Allparts Equipment & Accessories Allparts DW3635 Triplex Pump vs Allparts Equipment & Accessories Allparts AAA Triplex Replacement: Spec Comparison
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This comparison looks at the allparts equipment accessories allparts dw3635 triplex pump vs the Allparts AAA Triplex Replacement. Both units are horizontal triplex plunger pumps rated for 3600 PSI. They share the same pressure capacity but differ in flow rate. The DW3635 delivers 3.5 GPM, while the AAA model provides 2.5 GPM. You also need to check shaft size compatibility, as one uses a 1-inch shaft and the other uses a 3/4-inch shaft. These specs determine which pump fits your engine and cleaning needs.
Key differences
| Aspect | Allparts DW3635 Triplex Pump | Allparts AAA Triplex Replacement Pump |
|---|---|---|
| Flow Rate | 3.5 GPM | 2.5 GPM |
| Shaft Size | 1 inch | 3/4 inch |
| Weight | 18 pounds | 16 pounds |
| Dimensions | 11 x 9 x 11 inches | not listed |
| Color | Grey | Black |
| Easy-Start System | not listed | Yes |
Which one should you choose?
Choose Allparts DW3635 Triplex Pump if
- You need higher water flow for faster cleaning on large areas
- Your engine has a 1-inch hollow shaft
- You prefer a pump with listed physical dimensions for fitment checks
Choose Allparts AAA Triplex Replacement Pump if
- You want an easier start with the built-in EZ Start system
- Your engine has a 3/4-inch hollow shaft
- You prefer a lighter pump at 16 pounds
Verdict: Choose the DW3635 if you need more water flow and have a 1-inch shaft. Pick the AAA model if you have a 3/4-inch shaft or value the easy-start feature. Both pumps handle 3600 PSI, so your engine shaft and flow needs dictate the choice.
DW3635 vs AAA Pump Specs
Flow rate comparison
The Allparts DW3635 Triplex Pump delivers 3.5 gallons per minute at maximum pressure. This higher flow rate moves more water, which helps rinse away debris faster during heavy cleaning tasks. The Allparts AAA Triplex Replacement Pump is rated at 2.5 GPM. While it still reaches 3600 PSI, the lower flow means it relies more on pressure than volume for cleaning. If your work involves rinsing large areas like driveways or decks, the DW3635 provides a distinct advantage. The AAA model is better suited for jobs where high pressure is more important than rapid water volume.
Shaft compatibility
Shaft size determines which engine you can mount the pump to. The DW3635 features a 1-inch hollow shaft. This requires a specific engine with a matching 1-inch input shaft. The Allparts AAA Triplex Replacement uses a 3/4-inch hollow shaft. This smaller size fits a wider range of standard horizontal engines found on many pressure washer frames. If you are replacing a pump on an existing machine, you must match the shaft diameter exactly. The AAA model offers broader compatibility for common engine sizes, while the DW3635 is strictly for 1-inch shaft applications.
Build materials
Durability often depends on internal components. The Allparts AAA Triplex Replacement includes a brass pump head to resist corrosion and wear. It also features polished ceramic-coated pistons and dual oversized ball bearings to reduce friction. These details suggest a focus on long-term reliability and smoother operation. The DW3635 data lists a triplex plunger design but does not specify the head material or coating details. Without explicit data on the DW3635 internals, the AAA model has a clear advantage in documented build quality features that support longevity.
Ease of start
Starting a pressure washer pump can be difficult without proper features. The Allparts AAA Triplex Replacement includes a built-in easy-start system. It has a fully adjustable EZ Start unloader system and an ergonomic control handle. This allows you to fine-tune output pressure and start the pump effortlessly, even if you are a first-time user. The DW3635 description mentions easy mounting but does not list an unloader system or easy-start mechanism in its features. This makes the AAA model significantly more user-friendly for initial setup and daily operation.
