Gorman-Rupp T8A3S-B Super T Series Pump
Spare Parts for the Gorman-Rupp T8A3S-B Self-priming trash pump
Product Summary
Genuine OEM spare parts for the Gorman-Rupp T8A3S-B, a self-priming trash pump that handles solids-laden liquids and re-primes automatically. Impellers, seals, wear parts, check valves and bearings are listed below with Gorman-Rupp part numbers from manual OM-05277-02.
Spare Parts List
✓ Tick the parts you need. Codes are as printed in the Gorman-Rupp parts list; build variants and older serial numbers can use different parts, so pick your model in the form below. Not sure? Add a photo of the nameplate (model and serial number) and we’ll match the parts for you.
| Select | Part (as printed by Gorman-Rupp) | Part number & reference |
|---|---|---|
| Wear & Service Parts | ||
| Impeller | Part no. 12349 11000 · Item 1 | |
| Seal Assy | Part no. 46513-153 · Item 2 | |
| Wear Plate Assy | Part no. 46451-786 · Item 4 | |
| 8" Flap Valve Assy | Part no. 46411-066 · Item 29 | |
| Repair Rotating Assy (T8A3S-B, /F, /FM) | Part no. 44163-291 | |
| Repair Rotating Assy (T8A3S-B /WW) | Part no. 44163-292 | |
| Repair Rotating Assy (T8A3S-B /WWS) | Part no. 44163-302 | |
| Cover Plate Assy | Part no. 42111-344 · Item 34 | |
| Cover Gasket | Part no. 50G 19210 | |
| /WWS Seal Assy (For SST Shaft) (optional) | Part no. 12590A | |
| ADI Wear Plate (optional) | Part no. 12348A 1102H | |
| Check Valve Assys (Viton Blow-out) (optional) | Part no. 46411-090 | |
| Seals, Bearings & Shaft | ||
| O-Ring | Part no. 25152-384 · Item 6 | |
| O-Ring | Part no. S1915 · Item 7 | |
| O-Ring | Part no. 25152-273 · Item 19 | |
| Gasket | Part no. 12356G 19370 · Item 28 | |
| Gasket | Part no. 25113-038 · Item 30 | |
| O-Ring | Part no. S1914 · Item 40 · Qty 2 | |
| O-Ring | Part no. 25154-026 · Item 4 | |
| Seal Plate | Part no. 12350 10010 · Item 5 | |
| Gasket | Part no. 12350G 20000 · Item 6 | |
| Oil Seal | Part no. S1917 · Item 7 · Qty 3 | |
| O-Ring | Part no. S333 · Item 20 | |
| Ball Bearing | Part no. 23422-412 · Item 22 | |
| Impeller Shaft | Part no. 38515-587 16000 · Item 24 | |
| Ball Bearing | Part no. 23421-461 · Item 25 | |
| ADI Parts (Seal Plate) (optional) | Part no. 12350 1102H | |
| Other Core Parts | ||
| Back Cover Assy | Part no. 42111-837 · Item 8 | |
| Inspect Cover Assy | Part no. 42111-452 · Item 18 | |
| Pressure Relief Valve | Part no. 26662-005 | |
| Suction Flange (T8A3S-B, /F, /WW) | Part no. 12356 10010 | |
| Suction Flange (T8A3S-B /FM) | Part no. 38642-611 10000 | |
| Discharge Flange (T8A3S-B) | Part no. 1759 10010 | |
| Discharge Flange (T8A3S-B /F) | Part no. 12799 10010 | |
| Discharge Flange (T8A3S-B /FM) | Part no. 38642-612 10000 | |
| Sight Gauge | Part no. S1471 · Item 16 · Qty 2 | |
| Pressure Relief Valves (Sewage Type) (optional) | Part no. 46431-803 | |
How we confirm the exact part: Part numbers on this page are as printed in Gorman-Rupp manual OM-05277-02, parts list for serial numbers 1714027 and up. Pumps with earlier serial numbers, an “N” serial suffix or a different build can use different parts, so send the serial number or a nameplate photo and we’ll confirm the right part before we quote.
