Fuel Injector RE36935 RE36936 for John Deere 400G 4039D 4039T Engines
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
| John Deere 400G crawler |
| John Deere 4039D engine |
| John Deere 4039T engine |
Product Overview
An injector with poor spray pattern or leakage can cause hard starting, misfire, smoke, engine knock and uneven cylinder contribution.
Injector condition directly affects combustion quality. Before replacement, it is good practice to confirm fuel quality, injection-pump condition and compression so a new injector is not used to mask another engine problem.
Key Features & Performance
- Meters and atomizes diesel fuel into the combustion chamber
- Correct injector condition supports clean starting, balanced combustion and normal power
- Intended for the listed engine/injector family; calibration and engine build must match
Technical Specifications
| Mechanical diesel injector | |
| 4039D / 4039T application |
Replaces / Cross-References
RE36935, RE36936
Common Reasons for Replacement
- Hard starting or rough idle
- Excessive smoke or diesel knock
- Poor cylinder balance or loss of power
- Injector leakage or poor spray pattern
Fitment Notes
Verify RE36935 or RE36936 and the injector specification for your exact 4039 engine build before ordering.
Frequently Asked Questions
How should I verify fitment?
Verify RE36935 or RE36936 and the injector specification for your exact 4039 engine build before ordering.
Is this an OEM part?
This listing is for a new replacement part. It is not represented as the original manufacturer's branded part unless the product listing specifically states otherwise.
What should I check before installation?
Compare the replacement with the removed part before installation, correct any related wiring, hose, mounting or system problems, and follow the equipment manufacturer's service procedures.