Need the exact part number for your M4050? Coverage runs 195 pages, system by system, with 90 pages of indexed parts lists across engine, drivetrain, hydraulics, electrical, and chassis hardware. Each section pairs factory part numbers with exploded views: 50 pages on engine internals, 40 pages of drivetrain gears and bearing assemblies, and 38 pages on the hydraulic position control system. Factory records put the fuel filter assembly at 0.8 kgf and the air cleaner element at 1.15 kgf, real Kubota figures rather than generic aftermarket data. No more waiting while a dealer thumbs through a binder. Open the PDF, search any part by keyword, jump to a bookmark, and confirm the right number before you order.
What's Inside This Kubota M4050 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Crankcase | 6-7 | Assy Crankcase, Blank Order By, Sealing Cap, Water Pipe, Cylinder Liner, O Ring, Drain Cock, Gasket |
| Cylinder | 8-9 | Engine Hook, Assy Cylinder Head, Blank Order By, Sealing Cap, Valve Inlet Guide, Cylinder Head Gasket, Valve Exhaust Guide |
| Gear Case | 10-11 | Gear Assy Case, Blank Order By, Sealing Cap, Water Pipe, O Ring, Water Return Pipe, Gear Case Gasket, Cap |
| Bearing Case | 12-13 | Gasket, Bearing Assy Case, Blank Order By, Bearing Cover, Cover Gasket, Oil Seal, Main Beari Assy Case |
| Air Cleaner [A][Ca] | 16-17 | Assy Air Cleaner, Air Cleane Assy Body, Blank Order By, Air Cle Assy Element, Air Cleaner Cover, Cleaner Assy Band, Baffle Cover, Assy Indicator |
| Muffler | 18-19 | Muffler Flange, M-flange Gasket, Muffler Band, Muffler Pipe, Pipe Band, Exhaust Manifold, Ex-manifold Gasket |
| Valve | 20-21 | Inlet Valve, Exhaust Valve, Valve Spring, Valve Sp Retainer, spring Collet, Valve Stem Seal, Valve Cap, Rocker Arm Shaft |
| Head Cover | 22-23 | Cylinder Head Cover, Head Cover Gasket, Decomp.hole Cover, Gasket, O Ring, Decompres Assy Shaft, Decompress Shaft, Decomp.shaft Stopper |
| Crankshaft | 26-27 | Piston Standard, Piston + .5MM, Assy Piston Ring Standard, Assy Piston Ring + .5MM, Rod Assy Connecting, Blank Order By, Piston Pin Bush, Crank Pin Set Standard Metal |
| Flywheel | 28-29 | Assy Flywheel, Blank Order By, Ring Gear, Flywhee Assy Housing, Cover, Starter |
| Nozzle Holder | 30-31 | Fuel Over Flow Pipe, Pipe Clip, Cock, Blank Order By, Eye Joint, Gasket, Nozzle Assy Holder, Injection Pipe |
| Governor | 34-35 | Governor Assy Lever, Fork Assy Lever, Blank Order By, Spring, Fork Lever Shaft, Fork Lever Holder, Start Spring, Governor Spring |
| Dynamo | 36-37 | Assy Dynamo, Dynamo Support, Dynamo Stay, Fan, Fan Support, Fan Drive Pulley, V Belt, Crankshaft Damper |
| Radiator | 38-39 | Assy Radiator, Drain Cock, Radiator Net, Water Pipe, Band, Water Flange, Water Flange Packing, Water Return Pipe |
| Name Plate | 40-41 | Label, Instruction Label, Glow Plug Label |
| Injection Pump | 42-43 | Fuel Assy Camshaft, Injection Pump Gear, Governor Sleeve, Governor Ball Case, F-camshaft Stopper |
