⚙️ 118709 Bell & Gossett Spring-Type Coupler – 1/2" x 5/8"
✅ Product Description
The 118709 Bell & Gossett Spring-Type Coupler is a high-quality cast iron coupler designed to connect motor shafts to pump shafts in PD-35, PD-37, 60 “AA”, and 1522 Series pumps where the motor shaft diameter is 5/8". Its spring-type design absorbs misalignment, reduces vibration, and dampens operational noise for smoother, quieter pump performance.
This coupler replaces Bell & Gossett P4Z-4291, P-4-Z-4291 and Armstrong 806137-000, making it a reliable service replacement for both legacy and current pump models.
✅ Key Features
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✅ Spring-Type Flexible Coupler – Reduces vibration and operational noise.
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✅ Durable Cast Iron Construction – Ensures long-lasting service life.
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✅ Direct Replacement – Replaces B&G P4Z-4291 / Armstrong 806137-000.
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✅ Fits Multiple Pumps – Used on PD-35, PD-37, 60 “AA”, and 1522 Series pumps.
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✅ OEM Quality – Reliable Bell & Gossett part for smooth pump operation.
📊 Specifications
| Specification | Detail |
|---|
| Part Number |
118709 |
| Material |
Cast Iron |
| Coupling Type |
Spring-Type |
| Size |
1/2" x 5/8" |
| Replaces |
P4Z-4291, P-4-Z-4291, Armstrong 806137-000 |
| Used On Pumps |
PD-35, PD-37, 60 “AA”, 1522 Series (motor shaft 5/8" diameter) |
| Application |
Motor-to-pump coupler |
| Brand |
Bell & Gossett |
⚠️ Common Symptoms (When Replacement Is Needed)
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Excessive vibration or rattling during pump operation.
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Misalignment between motor and pump shafts.
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Wear or cracking of the spring coupler.
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Noise or inefficient pump performance.
❓ Frequently Asked Questions (FAQ)
Q: Which pumps can use the 118709 coupler?
A: Fits PD-35, PD-37, 60 “AA” Series, and 1522 Series pumps with a 5/8" motor shaft.
Q: What parts does it replace?
A: Replaces Bell & Gossett P4Z-4291 / P-4-Z-4291 and Armstrong 806137-000.
Q: What is the coupler size?
A: The coupler measures 1/2" x 5/8".
Q: What is the benefit of the spring-type design?
A: It reduces vibration, dampens noise, and compensates for slight misalignment between motor and pump shafts.
🛒 Shopping Tips
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🔍 Confirm Pump Model and Motor Shaft Size – Ensure the motor shaft is 5/8" diameter.
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⚙️ Inspect During Maintenance – Check for wear or cracking if the pump is noisy or vibrating.
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📦 Stock Spare Couplers – For legacy pumps like Series 1522, keeping a spare reduces downtime.
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🛠️ Proper Installation – Ensure alignment during installation for optimal performance.
