Kubota tractor (BX25DLB-AU, LA240A, LA240A, AU-SG, BT602). OPERATOR'S MANUAL - part 21

HYDRAULIC UNIT

Hydraulic Control Unit Use Reference Chart

In order to handle the hydraulics properly, the operator must be familiar with the following. Though this information may not
be applicable to all types of implements and soil conditions, it is useful for general conditions.

Implement

Soil condition

(1) Hydraulic control lever

Gauge wheel

(1) Check chains

Remarks

Moldboard plow

Light soil
Medium soil

Heavy soil

Hydraulic control

YES/NO

Loose

Adjust the check
chains so that
the implement
can move 5 to 6
cm laterally.
Check chains
should be tight
enough to
prevent
excessive
implement
movement when
implement is in
raised position.

Disc plow

---

Harrower (spike,
springtooth, disc
type)

---

Sub-soiler......

Weeder, ridger.....

---

YES

Tighten

Earthmove, digger
scraper, manure
fork rear carrier....

YES/NO

For implements
with gauge
wheels, lower
the position
control lever all
way.

Mower (mid-and
rear-mount type)
Hayrake, tedder...

TIRES, WHEELS AND BALLAST

TIRES, WHEELS AND BALLAST

TIRES

To avoid personal injury:
A

Do not attempt to mount a tire on a rim. This
should be done by a qualified person with the
proper equipment.

Always maintain the correct tire pressure.
Do not inflate tires above the recommended
pressure shown in the operator's manual.

Do not use tires other than those approved by
KUBOTA.

When you intend to mount different size of tires from
equipped ones, consult your dealer about front drive
gear ratio for details.
Excessive wear of tires may occur due to improper
gear ratio.

Inflation Pressure

Though the tire pressure is factory-set to the prescribed
level, it naturally drops slowly in the course of time. Thus,
check it everyday and inflate as necessary.

Maintain the maximum pressure in front tires, if using
a front loader or when equipped with a full load of front
weight.

Dual Tires

Dual tires are not approved.

WHEEL TREAD

To avoid personal injury:
A

Support tractor securely on stands before
removing a wheel.

Never operate tractor with a loose rim, wheel,
or axle.

Front Wheels

Front tread can not be adjusted.

Do not turn front discs to obtain wider tread.

Tire sizes

Inflation Pressure

Rear

26x12.00-12 Turf

26x12.00-12 Bar

26x12.00-12 Ind.

100kPa(1.0kgf/

)

120kPa(1.2kgf/

)

120kPa(1.2kgf/

)

Front

18x8.50-10 Turf

18x8.50-10 Bar

18x8.50-10 Ind.

120kPa(1.2kgf/

)

150kPa(1.5kgf/

)

150kPa(1.5kgf/

)

Tire

18x8.50-10 Turf, Bar, and Ind.

Tread

TIRES, WHEELS AND BALLAST

To avoid personal injury:
A

Before jacking up the tractor, park it on a firm
and level ground and chock the rear wheels.

Fix the front axle to keep it from swinging.

Select jacks that withstand the machine weight
and set them up as shown below.

Rear Wheels

Rear tread width can not be adjusted.

Do not turn rear discs to obtain wider tread.

Always attach tires as shown in the drawings.

If not attached as illustrated, transmission parts may
be damaged. When re-fitting or adjusting a wheel,
tighten the bolts to the following torques then recheck
after driving the tractor 200m (200yards), after one day
(8 hours) and thereafter every 50 hours (as per
maintenance chart).

Use the tapered bolts for wheels with beveled or
tapered holes.

To avoid personal injury:
A

Before jacking up the tractor, park it on a firm
and level ground and chock the front wheels.

Fix the front axle to keep it from swinging.

Select a jack that withstands the machine
weight and set it up as shown below.

(1) Front axle case
(2) Jack points

Tire

26x12.00-12 Turf, Bar, and Ind.

Tread

(1) Bolt

Front 149.2 to 179.0 N-m
(15.2 to 18.3 kgf-m)
Rear 108.5 to 130.2 N-m
(11.1 to 13.3 kgf-m)

(1) Frame
(2) Jack point

TIRES, WHEELS AND BALLAST

BALLAST

To avoid personal injury:
A

Additional ballast will be needed for
transporting heavy implements. When the
implement is raised, drive slowly over rough
ground, regardless of how much ballast is
used.

Do not fill the front wheels with liquid to
maintain steering control.

The ballast is not required when doing the normal
operations with the BX25DLB tractor, LA240A loader,
LA240A AU-SG loader and BT602 backhoe
connected in factory settings.

Front Ballast

Add weights if needed for stability and improve traction.
Heavy pulling and heavy rear mounted implements tend
to lift front wheels. Add enough ballast to maintain
steering control and prevent tip over.
Remove weight when no longer needed.

Do not overload tires.

Add no more weight than indicated in chart.

Rear Ballast

[Standard model]

To avoid personal injury:
A

For tractor stability and operator's safety, rear
ballast should be added to the rear of the
tractor in the form of 3-point counter weight
and rear wheel ballast. The amount of rear
ballast will depend on the application.

Liquid ballast in rear tires

Water and calcium chloride solution provides a safe and
economical ballast. Used properly, it will not damage tires,
tubes or rims. The addition of calcium chloride is
recommended to prevent the water from freezing. Use of
this method of weighting the wheels has full approval of
the tire manufacturers. See your tire dealer for this
service.
Liquid weight per tire (75 Percent filled)

When mounting a heavy implement, a liquid in the tire
may not be required.

Do not fill tires with water or solution more than 75% of
full capacity (to the level of valve stem at 12 o'clock
position).

To avoid damage of transmission, do not use rear
wheel weights and liquid ballast at the same time.

Do not add liquid ballast or any other weights to the
front tires.

While BT602 backhoe is installed on the tractor, liquid
ballast in the rear tires should be removed.

Maximum weight

125 kg

Implement as Counter Weight

Box Blade

Approx. 190 kg

Rear Blade

Rotary Tiller

Ballast Box

Tire sizes

26 x 12-12

Slush free at -10
Solid at -30
[Approx. 1 kg CaCl per 4 L of water]

45 kg

Slush free at -24
Solid at -47
[Approx. 1.5 kg CaCl per 4 L of water]

50 kg

Slush free at -47
Solid at -52
[Approx. 2.25 kg CaCl per 4 L of water]

56 kg

(1) Air
(2) Water
(3) Valve stem

(A) Correct : 75% Full
Air compresses like a cushion
(B) Incorrect : 100% Full
Water can not be compressed

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