Kubota WSM STa-30, WSM STa-35 Workshop Manual
WORKSHOP MANUAL
KiSC issued 11, 2006 A
TRACTOR
STα-30,STα-35
TO THE READER
KiSC issued 11, 2006 A
This Workshop Manual has been prepared to provide servicing personnel with
information on t he mechanism, service and maintenance of KUBOTA T ractor STα-30
and STα-35. It is divided into two parts, “Mechanism” and “Servicing” for each section.
■ Mechanism
Information on the construction and function are included. This part should be
understood before proceeding with troubleshooting, disassembling and servicing.
■ Servicing
Under the heading “General” section comes general precautions, check and
maintenance and special tools. Other section, there are troubleshooting, servicing
specification lists, checking and adjusting, disassembling and assembling, and servicing
which cover procedures, pr ecauti ons , fac tor y spe cifi ca tion s and allowa bl e limits .
All information illustrations and specifications contained in this manual are based on
the latest production information available at the time of publication.
The right is reserved to make changes in all information at any time without notice
September 2000
© KUBOTA Corporation 2000
STα-30 · STα-35, WSM
SAFETY FIRST
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and decals 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 attempt 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, may result in
minor or moderate injury.
■ IMPORTANT : Indicates that equipment or property damage could result if instructions are not
followed.
■ NOTE : Gives helpful information.
BEFORE SERVICING AND REPAIRING
• 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 firm and level ground, and set
the parking brake.
• Lower the implement to the ground.
• Stop the engine, and remove the key.
• Disconnect the battery negative cable.
• Hang a “DO NOT OPERATE” tag in operator station.
1
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
SAFETY STARTING
• Do not start the engine by shorting across starter
terminals or bypassing the safety start switch.
• Do not alter or remove any part of machine safety
system.
• Before starting the engine, make sure that all shift
levers are in neutral positions or in disengaged
positions.
• Never start the engine while standing on ground.
Start the engine only from operator’s seat.
SAFETY WORKING
• Do not work on the machine while under the influence
of alcohol, medication , or other substances or while
fatigued.
• Wear close fitting clothing and safety equipment
appropriate to the job.
• Use tools appropriate to the work. Markshift tools,
parts, and procedures are not recommended.
• When servicing is performed together by two or more
persons, take care to perform all work safely.
• Do not work under the machine that is supported
solely by a jack. Always support the machine by
safety stands.
• Do not touch the rotating or hot parts while the engine
is running.
• Never remove the radiator cap while the engine is
running, or immediately after stopping. Otherwise,
hot water will spout out fr om radiator. Only remove
radiator cap when cool enough to touch with bare
hands. Slowly loosen the cap to first stop to relieve
pressure before removing completely.
• Escaping fluid (fuel or hydraulic oil) un der pressure
can penetrate the skin causing serious injury. Relieve
pressure before disconnecting hydraulic or fuel lines.
Tighten all connections before applying pressure.
AVOID FIRES
• Fuel is extremely flammable and explosive under
certain condition s. Do not smoke or allow flames o r
sparks in your working area.
• To avoid sparks from an accidental short circuit,
always disconnect the battery negative cable first and
connect it last.
• Battery gas can explode. Keep sparks and open
flame away from the top of b attery, especially when
charging the battery.
• Mark sure that no fuel has been spilled on the engine.
2
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
VENTILATE WORK AREA
• If the engine must be running to do some work, make
sure the area is well ventilated. Never run the engine
in a closed area. The exhaust gas contains
poisonous carbon monoxide.
PREVENT ACID BURNS
• Sulfuric acid in battery electr olyte is po isonous. It is
strong enough to burn skin, clothing and cause
blindness if splashed into eyes. Keep electrolyte
away from eyes, hands and clothing. If you spill
electrolyte on yourself, flush with water, and get
medical attention immediately.
DISPOSE OF FLUIDS PROPERLY
• Do not pour fluids into the ground, down a drain, or
into a stream, pond, or lake. Observe relevant
environmental prot ectio n regulati ons whe n disp osing
of oil, fuel, coolant, electrolyte and other harmful
waste.
PREPARE FOR EMERGENCIES
• Keep a first aid kit and fire extingui sher handy at all
times.
• Keep emergency numbers for doctors, ambulance
service, hospital and fire department near your
telephone.
3
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
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.
4
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
5
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SAFETY INSTRUCTIONS
6
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
SPECIFICATIONS
Model STα-30 STα-35
PTO power 17.3 kW (23.5 PS) 21.0 kW (28.5 PS)
Maker KUBOTA
Model D1463-M-ST D1703-M-ST
Type ETVCS, Indirect Injection. Vertical, water-cooled, 4-cycle diesel
Number of cylinders 3
Bore and stroke 82 × 92.4 mm (3.23 × 3.64 in.) 87 × 92.4 mm (3.43 × 3.64 in.)
