Goulds Pump Rebuild Kits | J5, J7, GT10, GT20 Replacement Parts | ASIW Supply
Share
If your Goulds pump is losing pressure, leaking at the seal, or making more noise than it used to, you’re facing a familiar decision: replace the entire pump or rebuild it. In most cases, a rebuild is the smarter move. A complete pump rebuild kit restores like-new performance for a fraction of the cost of a new unit — and with the right parts on hand, most rebuilds can be completed in an afternoon.
At ASIW Supply, we stock complete rebuild kits for the most popular Goulds pumps in the field, including the J Series shallow well jet pumps (J5S, J7S, J10S, J15S) and the GT Irri-Gator centrifugal series (GT07, GT10, GT15, GT20) — at prices significantly lower than what you’ll find anywhere else on the market. Here’s everything you need to know about choosing the right kit, what’s inside each one, and how to know when it’s time for a rebuild.
Note: These are high-quality aftermarket replacement kits designed to fit Goulds pumps. They are not Goulds-branded products, and ASIW Supply is not affiliated with Goulds Water Technology. All part numbers are for reference and compatibility purposes only.
Why Rebuild Instead of Replace?
Goulds pumps are built to last decades — but the wear components inside them aren’t. Mechanical seals, impellers, diaphragms, and diffusers all degrade over time, especially in systems moving sandy or silty water. When one of these parts fails, the pump body and motor are usually still in excellent shape.
Rebuilding with a complete kit offers several advantages:
- Major cost savings. A rebuild kit costs a fraction of a new pump — and our kits are priced well below comparable kits from other suppliers, so you save twice.
- Everything in one box. No hunting down individual seals, impellers, and diffusers from three different vendors.
- Restored performance. A fresh impeller and diffuser bring flow rates and head pressure back to spec.
- Less downtime. With a kit on the shelf, your pump is back online in hours — not waiting weeks on a replacement unit.
Signs Your Goulds Pump Needs a Rebuild
Watch for these common symptoms before a small problem becomes a full system failure:
- Water dripping or spraying from behind the pump casing (failed mechanical seal)
- Noticeable drop in pressure or flow, even with a clean intake (worn impeller or diffuser)
- Pump runs but struggles to prime or hold prime (worn seal ring or diaphragm)
- Grinding or rattling noises during operation
- Motor running hotter than normal or short-cycling
If you’re seeing any of these, a rebuild kit will almost always solve the problem — as long as the motor and casing are sound.
Rebuild Kits for Goulds J Series Pumps (J5S, J7S, J10S, J15S)
The Goulds J Series shallow well jet pumps are workhorses for residential wells, lawn sprinkling, and general water supply. Our rebuild kits for the J Series include every wear part you need in one box:
| Part | J5S / J5SH Kit | J7S Kit | J10S | J15S |
|---|---|---|---|---|
| Seal Ring | 5K555 (new style, replaces 5K6) | 5K555 | 5K555 | 5K555 |
| Mechanical Seal | PS-100 (equivalent to 10K10) | PS-100 | PS-100 | PS-100 |
| Diaphragm | 5K557 (new style, replaces 5K162) | 5K557 | 5K557 | 5K557 |
| Impeller | 2K4 | 2K60 | 2K61 | 2K706 |
| Guidevane / Diffuser | 3K75 | 3K67 | 3K67 | 3K68 |
A note on updated part numbers: Some older Goulds components have been superseded. The 5K555-style seal ring replaces the original 5K6, and the 5K557-style diaphragm replaces the 5K162. If you’re working from an older parts diagram, these new-style parts are the correct, current replacements — they fit and perform as intended in existing pumps.
