Kubota tractor (BX25DLB-AU, LA240A, LA240A, AU-SG, BT602). OPERATOR'S MANUAL - part 29

85

PERIODIC SERVICE OF THE TRACTOR

(For non-accessible maintenance-free type batteries.)
Maintenance-free, non-accessible batteries are designed
to eliminate the need to add water. Yet the volume of
electrolyte above plates may eventually become depleted
due to abnormal conditions such as high heat or improper
regulator setting. Use a voltmeter to check the state of
charge. (See reference chart below to determine if
charging is necessary.)

C

Battery Charging

To avoid personal injury:
A

When the battery is being activated, hydrogen
and oxygen gases in the battery are extremely
explosive. Keep open sparks and flames away
from the battery at all times, especially when
charging the battery.

A

When disconnecting the cable from the battery,
start with the negative terminal first. When
connecting the cable to the battery, start with
the positive terminal first.

A

Never check battery charge by placing a metal
object across the posts.
Use a voltmeter or hydrometer.

1. To slow charge the battery, connect the battery

positive terminal to the charger positive terminal and
the negative to the negative, then charge for at least 1
hour at 6.5 amperes.

2. A boost charge is only for emergencies. It will partially

charge the battery at a high rate and in a short time.
When using a boost-charged battery, it is necessary to
recharge the battery as early as possible.
Failure to do this will shorten the battery's service life.

3. When the specific gravity of electrolyte is between

1.27 and 1.29 the charging is completed.

C

Battery for storage

1. When storing the tractor for a long period, remove the

battery from tractor, adjust the electrolyte to the proper
level and store in a dry place out of direct sunlight. 

2. The battery self-discharges while it is stored.

Recharge it once every 3 months in hot seasons and
once every 6 months in cold seasons.

Battery voltage

Reference state of charge

12.6

                   100%(Full charge)

12.4

75%

12.2

50%

12.0

25%

11.8

  0%

(1) Battery

PERIODIC SERVICE OF THE TRACTOR

86

B

Cleaning Air Cleaner Element

To avoid personal injury:
A

Be sure to stop the engine and remove the key
before cleaning air cleaner element.

1. Remove the air cleaner cover and the element.

(1) Undo the hook
(2) Turn the cover clockwise and detach it.

2. Clean the element:

1) When dry dust adheres to the element, blow

compressed air from the inside, turning the
element. Pressure of compressed air must be
under 205kPa (2.1kgf/

).

2) When carbon or oil adheres to the element,

soak the element in detergent for 15 minutes
then wash it several times in water, rinse with
clean water and dry it naturally. After element
is fully dried, inspect inside of the element with
a light and check if it is damaged or not.
(referring to the instructions on the label
attached to the case.)

3. Replace air cleaner element:

Once yearly or after every sixth cleaning, whichever
comes first.

A

Check to see if the evacuator valve is blocked with
dust.

A

The air cleaner uses a dry element, never apply oil.

A

Do not run the engine with filter element removed.

A

Align the arrow marks when reinstalling the cover. If
the cover is improperly fitted, dust passes by the baffle
and directly adheres to the element.

C

Evacuator Valve

Open the evacuator valve once a week under ordinary
conditions - or daily when used in a dusty place - to get rid
of large particles of dust and dirt.

B

Checking Fuel Lines and Fuel Filter

To avoid personal injury:
A

Stop the engine and remove the key before
checking fuel lines and fuel filter.

A

Check the fuel lines periodically. The fuel lines
are subject to wear and aging. Fuel may leak
out onto the running engine, causing a fire.

The fuel line connections should be checked annually or
every 100 service hours, whichever occurs first.
1. The fuel line is made of rubber and ages regardless of

service period. 

2. After inspection, if the fuel line and clamps are found

damaged or deteriorated, replace them.

3. Check fuel filter, if it is clogged by debris or

contaminated by water, replace it.

A

When the fuel line is disconnected for maintenance or
repair, plug both ends of the fuel line with a clean plug
of suitable size to prevent dust and dirt from entering.
Particular care must be taken in order to avoid dust
and dirt getting into the fuel system. Entrance of dust
and dirt causes malfunction of the fuel pump. 

(1) Element
(2) Cover
(3) Evacuator valve

(1) Pipe  clamps
(2) Fuel line
(3) Fuel filter

87

PERIODIC SERVICE OF THE TRACTOR

A

If the fuel line is removed, be sure to properly bleed the
fuel system.
(See "Bleeding Fuel System" in "SERVICE AS
REQUIRED" in "PERIODIC SERVICE OF THE
TRACTOR" section.)

B

Adjusting Fan belt Tension

To avoid personal injury:
A

Be sure to stop the engine and remove the key
before checking belt tension.

1. Stop the engine and remove the key.
2. Apply moderate thumb pressure to belt between

pulleys.

3. If tension is incorrect, loosen the alternator mounting

bolts and, using a lever placed between the alternator
and the engine block, pull the alternator out until the
deflection of the belt falls within acceptable limits.

4. Replace fan belt if it is damaged.

B

Adjusting HST Neutral Spring (for Speed 

Control Pedal)

To avoid personal injury:
A

Do not operate if tractor moves on level ground
with foot off speed control pedal.

A

If tractor moves on level ground with foot off
the pedal, or, if the pedal is too slow in
returning to "NEUTRAL" position when
removing the foot from the pedal, consult your
local KUBOTA Dealer.

The HST neutral spring located under the front right side
of the fender can adjust returning speed of speed control
pedal. Consult your local KUBOTA Dealer for service.

(1) Fuel pump
(2) Fuel filter

Proper fan belt 
tension

A deflection of between 7 to 9 mm 
when the belt is pressed in the 
middle of the span.

(1) Bolt

(A) Check the belt tension

(1) HST neutral spring
(2) Adjusting nut

PERIODIC SERVICE OF THE TRACTOR

88

B

Adjusting Brake Pedal

To avoid personal injury:
A

Stop the engine, remove the key, lower the
implement to the ground, and chock the wheels
before checking brake pedal.

A

Even if the brake pedal free travel is within the
limitation, adjust the brake pedal following the
procedure below.

A

If you are not able to adjust, consult your local
KUBOTA Dealer.

1. Release the parking brake.
2. Loosen the lock nut and turn the turnbuckle to adjust

the rod length so that the brake pedal free travel is 10
mm.

3. Extend the turnbuckle one additional turn.
4. Retighten the lock nut.
5. Depress the brake pedal several times and make sure

the brake pedal free travel is from 25 to 35 mm.

Proper brake 
pedal free travel

25 to 35 mm on the pedal

(1) Lock nut
(2) Turnbuckle

(A) Free travel
(B) Right rear tire