Total displacement 1463 cm
Engine net power
Engine
Capacities
Tires
Dimensions
Weight (with ROPS)
Minimum turning radius
(with bi-speed turn)
Clutch Dry single plate
(ECE-R24)
SAE gross 22.4 kW (30 HP) 26.8 kW (35.9 HP)
Rated revolution 45 r/s (2700 min
Maximum to rque 96.5 N·m (9.85 kgf·m) / 1500 min
Battery 12 V, RC : 110 min, CCA : 550 A
Starting system Electric starting with cell starter 12 V, 1.4 kW
Lubricating system Forced lubrication by trochoidal pump
Cooling system Pressurized radiator, forced circulation with water pump
Fuel Diesel fuel No. 2-D [above −10 °C (14 °F)], Diesel fuel No. 1 [below −10 °C (14 °F]
Fuel tank 29.5 L (7.79 U.S.gals., 6.49 Imp.gals.)
Engine crankcase
(with filter)
Engine coolant
(with recovery tank)
Transmission case 18.5 L (4.89 U.S.gals., 4.07 Imp.gals.)
Front axle case 4.0 L (1.06 U.S.gals., 0.88 Imp.gals.)
Front
Rear 12.4-16 9.5-22 13.6-16 12.4-16 9.5-22 13.6-16
Overall length (with 3P) 2870 mm (113 in.)
Overall width (minimum
tread)
Overall height (with
ROPS)
Wheel base 1610 mm (63.4 in.)
Minimum ground
clearance (Mid-PTO
case)
Front 1020 mm (40.2 in.)
Tread
Rear
with brake 2.2 m (7.2 feet)
without
brake
Farm
6-12
1465 mm
(57.7 in.)
2330 mm
(91.7 in.)
215 mm
(8.5 in.)
1148 mm
(45.2 in.)
975 kg
(2150 lbs)
3
(89.28 cu.in.) 1647 cm3 (100.51 cu.in.)
21.2 kW 25.5 kW
-1
(rpm))
-1
(rpm)) 111 N·m (11.3 kgf·m) / 1500 min-1 (rpm))
4.5 L (1.19 U.S.gals., 0.99 Imp.gals.)
5.8 L (1.56 U.S.gals., 1.28 Imp.gals.)
Farm
6.00-12
1220 mm
(48.1 in.)
2350 mm
(92.5 in.)
235 mm
(9.3 in.)
950, 1070 mm
(37.4, 42.1 in.)
965 kg
(2130 lbs)
Turf
24 × 8.50-14
1310 mm
(51.6 in.)
2345 mm
(92.3 in.)
230 mm
(9.1 in.)
965, 1055 mm
(38.0, 41.5 in.)
985 kg
(2170 lbs)
2.5 m (8.2 feet)
Farm
6-12
1465 mm
(57.7 in.)
2330 mm
(91.7 in.)
215 mm
(8.5 in.)
1148 mm
(45.2 in.)
975 kg
(2150 lbs)
Farm
6.00-12
1220 mm
(48.1 in.)
2350 mm
(92.5 in.)
235 mm
(9.3 in.)
950, 1070 mm
(37.4, 42.1 in.)
965 kg
(2130 lbs)
SPECIFICATIONS
Turf
24 × 8.50-14
1310 mm
(51.6 in.)
2345 mm
(92.3 in.)
230 mm
(9.1 in.)
965, 1055 mm
(38.0, 41.5 in.)
985 kg
(2170 lbs)
W1028117
7
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
Model STα-30 STα-35
Steering Hydrostatic power steering
Pump capacity (power
Travelling
system
Hydraulic
system
PTO system
Note : * Manufacture’s estimate the company reserves the right to change the specifications without notice.
steering)
Transmission Main-hydrostatic transmission, range gear shift (3 forward and 3 reverse)
Brake Wet disk type
Differential Bevel gear
Hydraulic control system Position control
Pump capacity 23 L/min. (6.1 U.S.gals./min., 5.1 Imp.gals./min.)
Three point hitch SAE Category I
At lift points 1150 kg (2535 lbs)
Max. lift
force
Rear
Mid.
