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, Plug, Expantion, Cap, Sealing |
| Cylinder | 8-9 | Assy Cylinder, Oil Pr, Bush O/P Arm Shaft R, Bush O/P Arm Shaft L, Gasket, Stud, Bolt, Washer |
| Gear Case | 10-11 | Assy Case, Gear, Blank, Plug, Pin, Cap, Sealing, Pipe |
| Bearing Case | 12-13 | Bolt, Knock, Gasket, Assy Case, Bearing, Blank, Washer, Plain |
| Air Cleaner [A][Ca] | 16-17 | Assy Air Cleaner, Assy Body, Air Cleane, Blank, Assy Element, Air Cle, Cover, Assy Band |
| Muffler | 18-19 | Flange, Gasket, M-Flange, Band, Pipe, Manifold, Exhaust |
| Valve | 20-21 | Inlet, Exhaust, Spring, Retainer, Sp., Collet, Seal |
| Head Cover | 22-23 | Cover, Cylinder Head, Gasket, Nut, Washer |
| Crankshaft | 26-27 | Piston, Assy Piston Ring, Piston Pin, Cir-Clip, Assy Connecting, Rod, Blank |
| Flywheel | 28-29 | Assy Flywheel, Blank, Gear, Ring, Bolt, Washer, Assy Housing, Flywhee |
| Nozzle Holder | 30-31 | Pipe, Fuel Over Flow, Clip, Cock, Blank, Joint, Eye |
| Governor | 34-35 | Assy Lever, Fork, Blank, Pin, Spring, Fork 2, Shaft |
| Dynamo | 36-37 | Assy Dynamo, Bolt, Nut, Washer, Spring, Plain, Support |
| Radiator | 38-39 | Assy Radiator, Cock, Drain, Net, Pipe, Water, Band, Flange |
| Name Plate | 40-41 | Label, Instruction, Glow Plug |
| Injection Pump | 42-43 | Pump, Injection, Shim, Stud, Nut, Washer, Spring, Assy Camshaft |
| Water Pump | 44-45 | Assy Pump, Water, Blank, Shaft, Impeller, Set, Seal, Bearing |
| Oil Filter 2 [Section Parts] | 46-47 | Assy Cover, Blank, Assy Valve, Relief, O Ring, Assy Cartridge, Filter, Cartridge |
| Starter [Section Parts] | 48-49 | Yoke, Armature, Gasket, Holder, Brush, Spring, Switch |
| Nozzle Holder 2 [Section Parts] | 50-51 | Assy Holder Nozzle, Nut, Joint, Eye, Washer, Plain, Blank |
| Dynamo [Section Parts] | 52-53 | Nut, Washer, Spring, Pulley, Fan, Frame, Drive End, Felt |
| Injection Pump [Section Parts] | 54-55 | Plate, Adjust, Bolt, Spring, Deliv.Valve, Gasket, Delivery |
| Fuel Tank 1 | 56-57 | Assy Tank, Fuel, Blank, Assy Cap, Tank, Stopper, Side Deck, Filter |
| Fuel Tank 2 | 58-59 | Pipe, Fuel 1, Fuel 2, Fuel 3, Clip |
| Accel Rod | 60-61 | Rod, Accel Control 1, End, Nut, Washer, Plain, Pin, Split |
| Hand Accel | 62-63 | Grip, Arm, Accel Lever, Pin, Spring, Washer, Cap |
| Radiator Support | 64-65 | Support, Bolt, Washer, Spring, Element, 1, 2 |
| Clutch Housing | 66-67 | Blank, Bush, Pin, Straight, Bolt, Washer, Spring, Cover |
| Change Cover | 68-69 | Cover, Speed Change, Gasket, Bolt, Washer, Spring, Base |
| Transmission [A][Ca] | 70-71 | Blank, Pin, Straight, Gasket, Bolt, Washer, Spring, Cover |
| Front Axle [A][Ca] | 72-73 | Assy Bracket, Front a, Blank, Bush, Stud, Spring |
| Clutch | 74-75 | Assy Clutch, Disk, P.T.O Clutch, Plate, Pressure, Cover, Kit |
