Cub Cadet ST228 use, Fig, Fig, Fig, Fig, Nut, Fig, Fig, Fig, Fig, Fig, Fig, Fig, Hole, Knob, Shaft, Shaft, Shaft, Guard, Guard, NOTE:, Clamp, Blade, Shaft, Shaft, Edging

KNOW YOUR UNIT

APPLICATIONS			Spark Plug
As a trimmer:
•	Cutting grass and light weeds.	Muffler	Starter Rope Grip
•	Edging		Fuel Cap
• Decorative trimming around trees,
	fences, etc.
		Throttle Lock-Out
TOOLS REQUIRED:
• Flat head or T-20 screwdriver
•	3/8” socket	On/Off Control	Air Filter Cover
			Shaft Grip
	D-Handle		Throttle Control
			Choke Control
	Rapid-Link™		Lever
			Primer Bulb

Shaft Housing

ASSEMBLY INSTRUCTIONSREMOVING THE CUTTING HEAD ATTACHMENT

WARNING: Before using the brush cutter attachment make sure that only the metal blade guard is attached to the trimmer head. Always make sure to remove the plastic cutting guard shield when using the brush cutter attachment. Failure to do so may cause serious personal injury or damage to the unit.

If you want to trim or remove thicker, tougher and thornier brush you must use the metal brush cutter attachment. This is supplied with its own blade guard which must be securely attached to the trimmer head. In order to do this, both the cutting head attachment and cutting head shield must first be removed from the trimmer unit. To safely attach the brush cutter to the unit follow these instructions:

1.	Remove the cutting head shield from the shaft		Cutting Head
	housing (Fig. 1).		Attachment
2.	Position the cutting head attachment as shown
	(Fig. 7). Align the shaft bushing hole with the
	locking rod slot. Insert the locking rod into the
	shaft bushing hole.
3.	Hold the locking rod in place by grasping it next		Shaft
	to the boom of the shaft housing (Fig 7).
			Housing
4.	While holding the locking rod, remove the cutting BushingShaft
	head attachment by unscrewing it clockwise (Fig. Hole
	8). Store the cutting head attachment for future
	use.
INSTALLING THE BRUSH BLADE GUARD		Locking
		Rod Slot
1.	Place the brush blade guard onto the trimmer head		Locking Rod

with the three holes aligned.

Cutting Head Shield

Line Cutting Blade

Cutting Head

ASSEMBLY INSTRUCTIONS

INSTALL THE CUTTING HEAD SHIELD

WARNING: To prevent serious personal injury, never operate the trimmer without the cutting attachment shield in place.

2.Attach the blade guard to the trimmer head with the three guard bolts and nuts using a 7/16 inch closed-end or socket wrench (Fig. 9).

UnscrewClockwise

Cutting Head

Attachment

Shaft	Shaft
	Housing
Bushing
Hole
Locking

Fig. 7

GuardBolts (3)Brush Blade

Guard

Trimmer HeadNuts (3)

1. Place the cutting head shield onto the guard mount

bracket, making sure to align the holes on the shield with

Cutting

Screw (4)

Rod Slot

Locking Rod

	the ones in the guard mount bracket. (Fig. 1)
2.	Take the 4 shield screws and screw each one into the
	shield until finger tight.
3.	Using a Flat Head or T-20 screw driver, tighten the screws
	until the shield is firmly in place.

INSTALL AND ADJUST THE D-HANDLE

Head Shield

Guard Mount

Bracket

Fig. 8 Fig. 9

INSTALLING THE BRUSH CUTTER BLADE

WARNING: If the cutting blade is off-center, the unit will vibrate and the blade may fly off, causing possible serious personal injury.

1.Remove the screws and bottom clamp.

2.Place the D-handle over the shaft housing and onto the bottom clamp (Fig. 1). Move it a minimum of 6 inches (15.24 cm) from the end of the shaft grip.

3.Start the screws with an appropriate tool. Do not tighten until making the handle adjustment.

4.If pre-installed, loosen the screws just enough to move it.