24 in.
behind lift
points
PTO shaft S AE 1-3/ 8, 6 splines
Revolution 540 / 2673 min
PTO shaft USA No. 5 (KUBOTA 10-tooth) involute spline
Revolution 1700 / 2710 min
14.0 L/min. (3.7 U.S.gals./min., 3.1 Imp.gals./min.)
890 kg (1962 lbs)
-1
(rpm), 800 / 2738 min-1 (rpm)
-1
(rpm), 2500 / 2755 min-1 (rpm)
SPECIFICATIONS
W1031009
8
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
TRAVELLING SPEED
TRAVELLING SPEED
Model STα-30 · STα-35
Tire size (Rear) 9.5-22 12.4-16 13.6-16
Range gear shift lever km/h (mile/h) km/h (mile/h) km/h (mile/h)
1 (Low) 0 to 6.6 (0 to 4.1) 0 to 6.3 (0 to 3.9) 0 to 6.5 (0 to 4.0)
Forward
(At rated engine rpm)
Reverse
(At rated engine rpm)
The company reserves the right to change the spe cifi ca tion s with out notic e.
2 (Middle) 0 to 12.7 (0 to 7.9) 0 to 12.2 (0 to 7.6) 0 to 12.6 (0 to 7.8)
3 (High) 0 to 28.4 (0 to 17.6) 0 to 27.2 (0 to 17.0) 0 to 28.2 (0 to 17.5)
Max. Speed
(at 2850 engine rpm)
1 (Low) 0 to 4.8 (0 to 3.0) 0 to 4.6 (0 to 2.9) 0 to 4.7 (0 to 2.9)
2 (Middle) 0 to 9.2 (0 to 5.7) 0 to 8.8 (0 to 5.5) 0 to 9.2 (0 to 5.7)
3 (High) 0 to 20.6 (0 to 12.8) 0 to 19.7 (0 to 12.2) 0 to 20.4 (0 to 12.7)
Max. Speed
(at 2850 engine rpm)
29.9 (18.6) 28.7 (17.8) 29.8 (18.5)
21.7 (13.5) 20.8 (12.9) 21.6 (13.4)
W1035065
9
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
DIMENSIONS
DIMENSIONS
10
G GENERAL
KiSC issued 11, 2006 A
GENERAL
KiSC issued 11, 2006 A
CONTENTS
1. FEATURES...................................................................................................... G-1
2. TRACTOR IDENTIFICATION ......................................................................... G-2
3. GENERAL PRECAUTIONS ............................................................................ G-3
4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING..G-4
[1] WIRING...................................................................................................... G-4
[2] BATTERY................................................................................................... G-6
[3] FUSE.......................................................................................................... G-6
[4] CONNECTOR............................................................................................ G-6
[5] HANDLING OF CIRCUIT TESTER......................................................... G-7
5. LUBRICANTS FUEL AND COOLANT .......................................................... G-8
6. TIGHTENING TORQUES ............................. ....... ...... ....... ...... ....... ...... ....... .... G- 9
[1] GENERAL USE SCREWS, BOLTS AND NUTS................................... G-9
[2] STUD BOLTS............................................................................................ G-9
7. MAINTENANCE............................................................................................. G-10
8. CHECK AND MAINTENANCE......... ...... ...... ....... ...... ....... ...... ....... ............... G-11
[1] DAILY CHECK........................................................................................ G-11
[2] CHECK POINTS OF INITIAL 50 HOURS........................................... G-12
[3] CHECK POINTS OF EVERY 50 HOURS........................................... G-15
[4] CHECK POINTS OF EVERY 100 HOURS......................................... G-17
[5] CHECK POINTS OF EVERY 200 HOURS......................................... G-22
[6] CHECK POINTS OF EVERY 400 HOURS......................................... G-24
[7] CHECK POINTS OF EVERY 600 HOURS......................................... G-24
[8] CHECK POINTS OF EVERY 800 HOURS......................................... G-25
[9] CHECK POINTS OF EVERY 1 YEAR ................................................ G-25
[10]CHECK POINTS OF EVERY 2 YEARS.............................................. G-25
[11]OTHERS .................................................................................................. G-28
9. SPECIAL TOOLS.......................................................................................... G-30
[1] SPECIAL TOOLS FOR ENGINE .......................................................... G-30
[2] SPECIAL TOOLS FOR TRACTOR....................................................... G-36
10. TIRES............................................................................................................. G-39
[1] TIRE PRESSURE................................................................................... G-39
[2] TREAD..................................................................................................... G-39
(1) Front Wheels...................................................................................... G-40
(2) Rear Wheels ...................................................................................... G-40
[3] TIRE LIQUID INJECTION...................................................................... G-41
11. IMPLEMENT LIMITATIONS.......................................................................... G-43
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
1. FEATURES
G GENERAL
1. Hydraulic Power Steering
2. E-TVCS (Three Vortex Combustion System) Diesel Engine
3. Engine Key Shut-Off System
4. Hydrostatic Transmission (HST)
5. 3 Range of Speed
6. Bi-speed Turn
7. Cruise Control
8. Wet Disc Brake
9. Standard mid -PT O
10.Simultaneous Mounting of Both the Mid. Mount Mower and Front Loader
11.Combination Panel of Easy Checker
12.Large Hydraulic Pump
13.Position Control Valve
14.Hydraulic Block Type Outlet
15.Foldable ROPS
G-1
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
2. TRACTOR IDENTIFICATION
When contacting your local KUBOTA distributor, always specify
engine serial number, tractor serial number and hour meter reading.
