Kubota W5021-SC - User Manual

CONTENTS
SPECIFICATIONS----------1
DIMENSIONS 13
M. MECHANISM
1.ENGINE------------ M-1
2. TRANSMISSION
[1] AUTOMATIC PRESSURE
(EXCEPT -P, -PC, -PCC) M-5
RELIEVING MECHANISM ....................... M-l [1] POWER TRAIN ...................................... M·5
[2]
CARBURETOR ........................................ M-3
3. MOWER
BLADE CLUTCH
[3]
SUB PTO SHAFT
(EXCEPT .p, .T) --------- M-9
(Except
-P, -PC, -PCC) ·· ..........······ .. ···· .... ·M-3
G. GENERAL DISASSEMB~: NG ::~~~:~::~::::::i::CE)um.muu.u.~·:! '= S.
[1] IDENTIFICATION ······································5-1
,[2]
GENERAL SAFETy··································· 5-1
[3] GENERAL PRECAUTION .......................... 5-3 [3] FUEl SYSTEM ........................................ 5-91
[4] LUBRICANTS AND FUEL.······ ...... ·············S-3
[5]
TROUBLESHOOTING ································S-5
[6]
SERVICING SPECIFICATIONS··················S-ll
[7] TIGHTENING
TORQUES ......................... S-24
(1) Tightening Torques for Important (1) Carburetor ........................................ S-93
S-95
Screws, Bolts and Nuts ...................... S-24 [4] IGNITION SYSTEM ................................
(2)
Tightening Torques for General
Use Screws, Bolts and Nuts ................ S-24 (1) Spark PI ug ......................................... 5-95
[8] MAINTENANCE
CHECK LIST ................. S-27 (2) Ignition Unit ..................................... S-95
[9] CHECK AND MAINTENANCE ................ S-29 (3) Stop Switch ....................................... S-97
(1) Check Points of Each Use
or Daily·· .. ·.···· .. ······............................ S-29 CHECKING .. ···........· ...... · .. ···....· .... ··· .. · .. · .... S-99
(2) Check Points of First Month
or Initial 20 Hours ............................. S-33
(3) Check Points of Every 3 Months [6] CHARGING SYSTEM ····· .. · ...... ··· .. ··· .. · .... S-103
or 50 Hours ........................................ S-35
(4) Check Points of Every 6 Months
or 100 Hours ...................................... S-35 DISASSEMBLING AND ASSEMBLING .. · .. S-105
(5) Check Points of Every Year SERVICING ... ············ ...... ··· .... ············ ...... S-105
or 300 Hours ...................................... S-41
[10]
SPECIAL TOOLS ·· ...... ···· ...... ·· .. ·········· .... ·5-43 (EXCEPT -P, -PC, -PCC) S-111
1.
DISASSEMBLING AND ASSEMBLING .... ···S-47 [2] TRANSMISSION ................................... S-113
[2] ENGINE BODY ·.·· ...... ··· .... ·· .. ······· ....···.... ·S-51
CHECKING AND ADJUSTING ····.......... ·· .. ·S-51 SERVICING ............................................. S-115
DISASSEMBLING AND ASSEMBLING ....· .. S-51
(1) External Components ....................... S-51
(2) Cylinder Head and Valves ................. S-59 SERVICING ............................................. S-125
(3) Camshaft, Piston and Crankshaft ...... S-61
SERVICING ............................................... S-71
(1) Valves··· .... · .... ···........ ·· ..........· .... · .. · .... S-71
(2) Cylinder liner .................................... S-77
(4) Connecting Rod, Crankshaft and .:.
Camshaft···········································5-83 ~
CHECKING AND ADJUSTING ···················S-91 .:.
(1) Governor ........................................... S-91 ~
(2) ChokeRod· ............ ··········· ... ···· ...... ··.·S·91
DISASSEMBLING AND ASSEMBLING ·······S-93
CHECKING AND ADJUSTING ···················5-95
[5]
STARTING SYSTEM ········ .. ······················S-99
DISASSEMBLING AND ASSEMBLING ·· .. ·S-101
SERVICING ............................................. S-l 01
CHECKING ...... · .................. · .. · .. ·· .. · .......... S-l 03
2. MOWER BLADE CLUTCH AND BLADE - S-105
3. TRANSMISSION
ENGINE S-47
[1] SEPARATING ENGINE ·······........ · .... · .. ·· .. ·5-47
[1] SEPARATING TRANSMISSION ....····...... S-lll
DISASSEMBLING AND ASSEMBLING ·.... S-111
DISASSEMBLING AND ASSEMBLING .... ·S-l13
4.
FRONT WHEEL AND REAR WHEEL--S-121
DISASSEMBLING AND ASSEIVIBLING ·· .. ·S-121
5. HANDLE AND DISCHARGE GUARD --S-129
CHECKING AND ADJUSTING .......... ·· .. ···S-129
DISASSEMBLING AND ASSEMBLING .... ·S-129

Summary

ENGINE

Automatic Pressure Relieving Mechanism

Explains the automatic pressure relieving mechanism for engine starting.

