A 3-point hitch is an essential part of almost all tractors today. This tool connects an agricultural or industrial tractor with plows and other implements. When using it, your tractor will have more usable traction.
This article will give you a detailed overview of 3 point hitches for tractors and their uses in your daily farm work.
Table of Contents
- An Overview Of 3 Point Hitches For Tractors
- 3-point Hitch Parts Diagram
- How Does A Tractor 3-pt Hitch work?
- General Dimensions & Categories
- How To Connect A Tractor 3 Point Hitch?
- How To Adjust A Three-point Hitch?
- Frequently Asked Questions
- Final Words
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An Overview Of 3 Point Hitches For Tractors
A 3-point hitch (or 3-point linkage) is a simple connector between a tractor and an implement (or an attachment) in agricultural machinery. You can transfer that implements weight and resistance to the tractor’s drive wheels using this connector.
The invention of 3-point hitches opens a new era in agricultural life. It helps farmers yield, lower human labor costs, and boost the tractor’s functionality.
The first 3-point hitch was invented by Harry Ferguson in 1936. In 1938, Ferguson made a production agreement with Ford Corporation to apply the first 3-point hitch in the Ford model 9N tractors in 1939, which became a big success for Ford afterward.
After the success of the 3-point hitch on the Ford 9N-Series, other manufacturers started producing their 3-point hitches.
By 1960, the specifications of the 3-point hitch became standardized in the agricultural industry by the American Society of Agricultural Engineers (ASAE 217) and then the International Association for Standardizations (ISO 730-1).
3-point Hitch Parts Diagram
A 3-point hitch is made of the 4 following parts to attach a wheeled tractor to an implement:
- Tractor’s hydraulic system
- Lifting drums
- Attaching parts
The below diagram illustrates how these parts of a 3-point hitch are connected. These components appear in most Category 0, 1, 2, 3 hitches.
The tractor’s hitch size (or category) depends on the tractor’s drawback horsepower. A hitch in the higher category has more powerful lift arms and larger connector pins.
|Hitch category||Tractor power||Top link pin diameter||Lifting arm pin diameter||Lower hitch spacing|
|Category 0||Up to 20HP||5/6”||5/8”||20”|
|Category 2||40-100HP||1”||1 1/8”||34”|
|Category 3||80-225HP||1 ¼”||1 7/16”||40”|
|Category 4||>180HP||1 ¾”||2”||48”|
How Does A Tractor 3-pt Hitch work?
A 3 point hitch receiver is constantly attached to the rear of a tractor.
It consists of 2 lift arms and a top link with the operational concepts as below:
- 2 lift arms: The tractor’s hydraulic system controls the up and down movement of these lift arms and the attached implement movement.
- Top link: Keep the attached implement raise and lower in the same vertical plane. You can adjust the length of the top link as level or tilted, depending on your demands.
The connecting holes are placed at the end of the lift arms and the top links. You can connect the 3-point hitch with the implements by mating the holes with the implement pins. You can also quickly remove or attach different implements on the tractor, depending on your work requirements.
The connecting hole size depends on the category of the 3-point hitch. For example, a Category 3 hitch is used with a tractor of 80-225HP. This hitch has a top link pin diameter of 1¼ inches and a lift arm pin diameter of 1-7/16 inches
General Dimensions & Categories
In general, 3-point hitches are grouped into 5 size categories from Category 0 to Category 4. They differ in the attached tractor’s power, top link pin diameter, lift arm pin diameter, and lower hitch spacing.
Category 0 3-point hitches are light-duty, and they fit with agricultural implements of 20-inch wide. The distance from the lower pin to the top link pins of this hitch is 12 inches.
A Category 0 3-point hitch can work with popular tractor brands like John Deere, Bolens, Cub Cadet, Case, and so on. They can attach many implements like tillers, plows, back blades, cultivators, thatchers, etc.
Category 0 3-point hitches were popular in the 1970-1990s. Up till now, they are only seen on used garden tractors and lawn tractors or old sub-compact tractors (like Sotah Beaver). Due to the increasing demands of farmers, new sub-compact tractor models can work with a Category 1 hitch.
Category 1 3-point hitches fit with sub-compact and compact tractors with horsepower from 20HP to 45HP. This hitch has a top link pin diameter of ¾ inches and a lift arm diameter of 7/8 inches. Two lift arms are placed 26 inches apart.
Besides the category size, you should consider your tractor’s weight capability to pick up appropriate implements. For example, my 6-feet Category 1 rear blade weighs 300 pounds, which is too heavy for my small sub-compact Bolens tractor.
Limited Category 1
Limited Category 1 3-point hitches can be used with some small sub-compact tractors. This hitch type has the exact mounting dimensions like the Category 1 one. But it differs in the tractor’s type, the movement of the lift arms, and how much ground clearance they have.