| Water Pump | 44-45 | Water Assy Pump, Blank Order By, Water Pump Shaft, Water Pump Impeller, Seal Set, Slinger, Fan Pulley, Water Pump Gasket |
| Oil Filter 2 [Section Parts] | 46-47 | Assy Cover, Blank Order By, Relief Assy Valve, O Ring, Assy Cartridge, Cartridge Filter, Oil Filter Label |
| Starter [Section Parts] | 48-49 | Yoke, Armature, Gasket, Brush Holder, Brush Spring, Magnet Switch, Gear, Clutch |
| Nozzle Holder 2 [Section Parts] | 50-51 | Assy Holder Nozzle, Eye Joint, Blank Order By, Nozzle Spring, Distance Piece, Push Rod, Nozzle Piece |
| Dynamo [Section Parts] | 52-53 | Dynamo Pulley, Dynamo Fan, Drive End Frame, Oil Felt, Felt Cover, Retainer Plate, Collar, Spacer |
| Injection Pump [Section Parts] | 54-55 | Adjust Plate, Delivery Valve Spring, Delivery Valve Gasket, Delivery Valve, Pump Element, Gasket, Blank Order By, Control Rack |
| Fuel Tank 1 | 56-57 | Fuel Assy Tank, Blank Order By, Tank Assy Cap, Side Deck Stopper, Fuel Filter, Gasket, Cushion, Union |
| Fuel Tank 2 | 58-59 | Fuel Pipe, Pipe Clip, Cord, Fuel Assy Filter, Cover, Element, Fuel Cock, Blank Order By |
| Accel Rod | 60-61 | Accel Control Rod, Accel Rod End, Bracket, Control Rod Lever, Pedal Control Lever, Accel Control Lever, Accel Shaft, Accel Pedal Shaft |
| Hand Accel | 62-63 | Hand Accel Lever, Lever Grip, Accel Lever Arm, Spring Cap, Lever Spring, Grip, Rod |
| Radiator Support | 64-65 | Element, Cushion, Air Cleaner Support, Air Cleaner Band |
| Clutch Housing | 66-67 | Blank Order By, Bush, Cover, Gasket, Housing Cover, Clutch Assy Housing |
| Change Cover | 68-69 | Speed Change Cover, Gasket, Speed Change Base, Bolt |
| Transmission [A][Ca] | 70-71 | Blank Order By, Gasket, Transmission Cover, O Ring, Oil Gauge, Transmissi Assy Case |
| Front Axle [A][Ca] | 72-73 | Front A Assy Bracket, Blank Order By, Bush, Spring, Grease Nipple, Front Bumper, Collar |
| Clutch | 74-75 | Assy Clutch, Clutch Disk, PTO Clutch Disk, Pressure Plate, Clutch Cover, Lever Kit, Blank Order By, Spring |
| Clutch Pedal | 76-77 | Clutch Assy Pedal, Blank Order By, Bush, Grease Nipple, Clutch Pedal Stopper, Spring, Clutch Rod, Turnbuckle |
| Lever | 78-79 | Blank Order By, Bush, Grip, Lever Assy Guide, Spring, Clutch Control Rod, Control Rod Joint |
| Mission Gear 1 | 80-81 | PTO Assy Shaft, Bearing Retainer, 1ST Shaft, Bush, Spur Gear, Herical Gear, Clutch Bracket, Oil Seal |
| Mission Gear 2 [A][Ca] | 82-83 | Shaft Counter, Spur Gear, Herical Gear, Ring, Needle Bearing, Coupling, Shifter, Spring |
| Mission Gear 3 | 84-85 | Shaft, Spur Gear, Needle Bearing, Thrust Collar, Collar |
| 1,2 Shift Lever [A][Ca] | 86-87 | Shift Lever, Shift Fork, Reverse Shift Fork, Fork, Shift Rod, Shift, Support, Spring |
| Main Change Lever | 88-89 | Grip, Spring, Cap, Spring Cap, Spring Stopper, Shield, Seal |
| Bearing Support Change Lever | 90-91 | Collar, Coupling, Bearing Support, Shift, Spur Gear, Ring, Needle Bearing, Shifter |
| Diff Support | 92-93 | Diff Bearing Support, Taper, roller Bearing, Assy Differential, Differential Case, Diff Side Gear, Differential Pinion, Diff Pinion Shaft |
