3 Point Linkage Parts & Tractor Hitch Components Manufacturer Ravina Industries

Many of the products described in this catalog are components of the typical tractor three-point hitch system that is standard on almost all farm tractors today. See illustration A below. 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 yellow and red in illustration A. 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 implement. 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.

Tractor Three-Point Hitch System – Components, Function & Standards

The tractor three-point hitch system is a standard feature on almost all modern agricultural tractors, designed for efficient attachment and control of farming implements. This system plays a critical role in improving productivity, stability, and precision in agricultural operations.

Key Components of a Three-Point Linkage System

The three-point hitch consists of three primary components:

• Top Link – Provides vertical adjustment and controls the angle of the implement

• Lower Lift Arms – Two arms that support and lift the implement

• Hitch Pins (Top Link Pins & Draw Pins) – Secure the implement at three connection points

These components work together to ensure a strong and stable connection between the tractor and attached equipment.

Function & Adjustment Benefits

The main function of the three-point linkage system is to attach, lift, lower, and tilt agricultural implements. By adjusting the top link or lift arms, tractor operators can:

• Control implement depth and angle

• Improve field performance and efficiency

• Ensure proper ground contact and leveling

• Enhance safety and operational precision

3 Point Linkage Parts & Tractor Hitch Components Manufacturer Ravina Industries

Linkage and Hitch Components

• Top Link Pin: The pin that secures the top link to the tractor.

• Top Link: The upper arm of a three-point hitch used to control the pitch of an implement.

• Upper Stay Strap: A supporting strap located at the upper section of the linkage.

• Lift Arm Leveling Assembly: The mechanism used to adjust the height and level of the lift arms.

• Stabilizer Bracket: A mounting point for stabilizers to prevent lateral movement of the hitch.

• Check Chain Eye Bolt: The bolt used to attach the check chains.

• Lift Arm: The primary lower arms that provide the lifting force for implements.

• Adjustable Stabilizer Arm: An arm that can be adjusted to limit the side-to-side sway of an implement.

• Lynch Pin: A locking pin used to prevent wheels or other parts from sliding off the axle upon which they are riding.

• Swinging Drawbar Hanger: The support structure for the swinging drawbar.

• Swinging Drawbar: A drawbar that can pivot horizontally for easier implement attachment or specific towing needs.

• Drawbar: The heavy metal bar used for towing implements.

• Lower Stay Strap: A supporting strap located at the lower section of the linkage.

• Stabilizer Chain: Chains used to stabilize the lower lift arms.

Fitting of Top Link with Top Link Pin & Lynch Pin – Implement Connection Guide

The proper fitting of the top link using a Top Link Pin and Lynch Pin is essential for a secure and stable connection between the tractor and the implement in a three-point linkage system. This connection ensures correct implement positioning, efficient load transfer, and safe field operation.

Installation Process:

Begin by aligning the top link end with the mounting bracket on the tractor or implement. Insert the Top Link Pin through the aligned holes to create the primary connection. Once the pin is fully inserted, secure it by placing a Lynch Pin through the hole at the end of the top link pin. This prevents the pin from slipping out during operation.

Ensure that the connection is tight and properly seated. The top link should move smoothly without excessive play, allowing controlled adjustment of the implement angle.

Key Benefits:

• Provides a strong and reliable connection between tractor and implement

• Prevents accidental disconnection with secure lynch pin locking

• Maintains proper alignment and implement stability

• Allows easy attachment and detachment for operational efficiency

Applications:
Used across a wide range of agricultural implements such as ploughs, cultivators, rotavators, and trailers, this connection system is fundamental for safe and effective tractor operation.

A correctly fitted top link with a secured pin and lynch pin not only improves performance but also enhances operator safety and equipment longevity.

Lift Arm to Implement Connection – Draw Pin & Lynch Pin Fitting

The connection between the tractor lift arm and the implement is a key part of the three-point linkage system, ensuring proper lifting, stability, and control during operation. This connection is achieved using a Draw Pin (Lift Arm Pin) secured with a Lynch Pin.

Fitting Process:

Start by aligning the hole of the implement’s lower hitch point with the end of the tractor’s lift arm. Once aligned, insert the Draw Pin / Lift Arm Pin through both the lift arm and implement bracket to establish the main connection.

After inserting the pin fully, secure it by placing a Lynch Pin through the hole at the end of the draw pin. This locking mechanism prevents the pin from slipping out during field operations, especially under vibration and load.

Ensure the connection is firm while still allowing slight movement for flexibility during operation. Proper fitting helps maintain balance and ensures smooth lifting and lowering of the implement.

Key Features:

• Strong and reliable connection for heavy-duty implements

• Easy installation and removal for quick attachment changes

• Secure locking with lynch pin for safety

• Designed to handle load, shock, and continuous use

Applications:
Widely used for connecting implements such as ploughs, harrows, cultivators, and other farm equipment to tractor lift arms.

A properly secured lift arm connection with a draw pin and lynch pin ensures safe operation, improved performance, and reduced risk of accidental disconnection in the field.

• Check Chain Clevis: The U-shaped fastener used to connect check chains.

• Power-Take-Off (PTO): The splined drive shaft used to provide power to attached implements.