5.While holding the unit in the operating position (Fig. 23), move the D-handle to the location that provides the best grip.

6.Tighten the clamp screws evenly until handle is secure.

NOTE: Make sure the barrier bar is on the operating side when the unit is held in the operating position.

	Fig. 1
Screw (4)	Barrier Bar

D-HandleMinimum 6 in. (15.24 cm)BottomClamp

Fig. 2

1.Place the cutting blade on the output shaft bushing (Fig. 10).

2.Make sure that the cutting blade is centered on the pilot step and sitting flat against the output shaft bushing (Fig. 12).

3.Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole (Fig. 11).

4.Put the blade retainer and nut on the output shaft. Make sure that the blade is installed correctly.

5.Tighten nut counterclockwise against the blade while holding the locking rod:

•	If using a torque wrench and an 1/2 inch socket tighten
	to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.
•	Without a torque wrench, use a 1/2 inch closed-end or

Blade Retainer Nut

Cutting

BladePilot HoleOutput Shaft

Bushing

	Fig. 10
Shaft	Output Shaft

OPERATING THE RAPID-LINK™ SYSTEMThe Rapid-Link™ system enables the use of these optional Add-Ons.

Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AF720 Hedge Trimmer* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AH720* Brushcutter* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC720* Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720 Edger* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720*

socket wrench, turning the nut until the blade retainer is

snug against the shaft bushing. Make sure that the blade

is installed correctly, then rotate the nut an additional 1/4

to 1/2 turn counterclockwise (Fig. 13).

WARNING: To avoid serious personal injury or damage to the unit, do not start or operate this unit with the locking rod in the locking rod slot.

Bushing Hole
	Output
Locking	Shaft
	Bushing
Rod Slot

Pole Saw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS720

Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS725

Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720

* Do NOT use this Add-On with an electric powered unit.

			Rapid-Link™	Release
REMOVING THE ADD-ON			Coupler	Button
1.	Turn the knob counterclockwise to loosen (Fig. 5).
2.	Press and hold the release button (Fig. 3).
3.	While firmly holding the upper shaft housing, pull the lower shaft
	housing straight out of the Rapid-Link™ coupler (Fig. 4).		Guide Recess
INSTALLING THE ADD-ON
			Fig. 3
NOTE: To make installing or removing the
		Primary Hole	90˚ Edging Hole
	add-on easier, place the unit on the
	ground or on a work bench.		(Trimmer Only)
1.	Turn knob counterclockwise to loosen
	(Fig. 5).
2.	While firmly holding the add-on, push it
	straight into the Rapid-Link™ coupler	Upper Shaft	Lower Shaft
	(Fig. 4).
		Housing	Housing	Knob
NOTE: Aligning the release button with the
		Fig. 4	Fig. 5
	guide recess will help installation (Fig. 3).
3.	Turn the knob clockwise to tighten (Fig. 5).

For decorative trimming/edging with the line cutting head, lock the release button into the 90° hole (Fig. 5).

Locking Rod

6. Remove the locking rod from the locking rod slot.

Fig. 11

Pilot Step1/4-1/2 turnCounterclockwise

Fig. 12 Fig. 13

REMOVING THE BRUSH CUTTER BLADE

WARNING: Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to break off while in use. This can result in severe personal injury. Replace the blade.

WARNING: To avoid serious personal injury, always wear gloves while handling or installing the blade.

Clockwise

1. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the bushing hole (Fig. 11).

2. Hold the locking rod in place by grasping it next to the shaft housing (Fig. 14).

3. While holding the locking rod, loosen the nut on the blade by turning it clockwise with a 1/2 inch closed-end or socket wrench (Fig. 14).

4.Remove the nut, blade retainer and blade. Store the nut and blade together for future use in a secure place.

Store out of children’s reach. Fig. 14

REMOVING THE BRUSH BLADE GUARD

1.Loosen and remove the three guard bolts and nuts using a 7/16 inch closed-end or socket wrench (Fig. 9). Store with brush cutter blade for future use.

3