| Diff Lock | 94-95 | Diff Lo Assy Shifter, Shift Fork, Diff Lock Cam, Spring, Diff Lock Pedal, Oil Seal |
| Bevel Pinion | 96-97 | Bevel Assy Gear, Blank Order By, Collar, Main Bearing, Bearing |
| Axle Case | 98-99 | Axle Case Cover, Gasket, O Ring |
| Rear Axle | 100-101 | Axle, Seal, Assy Gear, Support, Needle Bearing, Thrust Collar, Brake RH Shaft, Brake LH Shaft |
| Front Wheel Hub [A] | 102-103 | Hub Cover, Front Wheel Hub, Stud, Nut |
| Rear Wheel [A] | 104-105 | Stud, Nut |
| Front Axle | 106-107 | Front RH Assy Axle, Blank Order By, Knuckle Shaft Bush, Grease Nipple, Front LH Assy Axle, Front Midd Assy Axle, Bush, Front Shaft Support |
| Knuckle Shaft | 108-109 | Knuckle Shaft R, Knuckle Shaft L, Thrust Collar, Cap, Knuckle Staf Bearing, Knuckle Staff Gasket, Cover |
| Steering | 110-111 | Assy Steering, Gear Assy Box, Bearing, Shaft, Assy Column, Assy Cover, Bush, Oil Seal |
| Power Steering 1 | 114-115 | Tank, Oil Gauge, Tank Band, Pad, Delivery Assy Pipe, O Ring, Assy Pipe, Pipe Band |
| Power Steering 2 | 116-117 | Assy Piston, Assy Pipe, Link Assy Rod, Bracket, Drag Assy Link, Blank Order By, Tie Assy Rod |
| Booster | 118-119 | Assy Cylinder, Assy Valve, Piston Ring, Shifter Housing, Spring, Assy Piston And Rod, Spring Seat, Sleeve |
| Brake | 120-121 | Brake Case, Plate, Blank Order By, Spring, Gasket, Brake Cam Lever, Brake Cam Shaft, O Ring |
| Brake Pedal | 122-123 | Brake RH Assy Pedal, Bush, Grease Nipple, Brake LH Assy Pedal, Brake Pedal Shaft, Pedal Shaft Support, Pedal Shaft Collar, Spring |
| Hand Brake | 124-125 | Hand Brak Assy Lever, Hand Brake Rod, Bolt, Washer |
| Electrical [A][Ca] | 126-127 | Regulator, Fuse Assy Case, Blank Order By, Fuse, Hazard Flasher Unit, Flasher Unit Bracket, Rectifier |
| Battery | 128-129 | Battery Support, Joint, Stay, Battery Cover, Cushion, Case, Pipe |
| Main Switch [A][Ca] | 130-131 | Main Switch, Gasket, Oil Switch, Safety Starte Switch, Starter Switch, Glow Lamp, Switch, Tank Unit |
| Panel Board | 132-133 | Panel, Tractor Meter, Cord, Lamp, Lamp Valve, Flasher Indicator, Valve, Lens |
| Lamp [A][Ca] | 134-135 | Head Assy Lamp, Lamp Bulb, Lens, Body, Spring, Gasket, Tail Lamp, Blank Order By |
| Wire Harness [A][Ca] | 136-137 | Assy Wire Harness, Cord, Wire Harness Hazard, Cord Band |
| PTO Shaft | 138-139 | Gear, Collar, Oil Seal, PTO Bearing Support |
| Shift Fork | 140-141 | Stopper Spring, O Ring, Lever Stopper, Lever Grip, Coupling, Collar, PTO Shift Fork, Shift Lever |
| PTO Cover | 142-143 | PTO Shaft Cover, Bolt, Washer |
| Position Operate 1 | 144-145 | Shaft, O Ring, Bracket, Position Connecter, Stopper, Roller, Connecter, Position Balancer |
| Position Operate 2 | 146-147 | Cam, Retainer, Bracket, Spring, Link |
| Position Operate 3 | 148-149 | Bush, Cam, O Ring, Lever, Rod Bracket, Rod |
| Position Operate 4 | 150-151 | Guide, Lever, Spring, Plate, Lever Stopper, Lever Grip |
