This three point linkage trailer hitch adapter is useful for easily lifting equipment around your farm.
WARNING: DO NOT attempt to build this project if you are not a skilled welder as failure of welds can result in injury to people or damage to property.
The steel shown in the cutting list is only a guide as you may have other material already available that you can use.
| Materials Required | |||
|---|---|---|---|
| Item Number | Material | Length | Quantity |
| 1 | 75x75x4mm SHS | 500mm | 1 |
| 2 | 75x75x4mm SHS | 2200mm | 1 |
| 3 | 75x75x4mm SHS | 700mm | 1 |
| 4 | 75x75x4mm SHS | 930mm | 1 |
| 5 | 50x10mm flat | 450mm | 2 |
| 6 | 75x10mm flat | 75mm | 1 |
| 7 | 75x10mm flat | 1900mm | 1 |
| 8 | 75x12mm flat | 1200mm | 1 |
| 9 | 25nb medium wall pipe | 1000mm | 2 |
| 10 | 75x10mm flat | 140mm | 2 |
| 11 | 75x10mm flat | 140mm | 2 |
| Lower 3 point linkage pins | To suit your tractor | 2 | |
| Upper 3 point linkage pin | To suit your tractor | 1 | |
Diagram 1
1. Begin by cutting the steel to the required sizes. Note that Item 2 has a 15 degree mitre cut on one end. Refer to Diagram 1. Also note that Item 4 has a 45 degree mitre cut on one end and a 60 degree mitre cut on the other end. Refer to Diagram 2.
2. Position Items 1 and 2 as shown in Diagram 1 and tack weld together. Ensure that the angle inside the 2 pieces of steel is 105 degrees.
Diagram 2
Diagram 3
3. Position the previously welded items into the centre of Item 3 as shown in Diagram 3 and tack weld.
4. Position Item 4 in place and tack weld. Refer to Diagram 3.
5. Fully weld all previously tack welded pieces of shs.
Diagram 4
6. Drill holes in Item 8 as shown in Diagram 4. The hole size will depend on what size “D” shackle you intend to use. Hole spacings are a suggestion only.
7. Drill holes in Items 10 to suit your tractors lower pins and Items 11 to suit the top pin of your three point linkage.
Diagram 5
8. Weld Items 8, 10 and 11 in place. Refer to Diagram 5.
9. Position Item 6 half way along Item 2 and weld in place. Refer to Diagram 5.
10. Mark the centre of Item 7 and position the centre mark over Item 6. Tack weld one end of Item 7 to Item 2, bend it over Item 6 and tack weld the other end. Fully weld. Refer to Diagram 5.
Diagram 6
11. Next to be fitted are Items 9. These can either be cut to the required angles and welded in place as shown in Diagram 6 or a simpler solution is to flatten the ends at the correct angles and then weld in place.
12. Grind any welds as required and paint.
I came across the three point linkage boom plans but I didn't have the confidence to build it myself so I got a friend who is a welder to make it for me. He says that the plans are very professionally done.
I have built several of the plans on this website and this one is my favourite.