(1) Tractor Identification Plate
(2) Tractor Serial Number
G GENERAL
(3) Engine Serial Number
(4) Hour Meter
W1010805
G-2
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
3. GENERAL PRECAUTIONS
• During disasse mbly, care fully arrang e removed pa rts in a clean
area to prevent confusion later. Screws, bolts and nuts should be
installed in their original position to prevent reassembly errors.
• When special tools are requir ed, use KUBOTA ge nuine special
tools. Special tools which are not frequently used should be
made according to the drawings provided.
• Before disassembling or servicing electrical wires, always
disconnect the ground cable from the battery first.
• Remove oil and dirt from parts before measuring.
• Use only KUBOTA genuine parts for parts replacement to
maintain machine performance and to assure safety.
• Gaskets and O-rings must be replaced during reassembly.
Apply grease to new O-rings or oil seals before assembling.
See the figure left side.
• When reassemblin g external snap rings or internal snap rings,
they must be po sitioned so that sharp edge fa ces against the
direction from which a force is applied. See the figure left side.
• When inserting sp ring pins, their splits must face the direct ion
from which a force is applied. See the figure left side.
• To prevent dama ge to the hydrauli c system, use only s pecified
fluid or equivalent.
(1) Grease
(2) Force
(3) Sharp Edge
(4) Axial Force
(5) Rotating Movement
G GENERAL
(A) External Snap Ring
(B) Internal Snap Ring
W1010904
G-3
STα-30 · STα-35, WSM
IMPORTANT■
KiSC issued 11, 2006 A
G GENERAL
4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS
AND WIRING
To ensure safety and prevent damage to the machine and
surrounding equipm ent, heed the fo llowing prec autions in hand ling
electrical parts and wiring.
• Check electrical wiring for damage and loosened
connection every year. To this end, educate the customer to
do his or her own check an d at the same time recommend
the dealer to perform periodic check for a fee.
• Do not attempt to modify or remodel any electrical parts and
wiring.
• When removing the battery cables, disconnect the negative
cable first. When installing the battery cables, connect the
positive cable first.
(1) Negative Terminal (2) Positive Terminal
W1011114
[1] WIRING
• Securely tighten wiring terminals.
(1) Correct
(Securely Tighten)
(2) Incorrect
(Loosening Leads to Faulty Contact)
W1011216
• Do not let wiring contact dangerous part.
(1) Wiring (Correct)
(2) Wiring (Incorrect)
(3) Dangerous Part
(4) Dangerous Part
• Securely insert gro mm et.
(1) Grommet (A) Correct
(B) Incorrect
W1011313
W1011388
G-4
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
G GENERAL
• Securely clamp, being careful not to damage wiring.
(1) Clamp
• Wind Clamp Spirally
(2) Wire Harness
(3) Clamp
(4) Welding Dent
W1011458
• Clamp wiring so that there is no twist, unnecessary sag, or
excessive tension, except for movable part, where sag be
required.
(1) Wiring
(2) Clamp
(A) Correct
(B) Incorrect
W1011587
• In installing a part, take care not to get wiring caught by it.
(1) Wiring (A) Incorrect
W1011670
• After installing wiring, check protection of terminals and clamped
condition of wiring, only connect battery.
(1) Cover
• Securely Install Cover
W1011735
G-5
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
[2] BATTERY
[3] FUSE
G GENERAL
• Take care not to confuse positive and negative terminal posts.
• When removing battery cables, disconnec t negative cable first.
When installing battery cables, check for polarity and connect
positive cable first.
• Do not inst all any battery with capacity other th an is specified
(Ah).
• After connecting cables to battery terminal posts, apply high
temperature greas e to them and se curely instal l term inal co vers
on them.
• Do not allow dirt and dust to collect on battery.
CAUTION
• Take care not to let battery liquid spill on your skin and
clothes. If contaminated, wash it off with water immediately.
• Before recharging the battery, remove it from the machine.
• Before recharging, remove cell caps.
• Do recharging in a we ll-ventilated place where there is no
open flame nearby, as hydrogen gas and oxygen are formed.
