Engine-first fitment
John Deere Block Heaters
John Deere block heater locations, wattages and Zerostart parts for PowerTech, New Generation and common compact tractor engines.
Before ordering
Find the engine model or tractor serial plate first. Deere models can span several engine families, and the heater location follows the engine casting.
Part numbers and locations
John Deere PowerTech 4045 (4.5L) & 6068 (6.8L)
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 3500020 | 1000 W / 120 V | 1-5/8" thd | Immersion | 3600008 |
Replaces the 1-5/8" threaded plug on the right side of the engine.
John Deere PowerTech Plus iT4 4045 & 6068 (interim Tier 4)
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 3500069 | 1000 W / 120 V | 27 mm | Immersion | 3600008 |
Installs in the right rear of the engine.
John Deere — all tractors 1977+ with the large hex plug
Also covers Series 300/400 engines: 4039, 4239, 6059, 6414, 6466, 6076, 6081 and others.
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 3500029 | 1000 W / 120 V | 1-5/8" thd | Immersion | 3600008 |
Installs in the large hex plug on the left side of the engine. Point element up.
John Deere Series 300 (3/4-cylinder: 3164, 4039, 4045, 4219, 4239, 4276…)
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 8603596 | 1000 W / 120 V | 3/4" NPT | Immersion | 3600024 |
Replaces the 3/4" pipe plug on the rear face of the engine. 1987+ engines may need a 1" × 3/4" reducer bushing.
John Deere 6105, 6125
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 3500013 | 1500 W / 120 V | 1" NPT | Immersion | 3600008 |
Installs in the oil cooler housing.
John Deere 4024/5030 (2.4L & 3.0L, Series 250 PowerTech)
| Part | Power | Port | Type | Cord |
|---|---|---|---|---|
| 3500089 | 600 W / 120 V | 1.25" | Freeze plug | — |
Replaces the 1.25" core hole on the left side of the engine, near the starter.
Search John Deere heater part numbers
Check the application table for your exact engine. Cords, heater elements and surface pads are separate products.
Part reference
Zerostart 3500020
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Part reference
Zerostart 3600008
Industrial replacement cord, 15 A, 16/3 HPN, silicone connector K in PTI catalog. Cord only; not a heating element.
Cord / harness only — no heating element.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Amazon buying options
Zerostart 3500069
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
Choose your Amazon store
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Amazon buying options
Zerostart 3500029
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
Choose your Amazon store
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Part reference
Zerostart 8603596
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Part reference
Zerostart 3600024
Legacy fitment associations are not independently verified vehicle-specific purchase recommendations.
Cord / harness only — no heating element.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Part reference
Zerostart 3500013
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Part reference
Zerostart 3500089
Catalog starting point: confirm exact engine code, year and installation with the manufacturer.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
Affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Location check
Clean the casting and identify the exact plug described in the table. Do not remove a similar-looking oil, gallery or drain plug.
No exact match?
Use the magnetic guide for a temporary steel-pan option, or ask the dealer to search by engine serial number.
See every agricultural engine in the complete tractor block heater guide.