How to Rebuild an Edwards E2M28 Vacuum Pump (Step-by-Step Guide)
Download user manual and schematics for more help.
The Edwards E2M28 is a trusted workhorse in laboratories and industrial environments around the world. But like any rotary vane vacuum pump, it needs periodic maintenance — and eventually, a full rebuild. Whether you're experiencing reduced performance, oil leaks, or excessive noise, a proper rebuild can extend the life of your E2M28 for years.
In this blog post, we’ll walk you through the essentials of rebuilding an Edwards E2M28 vacuum pump — with tips, tools, and the parts you'll need.
? Tools & Materials You’ll Need
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Allen wrenches / socket set
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Soft mallet
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Torque wrench
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Clean work surface
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Solvent or degreaser
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Lint-free wipes
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Vacuum pump oil (Ultragrade 19 or equivalent)
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E2M28 rebuild kit (includes gaskets, seals, o-rings, and vanes)
? Order your full rebuild kit at VacuumPumpSupply.com
⚠️ Safety First
Before beginning:
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Disconnect power to the pump
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Drain all oil (Dispose of properly — oil may contain hazardous substances)
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Let the unit cool completely
? Step-by-Step: Rebuilding Your Edwards E2M28
1. Disassembly
Start by removing the motor housing, fan cover, and oil case. Carefully disconnect any electrical connections and remove the motor assembly. Pay close attention to the orientation of each part — taking photos along the way is a great idea.
2. Remove the Pump Module
Unbolt and remove the gas ballast assembly and exhaust box. Next, remove the end cover and internal components including:
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Rotor
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Shaft
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Vanes (replace with new ones)
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Springs
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Bearings
Inspect for scoring, wear, or corrosion — especially on the rotor and stator.
3. Clean All Parts
Clean internal metal components with a degreaser or solvent. Ensure that all old oil, carbon deposits, and gasket residue are completely removed. Be meticulous — contaminants will compromise your rebuild.
4. Replace Seals, Gaskets, and Vanes
Using the E2M28 rebuild kit, install new:
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Shaft seals
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O-rings
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Gaskets
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Vanes
Lubricate all moving parts with fresh vacuum pump oil during reassembly. Use the correct torque on bolts to prevent warping.
5. Reassemble the Pump
Reverse the disassembly process. Make sure all mating surfaces are clean and aligned. Install the rotor, stator, and vanes, ensuring proper vane orientation and spring positioning. Replace the oil sight glass and reinstall the oil box.
6. Fill with Oil and Test
Add the recommended amount of fresh Ultragrade 19 oil. Turn the pump over by hand before powering it up. Then run the pump for a short cycle with the inlet closed and listen for any irregular noises or leaks.
After 30 minutes, check:
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Oil level and color
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Ultimate vacuum
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Any signs of leaks
✅ When to Rebuild vs Replace
Rebuild if:
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Pump doesn’t reach ultimate vacuum
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Excessive oil mist or smoke
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Internal parts are still mechanically sound
Replace if:
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Casing is cracked
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Severe rotor scoring
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Repair exceeds cost of replacement
?️ Need Help or Parts?
At VacuumPumpSupply.com, we stock OEM-quality rebuild kits and replacement parts for the Edwards E2M28 — including:
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Seal kits
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Vane kits
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Oil filters and exhaust filters
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Complete rebuild services
? Shop Now: VacuumPumpSupply.com
? Questions?
Final Thoughts
Rebuilding your Edwards E2M28 is a smart, cost-effective way to keep your system running strong. With the right parts, tools, and attention to detail, even a heavily used pump can be brought back to peak performance.
Need help identifying your parts or want a quote on rebuild services? Contact us today!