| Position Operate 5 | 152-153 | Cover, Gasket, Lever, Joint, O Ring, Rod, Bracket |
| Top Link | 154-155 | Top Link Bracket, Top Link Brack Shaft, Spring, Spring Retainer, Bracket |
| Oil Pump | 158-159 | Oil Pressure Pump, Oil Pump Holder, Gasket, Ring, O Ring, Collar, Gear |
| Control Valve 1 [A][Ca] | 160-161 | Control Assy Valve, Ring, O Ring, Relief Assy Valve, Lever, Grip, Safety Assy Valve |
| Control Valve 2 | 162-163 | Pipe, Assy Coupler, Female Assy Coupler, Male Assy Coupler, Stay, Smv Stay |
| Oil Pump Cylinder Liner | 164-165 | Assy Liner O/p Cylin, Liner O/p Cylinder, O Ring, Back Up Ring, Oil Pres Assy Piston, Oil Pressure Piston, Seat, Pipe |
| Filter Case | 166-167 | Oil Pres Filter, Filter, Filter Gasket, Filter Case Cover, Spring, O Ring, Pipe |
| Oil Pump Arm Shaft | 168-169 | O/p Arm Shaft, Oil Pressure Arm, O/p Piston Rod, O Ring, Collar RH, Collar LH, Lever |
| Bonnet 1 | 170-171 | Front Assy Cover, Bonnet RH Plate, Bonnet LH Plate, Bonnet Assy Hinge, Bonnet Cover Handle, Bonnet Cover Hook, Cushion |
| Bonnet 2 | 172-173 | Bonnet, Head Lamp RH Cover, Head Lamp LH Cover, Cushion, Bonnet Grille, Front Assy Bonnet, Spring, Spacer |
| Bonnet 3 (Rear) | 174-175 | Rear Assy Cover, Cushion, Rubber Cap, Bonnet Assy Cover, Bonnet Cushion, Bonnet Holder, Bonnet Holde Cushion, Bonnet Holder Spring |
| Fender | 178-179 | Fender RH, Fender LH, Fender RH Bracket, Fender LH Bracket, Pad, Distance Piece, Earth Plate, Cushion |
| Step | 180-181 | Step RH, Step LH, Support Stay, Step RH Bracket, Step LH Bracket |
| Towing Drawbar | 182-183 | Towing Assy Drawbar, Drawbar, Drawbar Frame, Side Plate |
| 3-Point Link 1 | 184-185 | Lower Assy Link, Bush, Chain RH Bracket, Chain LH Bracket, Check Assy Chain, Check Front Chain, Turnbuckle |
| 3-Point Link 2 | 186-187 | Tie RH Assy Rod, Tie Rod Gear RH Case, Grease Nipple, Tie Under RH Rod, Rod Handle Spring, Tie Rod RH Sleeve, Tie Rod RH Handle, Tie Rod RH Pinion |
| 3-Point Link 3 | 188-189 | Top Front Assy Link, Top Rear Assy Link, Top Link Sleeve, Bracket, Spring, Collar |
| Front Axle Middle | 190-191 | Front Axle Kit, Front Midd Assy Axle, Blank Order By, Bush, Collar |
| Name Plate [A][Ca] | 192-194 | Label, Front Mark, Side Mark, Starter Switch Label, Main Switch Label, Hand Accel Label, Engine Stop Label, Oil Label |
| Accessory and Service Parts | 195 | Manual, Instruction, Card, Caution |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ASSY FILTER,FUEL weight | 0.8 kgf | p. 59 |
| FILTER,OIL weight | 0.325 kgf | p. 7 |
| FILTER,CARTRIDGE weight | 0.5 kgf | p. 47 |
| ASSY ELEMENT,AIR CLE weight | 1.15 kgf | p. 17 |
| COMP.FILTER,OIL PRES weight | 0.2 kgf | p. 167 |
| SWITCH,MAGNET weight | 1.29 kgf | p. 49 |
| ASSY DYNAMO weight | 3.68 kgf | p. 37 |
| PLATE,PRESSURE weight | 4.15 kgf | p. 75 |
| COVER,CLUTCH weight | 7.5 kgf | p. 75 |
| Piston Oversize | +0.5MM | p. 27 |
| Crank Pin Metal Undersize | -0.2MM | p. 27 |
| Nozzle Holder Adjusting Washer Thickness | 1.00MM | p. 31 |
Kubota M4050 Common Problems This Manual Covers
