Gorman Rupp 13A20-B Pump
Spare Parts for 13A20-B Self Priming Pump
Product Summary
The Gorman-Rupp 10 Series 13A20-B is a compact, reliable self-priming centrifugal pump engineered for versatile municipal, agricultural, and light industrial applications requiring efficient handling of liquids with moderate solids content. This mid-range model in the proven 10 Series family delivers dependable performance in sewage bypass pumping, irrigation systems, construction dewatering, and general transfer applications where portability and ease of maintenance are essential.
- Effective Solids-Handling Capability: Semi-open impeller design efficiently handles liquids containing up to 1.5 inch (38mm) diameter spherical solids, making it suitable for agricultural wastewater, light sewage, and construction site drainage applications
- Proven Self-Priming Performance: Integrated suction check valve and efficient priming design ensure reliable self-priming operation, eliminating costly foot valves and enabling flexible installation above the liquid source
- Durable Cast Iron Construction: Heavy-duty cast iron casing with ductile iron impeller provides excellent durability and long service life in demanding agricultural and municipal applications
- Easy Field Maintenance: Removable back cover provides quick access to wear plate without disconnecting piping, while simple pedestal-mounted design enables seal and impeller service with basic tools and minimal downtime
- Flexible Drive Options: Compatible with electric motors (single/three-phase), gasoline/diesel engines, or bare shaft configurations using flexible coupling or V-belt drive systems to match available power sources
Spare Parts List
| Select | Qty | Part Number | Description | Material / Spec |
|---|---|---|---|---|
| 1 | 2996C | Impeller | Semi-open ductile iron, 1.5" solids passage | |
| 1 | 12451A | Seal Assembly | Complete mechanical seal assembly | |
| 1 | 2634A | Wear Plate Assembly | Replaceable impeller wear surface | |
| 1 | 1348 | Flap Valve Assembly | Suction check valve, complete assembly | |
| 1 | 38514-549 | Impeller Shaft | Steel shaft with bearing journals | |
| 2 | 23275-008 | Ball Bearing (Set of 2) | Shielded ball bearings (inboard & outboard) | |
| 1 | 25227-311 | Oil Seal (Inboard) | Pedestal inboard oil seal | |
| 1 | 25227-303 | Oil Seal (Bearing Retainer) | Outboard bearing retainer oil seal | |
| 1 | S506 | Oil Seal (Seal Plate) | Seal plate oil seal | |
| 1 | 38272-344 | Seal Plate | Cast iron seal mounting plate | |
| 1 | 12449 | Shaft Sleeve | Seal shaft sleeve | |
| 1 | 3G | Casing Gasket Set | Pump casing gasket set | |
| 1 | 2985G | Back Cover Gasket | Back cover plate gasket | |
| 1 | 38322-521 | Bearing Retainer | Outboard bearing retainer | |
| 1 | 10474 | Impeller Washer | Impeller thrust washer | |
| 1 | N0407 | Shaft Key | Drive shaft key | |
| 1 | 2X | Impeller Adjustment Shim Set | For setting impeller-to-seal plate clearance (.020-.040") | |
| 1 | S247 | Retaining Ring | Bearing retaining ring | |
| 1 | 3272 | Slinger Ring | Oil slinger | |
| 1 | 25152-235 | O-Ring (Bearing Retainer) | Bearing retainer O-ring seal |
Exploded Parts Views
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model / Series | 13A20-B (10 Series) |
| Pump Type | Semi-Open Impeller, Self-Priming Centrifugal |
| Flow Performance | See performance curve (Page E-1 of manual) |
| Rated Power | Varies by application (Typical motor: 1.1-2.2 kW) |
| Voltage / Frequency | 240V Single-Phase / 415V Three-Phase, 50Hz (Other voltages available) |
| Suction / Discharge Connection | 2" Suction / 1.5" Discharge (Optional flanges available) |
| Solids Handling Capability | Up to 1.5" (38mm) diameter spherical solids |
| Maximum Liquid Temperature | 160°F (71°C) |
| Impeller Type | Semi-Open Ductile Iron Centrifugal |
| Rotation Direction | Per arrow on pump body (varies by configuration) |
| Seal Type | Mechanical Seal with External Lubrication (Bottle Oiler) |
| Materials of Construction | Cast Iron Casing, Ductile Iron Impeller |
| Installation Type | Pedestal Mounted, Self-Priming |
| Minimum Back Cover Clearance | 6 inches (152mm) minimum, 18 inches (457mm) recommended |
| Bearing Lubrication | SAE No. 30 Non-Detergent Oil (Check via sight gauge) |
Troubleshooting, Common Faults & Solutions