W1011816
[4] CONNECTOR
• Use fuses with specified capacity.
Neither too large or small capacity fuse is acceptable.
• Never use steel or copper wire in place of fuse.
• Do not install working light, radio set, etc. on machine which is not
provided with reserve power supply.
• Do not install accessories if fuse capacity of reserve power
supply is exceeded.
(1) Fuse (2) Slow Blow Fuse
W1012092
• For connector with lock, push lock to separate.
(A) Push
W1012211
• In separating connectors, do not pull wire harnesses.
• Hold connector bodies to separate.
(A) Correct (B) Incorrect
W1012272
G-6
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
G GENERAL
• Use sandpaper to remove rust from terminals.
• Repair deformed terminal. Make certain there is no terminal
being exposed or displaced.
(1) Exposed Terminal
(2) Deformed Terminal
(3) Sandpaper
(4) Rust
W1012346
• Make certain that there is no female connector being too open.
(A) Correct (B) Incorrect
W1012430
• Make certain plastic cover is large enough to cover whole
connector.
(1) Cover (A) Correct
[5] HANDLING OF CIRCUIT TESTER
• Use tester correctly following manual provided with tester.
• Check for polarity and range.
(B) Incorrect
W1012519
W1012684
G-7
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
5. LUBRICANTS FUEL AND COOLANT
G GENERAL
Place
1 Fuel tank
Coolant (with recovery
2
tank)
Engine crankcase
3
(with filter)
4 Transmission case
5 Front axle case
Place No. of greasing point Capacity T ype of grease
Brake pedal shaft 1
Clutch pedal shaft 1
6
Top link 2
Lift rod 1
Battery terminal 2 Moderate amount
STα-30 STα-35
Capacity
29.5 L
7.79 U.S.gals.
6.49 Imp.gals.
5.8 L
1.56 U.S.gals.
1.28 Imp.gals.
4.5 L
1.19 U.S.gals.
0.99 Imp.gals.
18.5 L
4.89 U.S.gals.
4.07 Imp.gals.
4.0 L
1.06 U.S.gals.
0.88 Imp.gals.
No. 2-D diesel fuel
No. 1-D diesel fuel if temperature is below
−10 °C (14 °F)
Fresh clean water (soft water) with anti-freeze
Engine oil : API service CC or CD class
Below 0 °C (32 °F) : SAE10W, 10W-30 or
10W-40
0 to 25 °C (32 to 77 °F): SAE20, 10W-30 or
10W-40
Above 25 °C (77 °F): SAE30, 10W-30 or
10W-40
KUBOTA SUPER UDT fluid*
KUBOTA SUPER UDT fluid* or SAE80, 90 gear
oil
Grease
Until grease overflows
Lubricants, fuel and coolant
Multipurpose type
grease
* KUBOTA original transmission hydraulic fluid.
G-8
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
G GENERAL
6. TIGHTENING TORQUES
Screws, bolts and nuts whose ti ghtening to rques are not specifi ed in thi s Workshop Manual s hould be t ightened
according to the table below.
[1] GENERAL USE SCREWS, BOLTS AND NUTS
Indication on t o p of
bolt
Material of bolt SS400, S20C S43C, S48C
Material of opponent
part
Unit
Diameter
M6
(6 mm, 0.24 in.)
M8
(8 mm, 0.31 in.)
M10
(10 mm, 0.39 in.)
M12
(12 mm, 0.47 in.)
M14
(14 mm, 0.55 in.)
M16
(16 mm, 0.63 in.)
M18
(18 mm, 0.71 in.)
M20
(20 mm, 0.79 in.)
