Kubota BX2370 Instruction manual

BX1870,BX2370,BX2670,
RCK48-18BX,RCK54-23BX,
RCK60B-23BX,
RCK48P-18BX,RCK54P-23BX,
RCK54D-26BX,RCK60D-26BX,
LA203A,LA243A
WORKSHOP MANUAL
TRACTOR,MOWER,
FRONT LOADER
KiSC issued 02, 2017 A

TO THE READER
This Workshop Manual tells the servicing personnel about the mechanism, servicing and
maintenance of KUBOTA Tractor BX1870D, BX2370D, BX2670D, KUBOTA Rotary Mower
RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, RCK54P-23BX, RCK60D-26BX,
RCK54D-26BX and KUBOTA Front Loader LA203A, LA243A. It contains 4 parts: "Information",
"General", "Mechanism" and "Servicing".
Information
This section primarily contains information below.
• Safety First
• Safety Decal
• Specifications
• Dimensions
General
This section primarily contains information below.
• Engine Identification
• Model Identification
• General Precautions
• Maintenance Check List
• Check and Maintenance
• Special Tools
Mechanism
This section contains information on the structure and the function of the unit. Before you continue
with the subsequent sections, make sure that you read this section.
Refer to the latest version of Workshop Manual (Code No. 9Y021-01870 / 9Y021-18200) for the
diesel engine / tractor mechanism that this workshop manual does not include.
Servicing
This section primarily contains information below.
• Troubleshooting
• Servicing Specifications
• Tightening Torques
• Checking, Disassembling and Servicing
All illustrations, photographs and specifications contained in this manual are of the newest
information available at the time of publication.
KUBOTA reserves the right to change all information at any time without notice.
Since this manual includes many models, information or illustrations and photographs can show
more than one model.
December, 2012
© KUBOTA Corporation 2012
KiSC issued 02, 2017 A

Record of Revisions
For pdf, use search function {Search word} to find all the revised locations.
Last digit
of the
Code No.
Issue
month Main Revised Point and Corrective Measures {Search word} Reference
Page
12013.08 Change to the Quick Hitch type at "[2] FRONT LOADER (1) Bucket,
Boom and Hydraulic Cylinders". {Bucket (Quick Hitch)}
8-S6
22015.05 Added RCK54D-26BX and RCK60D-26BX Drive Over Mower Decks.
32016.03 Revise Maintenance Intervals G-17
42017.02 Changed Checking Hydraulic Pump Oil Flow 5-S6
KiSC issued 02, 2017 A

I INFORMATION
KiSC issued 02, 2017 A

CONTENTS
1. SAFETY FIRST .............................................................................................................................. I-1
2. SAFETY DECALS .......................................................................................................................... I-4
[1] BX TRACTOR .......................................................................................................................... I-4
[2] MOWER ................................................................................................................................... I-8
[3] FRONT LOADER ................................................................................................................... I-12
3. SPECIFICATIONS........................................................................................................................ I-14
[1] BX TRACTOR ........................................................................................................................ I-14
[2] MOWER ................................................................................................................................. I-15
(1) RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX and RCK54P-23BX ........ I-15
(2) RCK54D-26BX and RCK60D-26BX ................................................................................. I-16
[3] FRONT LOADER ................................................................................................................... I-17
4. TRAVELING SPEEDS.................................................................................................................. I-20
5. DIMENSIONS ............................................................................................................................... I-21
INFORMATION
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-1
1. SAFETY FIRST
WSM000001INI0001US1
BEFORE YOU START SERVICE
• Read all instructions and safety instructions in this
manual and on your machine safety decals.
• Clean the work area and machine.
• Park the machine on a stable and level ground, and
set the parking brake.
• Lower the implement to the ground.
• Stop the engine, then remove the key.
• Disconnect the battery negative cable.
• Hang a "DO NOT OPERATE" tag in the operator
station.
WSM000001INI0010US0
START SAFELY
• Do not do the procedures below when you start the
engine.
– short across starter terminals
– bypass the safety start switch
• Do not alter or remove any part of machine safety
system.
