Tuthill 20388900 Bearing Shim for HD Series Rotary Lobe Pumps
The Tuthill 20388900 is a genuine bearing shim for Tuthill HD Series rotary lobe process pumps. Shims are what set the axial position of the shafts in a rotary lobe pump, and that position is what holds the impellers clear of the faceplate and the housing. It is the least glamorous part in the pump and the one that decides whether the rebuild works.
Shims are listed on the parts list as an as required item in three published thicknesses of 0.002, 0.005 and 0.015 inch, so the quantity and the thickness both come out of the clearance measurement rather than off a fixed order sheet. Keep a mixed set on the shelf if the pump is rebuilt in house. Shim packs are built up from more than one thickness, so keep a mixed set rather than a box of one size. Measure, shim, measure again, and only then lock the carriers down.
Key Features
- Genuine Tuthill bearing shim
- Direct replacement for HD Series bearing carriers
- Published in 0.002, 0.005 and 0.015 inch thicknesses across the family
- Listed on the parts list as an as required item
- Sets the axial shaft position that holds impeller clearance
- Stacked to reach a measured target rather than fitted to a fixed count
Applications
- Viscous and abrasive slurry transfer
- Corrosive acid and chemical process duty
- Fluids carrying suspended solids that must not be sheared
- Heavy process oils, resins and adhesives
- Scheduled overhaul of Tuthill rotary lobe process pumps
- Critical spares holding for continuous process plant
Specifications
- Brand: Tuthill
- Manufacturer Part Number: 20388900
- Part Type: Bearing Shim
- Fits: Tuthill HD Series rotary lobe process pumps
- Quantity Required: as required
- Condition: New
Frequently Asked Questions
Q: Do I need shims if only a seal is being changed?
Not usually, as long as the bearing carriers have not been disturbed. If they have, the clearance has to be checked again.
Q: Are shims interchangeable between pump sizes?
No. Each pump size has its own shim, and a shim from a neighboring frame will not sit correctly in the carrier.
Q: How many shims will I need?
There is no fixed answer. The count comes from the clearance measurement on your pump, which is why the parts list calls them an as required item.
Q: Can I reuse the shims that came out?
Only if they are flat, clean and undamaged. Anything creased or burred should be replaced, and the old stack is a starting point rather than an answer.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct shim.
CLRMarine