No-grade or 4T 7T 9T
Ordinariness Aluminum Ordinariness Aluminum Ordinariness
N·m kgf·m ft-lbs N·m kgf·m ft-lbs N·m kgf·m ft-lbs N·m kgf·m ft-lbs N·m kgf·m ft-lbs
7.85
0.80
5.79
7.85
0.80
5.79
9.81
1.00
to
9.31
17.7
to
20.5
39.3
to
45.1
62.8
to
72.5
108
to
125
167
to
191
246
to
284
334
to
392
to
0.95
1.8
to
2.1
4.0
to
4.6
6.4
to
7.4
11.0
to
12.8
17.0
to
19.5
25.0
to
29.0
34.0
to
40.0
to
6.87
13.1
to
15.1
29.0
to
33.2
46.3
to
53.5
79.6
to
92.5
123
to
141
181
to
209
246
to
289
to
to
to
8.82
0.90
6.50
16.7
1.7
12.3
to
to
19.6
2.0
31.4
3.2
to
34.3
3.5
–––
–––
–––
–––
–––
to
14.4
23.2
to
to
25.3
to
11.2
23.6
to
27.4
48.1
to
55.8
77.5
to
90.2
124
to
147
197
to
225
275
to
318
368
to
431
to
1.15
2.4
to
2.8
4.9
to
5.7
7.9
to
9.2
12.6
to
15.0
20.0
to
23.0
28.0
to
32.5
37.5
to
44.0
7.24
to
8.31
17.4
to
20.2
35.5
to
41.2
57.2
to
66.5
91.2
to
108
145
to
166
203
to
235
272
to
318
7.85
0.80
to
0.90
1.8
to
2.1
4.0
to
4.5
6.4
to
7.4
5.79
to
6.50
13.1
to
15.1
29.0
to
32.5
46.3
to
53.5
to
8.82
17.7
to
20.5
39.3
to
44.1
62.8
to
72.5
–––
–––
–––
–––
12.3
to
14.2
29.5
to
34.3
60.9
to
70.6
103
to
117
167
to
196
260
to
304
344
to
402
491
to
568
SCr435,
SCM435
1.25
to
1.45
3.0
to
3.5
6.2
to
7.2
10.5
to
12.0
17.0
to
20.0
26.5
to
31.0
35.0
to
41.0
50.0
to
58.0
W1034542
9.05
to
10.4
21.7
to
25.3
44.9
to
52.0
76.0
to
86.8
123
to
144
192
to
224
254
to
296
362
to
419
[2] STUD BOLTS
Material of opponent
part
Unit
Diameter
M8
(8 mm, 0.31 in.)
M10
(10 mm, 0.39 in.)
M12
(12 mm, 0.47 in.)
Ordinariness Aluminum
N·m kgf·m ft-lbs N·m kgf·m ft-lbs
11.8
to
15.6
24.6
to
31.3
29.5
to
49.0
1.2
to
1.6
2.5
to
3.2
3.0
to
5.0
8.68
8.82
to
11.5
18.1
23.1
21.7
36.1
to
11.8
19.7
to
to
25.4
to
31.4 3.2 23.1
0.90
to
1.2
2.0
to
2.6
6.51
to
8.67
14.5
to
18.8
W1048139
G-9
STα-30 · STα-35, WSM
IMPORTANT■
KiSC issued 11, 2006 A
7. MAINTENANCE
G GENERAL
Period
No.
Item
1 Engine oil Change ★✩ G-12
2 Engine oil filter Replac e ★✩ G-12
3 Transmission fluid Change ★✩ G-13
4 Hydraulic oil filter (for HST) Replace ★✩ G-13
5 Hydraulic oil filter Replace ★✩ G-13
6 Front axle case oil Change ★✩ G-14
7 Front axle pivot Adjust ✩ G-24
8 Engine start system Check ✩ G-16
9 Greasing – ✩ G-15
10 Wheel bolt torque Check ✩ G-16
11 Battery condition Check ✩ G-21
Air cleaner element
12
[Single type]
Air cleaner
13
element
[Double type]
14 Fuel filter element
15 Fan belt Adjust ✩ G-19
16 Clutch Adjust ★✩ G-14
17 Brake Adjust ✩ G-19
18 Parking brake Adjust ✩ G-20
19 Fuel line
20 Radiator hose and clamp
21 HST oil line
22 Power steering oil line
23 Toe-in Adjust ✩ G-24
24 Engine valve clearanc e Adjust ✩ 1-S21
25 Cooling system Flash ✩ G-26
26 Coolant Change ✩ G-26
27 Fuel system Bleed
28 Fuse Replace G-29
29 Light bulb Replace G-29
Primary
element
Secondary
element
Clean ✩ G-17
Replace ✩ G-17
Clean ✩ *G-17
Replace ✩ ** G-17
Replace ✩ G-17
Clean ✩ G-18
Replace ✩ G-18
Check ✩ G-18
Replace ✩ G-18
Check ✩ G-23
Replace ✩ G-23
Check ✩ G-23
Replace ✩ G-23
Check ✩ G-23
Replace ✩ G-23
50 100 200 400 600 800 2 years
Service Time Interval
Service
as
required
Important
Reference
page
G-28
• The jobs indicated by ★ must be done after the first 50 hours of operation.
• * : Air cleaner should be cleaned more often in dusty conditions than in normal conditions.
• ** : Every year or every 6 times of cleaning.
W1035769
G-10
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
G GENERAL
8. CHECK AND MAINTENANCE
CAUTION
• Be sure to check and service the tractor on a flat place with engine shut off, the parking brake on and chock
the wheels.
