) and remove the dasher (15) and
the eccentric (13) from the support (16) and
check the condition of the bushings . Lubricate the
bushings before reassembling the dasher.
• Scraper blades
Inspect the scraper blades (1).
They must be assembled in their pins so that
they can tilt when the dasher rotates.
If the edge of the blade is not in perfect condition,
the blade should be replaced.
Fig.7.2
Fig.7.3
1
2
0,5 mm
0,2/0,3 mm
1
1
1
min. 26 mm