• Before you start the engine, make sure that all shift
levers are in neutral positions or in disengaged
positions.
• Do not start the engine when you stay on the ground.
Start the engine only from operator's seat.
WSM000001INI0015US0
SAFETY FIRST
• This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the
machine itself to warn of the possibility of personal injury. Read these instructions carefully.
• It is essential that you read the instructions and safety regulations before you try to repair or use this
unit.
DANGER
• Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
• Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
• Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate
injury.
IMPORTANT
• Indicates that equipment or property damage could result if instructions are not followed.
NOTE
• Gives helpful information.
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-2
OPERATE SAFELY
• Do not use the machine after you consume alcohol
or medication or when you are tired.
• Put on applicable clothing and safety equipment.
• Use applicable tools only. Do not use alternative
tools or parts.
• When 2 or more persons do servicing, make sure
that you do it safely.
• Do not operate below the machine that only a jack
holds. Always use a safety stand to hold the
machine.
• Do not touch the hot parts or parts that turn when the
engine operates.
• Do not remove the radiator cap when the engine
operates, or immediately after it stops. If not, hot
water can spout out from the radiator. Only remove
the radiator cap when it is at a sufficiently low
temperature to touch with bare hands. Slowly loosen
the cap to release the pressure before you remove it
fully.
• Released fluid (fuel or hydraulic oil) under pressure
can cause damage to the skin and cause serious
injury. Release the pressure before you disconnect
hydraulic or fuel lines. Tighten all connections before
you apply the pressure.
• Do not open a fuel system under high pressure.
The fluid under high pressure that stays in fuel lines
can cause serious injury. Do not disconnect or repair
the fuel lines, sensors, or any other components
between the fuel pump and injectors on engines with
a common rail fuel system under high pressure.
• Put on an applicable ear protective device (earmuffs
or earplugs) to prevent injury against loud noises.
• Be careful about electric shock. The engine
generates a high voltage of more than DC100 V in
the ECU and is applied to the injector.
WSM000001INI0012US0
PREVENT A FIRE
• Fuel is very flammable and explosive under some
conditions. Do not smoke or let flames or sparks in
your work area.
• To prevent sparks from an accidental short circuit,
always disconnect the battery negative cable first
and connect it last.
• The battery gas can cause an explosion. Keep the
sparks and open flame away from the top of battery,
especially when you charge the battery.
• Make sure that you do not spill fuel on the engine.
WSM000001INI0005US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-3
KEEP A GOOD AIRFLOW IN THE WORK AREA
• If the engine is in operation, make sure that the area
has good airflow. Do not operate the engine in a
closed area. The exhaust gas contains poisonous
carbon monoxide.
WSM000001INI0006US0
DISCARD FLUIDS CORRECTLY
• Do not discard fluids on the ground, down the drain,
into a stream, pond, or lake. Obey related
environmental protection regulations when you
discard oil, fuel, coolant, electrolyte and other
dangerous waste.
WSM000001INI0007US0
PREVENT ACID BURNS
• Keep electrolyte away from your eyes, hands and
clothing. Sulfuric acid in battery electrolyte is
poisonous and it can burn your skin and clothing and
cause blindness. If you spill electrolyte on yourself,
clean yourself with water, and get medical aid
immediately.
WSM000001INI0008US0
PREPARE FOR EMERGENCIES
• Keep a first aid kit and fire extinguisher ready at all
times.
• Keep the emergency contact telephone numbers
near your telephone at all times.
WSM000001INI0009US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-4
2. SAFETY DECALS
The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not
on the machine, replace it. The decal part number is listed in the parts list. WSM000001INI0013US0
[1] BX TRACTOR
9Y1210855INI0001US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-5
9Y1210855INI0002US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-6
9Y1210855INI0003US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-7
9Y1210855INI0004US0
CARE OF DANGER, WARNING AND CAUTION LABELS
1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels.
4. If a component with danger, warning and caution label(s) affixed is replaced with new part, make sure new label(s)
is (are) attached in the same location(s) as the replaced component.
5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressing any bubbles to
outside edge.
