21. Position the rotor locking piece in fig. 3 and 11, respectively, and
tighten the bearing lock nuts (50) until no backlash can be felt in
the bearing assembly.
22
. Remove the rotors (35) from the shafts as described in section 4.2.
23. Check that the shafts (38,39) turn freely.
24. Check that the running torque of both drive shaft (38) and
auxiliary shaft (39) is as specified in the table in section 6.1.
Measure the relevant torque without lipseals. During the
measuring the bearings must be lubricated with WD40.
Check that the shafts can run freely.
25. If the torque is not within the specification given in section 6.1
then adjust the nuts (50) and repeat the procedure until the
correct torque is obtained.
26. Bend the locking tab on the washer (49).
27. Refit circlip (51), spacing ring (52) and gear key (40) on the
shafts (38,39).
28. Refit the gears (54) as described in section 4.6.1.
29. Fit the oil seal plate (10) with lipseals (42) as described in
section 4.7.1 and the rotor case (9) as described in section 4.3.1.
30. Fit rotors (35) as described in section 4.2.1. Check that the
stationary seal faces (D), and O-rings (C) are in place in the rotor
case (9). Check seals (B,D) for debris and scratches.
31. Re-fit the can (26) as described in section 4.4.1.
32. Re-fit the front cover (1) as described in section 4.1.1.
33. Ensure that the rotors turn freely.
5.5 Recommended holding of spare parts
We recommend that both seal kits and service kits are held in stock.
Seal Kit
The seal kit consists of the wearing parts of the seal.
Service Kit
The service kit is made up of a number of the main components of
the pump. These components are not wearing parts, but replacement
may be necessary. These components are rotors (35), front cover (1),
rotor case (9), rotor screws (32), spacing washers (37), shafts
(38,39), bearings (45,48), gears (54), and gear shims (53).
The table below shows the recommended stock of spare parts for
normal operation, and for applications where there are special requi-
rements - for example 24 hour operation, operation with abrasive
me-dia, or processes which are sensitive to even a short production
stop.
5. Maintenance
Normal operation
Special requirements
0
1
1
2
1
1
0-5 5-20 >20
Kits Kits Kits/10 pumps in oper.
SERVICE PARTS
Number of pumps in operation
1
2
2
3
1
2
0-5 5-20 >20
Kits Kits Kits/10 pumps in oper.
WEARING PARTS
(Seal face kit, Elastomer kit)
Number of pumps in operation
Fig. 3
Fig. 11
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