Lock out/tag out (LOTO) the pump and motor
Depressurize and drain the pump completely
Allow the pump to cool if previously in operation
Wear appropriate PPE (gloves, eye protection)
New mechanical seal kit (correct type and size)
Dial indicator (for shaft runout check)
Micrometer or calipers
Torque wrench
Clean, lint-free rags
Isopropyl alcohol or non-petroleum based cleaner
Silicone-based lubricant (for O-rings)
Soft-faced mallet (if needed)
Bearing grease (for shaft)
Disconnect and remove coupling
Remove bearing housing (if necessary)
Extract the gland plate assembly
Carefully remove old seal components:
Stationary seat from gland plate
Rotating assembly from shaft
Clean all surfaces thoroughly
✔ Verify shaft runout (< 0.05mm)
✔ Check shaft/sleeve for wear or scoring
✔ Inspect seal chamber for damage
✔ Confirm new seal matches specifications
✔ Ensure all components are clean and dry
Lightly lubricate O-ring with silicone grease
Install stationary seat into gland plate
Ensure proper orientation (consult drawing)
Seat firmly but don't force
Lubricate shaft lightly with grease
Slide rotating assembly onto shaft:
For component seals: install spring, rotating face, collar separately
For cartridge seals: install as complete unit
Align carefully to prevent O-ring damage
For component seals:
Set proper spring compression (typically 3-5mm)
Align set screws with shaft flats (if applicable)
Tighten set screws gradually in sequence
For cartridge seals:
No adjustment needed (pre-set compression)
Install new gaskets
Al gland plate carefully
Tighten bolts evenly in crisscross pattern
Torque to manufacturer's specifications
Rotate shaft manually - should turn smoothly
Check for proper alignment of all components
Verify no binding or interference
For dual seals, fill barrier fluid chamber
Prime the pump completely
Vent air from seal chamber (if applicable)
Start pump slowly
Monitor for:
Leakage (should be minimal)
Vibration
Temperature
Allow for initial run-in period (seal faces may seat)
Forcing components into place
Over-tightening set screws
Dry running the seal
Incorrect spring compression
Contaminating seal faces
Improper gland bolt tightening sequence
Using incompatible lubricants
Check seal flush system operation
Monitor leakage rates
Record operating temperatures
Keep spare seal kits on hand
Follow manufacturer's relubrication schedule
| Problem | Possible Cause | Solution |
|---|---|---|
| Excessive leakage | Damaged faces, improper install | Reinstall correctly, replace seal |
| Seal overheating | Dry running, misalignment | Ensure proper lubrication, align |
| Premature failure | Wrong seal type, chemical attack | Verify compatibility, material |
| Vibration | Improper installation, imbalance | Check alignment, balance |
Note: Always refer to the pump and seal manufacturer's specific instructions for your equipment. Proper installation is critical for mechanical seal longevity and leak-free operation.
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