9Y1210855INI0005US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-8
[2] MOWER
9Y1210855INI0006US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-9
9Y1210855INI0007US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-10
9Y1210855INI0008US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-11
9Y1210855INI0018US0
CARE OF DANGER, WARNING AND CAUTION LABELS
1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels.
4. If a component with danger, warning and caution label(s) affixed is replaced with new part, make sure new label(s)
is (are) attached in the same location(s) as the replaced component.
5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressing any bubbles to
outside edge.
9Y1210855INI0005US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-12
[3] FRONT LOADER
9Y1210855INI0009US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-13
9Y1210855INI0010US0
CARE OF DANGER, WARNING AND CAUTION LABELS
1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels.
4. If a component with danger, warning and caution label(s) affixed is replaced with new part, make sure new label(s)
is (are) attached in the same location(s) as the replaced component.
5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressing any bubbles to
outside edge.
9Y1210855INI0005US0
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-14
3. SPECIFICATIONS
[1] BX TRACTOR
Model BX1870D BX2370D BX2670D
PTO power 10.2 kW (13.7 HP)* 13.2 kW (17.7 HP)* 14.5 kW (19.5 HP)*
Engine
Maker KUBOTA
Model D722-E4-BX-1 D902-E4-BX-1 D1005-E4-BX-1
Type Indirect Injection, vertical, water-cooled, 4-cycle diesel
Number of cylinders 3
Bore and stroke 67 × 68 mm
(2.64 × 2.68 in.)
72 × 73.6 mm
(2.83 × 2.90 in.)
76 × 73.6 mm
(2.99 × 2.90 in.)
Total displacement 719 cm3 (43.9 cu.in.) 898 cm3 (54.8 cu.in.) 1001 cm3 (61.1 cu.in.)
Engine gross power 13.4 kW (18.0 HP)** 17.1 kW (23.0 HP)** 19.0 kW (25.5 HP)**
Rated revolution 3200 min-1 (rpm)
Maximum torque 44.9 N·m
(4.6 kgf·m, 33.1 lbf·ft)
56.1 N·m
(5.7 kgf·m, 41.4 lbf·ft)
60.2 N·m
(6.1 kgf·m, 44.4 lbf·ft)
Battery 12 V, RC: 55 min.,
CCA: 450 A 12 V, RC: 80 min., CCA: 540 A
Fuel Diesel fuel No. 1 [below −10 °C (14 °F)], Diesel fuel No. 2 [above −10 °C (14 °F)]
Capacities
Fuel tank 25 L (6.6 U.S.gals, 5.5 Imp.gals)
Engine crankcase (with filter) 2.9 L
(3.1 U.S.qts, 2.6 Imp.qts)
3.1 L
(3.3 U.S.qts, 2.7 Imp.qts)
3.5 L
(3.7 U.S.qts, 3.1 Imp.qts)
Engine coolant 2.5 L
(2.6 U.S.qts, 2.2 Imp.qts)
2.7 L
(2.8 U.S.qts, 2.4 Imp.qts)
2.9 L
(3.1 U.S.qts, 2.6 Imp.qts)
Recovery tank 0.4 L (0.4 U.S.qts, 0.4 Imp.qts)
Transmission case 11.6 L (3.06 U.S.gals, 2.55 Imp.gals)
Dimensions
Overall length (without 3P) 2035 mm (80.1 in.) 2120 mm (83.5 in.)
Overall length (with 3P) 2340 mm (92.1 in.) 2425 mm (95.5 in.)
Overall width (min. tread) 1145 mm (45.1 in.)
Overall height (with ROPS) 2190 mm (86.2 in.) 2215 mm (87.2 in.)
Overall height (Top of seat) 1230 mm (48.4 in.) 1255 mm (49.4 in.) 1330 mm (52.4 in.)
Wheel base 1340 mm (52.8 in.) 1400 mm (55.1 in.)
Minimum ground clearance 150 mm (5.9 in.) 175 mm (6.9 in.)
Tread Front 880 mm (34.6 in.) 930 mm (36.3 in.)
Rear 820 mm (32.2 in.)