Kubota M4050 engine won't turn over or clicks intermittently at the starter solenoid p. 48
Inspect the starter exploded view on page 48 to spot the magnetic switch. Check the part number against your serial number before ordering the 1.29 kgf (2.838 lb) switch assembly, since the yoke and armature components have to match for it to fit.
Manual Section: Starter [Section Parts]Weak three-point hitch response and sluggish lift arm movement when operating heavy rear implements p. 166
Pull up the filter case diagram on page 166 and read off the oil pressure filter part number. The hydraulic filter weighs 0.2 kgf (0.44 lb); confirm that figure before sourcing. While you are there, note the O-rings and backup rings the exploded view calls for, so you replace them in the same job.
Manual Section: Filter CaseTransmission slipping under heavy load or making loud grinding noises when shifting gears p. 74
Open the clutch assembly breakdown on page 74 and find the right pressure plate, listed at 4.15 kgf (9.13 lb) for your drivetrain. Pull the PTO clutch disk and related hardware numbers from the same catalog list so the rebuild goes back together correctly.
Manual Section: ClutchEngine starves for fuel under load or surges randomly during normal operation p. 58
Locate the fuel lines and filter components on page 58, then pin down the part number for the 0.8 kgf (1.76 lb) fuel filter assembly. The diagram also shows the pipe clips and joints; swap any cracked or perished rubber while the system is open.
Manual Section: Fuel Tank 2Low engine compression and excessive crankcase blowby visible from the main breather tube p. 26
Find the crankshaft and piston breakdown on page 26. Cross-check the part number for the +0.5MM oversize piston and its matching ring assembly. The connecting rod and cir-clip numbers sit in the same index; line them up before an overhaul so everything fits on reassembly.
Manual Section: CrankshaftFrequently Asked Questions
What are the replacement specifications for fuel filter?
As a parts catalog, this manual gives part numbers but no replacement specs like torque, procedure, or interval. Fuel Tank 1 lists the FILTER,FUEL as 35450-41350 (REF.No 005); Fuel Tank 2 lists the ASSY FILTER,FUEL as 15601-43010 (REF.No 007).
What are the replacement specifications for oil filter?
Part numbers are listed, but you will not find replacement specs such as torque, procedure, or interval here. The Crankcase FILTER,OIL is 15601-32110 (REF.No 035), and the Oil Filter 2 [Section Parts] FILTER,CARTRIDGE is 15402-32430 (REF.No 006).
How quickly can I access this Kubota M4050 manual after buying?
A 195-page parts catalog in searchable PDF format, yours the moment checkout completes. Open it on a computer, tablet, or phone, with no shipping wait.
Is this Kubota M4050 Parts Catalog printable?
None at all. The PDF is DRM-free, so print whatever sections you want to take to the shop. Standard letter or A4 paper works fine.
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