[1] DAILY CHECK
To prevent trouble from occurring, it is important to kno w the condition of the tractor. Che ck the following items
before starting.
Checking
• Check areas where previous trouble was experienced.
• Walk around the tractor.
1. Check the tire press ure , and chec k for wear and dam age .
2. Check for oil and water leaks.
3. Check the engine oil lev el.
4. Check the transmi ss ion flui d level.
5. Check the coola nt lev el .
6. Check the condition of seat belt and ROPS attaching hardware.
7. Check and clean the radiator screen and grill.
8. Check the screws and nuts of tires ar e tight .
9. Check the number plate .
10.Care of danger, warning and caution labels.
11.Clean around the exhaust manifold and the muffler of the engine.
• While sitting in the operator’s seat.
1. Check the HST pedal, brake pedals and clutch pedal.
2. Check the parking brake.
3. Check the steering wheel.
• Turning the key switch.
1. Check the performance of the easy checker lights.
2. Check head lights, turn signal lights, hazard lights and other light equipment. Clean if necessary.
3. Check the performance of the meters and gauges.
• Starting the engine.
1. Check to see that the lights on the easy checker go off.
2. Check the color of the exhaust gas.
3. Check the brakes for proper operation.
G-11
STα-30 · STα-35, WSM
■
IMPORTANT■
KiSC issued 11, 2006 A
[2] CHECK POINTS OF INITIAL 50 HOURS
Changing Engine Oil
CAUTION
• Before changing oil, be sure to stop the engine.
• Allow engine to cool down sufficiently, oil can be hot and
can burn.
1. Start and warm up the engine for approx. 5 minutes.
2. Place an oil pan underneath the engine.
3. To drain the used oil, remove the both drain plug (1) at the bottom
of the engine and drain the oil completely.
4. Screw in the both drain plug (1).
5. Fill new oil up to upper line on the dipstick (2).
IMPORTANT
• When using an oil of different manufacture or viscosity from
the previous one, remove all of the old oil.
• Never mix two different types of oil.
• Use the proper SAE Engine Oil according to ambient
temperatures.
• Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page
G-8.)
Engine oil capacity
G GENERAL
4.5 L
1.19 U.S.qts.
0.99 Imp.qts.
(1) Drain Plug
(2) Dipstick
(3) Oil Inlet
A : Oil level is acceptable within this
range.
W1014533
Replacing Engine Oil Filter Cartridge
CAUTION
• Be sure to stop the engine before changing oil filter
cartridge.
• Allow engine to cool down sufficiently, oil can be hot and
can burn.
1. Remove the oil filter cartridge with the filter wrench.
2. Apply a slight coat of oil onto the new cartridge gasket.
3. To install the new cartridge, screw it in by hand. Over tightening
may cause deformation of rubber gasket.
4. After the new cartridge has been replaced, the engine oil
normally decrease a little. Thus see that the engine oil does not
leak through the seal and be sure to read the oil level on the
dipstick. Then, replenish the engine oil up to the specified level.
• To prevent serious damage to the engine, replacement
element must be highly efficient. Use only a KUBOTA
genuine filter or its equivalent.
(1) Engine Oil Filter
W1014892
G-12
STα-30 · STα-35, WSM
■
IMPORTANT■
KiSC issued 11, 2006 A
G GENERAL
Changing Transmission Fluid
CAUTION
• Be sure to stop the engine checking and changing the
transmission fluid.
• Allow engine to cool down sufficiently, oil can be hot and
can burn.
1. Place an oil pan under the tractor.
2. Remove the drain plug (1) at the bottom of the transmission case.
3. Drain the transmission fluid.
4. After draining, screw in the drain plug.
5. Fill new oil from filling port after removing the filling plug (2) up to
the upper notch on the dipstick.
6. After running the engine for a few minutes, stop it and check the
oil level again, if low, add oil prescribed level.
IMPORTANT
• Use only multi-grade transmission oil. Use of other oils may
damage the transmission or hydraulic system.
Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page
G-8.)
• Never work the tractor immediately after changing the
transmission oil. Keeping the engine at medium speed for a
few minutes to prevents damage to the transmission.
• Do not mix different blands oil together.
Transmission fluid capacity
18.5 L
4.89 U.S.gals.
4.07 Imp.gals.
(1) Drain Plug
(2) Filling Plug
(3) Dipstick
A : Oil level is acceptable within this
range.
W1015055
Replacing Hydraulic Oil Filter Cartridge and Transmission Oil
Filter (HST) Cartridge
CAUTION
• Be sure to stop the engine before changing the oil filters.
• Allow engine to cool down sufficiently, oil can be hot and
can burn.
