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10.2
Changing the shaft-sealing rings
shaft-sealing rings are wearing parts subjected to relatively low stresses in the coupling. On couplings
which are filled with oil no maintenance interval need be adhered to.
On couplings which are filled with water the shaft-sealing rings of the inner seal must be replaced after
12 000 operating hours or after 2 years of operation. We recommend also replacing the other seals and
rolling bearings at the same time.
10.3
Maintenance interval of the NEUPEX addon coupling
The torsional backlash between the two coupling parts must be checked after three
months, then at least once a year.
If an increased coupling backlash does not impair the operation of the coupling, the flexible elements (12)
can continue to be used up to a specified wear limit before being replaced. To assess wear, the permitted
torsional backlash, converted to the chord dimension ΔS
table 10. To obtain the dimension ΔS
a mark applied to both side (see figure 11). If the coupling part is rotated in the opposite direction of rotation
as far as the stop, the marks move apart. The distance between the marks is the chord dimension ΔS
If the dimension ΔS
The flexible elements must be replaced in sets.
Only identically marked flexible elements must be used.
Fig. 11: Maintenance interval of the NEUPEX addon coupling
Table 10: Wear mark
FLUDEX Size
N-EUPEX Size [d
Wear mark ΔS
Replacement space a [mm]
If the above specified maintenance instructions are not adhered to, a correct operation
within the meaning of the explosionprevention requirements or Directive 2014/34/EU
can no longer be guaranteed.
Use in potentially explosive areas is then not permitted.
10.4
Replacement of the flexible elements
Only original NEUPEX flexible elements must be used for replacement to guarantee troublefree torque
transmission and faultfree operation.
On the FAD design replacement of the flexible elements (12) is possible without moving the coupled
machines, if the replacement dimension "a" (see table 10 and figure 11) is allowed for. After the screw
connection part 2/3 is released, part 3 is shifted axially and turned towards part 2. The flexible
elements (12) are now freely accessible.
On the FADS design the flexible elements (12) can be demounted after the adaptor (6) and the cam part (7)
has been removed.
For refitting, the instructions in section 6, "Fitting", and section 7, "Startup", must be carefully observed.
28
, one coupling part is rotated without torque as far as the stop and
V
exceeds the value in table 10, the flexible elements (12) must be replaced.
V
a
]
1
[mm]
V
on the outer coupling diameter, is shown in
V
222
297
342
110
125
140
7.0
8.0
8.0
13
11
16
395
450
516
225
250
315
9.0
10.0
10.5
9
11
-
Operating instructions 10/2017
.
V
590
315
10.5
-
FLUDEX 4600 en
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