3-Point Hitch system3-Point Hitch system

• The three-point hitch is a device used on farming tractors. Three point attachment is the simplest and the only statically determinate way of joining two bodies in engineering.

3-Point Hitch Components3-Point Hitch Components

A—Center Link B—Lift Arms C—Lift Links D—Sway (Check) Chains E—Draft (lower) links

Preparing ImplementPreparing Implement• Category II implements should

have the top hole of the implement mast located 610 mm (24 in.) above the lower pins. Drill another hole in top mast or extend top mast if necessary.

Category Mast

Height

Width

Between

Lower Pins

Pin Size

Lower Upper

II 610 mm(24 in.)

824 mm(32-7/16 in.)

28.7 mm

(1-1/8 in.)

25.5 mm(1 in.)

HITCHESHITCHES3-point hitch is desired

Always hitch to the drawbar

Rockshaft Control LeversRockshaft Control Levers

• The rockshaft position is controlled by two levers, the rockshaft position control lever (A) and the rockshaft draft control lever (B)

• The rockshaft position control lever (A) raises the hitch when pulled rearward, and lowers the hitch when moved forward. See Using Rockshaft Position Control in this section for more information.

• The rockshaft draft control lever (B) controls hitch position relative to draft loads. See Using Draft Control in this section for more information.

A—Rockshaft Position Control LeverB—Rockshaft Draft Control Lever

Setting Position Control Lever Setting Position Control Lever StopStop

• NOTE: Position control lever stop is used when operating depth or height needs to be repeated.

1. Operate implement for a few minutes to determine proper depth or height.

2. Loosen lever stop (A), and slide against position control lever. Lock stop in position by turning in a clockwise direction. Rockshaft will now lower to same position each time control lever is pushed for

A—Lever Stop

Attaching Implements to 3-Point Hitch

1. Be sure drawbar will not interfere. If necessary, move drawbar ahead, or remove it. Check for any other potential interference.

• CAUTION: Prevent unexpected movement of rockshaft by placing draft sensing lever in the forward or OFF position before attaching implement to hitch.

2. Back tractor up to implement (A) so hitch points align. Place transmission in neutral (N), stop the engine and engage brakes BEFORE leaving the tractor seat.

Attaching Implements to 3-Point Hitch

3. Slip draft (lower) links over implement hitch pins (B), and retain with quick-lock pins.

• NOTE: Locking pins can be stored on draft (lower) links (through holes in sway chain ears) when not in use.

4. To remove center-link from transport hook, lift center link locking clip (C), and rotate tab (D) to rear of center link clip.

5. Attach center link to implement top mast.

6. Adjust center link and lift links as necessary. (See Leveling the Hitch in this section.

Attaching Implements to 3-Point Hitch

7. Using Rockshaft Position Control Lever (E), lower and raise implement slowly and check for any point of interference.

E—Rockshaft Position Control LeverF—Rockshaft Draft Control Lever

Adjusting Hitch Side Sway (chain)

Implement side sway (check chain) should be adjusted when the rockshaft is raised for transport by loosening the jam nut on the threaded link (A) and turning the center rod to increase or decrease the length of chain. Tighten jam nut again when adjusted.

A—Threaded Link

Leveling the Hitch

• 1. Lower implement to take weight off hitch.

• 2. Adjust center link to level implement front-to-rear.

• Unlatch locking clip (A). Rotate center link body (B)

• clockwise to lengthen center link or counterclockwise to shorten it. Be sure to latch the locking clip. A—Locking Clip

B—Center Link Body

Leveling the Hitch• 3. Adjust right-hand link to

level implement side-to-side. Lift locking handle (C) and turn 1/4 turn to engage slot (D) onto roll-pin in the center portion of the lift link.

• Turn crank handle (C) clockwise to raise draft link.

• Turn crank handle (C) counterclockwise to lower draft link.

C—Locking HandleD—Slot

Three-point hitch specificationsThree-point hitch specifications

Category upper linkHitch pin size

lower links Hitch pin size

Lower hitch spacing

Tractor drawbar power

0  17 mm (5⁄8") 17 mm (5⁄8") 500 mm (20") <15 kW (<20 hp)

 1  19 mm (3⁄4") 22.4 mm (7⁄8")

718 mm (26") 15-35 kW (20-45 hp)

 2  25.5 mm (1") 28.7 mm (1 1⁄8")

870 mm (32") 30-75 kW (40-100 hp)

 3   31.75 mm (1 1⁄4") 37.4 mm (1 7⁄16")

1010 mm (38")

60-168 kW (80-225 hp)

 4  45mm (1 3⁄4") 51 mm (2") 1220 mm (46")

135-300 kW (180-400 hp)