1. Drain the transmission fluid.
2. Remove the both oil filter cartridges by using a filter wrench.
3. Apply a slight coat of oil onto the new cartridge gasket.
4. To install the new cartridge, screw it in by hand. Over tightening
may cause deformation of rubber gasket.
5. After the new cartridge has been replaced, the transmission fluid
level will normally decrease slightly. Make sure that the
transmission fluid does not leak through the seal. Check the fluid
level.
• To prevent serious damage to the hydraulic system. Use
only a genuine KUBOTA filter or its equivalents.
(1) Drain Plug
(2) Hydraulic Oil Filter
(3) Hydraulic Oil Filter (for HST)
W1015586
G-13
STα-30 · STα-35, WSM
■
IMPORTANT■
KiSC issued 11, 2006 A
G GENERAL
Replacing Front Axle Case Oil
CAUTION
• Be sure to stop the engine before changing the front axle
case oil.
• Allow engine to cool down sufficiently, oil can be hot and
can burn.
1. Remove the both right and left dr ain plugs (1) at bottom of the
bevel gear case.
2. Drain the front axle case oil.
3. After draining, screw in the two drain plugs.
4. Fill new oil from filling port with specified amount of oil.
IMPORTANT
• Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil.
Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page
G-8.)
Front axle case oil capacity
(1) Drain Plug (2) Filling Plug
4.0 L
1.06 U.S.gals.
0.88 Imp.gals.
W1015816
Checking Clutch Pedal Free Travel
CAUTION
• When checking, park the tractor on flat ground, apply the
parking brake, stop the engine and remove the key.
1. Slightly depress the clutch pedal (1) and measure free travel “L”
at top of clutch pedal.
2. If the measurement is not within the factory specifications, loosen
the lock nut and adjust the clutch rod (2) length.
• After adjustment, be sure to check that engine does not start
without depressing the clutch pedal but engine start when
depressing the clutch pedal.
Clutch pedal free travel
on top of clutch pedal
“L”
(1) Clutch Pedal (2) Clutch Rod
Factory spec.
20.0 to 30.0 mm
0.78 to 1.18 in.
W1016124
G-14
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
[3] CHECK POINTS OF EVERY 50 HOURS
Greasing
1. Apply a grease to the following position as figures.
(1) Grease Fitting (Top Link)
(2) Grease Fitting (Lifting Rod RH)
(3) Battery Terminal
G GENERAL
(4) Grease Fitting (Brake Pedal Shaft)
(5) Grease Fitting (Clutch Pedal Shaft)
W1016347
G-15
STα-30 · STα-35, WSM
KiSC issued 11, 2006 A
G GENERAL
Checking Engine Start System
CAUTION
• Do not allow anyone near the tractor whil e testing.
• If the tractor does not pass the test do not operate the
tractor.
■ Preparation before testing.
1. Sit on operator’s seat.
2. Set the parking brake and stop the engine.
3. Shift the range gear shift lever in “NEUTRAL” position.
4. Shift the PTO gear shift lever in “NEUTRAL” position.
5. Fully depress the clutch pedal.
■ Test 1 : for safety switch on the clutch pedal
1. Release the clutch pedal.
2. Turn the key to “START” position.
3. The engine must not crank.
■ Test 2 : for safety switch on the speed control pedal
1. Fully depress the clutch pedal again.
2. Depress the pedal to Forward or Reverse.
3. Turn the key to “START” position.
4. The engine must not crank.
■ Test 3 : for safety switch on the PTO gear shift lever.
1. Engage the PTO gear shift lever.
2. Fully depress the clutch pedal again.
3. Turn the key to “START” position.
4. The engine must not crank.
■ After testing : If crank any test of the above, adjust or replace
the required safety switch.
(1) Range Gear Shift Lever
(2) PTO Gear Shift Lever
(3) Clutch Pedal
(4) Speed Control Pedal
W1016474
Checking Wheel Mounting Screws and Nuts Tight ening Torque
CAUTION
• Never operate tractor with a loose rim, wheel, or axle.
• Any time bolts and nuts are loosened, retighten to specified
torque.
• Check all screws and nuts frequently and keep them tight.
1. Check wheel screws and nuts r egularl y especia lly when new. If
there are loosened, tighten as follows.
Front wheel mounting
screws and nuts
Tightening torque
Rear wheel mounting
screws and nuts
(1) Front Wheel Mounting Screw and
Nut
(2) Rear Wheel Mounting Screw and
Nut
77 to 90 N·m
7.9 to 9.2 kgf·m
57.2 to 66.5 ft-lbs
196.1 to 225.6 N·m
20.0 to 23.0 kgf·m
145 to 166 ft-lbs
W1016937
G-16
Loading...