Detroit RA4722002001 Variable Speed Water Pump – DD13 DD15 Remanufactured

The Detroit RA4722002001 is a genuine factory remanufactured variable speed water pump (coolant pump) for Detroit Diesel DD13 and DD15 engines. This advanced electro-viscous pump features a viscous clutch between the pulley and impeller drive, allowing the engine control module (ECM) to command reduced impeller speed when conditions allow—improving fuel efficiency compared to traditional fixed-speed pumps. Factory remanufactured by Detroit Diesel to meet original equipment specifications, this pump includes all necessary gaskets and seals for a complete installation.

Signs You Need a New Water Pump

• Coolant leaking from the weep hole or pump housing
• Engine overheating or running hotter than normal
• Check engine light with coolant temperature or water pump fault codes
• Unusual noise or whining from the water pump area
• Visible coolant residue or staining around the pump
• Variable speed pump not responding to ECM commands
• Impeller speed sensor faults or communication errors

Specifications

Cross References

This part replaces or is equivalent to the following part numbers:

• Detroit Diesel (New): EA4722002001, A4722002001, 4722002001
• Detroit Diesel (Reman): RA4722002001, RA4722001601, RA4722000701
• Detroit Diesel (Superseded): EA4722001601, A4722001601, EA4722000701, A4722000701
• Detroit Diesel (Earlier): EA4712001101, A4712001101, EA4712000901, A4712000901, EA4712001601, A4712001601
• Detroit Diesel (Base): 4712000901, 4712001101, 4712001601, 4722000701, 4722001601
• Mercedes-Benz: A4702000201, A4712000901, A4722000701, A4722001601
• Alliant Power: AP63509
• Other: 167-020-0018, 1670200018, Y0701005, RE2324-04, RE2324-05, 701012AT

Applications

This variable speed water pump fits Detroit DD13 and DD15 engines in:

• Freightliner Cascadia: 2008-2022
• Freightliner Cascadia 126: 2017-2022
• Western Star 5700XE: 2016-2022
• Western Star 49X: 2020-2022

Variable Speed Water Pump Technology

The Detroit variable speed water pump represents advanced cooling system technology designed for maximum fuel efficiency:

• Viscous Clutch Design: Located between the pulley and impeller drive, allowing the ECM to reduce impeller speed when full cooling capacity isn't needed
• Closed-Loop Control: Impeller speed sensor communicates with the ECM for precise, real-time pump speed adjustment
• Fail-Safe Operation: In case of electrical fault or broken circuit, the pump defaults to full impeller speed to protect the engine
• Fuel Efficiency: Reduces parasitic power loss compared to traditional fixed-speed pumps that always run at engine speed
• Optimized Cooling: Provides exact coolant flow needed based on engine temperature, load, and ambient conditions

Why Choose Detroit Remanufactured

• Factory Remanufactured: Rebuilt by Detroit Diesel to original equipment specifications
• OEM Quality: Uses genuine Detroit components and meets all original performance standards
• Complete Assembly: Includes all necessary gaskets, seals, and sensors for installation
• Warranty Coverage: Backed by Detroit Diesel remanufactured parts warranty
• Cost Effective: Premium quality at a lower cost than new OEM

Important: This is a variable speed (viscous/electro-viscous) water pump controlled by the ECM. It is NOT interchangeable with manual/fixed-speed water pumps (A4722000401, A4722000101). Verify your engine requires a variable speed pump before ordering. A core return is required—see core charge details.

Handling Time
At All Pro Truck Parts we do our best to ship all orders same day for orders placed before 12:00pm Central Standard Time. Same day shipment is never guaranteed. For standard UPS or USPS shipping, you will typically receive your package in 1 - 5 business days. Shipping times are never guaranteed and All Pro Truck Parts is not responsible for lost or delayed shipments by the carrier. Carrier times vary by distance from shipment origin and may change without prior notice. Shipping price is calculated from package dimensions and weight. Calculated rates for orders will be available at checkout. Orders placed after 12:00pm CST on Fridays will not be fulfilled until the following business day, Monday morning barring a holiday.

Next Day Air Shipments
The cutoff time for UPS Next Day Air is 12:00PM. If you have missed the cutoff time but would still like to place an order for Next Day delivery, please send us a text message or email. We can try to accommodate and ship your order from another warehouse.

Incorrect Shipping prices
All Pro Truck Parts reserve the right to cancel any order, in the event shipping rates are calculated incorrectly at checkout. We will notify you at your provided contact information to give you the option to pay the correct amount, or allow you to cancel the order for a full refund. 

Free Shipping
Select products qualify for free shipping. Qualifying product groups can change without notice. Free shipping will be shipped via UPS Ground, USPS First Class or USPS Priority Mail.  

Domestic Shipping Services

• USPS Domestic Shipping Services
• USPS Priority Mail
• USPS First Class Package
• USPS Ground Advantage
• USPS Priority Mail Express
• UPS Shipping Services
• UPS Ground
• UPS 2nd Day Air A.M. (commercial addresses only)
• UPS 2nd Day Air
• UPS 3 Day Select
• UPS Next Day Air Saver
• UPS Next Day Air
• UPS Next Day Air Early
• UPS Standard

International Shipping Services

• USPS International Shipping
• USPS First Class Package International
• USPS Priority Mail Express International
• USPS Priority Mail International
• UPS International Shipping
• UPS Worldwide Expedited
• UPS Worldwide Express Plus
• UPS Worldwide Express
• UPS Worldwide Saver

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging with exceptions. (See sale items and special order items).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale. 

Defective items (if applicable)
Defective items under manufacturer warranty will be eligible for return, as well as a full refund for the total amount paid by the customer. The following criteria must be met to be eligible. (a). The part is under manufacturer warranty (b). the manufacturer has determined the part defective for the purchased application. 

Refunds (if applicable)
Once your item is returned and received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7 business days. For order placed by phone through a card terminal, you must call in to initiate the refund. 

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded. 

Special Order Items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team. 

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@allprotruckparts.com and send your item to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.

Shipping
To return your product, you should mail your product to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, it is advised that you use a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
For returned items designated as "Free Shipping", any items shipped to the customer in which the customer did not pay shipping. All Pro Truck Parts will recover the cost of shipping to the customer's address from the refundable amount owed to the customer on the return and inspection of the item.