Monarch ACT 5 – 6 – 8 Series End Suction Centrifugal Pump & Repair Parts
The Monarch ACT Series end suction centrifugal pumps deliver reliable performance for pressure boosting and fluid transfer applications. Designed with a versatile frame mount configuration, these pumps accommodate either belt drive or direct drive setups through a flexible coupling, allowing seamless integration with the motor or engine of your choice.
Built with thick-wall cast gray iron casings and high-efficiency enclosed impellers, the ACT Series includes the ACT-5SD, ACT-6SD, and ACT-8SD models. Whether you need the corrosion-resistant glass filled noryl impellers of the 5SD and 6SD models or the rugged cast gray iron construction of the 8SD, this series provides durable solutions for agricultural, industrial, and pressure boosting systems.
Key Features and Benefits
- Versatile Drive Options: Frame mount design supports both belt drive and direct drive through flexible coupling, compatible with various motors and engines.
- Pressure Boosting Design: Thick-wall cast gray iron casing is specifically engineered for pressure boosting applications and high-pressure environments.
- Flexible Port Options: Available with discharge openings in 1″, 1¼”, and 2″ NPT sizes to match your system requirements.
- Reliable Sealing: Equipped with Buna and carbon ceramic mechanical seals for excellent leak prevention and chemical resistance.
- High-Efficiency Impellers: ACT-5SD and ACT-6SD feature glass filled noryl impellers for corrosion resistance, while ACT-8SD utilizes cast gray iron impellers for heavy-duty applications.
- Enclosed Impeller Design: Maximizes hydraulic efficiency and reduces maintenance requirements.
- Dual Speed Options: ACT-8SD available in both 3450 RPM and 1750 RPM configurations for flexible performance matching.
Applications
The Monarch ACT Series is engineered for demanding fluid handling tasks across multiple industries:
- Pressure Boosting Systems
- Agricultural Irrigation and Spraying
- Fertilizer and Chemical Transfer
- Industrial Water Systems
- Engine-Driven Pump Systems
- Commercial Water Transfer
Technical Specifications
Performance Chart
The following performance data shows total head in feet and corresponding capacities in U.S. GPM for each model configuration.
| Model No. | RPM | HP | Total Head in Feet Capacities in U.S. GPM |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 120 | 140 | |||
| ACT-5SD | 3450 | 2 | – | – | 65 | 62 | 58 | 53 | 47 | 39 | 30 | 15 | – |
| ACT-6SD | 3450 | 2½ | – | 92 | 87 | 84 | 79 | 73 | 66 | 58 | 48 | 15 | – |
| ACT-8SD | 3450 | 5 | – | 170 | 166 | 160 | 152 | 144 | 136 | 126 | 116 | 90 | 38 |
| ACT-8SD | 1750 | 1 | 78 | 56 | – | – | – | – | – | – | – | – | – |
ACT-SD Series Specifications
| Model No. | Order No. | Suction NPT | Discharge NPT | Ship Wt. (lbs.) | Transmission Data |
|---|---|---|---|---|---|
| ACT-5SD | 614992 | 1½” | 1″ | 16 | Shaft Size ¾” Keyway 3/16″ |
| ACT-6SD | 614993 | 1½” | 1¼” | 18 | Shaft Size ¾” Keyway 3/16″ |
| ACT-8SD | 614994 | 2″ | 2″ | 21 | Shaft assembly with sealed ball bearings |
Dimensional Specifications (Inches)
| Model | Suct. NPT |
Disch. NPT |
CP | DD | E | F | L | M | O | X | Y | ZC | ZO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ACT-5SD | 1½” | 1″ | 8.90 | 3.60 | 4.25 | 2.34 | 2 | 9.33 | 4.79 | 2.62 | 4.00 | 3.69 | |
| ACT-6SD | 1½” | 1½” | 9.28 | 4.06 | 4.25 | 2.46 | 2 | 10.81 | 6.31 | 2.88 | 4.72 | 8.84 | |
| ACT-8SD | 2″ | 2″ | 11.38 | 4.59 | 4.00 | 2 | 2.88 | 4 | 10.96 | 6.31 | 3.25 | 5.69 | 4.69 |
Repair Parts List
Maintain your Monarch ACT Series pump with genuine replacement parts. Use the reference numbers below to identify components for your specific model.
| Ref. # | Code # | -5SD Qty |
-6SD Qty |
-8SD Qty |
Description |
|---|---|---|---|---|---|
| 1 | 437842 | 1 | 1 | 1 | Casing |
| 1*** | 437839 | 1 | Casing | ||
| 2* | 433126 | 1 | Impeller | ||
| 2* | 433128 | 1 | Impeller | ||
| 2* | 437813 | 1 | Impeller | ||
| 7 | 437812 | 1 | 1 | 1 | Seal Plate |
| 9 | 226750 | 1 | 1 | 1 | Bolt 1/4″ UNC x 1″ |
| 10 | 266008 | 1 | 1 | 1 | Sleeve |
| 13 | 175000 | 1 | 1 | 1 | Washer Plain, 1/4 NOM |
| 15 | 164631 | 4 | Stud 3/8″ x 1-1/2″ | ||
| 15 | 164641 | 4 | 4 | 4 | Stud 3/8″ x 1-3/4″ |
| 23 | 176230 | 4 | 4 | 4 | Washer Spring 3/8 NOM |
| 24 | 227830 | 4 | 4 | 4 | Nut Hex 3/8″ |
| 25 | 185620 | 2 | 2 | 3 | Pipe Plug 1/4 |
| 26* | 193914 | 1 | Gasket | ||
| 26* | 193913 | 1 | Gasket | ||
| 26* | 198995 | 1 | O Ring #165 | ||
| 27 | 191791 | 1 | Flinger | ||
| 27 | 190847 | 1 | 1 | Flinger | |
| 31 | 240230 | 1 | Mechanical Seal | ||
| 32 | 240195 | 1 | 1 | Mechanical Seal | |
| 52 | 437871 | 1 | Transmission Housing | ||
| 52 | 437872 | 1 | Transmission Housing | ||
| 52 | 437851 | 1 | Transmission Housing | ||
| 53 | 438455 | 1 | Shaft | ||
| 53 | 437852 | 1 | Shaft (Ext. 1-29/64″) | ||
| 53 | 437854 | 1 | Shaft (Ext. 1-47/64″)** | ||
| 54 | 110216 | 2 | Ball Bearing | ||
| 56 | 137930 | 1 | 1 | Retaining Ring | |
| 57 | 137982 | 1 | Retaining Ring | ||
| 57* | 199245 | 1 | 1 | Lip Seal | |
| 58 | 400210 | 1 | 1 | 1 | Key 3/16 x 3/16 x 3/4″ |
| 59 | 432250 | 1 | Key 3/16 Sq. x 1″ (for Shaft #437852) | ||
| 59 | 432231 | 1 | Key 3/16 Sq. x 1-1/4″** (for Shaft #437854) | ||
| 60 | 185910 | 1 | 1 | 1 | Pipe Plug 1/8″ |