2020 Oregon Catalog

Linkage, Jacks, & Hardware

The Three-Point Hitch System

Top Link Pin

Top Link

Clevis

Lift Arm

Stabilizer Arms

Lynch Pins

Drawbars

Introduction A typical tractor three-point hitch system is standard on almost all farm tractors today. The basic function of the system is the attachment and adjustment of agricultural implements. The three primary parts of the system are the top link and two lower lift arms as shown in gold and brown in the illustration above. Special pins are used to fasten the implement at these three points: top link pins and draw pins (lift arm pins). Adjustment of one or all of these components allows the tractor operator to raise, lower or tilt an imple- ment. The three-point linkage parts described in this catalog are built to standard specifications set by the American Society of Argicultural Engineers (ASAE) described in the table on the right. Category 1, 2, 3, and 4 Categories are used to classify tractors by drawbar horse- power. The table below gives the dimensions and the horsepower ratings that are associated with these three categories.

Top Link Connection

Lift Arm Connection Most lift arm pins are threaded on the end that bolts to the implement bracket. The unthreaded end with the cross hole accommodates the ball socket of the lift arm. The lift arm is secured on the pin with a lynch pin or large “R” clip pin. See below. Lift arms and lift arm pins vary in length, but their respective ball socket holes and pin diameters are standard- ized by horsepower category.

L

Maximum Drawbar Horsepower

Top Link Pin Dia.

Pull/Draw Pin Dia.

Lift Arm Spacing

Cat. 0 - up to 20

5/8"

5/8" 7/8"

20" 26" 32" 38" 46"

Cat. 1- up to 45 3/4" Cat. 2- 40 to 100 1" Cat. 3- 80 to 225 1–1/4" Cat. 4- 135 to 300 1–3/4"

1–1/8" 1–7/16"

2"

Top Link Connection Top link pins are always unthreaded and are held in place by either a lynch pin, or in some cases, a large “R” clip pin. See below. Top links and top link pins vary in length, but their respective ball socket holes and pin diameters are standard- ized by horsepower category.

Linkage, Jacks, & Hardware

LG 802

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