Oil monitoring
Proper oil maintenance is critical for pump life. The Allparts AAA Triplex Replacement features an oil sight glass. This allows you to see the oil level and check for water contamination without removing a dipstick. It uses advanced oil seal technology to keep the oil clean. The DW3635 data does not mention an oil sight glass or specific monitoring features. You would need to rely on other methods to check the oil level on the DW3635. The AAA model provides a practical advantage for routine maintenance checks.
Physical dimensions
Space constraints matter when fitting a pump into a frame. The DW3635 measures 11 inches in length, 11 inches in width, and 9 inches in height. It weighs 18 pounds. The Allparts AAA Triplex Replacement weighs 16 pounds. The data for the AAA model does not list specific length, width, or height dimensions. The DW3635 is slightly heavier. If you need to know the exact footprint for a tight frame, the DW3635 provides complete dimensional data, while the AAA model’s size is unspecified. This is a tie in practical terms since you cannot fully compare the footprint.
Choose the right pump for your needs
You need high volume for rinsing large areas
The DW3635 delivers 3.5 GPM at 3600 PSI. This higher flow rate moves more water than the 2.5 GPM model. It helps rinse away debris faster during heavy cleaning tasks. If your priority is speed and volume over low water usage, this triplex plunger pump is the better fit for demanding jobs.
You want ease of use and installation
The AAA replacement comes fully plumbed with hoses and fittings. It features a built-in easy-start system with an adjustable unloader. The oil sight glass allows you to check levels without a dipstick. These features make installation quick and operation effortless, even for first-time users handling paint removal or grime.
You have a 3/4 inch shaft engine
The AAA Triplex Replacement Pump is designed for a 3/4 inch hollow shaft. It fits most horizontal engines with this standard size. The DW3635 requires a 1 inch shaft. If your engine uses a 3/4 inch connection, this pump ensures proper compatibility and direct drive integration without needing adapters.
The products compared
Allparts DW3635 Triplex Pump
Best for: Replacing horizontal triplex pumps on 1-inch shafts
- Maximum Pressure
- 3600 PSI
- Flow Rate
- 3.5 GPM
- Pump Type
- Triplex plunger
- Dimensions
- 11 × 11 × 9 inches
- Weight
- 18 pounds
View on Amazon: Allparts DW3635 Triplex Pump Affiliate link
The Allparts DW3635 is a horizontal triplex plunger pump rated at 3600 PSI and 3.5 GPM. It mounts to 1-inch hollow shaft engines using an SAE bolt pattern. This grey unit weighs 18 pounds and measures 11 inches in length and width. It suits users needing direct-drive replacement parts for high-pressure cleaning tasks.
Pros
- Rated for 3600 PSI maximum pressure
- Delivers 3.5 GPM flow rate at 3400 RPM
- Horizontal triplex plunger design for durability
- Fits 1-inch hollow shaft engines
Cons
- Limited to 3600 PSI compared to higher-end models
- Fixed 3.5 GPM flow rate
- Requires manual compatibility verification
Good fit if
- You need a direct replacement for a horizontal triplex pump
- Your engine uses a 1-inch hollow shaft
- You prefer an SAE bolt pattern for mounting
Skip if
- You require a vertical pump configuration
- You need a flow rate higher than 3.5 GPM
- You want a pump with integrated electronic controls
Verdict: The Allparts DW3635 3600 PSI Triplex Pump is a solid choice for replacing worn horizontal triplex units on 1-inch shaft engines. It fits users who prioritize standard SAE mounting and reliable 3600 PSI output.
Allparts AAA Triplex Replacement Pump
Best for: Replacing horizontal 3/4 inch shaft pumps
- Maximum Pressure
- 3600 PSI
- Flow Rate
- 2.5 GPM
- Pump Type
- Triplex Plunger
- Color
- Black
- Weight
- 16 pounds
View on Amazon: Allparts AAA Triplex Replacement Pump Affiliate link
This Allparts DWD2536 is a horizontal triplex plunger pump rated for 3600 PSI and 2.5 GPM. It features a brass pump head and ceramic-coated pistons for durability. The unit includes an adjustable unloader system and comes fully plumbed for quick installation. Weighing 16 pounds, it fits most horizontal 3/4 inch shaft engines. This pump balances cleaning power with water usage for steady performance.
