Monarch BE-S33 Series Self Priming Effluent Pumps & Repair Parts
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Monarch BE-S33 1/3 HP Self-Priming Effluent Pump & Repair Parts
The Monarch BE-S33 is the foundation of the BE Series, offering robust performance in a compact, energy-efficient package. Designed as a 1/3 HP self-priming effluent pump, this model is specifically engineered for residential septic tank installations, basement sump drainage, and general liquid transfer. Built to last, the BE-S33 combines a heavy-duty cast iron housing with a high-service factor motor to deliver consistent results year after year.
This unit (Order No. 621805) operates on standard 115V power and features a semi-open impeller designed to handle effluent effectively. Whether you are replacing an existing unit or stocking up on maintenance components, this page provides full technical data, performance charts, and a comprehensive catalog of genuine Monarch repair parts.
Features and Benefits
- High-Efficiency Motor: The 1/3 HP motor is CSA-approved and continuous-duty rated. It features a high 1.95 Service Factor, providing extra power reserves for demanding cycles.
- Self-Priming Capability: Equipped with a built-in check valve, the pump primes quickly and prevents liquid from siphoning back, ensuring immediate response when water levels rise.
- Rugged Construction: The casing, seal plate, and impeller are crafted from durable cast iron, offering excellent heat dissipation and impact resistance.
- Protective Design: The motor includes automatic thermal overload protection and a stainless steel shaft. The “Blind Hole” impeller design prevents liquid contact with the shaft, eliminating corrosion risks.
- Reliable Sealing: Uses a proven Carbon/Ceramic 5/8″ mechanical seal to prevent leaks and ensure a long service life.
Applications
The BE-S33 is ideal for low-to-medium head applications including:
- Residential septic tank effluent removal
- Basement sump and dewatering systems
- Liquid transfer and drainage
- Flood irrigation
Technical Specifications
Ordering Information
| Model No. | Order No. | HP | SF | Ship Wt. (lbs.) | Voltage |
|---|---|---|---|---|---|
| BE-S33 | 621805 | 1/3 | 1.95 | 41 | 115 |
| BE-S50 | 621815 | 1/2 | 1.90 | 42 | 115/230 |
| BE-S75 | 621825 | 3/4 | 1.65 | 43 | 115/230 |
Electrical Data (BE-S33)
- Voltage: 115V (Single Phase)
- Full Load Amps: 9.4 Amps
- Motor Type: Dual compartment, square flange or C-face (depending on vintage)
Performance Chart (Capacities in U.S. GPM)
| Model No. | Total Head in Feet | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | |
| BE-S33 | 36 | 30 | 23 | 16 | 9 | 2 | – | – | – |
| BE-S50 | 45 | 39 | 31 | 24 | 16 | 8 | – | – | – |
| BE-S75 | 58 | 53 | 44 | 36 | 29 | 18 | 10 | 1 | – |
Dimensions (Inches)
| Model | Suct. NPT | Disch. NPT | Priming Plug NPT | Drain Plug NPT | Slots | A | B | C | D | E | F | G | H | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BE-S33 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 14.4 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
| BE-S50 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 15.3 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
| BE-S75 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 15.6 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
Repair Parts List – Type “TM”
| Ref. # | Code # | Qty. | Description | |
|---|---|---|---|---|
| BE-S33 | BE-S50 | |||
| 1 | 438391 | 1 | 1 | Casing |
| 2 | 438091 | 1 | Impeller (BE-S33) | |
| 2 | 438101 | 1 | Impeller | |
| 4 | 438245 | 1 | 1 | Mounting Bracket |
| 5 | 438241 | 1 | 1 | Seal Plate |
| 6 | 438412 | 1 | 1 | Flange |
| 7 | 201056 | 1 | 1 | Check Valve Assembly |
| 9 | 246800 | 1 | 1 | 5″ Edge Trim |
