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A guide for replacing the wear seal on a 5 hp vacuum pump.
A printable PDF guide is available to download at the bottom of the page.
Tools and Supplies Needed:
- Slide Hammer
- T45 Torx Socket
- Ratchet
- Spanner Socket
- Small Putty Knife
- Shop Towels
- 1″ Wrench
- 5/8 Socket Wrench
- Feeler Gauge
- 1-1/4″ pipe
- Metaflux Spray PN# 3400037
- 5MM Hex Socket
- 10MM Hex Socket
- Puller Plate
- Straight Edge
- Loctite 243
If not done so beforehand, disconnect the pump from the machine, drain it as much as possible, then place it on a waist high table.
Use a 10 mm socket head to remove the 5 bolts securing the cover.
While one person holds the pump body, have another remove the cover. Use a cloth to soak up any spilled oil.
Use the spanner wrench to remove the sealing nut. Inspect, then replace the o-ring if necessary.
Measure the distance between the casing and impeller with a feeler gauge and straight edge. Note: record the distance and use it to set the impeller blade during reassembly.
Immobilize the impeller by wedging a 1-¼” pipe in between the blades, then remove the bolt with a ⅝” socket wrench.
Install the puller plate onto the impeller blade with a 6 mm socket wrench.
Screw the slide hammer onto the puller plate, then pull out the impeller blade.
Remove the puller plate, flip the impeller blade upside down, and remove the carbon spring seal with a narrow putty knife. Inspect, clean, then replace the carbon spring seal and o-ring if necessary.
Use the T45 socket wrench to remove the countersunk screw from the port plate, then remove it from the end casing and dispose of it.
Clean and re-oil (wayoil). Use a 5 mm socket wrench to verify the reed valve is correctly placed and secured before installing the new port plate. Inspect, then replace any o-rings as necessary.
Apply Loctite 243 to the countersunk screw and fasten the port plate to the end casing – set aside. Note: line up the port plate with the middle and bottom bolt.
Reattach the carbon spring seal to the impeller blade, then re-seat it onto motor shaft.
Immobilize the impeller by wedging a 1-¼” pipe in between the blades, then secure the impeller blade bolt with a ⅝” socket wrench.
Use the previously recorded feeler gauge measurement to correctly place the impeller blade.
Use the spanner wrench to secure the sealing nut. Use the 10 mm socket head to reattach the 5 bolts, securing the cover. Insert the drain plug
You can now put the pump back into production. Verify your seal water and breather relief valve is set correct.