SPX TG H15-50, Instruction Manual, Page: 69 / 110

69
9010
A.0500.351 – IM-TGH/07.02 EN (10/2015)
4.7.4 General instructions during assembly
• Do not touch the mechanical seal faces with hand or fingers. Fingerprints can make the
mechanical seal untight. Clean the seal faces if necessary. Use a shammy.
• If the mechanical seal faces are made of non self-lubricating material, it is recommended to
lubricate the faces a little with the pumped liquid or with thin oil. Do not use grease!
• Lubricate the O-rings when assembling. Take care of compliance of the lubricant and the
rubber material. Never use mineral oil using EP rubber O-rings.
• When fitting PTFE sealings the shaft must be very smooth. Assembly of solid PTFE sealings can
be facilitated by heating the stationary ring in water at 100°C during 15 minutes. Pre-
assemble the rotary ring on a dummy shaft and heat both ring and shaft in water at 100°C
during 15 minutes. Then let everything cool off. To be tight, PTFE seals must rest for approx.
2 hours, so that the O-ring remains in its new shape.
• In cases where the mechanical seal is provided with fixing screws to fix the rotating part on the
shaft, it is recommended to screw out the fixing screws, degrease both holes and screws and
lock them with Loctite (usual type 241 or heat-resistant type 648).
• If the mechanical seal is not provided with a set screw - e.g. Sealol type 043, or Burgmann
MG12, a set ring with set screws must be provided. Take the set screws out of the set ring and
degrease both holes and screws of the set ring.
Remark: The set ring that is delivered by SPX guarantees a reliable fixation. There is no danger it
will be loosened by alternating loads. SPX cannot guarantee a reliable fixation with other set rings.
4.7.5 Assembly of the stationary seat
1. Fit the stationary seat(s) into the casing.
2. Use appropriate tools to push the seat perpendicularly
in its housing.
3. Protect the seat face with a piece of paper or hardboard and
lubricate the rubber sealing elements with a lubricant.
This will facilitate the assembly.
Attention: Do not use mineral oil for EP rubber.
4. Check the perpendicularity of the seat face to the
shaft-rotating axis after assembling.
4.7.6 Assembly of the rotating part
1. Lubricate the shaft a little with a lubricant.
Attention for EP rubber: Do not use mineral oil!
2. Protect the sharp edges of the shaft with tape or another protecting tool.
3. Use a conical assembling bush (9010) on the shaft step (see figure).
4. Push the rotating parts against the adjusting shoulder or set ring.
5. Provide the set screws with a drop heat-resistant Loctite and fit the set screws in the rotating
part. Tighten the screws.
Assembly of the rotating part