| 21 | 120030 | 4 | 4 | Bolt 3/8 UNC x 1 1/2 |
| 24 | 119780 | 2 | 2 | Bolt 5/16 UNC x 1 |
| 34 | 176540 | 4 | 4 | Spring Washer 3/8 |
| 35 | 174220 | 2 | 2 | Aluminum Washer |
| 38 | 185640 | 2 | 2 | Pipe Plug 1/2 NPT |
| 39* | 193920 | 1 | 1 | Gasket |
| 40* | 191790 | 1 | 1 | Flinger |
| 43 | 438413 | 1 | 1 | Gasket |
| 45 | 240104 | 1 | 1 | Seal 5/8 dia. |
| 50 | 204081 | 1 | 1/3 HP Electric Motor, Sq. Flange | |
| 1 | 1/2 HP Electric Motor, Sq. Flange | |||
Repair Parts List – Type “A”
Model Key for Table Below:
a= BE33 | b= BE-S33 | c= BE50 | d= BE-S50 | e= BE-S75
BE33-B | BE-S33-B | BE50-B | BE-S50-B | BE-S75-B
BE33-SP | BE-S33-SP | BE50-SP | BE-S50-SP | BE-S75-SP
| Ref. # | Code # | a | b | c | d | e | Description |
|---|---|---|---|---|---|---|---|
| 1 | 204070 | 1 | Motor 1/3 HP C face | ||||
| 1 | 204071 | 1 | Motor 1/3 HP Sq. flange | ||||
| 1 | 204110 | 1 | Motor 1/2 HP C face | ||||
| 1 | 204073 | 1 | Motor 1/2 HP Sq. flange | ||||
| 1 | 204125 | 1 | Motor 3/4 HP Sq. flange | ||||
| 2 | 246800 | 1 | 1 | 1 | 1 | 1 | Edge trim |
| 3 | 438245 | 1 | 1 | 1 | 1 | 1 | Base |
| 4 | 119990 | 4 | 4 | Bolt 3/8 UNC x 3/4 | |||
| 4 | 120030 | 4 | 4 | 4 | Bolt 3/8 UNC x 1 1/2 | ||
| 5 | 175500 | 4 | 4 | Aluminum washer | |||
| 5 | 176230 | 4 | 4 | 4 | Spring washer 3/8 | ||
| 6 | 191790 | 1 | 1 | 1 | 1 | 1 | Flinger |
| 7 | 438240 | 1 | 1 | Seal plate | |||
| 7 | 438241 | 1 | 1 | 1 | Seal plate | ||
| 8 | 240104 | 1 | 1 | 1 | 1 | 1 | Mechanical seal 5/8 I.D. |
| 9 | 438090 | 1 | Impeller 7/16 UNC; .20 vane height | ||||
| 9 | 438092 | 1 | Impeller 1/2 UNC; .20 vane height | ||||
| 9 | 438100 | 1 | Impeller 7/16 UNC; .30 vane height | ||||
| 9 | 438105 | 1 | Impeller 1/2 UNC; .25 vane height | ||||
| 9 | 438106 | 1 | Impeller 1/2 UNC ; .35 vane height | ||||
| 10 | 193920 | 1 | 1 | 1 | 1 | 1 | Gasket |
| 11 | 438390 | 1 | 1 | Casing | |||
| 11 | 438492 | 1 | 1 | 1 | Casing – yellow (B.C. dia. for motor – 7.13) | ||
| 12 | 227810 | 1 | 1 | 1 | 1 | 1 | Nut 1/4 UNC |
| 13 | 238330 | 1 | 1 | 1 | 1 | 1 | Top weight |
| 14 | 194390 | 1 | 1 | 1 | 1 | 1 | Checkvalve |
| 15 | 186540 | 2 | 2 | 2 | 2 | 2 | Pipe plug 1/2 NPT |
| 16 | 438415 | 1 | 1 | 1 | 1 | 1 | Checkvalve body |
| 18 | 174220 | 2 | 2 | 2 | 2 | 2 | Aluminum washer 5/16″ |
| 19 | 119780 | 2 | 2 | 2 | 2 | 2 | Bolt 5/16″ UNC x 1″ |
| 20 | 225720 | 1 | 1 | 1 | 1 | 1 | Bolt 1/4″ UNC x 5/8″ |
Models / Parts with Suffix “-B”
| Ref. # | Code # | Description |
|---|---|---|
| 633738 | 1 | Float switch |
| 435021 | 1 | Cord assembly 8 ft. |
Models / Parts with Suffix “-SP”
| Ref. # | Code # | Description |
|---|---|---|
| 225070 | 1 | Sump pump switch |
| 435021 | 1 | Cord assembly 8 ft. |
| 435022 | 1 | Cord assembly 5 ft. |
| 463763 | 1 | Float Kit |
FAQs
Is the Monarch BE-S33 pump dual voltage?
No, the BE-S33 (1/3 HP) is wired for 115V single-phase operation. If you require a dual voltage pump (115/230V), consider the BE-S50 or BE-S75 models.
What is the maximum head capacity of the BE-S33?
The BE-S33 has a maximum head of approximately 45 feet. It can pump 36 GPM at 20 feet of head and 9 GPM at 40 feet of head.
What is the difference between column ‘a’ and ‘b’ in the parts list?
Column ‘a’ refers to the model BE33, while column ‘b’ refers to model BE-S33. The primary difference is often the motor mounting type (C-face vs. Square flange) and specific impeller threading. Ensure you check your pump’s nameplate to select the correct column.
Does this pump require a check valve?
The BE-S33 comes with a built-in check valve to assist with priming and prevent backflow. However, for long vertical runs or specific code requirements, an additional external check valve may be recommended in the discharge line.