Carburetor

Details the carburetor's function and checks, including fuel level.

TRANSMISSION

Power Train

Explains the transmission's gear train for speed and operation.

MOWER BLADE CLUTCH (EXCEPT -P, -T)

WIRING DIAGRAM (-SCE,-TCE)

GENERAL

General Precaution

Outlines precautions for operating and servicing the engine safely.

Servicing Specifications Engine Body

Provides detailed factory specifications and allowable limits for engine body components.

Ignition System

Lists specifications for spark plug, ignition unit, and coil tests.

Transmission (-SCC, -HTC)

Tightening Torques for Important Screws, Bolts and Nuts

Lists torque specifications for critical engine and blade/handle fasteners.

Maintenance Check List

Lists inspection points based on service intervals (daily, monthly, yearly).

Check and Maintenance

Routine checks for fuel and oil levels.

Checking Mower Blade

Guides on checking, sharpening, and replacing the mower blade.

Cleaning and Readjusting Spark Plug

Adjusting Throttle Lever

Details how to adjust the throttle lever for high/low speed and choke operation.

Adjusting Mower Blade Clutch Lever (Except -P, -T)

General Safety

Lists essential safety precautions before servicing the mower.

Lubricants and Fuel

Specifies engine oil, transmission oil, and fuel requirements with capacities.

Checking Fuel Level

Details steps to check the fuel level and important refueling precautions.

Retightening Blade Mounting Screw

Changing Engine Oil

Step-by-step instructions for changing the engine oil.

Adjusting Drive Clutch Lever (Except -P, -PC, -PCC)

Checking Engine Oil level

Mower Blade Clutch and Blade

Details specifications for blade end play, clearance, and clutch spring length.

Transmission (EXCEPT -P, -PC, -PCC)

TROUBLESHOOTING

Engine Will Not Crank

Lists symptoms, causes, and solutions for an engine that will not crank.

Engine Cranks Slowly but Does Not Start

Details symptoms, causes, and solutions for slow engine cranking.

Engine Cranks at Normal Speed but Does Not Start

Outlines symptoms, causes, and solutions when the engine cranks but won't start.

ENGINE (S.1)

Separating Engine Disassembling and Assembling

General steps for disassembling and assembling the engine.

Engine Body Checking and Adjusting

Guides on checking and adjusting engine valve clearance.

Fuel System Checking and Adjusting

Guides on adjusting the governor and choke rod.

Ignition System Checking and Adjusting

Guides on checking spark plug, ignition unit, and coil tests.

Valves

Instructions for removing and installing valves, including reassembly notes.

Connecting Rod Cap

Piston and Connecting Rod

Details piston insertion, ring gap staggering, and connecting rod alignment.

Piston Ring and Piston Pin

Servicing (1) Valves

Instructions for servicing valves.

(2) Cylinder Liner

Instructions for measuring cylinder liner ID and checking for wear.

Connecting Rod, Crankshaft and Camshaft

Oil Clearance between Crank Pin and Connecting Rod Big End

Carburetor and Governor lever

Starter Test

Draining Engine Oil

Valve Clearance

Details how to check and adjust valve clearance, including critical notes.

Governor

Guides on adjusting the governor and maximum no-load speed.

Spark Plug

Guides on checking spark plug gap and performing a spark test.

Cylinder Head and Valves

Covers removing cylinder head cover, rocker arms, and push rods.

Camshaft and Tappet

Guides on removing and installing the camshaft and tappets.

Crankshaft and Governor Lever Shaft

Clearance between Valve Stem and Valve Guide

Details measuring and adjusting valve stem to guide clearance.

Cylinder Liner I.D.

Details measuring cylinder liner ID and checking for wear.

Piston Skirt O.D.

Covers measuring piston skirt OD and checking for wear.

Clearance between Piston Ring and Ring Groove

Starter

Piston Ring Gap

STARTING SYSTEM CHECKING

Starting Switch

Guides on checking the starting switch resistance in different positions.

Starter Relay

MOWER BLADE CLUTCH AND BLADE

Cutting Height

Drive Disk and Actuator A, B

Blade End Play

TRANSMISSION (EXCEPT -P, -PC, -PCC) (S.3)

Separating Transmission Disassembling and Assembling

TRANSMISSION (S.3)

Disassembling and Assembling

Counter Shaft, Final Shaft, Bevel Pinion and Clutch fork

Clutch Arm and Transmission Case

Kubota W5021-SC Specifications

General

Brand	Kubota
Model	W5021-SC
Category	Lawn Mower
Language	English