Pros
- 3600 PSI burst pressure handles tough grime
- Brass pump head resists corrosion and wear
- Fully plumbed kit with hoses and fittings
- Adjustable EZ Start unloader system
Cons
- 2.5 GPM flow rate is lower than competitors
- 16 pound weight adds bulk
- No remote control included
Good fit if
- You need a reliable replacement for a 3/4 inch shaft engine
- You want a fully plumbed pump for quick installation
- You prefer a horizontal triplex plunger design
Skip if
- You require a flow rate higher than 2.5 GPM
- You need a vertical pump configuration
- You want a lighter unit under 16 pounds
Verdict: Allparts DWD2536 3600 PSI Pump is a solid choice for users replacing a horizontal pump who prioritize durability over maximum flow rate. It suits those who need a straightforward, fully plumbed unit for standard pressure washer engines.
Specifications side by side
| Spec | Allparts DW3635 Triplex Pump | Allparts AAA Triplex Replacement Pump |
|---|---|---|
| Maximum Pressure | 3600 PSI | 3600 PSI |
| Flow Rate | 3.5 GPM | 2.5 GPM |
| Pump Type | Triplex plunger | Triplex Plunger |
| Pressure | not stated | 3600 PSI |
| Color | Grey | Black |
| Dimensions | 11 × 11 × 9 inches | not stated |
| Weight | 18 pounds | 16 pounds |
| Model | DW3635 | DWD2536 |
Frequently asked questions
Which Allparts pump fits a 1-inch shaft engine?
The Allparts DW3635 Triplex Pump is designed for 1-inch shaft engines. It replaces worn horizontal triplex units that use standard SAE mounting. This specific shaft compatibility ensures it fits your engine correctly without needing adapters or modifications.
What is the flow rate of the DW3635 pump?
The DW3635 delivers 3.5 gallons per minute at 3600 PSI. This higher flow rate moves more water than the 2.5 GPM model. It helps rinse away debris faster during heavy cleaning tasks compared to lower flow alternatives.
Does the AAA replacement pump have a flow rate spec?
Yes, the Allparts AAA Triplex Replacement Pump has a flow rate of 2.5 GPM. This lower flow rate prioritizes durability over maximum water volume. It suits users who need a straightforward unit for standard pressure washer engines.
How heavy is the DW3635 pump?
The DW3635 weighs 18 pounds. It measures 11 inches in length, 11 inches in width, and 9 inches in height. These dimensions and weight make it a substantial replacement for horizontal triplex pumps on compatible engines.
What color is the AAA replacement pump?
The Allparts AAA Triplex Replacement Pump is black. This color distinguishes it from the grey DW3635 model. Both pumps are horizontal triplex plunger units rated for 3600 PSI, but the visual finish differs between the two options.
Can the DW3635 replace a 3/4 inch shaft pump?
No, the DW3635 is built for 1-inch shafts. The AAA Triplex Replacement is better suited for replacing horizontal 3/4 inch shaft pumps. You must match the shaft size to ensure proper installation and operation of your pressure washer.
What is the model number for the AAA pump?
The model number for the AAA replacement is DWD2536. It is often listed under the Allparts AAA Triplex Replacement name. This model provides 3600 PSI pressure and 2.5 GPM flow for standard horizontal engine applications.
Which pump is better for rinsing large areas?
The DW3635 is better for rinsing large areas due to its 3.5 GPM flow rate. Higher flow moves more water, which rinses debris faster. The AAA pump’s 2.5 GPM is slower, making the DW3635 the superior choice for volume.