Contents
If you spend time around combines, corn heads, old gearboxes, bush hogs, or compact tractor repairs, you have probably heard someone say, “Just use corn head grease.” But what exactly is it? Is it regular grease? Is it gear oil? Or is it something in between?
The simple answer is this: corn head grease is a soft, semi-fluid grease designed for slow-moving gear cases, especially corn head row-unit gearboxes. It is thicker than gear oil, but softer than standard chassis grease. That makes it useful in places where regular oil may leak out, but heavy grease may not flow well enough to protect gears.
John Deere’s official product listing for AN102562 corn head grease describes it as an NLGI grade 0 grease that meets John Deere standards JDMJ13A5, J13E6, and J25A. It also notes the product’s green color for easy identification. shop.deere.com
What Is Corn Head Grease Used For?
The main use of corn head grease is in corn head gear cases. These are gearboxes that need lubrication, but often work in dusty, dirty, high-load conditions. A normal oil-filled gearbox may leak if the seals are worn. A stiff No. 2 grease may stay in one place and fail to flow back into the gears. That is where corn head grease becomes useful.
Because it is semi-fluid, it can move around inside the gearbox better than heavy grease. At the same time, it has more staying power than gear oil. D-A Lubricant’s product sheet describes corn head grease as suitable for corn head cases, slow-moving gearboxes, and bearing lubrication, while also advising users to follow OEM recommendations. D-A Lubricant Company
Corn Head Grease Specs
Most buyers searching for corn head grease specs want to know one thing: what grade is it?
In many cases, corn head grease is an NLGI 0 grease. That means it is softer than common No. 2 grease. It can flow slowly inside a case, especially when the gears start moving and warming it up.
Common features include:
-
NLGI 0 consistency
-
Semi-fluid texture
-
Extreme-pressure protection
-
Water washout resistance
-
Good flow inside slow-speed gearboxes
-
Better sealing behavior than gear oil in worn gearboxes
John Deere’s corn head grease is listed as meeting NLGI grade 0 and John Deere standards, while some other manufacturers also sell similar semi-fluid corn head lubricants. shop.deere.com+1
Corn Head Grease Weight: Is It Like Gear Oil?
People often ask about corn head grease weight, but grease is not usually measured like 80W-90 gear oil. Instead, grease is classified by NLGI grade. Lower numbers mean softer grease. Higher numbers mean thicker grease.
For example:
| Lubricant Type | General Feel |
|---|---|
| Gear oil | Fluid oil |
| NLGI 00 grease | Very soft semi-fluid grease |
| NLGI 0 corn head grease | Soft grease |
| NLGI 2 grease | Common chassis grease |
So, if someone asks, “What weight is corn head grease?” the better answer is: it is usually discussed as an NLGI 0 semi-fluid grease, not as a gear oil weight.
Is Corn Head Grease Only for Corn Headers?
No, but that does not mean you should put it everywhere. Corn header grease can be useful in some slow-speed gearboxes, leaking gear cases, or certain older equipment applications. You may see people using corn head gear grease in mower gearboxes, tiller gearboxes, steering boxes, or old tractor gear cases.
But here is the important part: you should always check the equipment manual first. If the manufacturer calls for gear oil, use gear oil unless there is a known reason and acceptable alternative. If it calls for NLGI 0 grease, then corn head grease may be a good match.
When Corn Head Grease Makes Sense
Corn head grease may be useful when:
-
A slow-speed gearbox calls for NLGI 0 grease
-
A corn head row unit requires it
-
Gear oil leaks from worn seals
-
You need a lubricant that flows better than No. 2 grease
-
The gearbox is not high-speed or high-temperature beyond product limits
It is not a magic fix for every leaking gearbox. If a seal is badly damaged, the right repair is still seal replacement. But for many farm equipment owners, corn head grease is a practical maintenance solution.
Corn head grease sits in a useful middle ground between oil and standard grease. It is soft enough to move inside a gearbox, but thick enough to stay where thinner oil may leak out. That is why it has become popular not only for corn heads, but also for certain slow-speed gearboxes and older farm equipment.
If you are not sure whether to use it, check the manual first. When the equipment calls for NLGI 0 grease or a corn head-style lubricant, corn head grease can be exactly what you need.