Weight (with ROPS) 610 kg (1345 lbs) 640 kg (1410 lbs) 665 kg (1466 lbs)
Clutch N / A
Travelling
system
Tires Front 16 × 7.50 – 8 18 × 8.50 – 10
Rear 24 × 12.00 – 12 26 × 12.00 – 12
Steering Hydrostatic type power steering
Transmission Main: hydrostatic transmission, High-Low gear shift (2 forward and 2 reverse)
Brake Wet disk type
Min. turning radius
(without brake) 2.18 m (7.15 feet) 2.3 m (7.5 feet)
KiSC issued 02, 2017 A

INFORMATION
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
I-15
NOTE
• The company reserves the right to change the specifications without notice.
* Manufacture's estimate:
** SAE J 1995
*** See and check "IMPLEMENT LIMITATIONS". 9Y1210855INI0011US0
[2] MOWER
(1) RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX and
RCK54P-23BX
9Y1210855INI0012US0
Hydraulic unit
Hydraulic control system Directional control, auto-return lever system
Pump capacity 23.5 L/min. (6.2 U.S.gals/min., 5.2 Imp.gals/min.)
System pressure 12.3 to 12.8 MPa (126 to 130 kgf/cm2, 1790 to 1850 psi)
Three point hitch SAE Category I
Three point
hitch. Max.lift
force
At lift points 5390 N (1210 lbs)***
24 in. behind lift
points 3040 N (680 lbs)***
Remote
control valve
coupler
(Rear: Option)
System 2 valves
Coupler ISO 7341 series A
Remote
control valve
coupler
(Front: Option)
System 2 valves
Coupler ISO 7341-1 series B
PTO
Rear PTO shaft SAE 1-3/8, 6 splines
Revolution 1 speed (540 min-1 (rpm) at engine 3142 min-1 (rpm))
Mid PTO shaft USA No. 5 (KUBOTA 10-tooth) involute spline
Revolution 1 speed (2500 min-1 (rpm) at engine 3043 min-1 (rpm))
Model BX1870D BX2370D BX2670D
Model RCK48-18BX RCK54-23BX RCK60B-23BX RCK48P-18BX RCK54P-23BX
Suitable tractor BX1870D BX1870D
BX2370D
BX2370D
BX2670D BX1870D BX2370D
Mounting method
Quick-Joint, Parallel linkage
Suspended linkage
Self-balance
suspended
linkage
Suspended linkage
Adjustment of cutting height Dial gauge
Cutting width 1219 mm
(48 in.)
1372 mm
(54 in.)
1524 mm
(60 in.)
1225 mm
(48 in.)
1375 mm
(54 in.)
Cutting height 25 to 102 mm (1.0 to 4.0 in.)
Weight (Approx.) 75 kg (165 lbs) 95 kg (210 lbs) 115 kg (250 lbs) 82 kg (181 lbs) 86 kg (190 lbs)
Blade spindle speed 54.7 r/s
(3281 rpm)
49.5 r/s
(2969 rpm)
44.1 r/s
(2647 rpm)
54.7 r/s
(3281 rpm)
49.5 r/s
(2969 rpm)
Blade tip velocity 72.8 m/s
(14331 fpm)
73.8 m/s
(14527 fpm)
72.5 m/s
(14271 fpm)
72.8 m/s
(14331 fpm)
73.8 m/s
(14527 fpm)
Blade length 424 mm
(16.7 in.)
475 mm
(18.7 in.)
523 mm
(20.6 in.)
424 mm
(16.7 in.)
475 mm
(18.7 in.)
Number of blades 3
Dimensions
Overall length 895 mm
(35.2 in.)
928 mm
(36.5 in.)
1000 mm
(39.4 in.)
881 mm
(34.7 in.)
908 mm
(35.7 in.)
Overall width 1544 mm
(60.8 in.)
1780 mm
(66.5 in.)
1930 mm
(76.0 in.)
1550 mm
(61.0 in.)
1700 mm
(67.0 in.)
Overall height (Min.) 268 mm
(10.5 in.)
281 mm
(11.0 in.)
281 mm
(11.0 in.)
291 mm
(11.5 in.)
291 mm
(11.5 in.)
KiSC issued 02, 2017 A