The motor and brake functions are achieved in part by
means of shared components. The braking action is
applied at the lateral surfaces of the rotor. The rotor is
pressed via spring force from the cover-side of the
motor against a second braking surface located on the
opposite side by means of a piston on which braking
material is bonded.
R E M O VA L
The hoist must first be unloaded and disconnected from
the main air supply.
Note:
The following operations can be performed from
the nameplate side after the motor has been removed.
Checking vane wear, replacing the vanes
with starting aids if necessary.
Checking brake wear, replacing the brake piston
if necessary.
Renewing the motor lubrication.
The replacement of the centre section halves with brake
lining is described under a separate item.
Unscrew the nameplate
1
.
Remove the motor cover bolts
2
and pull out the
motor cover
3
(when the cover bolts are removed,
tension of the brake springs
4
is fully released).
Remove the brake springs.
Remove the brake piston
5
from the internal cylinder
integrated in the motor housing.
Pull out the rotor
6
, removing the vanes
7
and
starting aids
8
.
Checking vane wear:
(See illus.
Checking vane wear,
page 50).
Worn vanes reduce the motor
power and consequently the lifting performance.
Replacing the
vanes together with the starting aids.
Checking braking surfaces of the brake piston and
the centre section half with brake lining for wear and
damage:
The circular wear pattern in the braking surfaces must
not be deeper than 0.2 mm (see also illustration
page 50). The extremely low-wear braking material will
not reach the wear limit of 0.2 mm within the design-
dependent service life of the hoist, under intended use.
Should the wear limit be reached prematurely, the actual
pressure must be checked with the device switched on
(the brake drags in the event of insufficient pressure).
M O T O R I N S TA L L AT I O N /
C H E C K I N G B R A K E L I N I N G S A N D
VA N E S / M O T O R L U B R I C AT I O N
powered by air !
M A I N T E N A NC E
Page 49
Replacing brake discs, brake piston and vanes /Motor installation
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8
13
11
12
7
6
10 9
5
4
3
2
1
Summary of Contents for Profi 025Ti
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