Need the exact part number for your Kubota L4400H? The factory parts catalog maps every component across 312 pages, from the crankcase and injection pump through the HST drivetrain, rear differential, and 3-point hydraulic linkage. You'll work from 309 pages of parts lists, each paired with an exploded-view diagram, covering everything from crankcase internals to optional auxiliary control valve kits. Switches, sensors, relays, and wiring harness components are all called out by catalog number, and 15 pages of hydraulic parts cover pump internals, steering cylinder seal kits, and PTO oil line pieces. Replacing a piston? The +0.25mm oversize and -0.40mm/SET undersize crankpin bearing are both listed, so you order the right grade on the first call. No more digging through binders at the parts counter. Bookmarks let you jump to any assembly in seconds and carry the whole catalog to the machine on your phone.
What's Inside This Kubota L4400H Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Crankcase | 3-4 | Cap Sealing, Gasket, Assy Pump Oil, Gear Oil Pump Drive |
| Oil Pan | 5-6 | Filter Oil, O Ring, Guide Oil Gauge |
| Cylinder Head | 7-8 | Hook Engine, Cap Protector, Cap Sealing, Guide Inlet Valve, Seat Inlet Valve, Seat Exhaust Valve |
| Gear Case | 9-11 | O Ring, Cover, Spring, Seat Valve, Flange Water Return, Assy Gear Case H/m |
| Head Cover | 12-13 | Pipe Water Return, O Ring, Washer, Clamp |
| Main Bearing Case | 14-15 | Seal Oil, Bolt |
| Camshaft and Idle Gear Shaft | 16-17 | Tappet, Push Rod, Stopper Camshaft, Ball |
| Piston and Crankshaft | 18-20 | Assy Connecting Rod, Metal Crankpin - .40MM/SET, Metal Crankpin Std/set, Bush Crankshaft, Slinger Oil, Collar Crankshaft, O Ring, Seal Oil |
| Flywheel | 21-22 | Cover, Packing Cover, Bolt, Pin |
| Fuel Camshaft | 23-24 | Assy Camshaft Fuel, Gear Injection Pump, Sleeve Governor, Stopper Fuel C/shaft |
| Engine Stop Lever | 25-26 | O Ring, Gasket, Seal Oil, Pin |
| Injection Pump | 27-28 | Joint Eye, Gasket, Assy Cock Jet Start, Assy Pump Fuel, Assy Tube Fuel, Clip Pipe |
| Governor | 29-30 | Holder Fork Lever, Bolt, Washer |
| Speed Control Plate | 31-32 | Gasket, Pipe Lock, Seal Oil, Nut |
| Nozzle Holder and Glow Plug | 33-34 | Assy Pipe Over Flow, Kit Holder Nozzle, Gasket, Seal Heat, Pipe Injection, Clip Pipe |
| Nozzle Holder [Component Parts] | 35-37 | Kit Holder Nozzle, Spring Nozzle, Piece Distance, Push Rod, Piece Nozzle, Assy Washer Adjust, Gasket, Seal Heat |
| Water Flange and Thermostat | 38-39 | Gasket, Cover Thermostat, Gasket Thermostat, Plug |
| Water Pump | 40-41 | Body Water Pump, Bearing, Assy Seal Mechanical, Bolt |
| Valve and Rocker Arm | 42-43 | Spring Valve, Retainer Valve Sp, Collet Valve Spring Set, Seal Valve Stem, Cap Valve, Bracket Rocker Arm, Spring Rocker Arm, Assy Rocker Arm |
| Inlet Manifold | 44 | Figure Num 010601 |
| Exhaust Manifold/Muffler | 45-46 | Gasket Muffler, Stud, Nut, Bolt |
| Air Cleaner | 47-48 | Band Pipe, Fastener, Washer, Bolt |
| Upper Gasket Kit | 49-50 | Seal Valve Stem, Gasket, Seal Heat, Gasket Thermostat, Gasket Muffler |
| Lower Gasket Kit | 51-52 | Gasket, O Ring Out Of Use, Seal Oil, O Ring |
| Accelerator Lever | 53-54 | Spring Accel.lever, Nut, Washer, Pin |
| Fuel Tank | 55-56 | Assy Cap Fuel Tank, Gasket, Sponge, Plate Fuel Tank |
| Fuel Pipe and Fuel Filter | 57-58 | Assy Tube Fuel, Tube Pipe, Clip Pipe, Pipe Fuel, Band Cord |
| Fuel Filter [Component Parts] | 59-60 | O Ring, Screw |
| Fan | 61 | Pulley Fan, V Belt, Bolt |
| Water Pipe | 62 | Figure Num 01A410 |
| Radiator | 63-64 | Cap Radiator, O Ring, Sponge, Rubber |
| Reserve Tank | 65-66 | Assy Tank Reserve, Assy Cap, Gasket, Clip Pipe, Stay Reserve Tank, Band Cord |
| Alternator | 67-68 | Assy Alternator, Key, Bolt, Washer |
| Alternator [Component Parts] | 69-70 | Assy Alternator, Pulley Alternator, Collar, Assy Frame Drive End, Plate Retainer, Rotor, Cover Bearing, Frame End |
| Starter | 71 | Assy Starter, Stud, Nut, Bolt |
| Starter [Component Parts] | 72-73 | Assy Starter, Assy Yoke, Assy Armature, Bearing, Roller, Retainer, Gear, Frame End |
