Monarch Industries ACE-S75SD Series Centrifugal Pump Square Flange & Repair Parts
Monarch Industries ACE-S75SD (3/4 HP) Square Flange Centrifugal Pump
The Monarch Industries ACE-S75SD is a versatile 3/4 HP End Suction Centrifugal Pump designed to deliver reliable performance for residential and light commercial water systems. As part of the premium ACE-S Series, this model combines the durability of cast iron with the efficiency of a Square Flange motor and advanced impeller technology.
Unlike standard centrifugal pumps that use rough cast iron impellers, the ACE-S75SD features a precision-engineered, enclosed glass-filled Noryl impeller reinforced with a stainless steel hub. This design creates an exceptionally smooth waterway, increasing efficiency and pressure while resisting corrosion. Housed in a thick-wall cast gray iron casing, the ACE-S75SD is built to withstand the rigors of daily irrigation boosting and water transfer duties.
Key Features
- 3/4 HP Efficiency: Powered by a 3600 RPM, single-phase, Square Flange motor (Dual Voltage 115/230V) with built-in thermal overload protection.
- Composite Impeller: The glass-filled Noryl impeller offers superior hydraulic performance and resistance to abrasion compared to standard metal impellers.
- Square Flange Design: Utilizes a standard Square Flange motor mount, allowing for easy serviceability and secure motor-to-pump alignment.
- Moisture Defense: Equipped with a shaft flinger and a large drain hole in the adapter bracket to protect the motor bearings from water intrusion.
- Reliable Sealing: Features a standard Buna/Carbon-Ceramic mechanical seal (MS-25) for long-lasting, leak-free operation.
- Winterizing Ready: Includes accessible drain plugs to easily drain the casing and prevent frost damage during colder months.
Common Applications
The ACE-S75SD provides the ideal balance of flow and pressure for:
- Residential Irrigation: Powering average-sized lawn sprinkler systems with consistent pressure.
- Water Transfer: Moving water from storage tanks, ponds, or cisterns.
- Booster Service: Increasing water pressure for household or garden use.
- General Lift Applications: Capable of lifting water efficiently for various utility needs.
Technical Specifications & Performance
Performance Chart
| HP | Model | 20 ft | 30 ft | 40 ft | 50 ft | 60 ft | 70 ft | 80 ft |
|---|---|---|---|---|---|---|---|---|
| 3/4 | ACE-S75SD | 55 | 52 | 47 | 38 | 32 | 25 | 15 |
Model Specifications
| Model No. | Order No. | HP | Suct. NPT | Disch. NPT | Electrical Characteristics | Ship Wt. (lbs.) |
|---|---|---|---|---|---|---|
| ACE-S75SD | 614562 | 3/4 | 1-1/4″ | 1″ | 1/60/115/230V | 32 |
Description: Single phase motor with built-in thermal overload protection. Stainless steel shaft or replaceable sleeve.
Dimensions
| Model | Suction | Discharge | CP | D | E | F | H | L | M | N | OP | X | Y |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ACE-S75SD | 1-1/4″ | 1″ | 14.07 | 4.00 | 4.88 | 3.00 | 7/16×15/16 | 5.53 | 3.69 | 4.00 | 8.90 | 4.90 | 2.63 |
Repair Parts
| Ref. | Code # | Qty. | Description |
|---|---|---|---|
| 1 | 437842 | 1 | Casing (Fits 1/2 HP – 1 HP) |
| 2 | 433107 | 1 | Impeller (Glass Filled Noryl) |
| 3 | 437890 | 1 | Seal Plate |
| 4 | 438245 | 1 | Bracket |
| 5 | 246801 | 1 | End Cap |
| 15 | 164651 | 2 | Stud 3/8″ x 2″ |
| 16 | 164641 | 2 | Stud 3/8″ x 1 3/4″ Zn Pl. |
| 17 | 227830 | 4 | Nut Hex. 3/8 UNC Zn. Pl. |
| 18 | 227830 | 4 | Nut Hex. 3/8″ Zn. Pl. |
| 23 | 176230 | 4 | Spring Washer 3/8″ Zn Pl. |
| 25 | 185620 | 2 | Pipe Plug 1/4″ NPT Zinc Plated |
| 26* | 193914 | 1 | Gasket (Fits 1/2 HP – 1 HP) |
| 27* | 191790 | 1 | Flinger |
| 31* | 240250 | 1 | Mech. Seal MS-25 |
| 34 | 204125 | 1 | Motor 3/4HP 1Ø 115/230V |
Frequently Asked Questions
Is the impeller on the ACE-S75SD interchangeable with the 1/2 HP model?
No. While they share the same casing, the 3/4 HP model uses Impeller #433107, which is specifically sized to utilize the motor’s higher horsepower for better performance.
What is the advantage of the Glass Filled Noryl impeller?
Glass Filled Noryl is an engineered thermoplastic that creates a much smoother surface than cast iron. This smooth surface reduces friction, which improves efficiency and water flow. It is also highly resistant to corrosion.
Can I wire the ACE-S75SD for 230 Volts?
Yes, the 3/4 HP motor included with the ACE-S75SD is dual voltage. It can be configured for either 115V or 230V depending on your available power supply.
What mechanical seal does this pump use?
The ACE-S75SD uses the standard MS-25 mechanical seal, part #240250, which is a 5/8″ Type 6 seal.