Pump Fails to Prime
Likely Cause: Suction check valve contaminated/damaged, air leak in suction line, collapsed suction hose lining, leaking/worn seal or gasket, suction lift/discharge head too high, strainer clogged, insufficient liquid in casing
Action / Part: Clean or replace check valve assembly (9915), correct air leaks in suction line, replace collapsed suction hose, check pump vacuum (should pull 20" Hg minimum), replace seal assembly (12446) or gaskets (2474G, 2527G), verify suction lift within rated limits, clean strainer, refill pump casing through fill cover
Pump Stops or Fails to Deliver Rated Flow/Pressure
Likely Cause: Air leak in suction, collapsed hose, worn seal/gasket, clogged strainer, suction intake not properly submerged, worn/damaged impeller or wear plate, clogged impeller, pump speed too slow, discharge/suction head too high
Action / Part: Correct suction leaks, replace hose, replace seal assembly (12446) or gaskets, clean strainer, verify proper submergence (see manual Figure 2), replace worn impeller (1692AS) and/or wear plate (2605), clear impeller debris, check driver output/belts for slippage, adjust discharge valve, measure suction lift with vacuum gauge
Pump Requires Too Much Power
Likely Cause: Pump speed too high, discharge head too low, liquid too thick, bearings frozen
Action / Part: Check driver output speed, verify sheaves/couplings correctly sized, adjust discharge valve to increase head, dilute liquid if possible, disassemble pump and check bearings (S1040, S1080)
Pump Clogs Frequently
Likely Cause: Liquid too thick, discharge flow too slow, check valve or foot valve clogged/binding
Action / Part: Dilute liquid if possible, open discharge valve fully to increase flow rate, run power source at maximum governed speed, clean check valve (9915) or foot valve
Excessive Noise / Cavitation
Likely Cause: Cavitation (excessive suction lift/friction losses), clogged/damaged impeller, pump/drive not securely mounted, pumping entrained air
Action / Part: Reduce suction lift and friction losses, record vacuum/pressure gauge readings (consult factory if needed), clean impeller debris or replace impeller (1692AS) if damaged, secure all mounting hardware, locate and eliminate air bubble source
Bearings Run Too Hot
Likely Cause: Low/incorrect lubricant, suction/discharge lines not properly supported, drive misaligned
Action / Part: Note: Bearings normally run to 160°F (71°C). Check SAE No. 30 non-detergent oil level via sight gauge (76) - maintain at middle of gauge (12.5 oz / 0.37L capacity), support piping independently, align drive properly (see manual Section B). If bearings repeatedly overheat, replace bearings (S1040, S1080), oil seals (25258-411, S1452), and bearing retainer O-ring (S2085)
Seal Leakage
Likely Cause: Worn/damaged mechanical seal, insufficient seal lubrication, contaminated seal faces, damaged shaft sleeve, worn seal plate oil seal
Action / Part: Replace complete seal assembly (12446) - never reuse old seal as wear patterns cannot realign, keep bottle oiler (S1933) full with SAE No. 30 non-detergent oil, replace shaft sleeve (3428A) if nicked or damaged, replace seal plate oil seal (S506). IMPORTANT: Impeller-to-seal plate clearance must be .020-.040" - adjust using impeller shim set (37J)
Pump Overheats
Likely Cause: Operating against closed discharge valve, insufficient flow, liquid temperature exceeds 160°F (71°C), pump running dry
Action / Part: CRITICAL: Stop pump immediately if overheated - allow complete cooling before servicing. Never remove covers/plugs from hot pump. Open discharge valve, verify sufficient flow, cool liquid if over 160°F, refill pump casing if run dry (priming). Do not operate against closed discharge valve for extended periods
Incorrect Rotation
Likely Cause: Motor wiring incorrect (three-phase motors)
Action / Part: CRITICAL: Correct rotation is indicated by arrow on pump body. Running pump in wrong direction will cause impeller to unscrew from shaft, causing severe damage. Disconnect pump from motor before checking rotation. For three-phase motors, have qualified electrician interchange any two of three phase wires to change direction. For single-phase motors, consult motor literature
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