4 Repair
4.1.4 Fitting new Bearings and Seals
3HAC021111-001 Revision: B 63
4. The seal must also be checked before it is fitted to ensure that:
5. The seal edge is not damaged (feel the edge with your finger nail),
6. The correct type of seal is used (has a cut-off edge),
7. There is no other damage.
8. Grease the seal just before it is fitted – not too early as otherwise dirt and foreign
particles may stick to the seal. The space between the dust tongue and sealing
lip should 2/3-filled with grease of type Shell Alvania WR2 (ABB’s art. No. 3537-
1). The rubber coated external diameter must also be greased.
9. Seals and gears must be fitted on clean workbenches.
10.Fit the seal correctly. If it is fitted incorrectly, it may start to leak when pumping
starts.
11.Always use an assembling tool to fit the seal. Never hammer directly on the seal
because this will cause it to leak.
12.Use a protective sleeve on the sealing edge during assembly, when sliding over
threads, key-ways, etc.
Flange Seals and
Static Seals
1. Check the flange surfaces. The surface must be even and have no pores. The
evenness can be easily checked using a gauge on the fitted joint (without sealing
compound).
2. The surfaces must be even and free from burr dust (caused by incorrect machin-
ing). If the flange surfaces are defective, they must not be used as they will cause
leakage.
3. The surfaces must be cleaned properly in the manner recommended by ABB.
4. Distribute the sealing compound evenly over the surface, preferably using a
brush.
5. Tighten the screws evenly around the flange joint.
6. Make sure that the joint is not subjected to loading until the sealing compound has
attained the hardness specified in the materials specification.
O-rings 1. Check the O-ring grooves. The grooves must be geometrically correct, without
pores and free of dust and grime.
2. Check the O-ring for surface defects and burrs, and check that it has the correct
shape, etc.
3. Make sure the correct O-ring size is used.
4. Tighten the screws evenly.
5. Defective O-rings and O-ring grooves must not be used.
6. If any of the parts fitted are defective, they will cause leakage. Grease the O-ring
with Shell Alvania WR2 (ABB’s art. No. 3537-1) before fitting it.
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