Jonsered LT2120A2, Operator'S Manual

16

MAINTENANCE

BLADE REMOVAL (See Fig. 10)

•     Raise mower to highest position to allow access to 

blades.

•      Remove blade bolt, lock washer and fl at washer se cur ing 

blade.

•      Install new or resharpened blade with trailing edge up 

towards deck as shown.

IMPORTANT: TO ENSURE PROPER ASSEMBLY, CENTER 
HOLE IN BLADE MUST ALIGN WITH STAR ON MANDREL 
ASSEMBLY.

•     Reassemble blade bolt, lock washer and fl at washer 

in exact order as shown.

•      Tight en blade bolt se cure ly (27-35 Ft. Lbs. torque).

IMPORTANT:   BLADE BOLT IS HEAT TREATED. IF BOLT NEEDS 
REPLACING, REPLACE ONLY WITH APPROVE BOLT SHOWN 
IN THE REPAIR PARTS.

TRAILING EDGE UP

FLAT 
WASHER

LOCK 
WASHER

BLADE

MANDREL
ASSEMBLY

BLADE BOLT 

FIG. 10

TO SHARPEN BLADE (See Fig. 11)

NOTE:  We do not recommend sharpening blade - but if 
you do, be sure the blade is balanced.

Care should be taken to keep the blade balanced.  An un-
balanced blade will cause excessive vibration and even tual 
damage to mower and engine.
•      The blade can be sharpened with a fi le or on a grind-

ing wheel.  Do not attempt to sharpen while on the 
mower.

•      To check blade balance, you will need a 5/8" diameter 

steel bolt, pin, or a cone balancer.  (When using a 
cone balancer, follow the instructions supplied with 
bal anc er).

NOTE:  Do not use a nail for balancing blade.  The lobes of 
the center hole may appear to be centered, but are not.

CEN TER 
HOLE

STAR

TRACTOR

Always observe safety rules when per form ing any main-
 te nance.

BRAKE OPERATION

If tractor requires more than fi ve (5) feet to stop at highest 
speed in high est gear on a level, dry concrete or paved 
surface, then brake must be checked and ad just ed. (See 
“TO ADJUST BRAKE” in the Ser 

vice and Ad just ments 

section of this manual).

TIRES
•         Maintain proper air pressure in all tires (See “PROD UCT 

SPEC I FI CA TIONS” section of this man ual).

•      Keep tires free of gasoline, oil, or insect control chemi-

 cals which can harm rubber.

•     Avoid stumps, stones, deep ruts, sharp objects and 

other hazards that may cause tire damage.

NOTE: To seal tire punctures and pre vent fl at tires due to 
slow leaks, tire sealant may be purchased from your local 
parts dealer. Tire sealant also pre vents tire dry rot and 
corrosion.

OPERATOR PRESENCE SYS TEM AND REVERSE OP-
ERATION SYSTEM (ROS)

Be sure operator presence and reverse operation sys tems 
are work ing properly.  If your tractor does not function as 
described, repair the problem immediately.
•      The engine should not start unless the brake pedal is 

fully de pressed, and the attachment clutch con trol is 
in the dis en gaged position.

CHECK OPERATOR PRESENCE SYSTEM
•         When the engine is running, any attempt by the op er a tor 

to leave the seat without fi rst setting the parking brake 
should shut off the engine.

•      When the engine is running and the at tach ment clutch 

is engaged, any attempt by the operator to leave the 
seat should shut off the engine.

•     The attachment clutch should never operate unless 

the operator is in the seat.

CHECK REVERSE OPERATION (ROS) SYSTEM
•      When the engine is running with the ignition switch in 

the engine "ON" position and the at tach ment clutch 
engaged, any attempt by the operator to shift into 
reverse should shut off the engine.

•      When the engine is running with the ignition switch in 

the ROS "ON" position and the at tach ment clutch en-
gaged, any attempt by the operator to shift into reverse 
should NOT shut off the engine.

BLADE CARE

For best results mower blades must be kept sharp.  Re place 
bent or damaged blades.

CAUTION:  Use only a replacement 
blade approved by the manufacturer 
of your tractor. Using a blade not ap-
proved by the manufacturer of your 
tractor is hazardous, could damage 
your tractor and void your warranty.

828

ROS "ON" POSITION

ENGINE "ON" POSITION
(NORMAL OPERATING)