Tractors that have horsepower from 40HP to 100HP can work with Category 2 3-point hitches. These hitches use 1-inch top link pins and 1 1/8-inch lift arm pins and have a lift arm spacing of 32 inches.
Due to its dimensions, Category 2 hitches can handle heavier-weight implements than Category 1 ones. For example, they can carry back blades, box scrapers, and rakes with heavier weights and sizes.
If you have already got a Category 1 hitch, you can change the pins or use bushings to get the diameter like a Category 2 one. And vice versa, you can switch a Category 2 hitch to a Category 1 one thanks to its interchangeable balls at the end of the lift arms.
You can use a Category 3 3-point hitch on tractors from 80HP to 225HP. This hitch has top link pins of 1 ¼ inch and lifts arm pins of 1 7/16 inches. It accepts all implements for medium-sized 3-point hitches, like row-crop cultivators or field cultivators.
Category 4 3-point hitches can work with tractors of 180HP or greater. This hitch has a top link pin diameter of 1 ¾ inch and a lift arm pin diameter of 2 inches. The spacing between two lift arm pins of this hitch type is approximately 46 inches.
Besides the above categories, there are also N (narrow) hitch variants. These variants have the same pin diameters but a lower width compared to their main categories.
- Category 3N
A Category 3N hitch has a lift arm spacing of only 32 inches. You should notice the difference between these 3-point hitches when shopping for implements. Some Category 3 hitches can quickly convert to a Category 3N hitch.
Besides, Category 3N hitches with the same width as Category 2 ones can also be used with the same implements, provided that you apply bushings to the pins.
- Category 4N
A Category 4N hitch has a slightly narrower lift arm spacing of 38 inches.
You may often see these above narrow variants in “quick hitches” (for example, John Deere iMatch quick hitch). These N variants allow heavy-duty tractors to attach to smaller implements easily.
How To Connect A Tractor 3 Point Hitch?
After purchasing a tractor, the first thing to do is learning how to build a 3-point hitch. However, you can get this job done easier by practicing it several times.
Step 1: Connect The Hitch With Your Tractor’s Rear
First, look at the back end of your tractor. You will notice an adjustable lift arm that can go up and down, and the remaining one is fixed.
Start attaching the fixed arm with the right side of your tractor. Then, adjust its height with a linchpin until it’s aligned with the tractor.
Step 2: Adjust The Attachment
After the fixed side has been finished, you can go on with the adjustable lift arm.
Try to adjust the lower link arm to be aligned with the hole on the implement. Then, adjust the top link to the right length to return to the implement’s hole and slip a pin to finish.
Finally, slip a pin through the top link and the implement to finish.
Now the hitch has been successfully connected with the tractor. You can start using the tractor to lift your implement.
Step 3: Adjust Stabilizers
You should adjust the stabilizers to avoid the tractor’s tire damage. The stabilizers are the turnbuckles that lie from the tractor’s axle to the lower 3-point lift arms. If you skip this step, your implement will flop back and forth. Some implements can even get into the tractor’s tires and break them.
So, remember to adjust the stabilizers to keep the implement tight and protect your tractor’s tires.
Step 4: Attach The Pto
Before attaching the PTO, you must turn off your tractor.
Pull the collar back and slide on the shaft of the PTO until it’s past the groove in the shaft. Then, pull it back and release the collar to finish attaching the PTO.
How To Adjust A Three-point Hitch?
If you have several implements and need to swap them, you must know how to adjust your 3-point hitch.
You can make adjustments to your hitch by modifying its two main parts – the top link and the stabilizers. Please watch the following video to know how to do it:
Frequently Asked Questions
1. Are All Tractor 3-point Hitches The Same?
No. There are 5 different 3-point hitches. They differ from each other in the triangle’s dimensions and the connecting pins’ size.
2. How Much Weight Can A 3-point Hitch Lift?
The approximately maximum lifting weight of a 3-point hitch depends on the hitch’s category. For example, a Category 0 hitch can lift up to 500 pounds, while a Category 4 hitch can lift to 20.000 pounds.
3. What Is The Smallest Tractor With A 3-point Hitch?
Category 0 tractor is the smallest tractor for a 3-point hitch—for example, John Deere 140 H3.
4. What Is The Difference Between The Cat 1 2 3-point Hitches?
The differences between the Category 1 and Category 2 3-point hitches lie in their tractor powers, top link pin diameter (20-45HP vs. 40-100HP), lift arm pin diameter (3/4 inches vs. 1 inch), and lower hitch spacing (7/8 inches vs. 1 1/8 inches).
The invention of the 3-point hitches for tractors has helped revolutionize the agricultural industry since the 1990s. After knowing what a 3-point hitch is and how it works, you can now use it to maximize your tractor’s performance and increase your crop production.