| Clutch Pedal | 76-77 | Assy Pedal, Bush, Nipple, Grease, Stopper, Bolt, Washer, Spring |
| Lever | 78-79 | Bush, Bolt, Washer, Spring, Grip, Assy Guide, Pin |
| Mission Gear 1 | 80-81 | Assy Shaft, Pto, Shaft, Cir-Clip, External, Bearing, Ball |
| Mission Gear 2 [A][Ca] | 82-83 | Counter, Shaft, Gear, Spur 44, Spur 40, Spur 33 |
| Mission Gear 3 | 84-85 | Shaft, Gear, Spur 26, Bearing, Needle, Collar, Thrust |
| 1,2 Shift Lever [A][Ca] | 86-87 | Shift 1.2, Shift 3.4, Fork, Shift 1.2.3.4, Pin, Set, Reverse Shift |
| Main Change Lever | 88-89 | Main Change, Grip, Spring, Cap, Stopper |
| Bearing Support Change Lever | 90-91 | Collar, Coupling, Support, Bearing, Shift, Gear, Spur 43, Ring |
| Diff Support | 92-93 | Support, Diff Bearing, Shim, Bolt, Washer, Spring, Bearing, Taper |
| Diff Lock | 94-95 | Assy Shifter, Diff Lo, Fork, Shift, Cam, Spring, Pedal, Shim |
| Bevel Pinion | 96-97 | Assy Gear, Bevel, Collar, Bearing, Main 1, Nut |
| Axle Case | 98-99 | Case, Axle, Cover, Gasket, Bolt, Washer, Spring, O Ring |
| Rear Axle | 100-101 | Axle, Seal, Bearing, Ball, Nut, Washer, Cir-Clip, External |
| Front Wheel Hub [A] | 102-103 | Cover, Hub, Front Wheel, Stud, Nut |
| Rear Wheel [A] | 104-105 | Stud, Nut |
| Front Axle | 106-107 | Assy Axle, Front Rh, Bush, Pin, Knock, Nipple, Grease |
| Knuckle Shaft | 108-109 | Comp.Knuckle Shaft R, Pin, Knock, Comp.Knuckle Shaft L, Washer, Collar, Thrust, Cap |
| Steering | 110-111 | Assy Steering, Assy Box, Gear, Assy Nut, Ball, Bearing, Shaft, Assy Column |
| Power Steering 1 | 114-115 | Tank, Gauge, Oil, Washer, Seal, Band, Pad |
| Power Steering 2 | 116-117 | Assy Piston, Assy Pipe 2, Washer, Assy Rod, Link, Nut, Slotted, Pin |
| Booster | 118-119 | Assy Cylinder, Assy Valve, Piston Ring, Housing, Shifter, Plug, Spring, Assy Piston And Rod |
| Brake | 120-121 | Case, Plate, Stud, Nut, Washer, Spring, Pin |
| Brake Pedal | 122-123 | Assy Pedal, Brake Rh, Bush, Nipple, Grease, Brake Lh, Bolt |
| Hand Brake | 124-125 | Assy Lever, Hand Brak, Bolt, Washer, Spring, Rod, Plain |
| Electrical [A][Ca] | 126-127 | Regulator, Screw, Pan Head, Washer, Assy Case, Fuse, Unit |
| Battery | 128-129 | Support, Joint, Bolt, Washer, Spring, Plain, Stay |
| Main Switch [A][Ca] | 130-131 | Switch, Key, Main, Gasket, Oil |
| Panel Board | 132-133 | Panel, Meter, Tractor, Cord, Lamp, Indicator, Flasher |
| Lamp [A][Ca] | 134-135 | Assy Lamp, Head, Bulb, Lens, Body, Washer, Plain, Spring |
| Wire Harness [A][Ca] | 136-137 | Assy Wire Harness, Cord, Hazard, Nut, Washer, Spring, Clamp |
| PTO Shaft | 138-139 | Shaft, Pto, Gear 16, Gear 65, Collar, Nut, Bearing, Ball |
| Shift Fork | 140-141 | Spring, Stopper, Ball, Plug, O Ring, Bolt, Washer |