Service Intervals & When to Replace
- Daily: check general condition (temperature, noise, vibration, leaks) and pump performance (gauges, speed, flow).
- Lubrication: check bearing and seal-cavity lubrication weekly; replace the oil annually (SAE No. 30 non-detergent oil where specified).
- Every six months: inspect front impeller clearance (wear plate) and rear clearance (seal plate) and adjust or replace worn parts.
- Annually: inspect the check valve, bearings, shaft deflection and pump-to-driver alignment; clean the pressure relief valve.
- New applications: inspect wearing parts after the first 250 hours to set your wear rate. Intervals assume about 4,000 hours a year of intermittent duty; shorten them for abrasive or continuous duty.
Models
Model code: T8A3S-B. Suffixes such as /F, /FM, /WW and /WWS mark build variants (for example flanged or metric-flanged ports) that change some parts, so check the full model code and serial number on the nameplate.
Models & Key Specifications
| Model | Series | Ports (suction x discharge) | Max solids | Seal (as listed) | Parts list |
|---|---|---|---|---|---|
| T8A3S-B | Super T Series | 8" (200 mm) | 3.00" (76 mm) | Seal Assy | OM-05277-02 (S/N 1714027+) |
Port size and solids handling from Gorman-Rupp model data; parts from manual OM-05277-02. Typical uses: sewage lift stations, mine and quarry dewatering, stormwater and industrial effluent.
Troubleshooting
Pump fails to prime
Likely cause: Not enough liquid in the casing, a contaminated or damaged suction check valve, an air leak in the suction line, or a leaking or worn seal or gasket. Action: Fill the casing, clean or replace the check valve, correct leaks and check pump vacuum; replace a leaking or worn seal or gasket.
Low flow or pressure
Likely cause: Impeller or other wearing parts worn or damaged, impeller clogged, or suction lift too high. Action: Replace worn parts and check the impeller is centred and turns freely (adjust wear plate clearance); clear debris; reduce suction lift.
Pump clogs frequently
Likely cause: Discharge flow too slow, a clogged or binding check valve, or liquid too thick. Action: Open the discharge valve fully to raise the flow rate, clean the check valve, and dilute if possible.
Excessive noise
Likely cause: Cavitation, entrained air, loose mounting, or a clogged or damaged impeller. Action: Reduce suction lift and losses, remove the air source, secure the mounting, and clear or replace the impeller.
Bearings run too hot
Likely cause: Low or incorrect lubricant, unsupported piping or a misaligned drive. Action: Check lubricant type and level, support the piping and align the drive.
Request for Quotation
Selected Parts:
- No parts selected
Not sure which parts? Just send a photo of the nameplate or part below.
Gorman-Rupp T8A3S-B spare parts: frequently asked questions
Tap a question to see the answer.
What spare parts are listed for the Gorman-Rupp T8A3S-B?
The list includes the repair rotating assembly, pump casing assembly, cartridge seal assembly, impeller, wear plate, impeller shaft and inboard and outboard bearings. It also includes oil seals, O-rings, gaskets, the flap check valve and the pressure relief valve. Tick what you need and submit the quote form.
Which mechanical seal does the T8A3S-B use?
This page lists a double-floating, self-aligning mechanical cartridge seal, part 46513-153. The troubleshooting guide links a leaking seal to worn seal faces or a damaged sleeve, and recommends replacing the cartridge seal assembly. If you're unsure of your pump's build, send a nameplate photo or serial number.
Can I access the T8A3S-B impeller and wear plate without removing the piping?
Yes. The T8A3S-B has a removable cover plate that gives access to the impeller and wear plate without disconnecting the piping. The external shimless cover plate also lets you adjust the clearance between the impeller and wear plate. Both the impeller and the wear plate are on the parts list.
Why won't my T8A3S-B prime?
The troubleshooting guide lists three likely causes: not enough liquid in the casing, an air leak in the suction line, or a clogged check valve. The flap check valve is on the parts list if it needs replacing. Other Super T models are on our Gorman-Rupp pump spare parts page.