Monarch NT3M9 End Suction Centrifugal Pump & Repair Parts
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The Monarch NT3M9 Series of frame mount end suction centrifugal pumps is engineered for high-durability industrial and agricultural applications. Constructed with an “All Iron” design, these pumps are versatile workhorses suitable for belt drive, power take-off (PTO) drive, or direct drive configurations through a flexible coupling.
Designed for reliability in harsh environments, the NT3M9 seal models are equipped with an iron wear ring, a Viton mechanical seal, and a stainless steel shaft sleeve. These features make the NT3M9 Series ideal for liquid ag-chemical bulk loading plants and use on water trucks where resistance to corrosion and wear is critical.
Key Features and Benefits
- Rugged Casing: Cast gray iron construction with a back pull-out design allows for quick and easy access to the impeller without disturbing suction and discharge piping.
- High-Efficiency Impeller: Dynamically balanced cast iron impeller, specifically designed for maximum pumping efficiency.
- Fatigue-Proof Shaft: One-piece, high-strength fatigue-proof steel shaft (1 1/8″ diameter) features a keyway for positive connections.
- Premium Seals: Mechanical seals are Viton and stainless steel in All Iron (AI) models, ensuring chemical resistance. Optional gland packing is available.
- Stainless Steel Shaft Sleeve: Designed to prevent shaft wear and corrosion, extending the lifespan of the pump.
- Heavy-Duty Bearings: Single row deep groove bearings ensure minimum shaft deflection and reduced maintenance requirements.
- Rotation Options: Available in standard rotation and counter-clockwise (CCW) configurations.
Applications
The Monarch NT3M9 Series is specifically built to handle demanding fluid transfer tasks, including:
- Liquid Agricultural Chemical Bulk Loading
- Water Trucks and Spraying Systems
- Sump and Sewage Management
- Industrial Water Systems
- Lawn and Sprinkler Irrigation
Technical Specifications
Performance Chart
The following chart details the total head in feet at a 5 ft. suction lift and capacities in U.S. GPM.
| RPM | HP Required | Total Head in Feet at 5 Ft. Suction Lift Capacities in U.S. GPM |
Max. Head at Shut-off in Ft. (PSI) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 50 | 60 | 70 | 80 | 130 | 140 | 150 | 160 | 170 | |||
| 2600 | 40 | – | – | – | – | – | 930 | 890 | 810 | 700 | 510 | 175 Ft. (75 PSI) |
| 1750 | 13 | 830 | 750 | 650 | 530 | 200 | – | – | – | – | – | 82 Ft. (35 PSI) |
NT3M9 Series Model Specifications
| Model No. | Order No. | Suction NPT | Discharge NPT | Ship Wt. (lbs.) | Description |
|---|---|---|---|---|---|
| NT3M9S-AI-NPT | 614597 | 4″ NPT | 3″ NPT | 128 | Std. rotation, all iron mechanical seal |
| NT3M9P-AI-NPT | 614596 | Std. rotation, all iron gland packing | |||
| NT3M9S-CCW-NPT | 614594 | CCW rotation, all iron mechanical seal | |||
| NT3M9P-CCW-NPT | 614595 | CCW rotation, all iron gland packing | |||
| NT3M9P-CCW-VIC | 614506 | 4″ Victaulic | 3″ Victaulic | 128 | CCW rotation, gland packing, victaulic ports |
| NT3M9S-CCW-VIC | 614507 | CCW rotation, mechanical seal, victaulic ports | |||
| Hydraulic Adapter | 612880 | – | – | – | Includes bracket and coupling used to couple hydraulic motor with SAE J744C mounting flange to NT3M9 pump or EP series TR-1 frame. |