| PTO Cover | 142-143 | Cover, Pto, Bolt, Washer, Spring, Plain |
| Position Operate 1 | 144-145 | Shaft, O Ring, Cir-Clip, External, Key, Bracket, Bolt, Washer |
| Position Operate 2 | 146-147 | Cam, Bolt, Washer, Spring, Retainer, Pin |
| Position Operate 3 | 148-149 | Bush, Cam, O Ring, Cir-Clip, External, Pin, Spring, Bolt |
| Position Operate 4 | 150-151 | Guide, Bolt, Nut, Washer, Spring, Plate |
| Position Operate 5 | 152-153 | Cover, Gasket, Joint, O Ring, Pin, Spring, Stud, Nut |
| Top Link | 154-155 | Bracket, Shaft, Brack, Bolt, Set, Spring, Retainer, Spring 1 |
| Oil Pump | 158-159 | Pump, Oil Pressure, Stud, Bolt, Nut, Washer, Spring, Holder |
| Control Valve 1 [A][Ca] | 160-161 | Assy Valve, Control, Ring, O Ring, Bolt, Washer, Spring |
| Control Valve 2 | 162-163 | Pipe 1, Pipe 2, Assy Coupler, Female, Male, Stay |
| Oil Pump Cylinder Liner | 164-165 | Assy Liner O/P Cylin, Liner O/P Cylinder, Plug, O Ring, Ring, Back Up, Assy Piston, Oil Pres |
| Filter Case | 166-167 | Comp.Case, Filter, Bolt, Washer, Spring, Comp.Filter, Oil Pres |
| Oil Pump Arm Shaft | 168-169 | Shaft, O/P Arm, Arm, Oil Pressure, Rod, O/P Piston, Collar Rh, Collar Lh |
| Bonnet 1 | 170-171 | Assy Cover, Front, Comp.Plate, Bonnet Rh, Assy Hinge, Bonnet, Handle, Bonnet Cover |
| Bonnet 2 | 172-173 | Comp.Bonnet, Cover, Head Lamp Rh, Grille, Bonnet, Pin, Assy Cover |
| Bonnet 3 (Rear) | 174-175 | Assy Cover, Rear, Cap, Rubber, Bonnet, Holder |
| Fender | 178-179 | Bracket, Balustrade, Cushion |
| Step | 180-181 | Stay, Support, Bracket |
| Towing Drawbar | 182-183 | Assy Drawbar, Towing, Drawbar, Frame, Plate, Side, Pin |
| 3-Point Link 1 | 184-185 | Assy Link, Lower, Bush, Bracket, Chain Rh, Assy Chain, Check, Pin |
| 3-Point Link 2 | 186-187 | Assy Rod, Tie Rh, Case, Tie Rod Gear Rh, Nipple, Grease, Rod, Tie Under Rh |
| 3-Point Link 3 | 188-189 | Assy Link, Top Front, Pin, Spring, Top Rear, Comp.Sleeve, Top Link |
| Front Axle Middle | 190-191 | Assy Axle, Front Rh, Bush, Pin, Knock, Nipple, Grease |
| Name Plate [A][Ca] | 192-194 | Label, Instruction, Glow Plug |
| 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.
Document Quality
This document is a scanned PDF, not a native digital file, which is explicitly stated on the first page to deter reproduction. An OCR layer is present, so you can search and copy text throughout the manual. The text quality is crisp and easy to read on all pages, despite some slight tilting on certain scans. Diagrams and illustrations are raster images, meaning they may pixelate when highly magnified, but all labels remain clearly readable. Overall, the pages are clean with no significant scan artifacts or stains.
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