Shop the J Series kits:
- Goulds J5 Pump Rebuild Kit — fits J5S and J5SH
- Goulds J7 Pump Rebuild Kit — fits J7S
Rebuild Kits for Goulds GT Irri-Gator Pumps (GT07, GT10, GT15, GT20)
The GT Irri-Gator series is the go-to self-priming centrifugal pump for lawn sprinkler systems, landscape irrigation, and ag applications. These pumps see heavy seasonal use, which makes seals and impellers the first components to wear out.
| Part | GT07 | GT10 Kit | GT15 | GT20 Kit |
|---|---|---|---|---|
| Seal Ring | — | 5K555 (replaces 5K6) | 5K555 | 5K555 |
| Mechanical Seal | PS-100 (equiv. to 10K10) | PS-100 | PS-100 | PS-100 (equiv. to 10K258 and 10K10) |
| Diaphragm | 5K522 | 5K522 | 5K522 | 5K522 |
| Impeller | 2K715 | 2K716 | 2K714 | 2K713 |
| Guidevane / Diffuser | 3K72 | 3K71 | 3K70 | 3K70 |
Shop the GT Series kits:
- Goulds GT10 Pump Rebuild Kit — fits GT10 (1 HP)
- Goulds GT20 Pump Rebuild Kit — fits GT20 (2 HP)
The Lowest Prices on the Market — Here’s How
Compare our rebuild kit pricing against other pump parts suppliers and you’ll notice the difference immediately. Because we source complete kits rather than marking up individual branded components, we’re able to offer these kits at prices much lower than others on the market — often a fraction of what you’d pay piecing together the same parts elsewhere. Same fit, same function, significantly less money out of your pocket.
For contractors and irrigation pros stocking multiple kits, wholesale pricing drives the cost down even further.
How to Identify Your Pump Model
Not sure which kit you need? Check the nameplate on your pump’s motor or casing — the model number (J5S, GT20, etc.) is printed there along with the horsepower rating. As a quick reference for the GT series: GT07 is 3/4 HP, GT10 is 1 HP, GT15 is 1.5 HP, and GT20 is 2 HP. If the nameplate is worn or missing, our technical team can help you identify the correct parts from photos or measurements — just contact us.
Quick Rebuild Tips
A pump rebuild is a straightforward job for anyone comfortable with basic tools. A few pointers for a clean, leak-free result:
- Disconnect power and depressurize the system before starting any teardown.
- Secure the motor shaft with a shaft wrench when removing the old impeller to avoid damaging internal components.
- Clean the seal housing thoroughly before pressing in the new mechanical seal — debris is the number one cause of early seal failure.
- Never touch the seal faces with bare fingers; oils from your skin can compromise the sealing surface.
- Torque the casing bolts evenly to prevent housing cracks and ensure a leak-free reassembly.
- Re-prime the pump completely before startup — running a centrifugal pump dry, even briefly, can destroy a brand-new seal.
Why Buy Your Rebuild Kit from ASIW Supply?
- Unbeatable pricing — much lower than other suppliers for the same complete kit
- Complete all-in-one kits — seal, impeller, diffuser, and diaphragm in a single box
- In stock and ready to ship — keep your irrigation season on schedule
- Wholesale pricing available for contractors and multi-unit fleets
- Real technical support — call us at (772) 468-0888 with your model number and we’ll confirm the right kit
Don’t wait for a mid-season failure to take out your irrigation system. Shop the Goulds J5, J7, GT10, and GT20 rebuild kits, or browse our full selection of pumps and engine parts today.
Frequently Asked Questions
What comes in a rebuild kit for my Goulds pump? Each kit includes the primary wear components for your pump model: the mechanical seal, impeller, guidevane/diffuser, diaphragm, and (where applicable) the seal ring. Everything you need for a complete rebuild in one package.
Are these genuine Goulds-branded parts? No — these are high-quality aftermarket replacement kits made to fit Goulds J Series and GT Irri-Gator pumps. That’s exactly why we can offer them at prices much lower than others on the market. Goulds part numbers listed on this page are for reference and compatibility purposes only.
Will these kits fit my pump? The kits are designed to fit the specific Goulds models listed: J5S/J5SH, J7S, GT10, and GT20. If you’re unsure of your model, contact our team and we’ll help you confirm.
My parts diagram lists a 5K6 seal ring and 5K162 diaphragm. Will these kits work? Yes. The 5K555-style seal ring and 5K557-style diaphragm are the new-style replacements for those older part numbers and are the correct current parts for your pump.
How long does a rebuild take? Most J Series and GT Series rebuilds take one to two hours for someone with basic mechanical experience and common hand tools.
Do you offer contractor or wholesale pricing? Yes — visit our wholesale page or contact our team for multi-unit pricing.