Repair Parts List
Identify the correct replacement parts for your specific model using the table below. The columns correspond to the following models:
- A) NT3M9P
- B) NT3M9S
- C) NT3M9P – CCW
- D) NT3M9S – CCW
| Ref.# | Code # | A (Qty) | B (Qty) | C (Qty) | D (Qty) | Description |
|---|---|---|---|---|---|---|
| 1 | 400240 | 1 | 1 | Casing Type A | ||
| 1 | 400200 | 1 | 1 | Casing Type A | ||
| 1 | 400280 | 1 | 1 | Casing Type B, C & D | ||
| 1 | 400259 | 1 | 1 | Casing | ||
| 2 | 400273 | 1 | 1 | Impeller – Full dia. 9″ | ||
| 2 | – | 1 | 1 | Trimmed impeller (see **) | ||
| 2 | 400281 | 1 | 1 | Impeller – Full dia. 9″ Type F | ||
| 2 | – | 1 | 1 | Trimmed impeller (see **) | ||
| 2 | 400205 | 1 | 1 | Impeller CCW – Full dia. 9″ | ||
| 3 | 190121 | 1 | 1 | 1 | 1 | Wear Ring Type B, C & D |
| 3AI | 400123 | 1 | 1 | 1 | 1 | Wear Ring |
| 4 | 400201 | 1 | 1 | 1 | 1 | Transmission Head Type A, B & C |
| 4 | 400202 | 1 | 1 | 1 | 1 | Transmission head Type D, E |
| 5 | 400203 | 1 | 1 | Water Gland Set Split | ||
| 5AI | 400204 | 1 | 1 | Water Gland Set Split | ||
| 6 | 400206 | 1 | 1 | Packing cover | ||
| 7 | 400418 | 1 | 1 | Seal Cover | ||
| 8 | 426213 | 1 | 1 | 1 | 1 | End cover Type E, F |
| 12 | 400247 | 1 | 1 | Shaft (Note 2) | ||
| 12 | 400271 | 1 | 1 | Shaft (Note 2) | ||
| 13 | 400197 | 1 | 1 | Washer ID 15/32 OD 1 7/16 | ||
| 13 | 400279 | 1 | 1 | Washer ID 17/32 OD 1 9/16 | ||
| 14* | 266012 | 1 | 1 | 1 | 1 | Sleeve |
| 15* | 190838 | 1 | 1 | 1 | 1 | Gasket |
| 16* | 190849 | 1 | 1 | 1 | 1 | Flinger |
| 17 | 190851 | 1 | 1 | 1 | 1 | Gasket |
| 18 | 432082 | 1 | 1 | 1 | 1 | Key |
| 19 | 432290 | 1 | 1 | 1 | 1 | Key |
| 21* | 240090 | 1 | 1 | Mechanical Seal | ||
| 21AI | 240362 | 1 | 1 | Mechanical Seal | ||
| 22 | 432560 | 5 | 5 | Packing Ring | ||
| 23* | 110245 | 2 | 2 | 2 | 2 | Ball Bearing |
| 25 | 119530 | 4 | 4 | 4 | 4 | Bolt 1/4×3/4 |
| 25 | 120450 | 4 | 4 | Bolt 1/2×1 1/2 | ||
| 25 | 226651 | 4 | 4 | Bolt 1/2×1 1/2 LOK | ||
| 26 | 119780 | 6 | 6 | 6 | 6 | Bolt |
| 27 | 120050 | 2 | 2 | Bolt | ||
| 28 | 120238 | 8 | 8 | 8 | 8 | Bolt |
| 29* | 226421 | 1 | 1 | Bolt | ||
| 29* | 130655 | 1 | 1 | Nut Type E (CCW) | ||
| 31 | 185620 | 3 | 3 | 3 | 3 | Pipe Plug |
| 32 | 185640 | 2 | 2 | 2 | 2 | Pipe Plug |
| 34 | 176520 | 4 | 4 | 4 | 4 | Spring Washer Type A, B & C |
| 35 | 176530 | 6 | 6 | 6 | 6 | Spring Washer |
| 101 | 400750 | 1 | 1 | 1 | 1 | Flange (Note 1) |
| 103 | 190910 | 1 | 1 | 1 | 1 | Gasket (note 1) |
Frequently Asked Questions
What is the construction material of the Monarch NT3M9 Series?
The Monarch NT3M9 Series features “All Iron” construction, including a cast gray iron casing and dynamically balanced cast iron impeller, making it highly durable for industrial use.
What drive types are compatible with the NT3M9 pump?
These pumps are suitable for belt drive, power take-off (PTO) drive, or direct drive configurations through a flexible coupling.
Can the NT3M9 pump handle agricultural chemicals?
Yes, the NT3M9 is ideal for liquid ag-chemical bulk loading. The seal models are equipped with Viton mechanical seals and stainless steel shaft sleeves to resist corrosion.
What is the connection size for the NT3M9 pumps?
The NT3M9 Series features a 4″ NPT Suction and a 3″ NPT Discharge. Victaulic port options are also available on specific CCW models.