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John Deere 820 Injection Pump 1990-2000: OEM AR50901

JOHN DEERE 820 INJECTION PUMP 1990-2000: OEM AR50901

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,595.00

CORE CHARGE:

$750.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBERAR50901
PART TYPEInjection Pump
BRANDTamerx Diesel Products
ENGINE MAKEJohn Deere
ENGINE TYPE820
YEAR1990-2000
PART NUMBERAR50901RM

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Injection Pump, Tamerx part number AR50901RM ( OEM Part Number AR50901 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a John Deere 820, production years 1990-2000, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM AR50901
Additional OEM AR50901, DB-2443, DB2443

ADDITIONAL DETAILS

CONDITION Remanufactured
UPC / Barcode 00840490547551
WEIGHT 18.00 LBS

SHIPPING OPTIONS

Ship Weight : 18.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Restore dependable fuel delivery with the John Deere 820 Injection Pump 1990–2000: OEM AR50901, crafted to help your engine achieve consistent performance across a range of operating conditions. This injection pump ensures accurate fuel metering and smooth combustion in compatible John Deere 820 applications. Built to meet OEM standards, it delivers a precise fit and long-lasting reliability you can count on. A trusted choice for keeping your engine running efficiently and dependably.

FITMENT CHART

YEARMAKEENGINE(S)
1990John Deere 820
1991John Deere 820
1992John Deere 820
1993John Deere 820
1994John Deere 820
1995John Deere 820
1996John Deere 820
1997John Deere 820
1998John Deere 820
1999John Deere 820
2000John Deere 820

PEOPLE ALSO ASKS | BLOG(S)

The injection pump is a cornerstone of any diesel engine’s fuel system, responsible for delivering the right amount of fuel to the engine’s injectors at the correct pressure and timing. The John Deere 820 Injection Pump (1990–2000, OEM AR50901) is engineered to meet original specifications for reliable fuel delivery, ensuring smooth combustion and dependable engine performance. For owners and technicians working with John Deere 820 engines, choosing an OEM-grade pump helps maintain fuel system efficiency and long-term engine health.

This injection pump plays a critical role in how your engine runs — here’s why it matters:

  • Accurate Fuel Delivery – Delivers metered fuel to injectors at the precise pressure needed for efficient combustion, supporting responsive engine performance.

  • Supports Consistent Engine Operation – Proper fuel delivery helps reduce rough idling, hard starts, or uneven power output, contributing to smoother overall operation.

  • Enhances Fuel Efficiency – By ensuring the engine receives the right fuel amount at the right time, this pump helps optimize combustion and reduce wasted fuel.

  • OEM-Grade Fit and Durability – As OEM AR50901, the pump is built to match original specifications for fitment and long-lasting reliability in demanding diesel applications.

  • Prevents Fuel System Issues – Replacing a worn or failing injection pump helps avoid symptoms like poor throttle response, increased exhaust smoke, or premature engine wear.

A properly functioning injection pump is vital to maintaining dependable engine performance and fuel system health. The John Deere 820 Injection Pump (OEM AR50901) delivers the precision and OEM-standard quality needed for stable fuel delivery, efficient combustion, and long-term engine reliability. For customers seeking a trusted replacement, Tamerx offers high-quality components designed to support smooth, efficient, and dependable diesel engine operation.

The injection pump is a critical component of the fuel system, responsible for delivering the correct amount of fuel to the injectors at the proper pressure and timing. Because it operates under high pressure and relies on clean fuel for lubrication, even small issues can lead to failure. Understanding the common causes of injection pump failure helps prevent costly repairs and engine downtime.

Common Causes of Injection Pump Failure

  • Contaminated Fuel
    Dirt, water, or debris in the fuel can wear internal pump components and cause corrosion.

  • Poor Fuel Quality or Low Lubricity
    Low-quality fuel or lack of proper lubrication can lead to excessive wear of internal pump parts.

  • Fuel Starvation
    Clogged fuel filters or restricted fuel lines can cause the pump to run dry, damaging internal components.

  • Water Intrusion
    Water in the fuel system promotes rust and internal corrosion, shortening pump life.

  • Overheating
    Inadequate fuel flow or excessive operating temperatures can cause seals and internal components to fail.

  • Improper Installation or Timing
    Incorrect pump timing or installation errors can place excessive stress on the pump.

  • Wear and High Mileage
    Over time, internal components naturally wear, especially in high-mileage or heavy-duty applications.

Injection pump failure is often caused by fuel contamination, poor lubrication, or restricted fuel flow. Regular fuel system maintenance—such as replacing filters, using clean fuel, and addressing leaks early—can significantly extend pump life. Proactive care helps ensure reliable fuel delivery, optimal engine performance, and reduced repair costs.

With proper maintenance and clean fuel, this injection pump can last many years of service. Longevity depends on operating conditions and routine fuel system care.

Regularly changing fuel filters and using clean, high-quality diesel fuel helps prevent debris from entering and damaging the pump. Keeping the fuel system free of contaminants prolongs pump life.

Yes, air in the fuel lines can cause the pump to lose prime or deliver inconsistent fuel, leading to rough running or starting difficulties. Bleeding the fuel system properly after service helps prevent these issues.

Contaminated fuel containing water, dirt, or debris can accelerate internal wear and clog injector passages. Using clean fuel and filters helps protect the pump’s internal components.

John Deere Injection Pumps

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