| Battery | 74-75 | Battery 80D26R, Cord Earth, Cushion, Retainer Battery |
| Switch 1/Relay | 76-77 | Relay Starter, Harness Main Switch, Switch Combination, Assy Body Switch, Lever Flasher, Knob Light, Relay Glow, Assy Key Main Switch |
| Switch 2/Sensor | 78-79 | Sensor Water Temp, Switch Lever, Band Cord, Washer |
| Panel Board | 80-81 | O Ring, Grommet, Clamp, Screw |
| Panel Board [Component Parts] | 82-83 | Assy Panel, Comp.Meter, Assy Case, Assy Bulb, Glass, Cover |
| Head Light | 84-85 | Assy Light Head, Bulb 25W, Assy Wire Harness, Bolt |
| Hazard Light | 86 | Figure Num 01B311 |
| Rear Lamp | 87-88 | Assy Light Combi.rh, Lens, Gasket, Bulb 23W, Assy Light Combi.lh, Holder |
| Electrical Wiring (Front) | 89-90 | Case Fuse Box, Puller Fuse, Fuse 5A, Clip, Band Cord |
| Electrical Wiring (Rear) | 91-92 | Clip, Bolt |
| Clutch | 93 | Figure Num 01C101 |
| Clutch Lever | 94-95 | Lever Clutch, Holder Clutch, Bearing Release, Pin Snap, Fork Clutch Release, Key Fork |
| Clutch Pedal | 96-97 | Cover Pedal, U Joint, Nut, Pin |
| Clutch Housing | 98-99 | Bush, Plug, Washer, Pin |
| HST (Hi-Lo and Solenoid Valve) [Component Parts] | 104-105 | O Ring, Plug |
| HST (Relief Valve) [Component Parts] | 106-107 | O Ring, Plug |
| HST (Cylinder Block) [Component Parts] | 108-109 | Spring, Holder Spring, Circlip, Screw |
| HST (Charge Pump) [Component Parts] | 110-111 | Spring L, O Ring, Circlip, Pin |
| HST (Input Shaft) [Component Parts] | 112-113 | Ball, Pin, Bolt |
| Mid Case | 114-115 | Seal Piston, O Ring, Pin, Bolt |
| Transmission Case | 116-117 | Pin, Stud, Bolt, Washer |
| Countershaft | 118 | Coupling, Ball |
| Range Gear Shaft | 119-120 | Gear-Shaft, Coupling, Bearing Ball, Collar |
| Spiral Bevel Pinion | 121-122 | Case, Bearing Taper-roller, Cover Bearing, Collar Thrust, Bearing Needle, Bearing Roller |
| Rear Differential | 123-125 | Shaft Diff.pinion, Pinion Diff. 12T, Gear Diff.side RH 20T, Gear Diff.side LH 20T, Shifter Diff.lock, Bearing Taper-roller, Support Diff |
| PTO Countershaft | 126 | Ball |
| PTO Clutch | 127-128 | Seal Ring, Collar Distance, Ball, Circlip |
| PTO Clutch [Component Parts] | 129-130 | D Ring Outer, D Ring Inner, O Ring, Disk Clutch |
| PTO Drive Shaft | 131-132 | Collar Thrust, Bearing Needle, Ball, Circlip |
| PTO Shaft | 133-134 | Collar Oil Seal, Seal Oil, Slinger, O Ring, Cap |
| Range Gear Shift Fork | 135-136 | Spring, O Ring, Stopper, Pin |
| Differential Lock Shift Fork | 137-138 | Fork Diff.lock Shift, Seal Oil, Spring, Pin |
| Cruise Control Lever | 139-140 | Bush, Rod Shift, Turnbuckle, Bolt |
| Cruise Control Cable | 141-142 | Bush, Bolt, Nut, Pin |
| Neutral Holder Link | 143-144 | Bush, Spring, Damper HST, End Rod |
| Speed Control Pedal | 145-146 | End Rod, Seal Oil, Bolt, Nut |
| Range Gear Shift Lever | 147-148 | Bush, Bolt, Circlip, Washer |
| PTO Clutch Control Lever | 149-150 | Pipe Hydraulic, Bush, Grip PTO Lever, Bolt |
| PTO Clutch Valve [Component Parts] | 151-152 | O Ring, Ring, Collar Thrust, Seal Oil |
| Front Wheel Drive Lever | 153-154 | O Ring, Stopper, Bolt, Pin |
| Rear Axle Lh | 155-156 | Axle Rear, Spacer, Seal Oil, Gear 60T |
| Rear Axle Rh | 157-158 | Axle Rear, Spacer, Seal Oil, Gear 60T |
| Brake Lh | 159-160 | Cam Brake LH, O Ring, Plate Brake Cam LH, Plate, Lever Brake Cam LH |
| Brake Rh | 161-162 | Cam Brake RH, O Ring, Plate Brake Cam RH, Plate, Lever Brake Cam RH |
| Brake Rod 1 (Brake Pedal) | 163-164 | Bush, Shaft Brake LH, Shaft Brake RH, Rod Brake Lower, Turnbuckle |
| Brake Rod 2 (Brake Cam) | 165 | Rod Brake, Pin Joint, Washer Plain, Pin Split |
| Brake Pedal | 166-167 | Cover Pedal, Circlip, Washer, Nut |
| Front Axle Frame | 168-169 | Bolt, Plug |
| Propeller Shaft | 170-171 | Coupling, Seal Oil, Sleeve, Circlip |
| Front Wheel Drive Shaft | 172 | Spring, Ball |
| Front Differential Case | 173-174 | Gasket, O Ring, Pipe Breather, Tube Fuel, Nipple Grease, Collar Thrust, Band Cord |
| Bevel Gear (Front) | 175-176 | Bearing Taper-roller, Collar .2MM, Seal Oil, Nut |
| Differential (Front) | 177-178 | Case Diff, Shaft Pinion, Pinion Diff. 12T, Collar Pinion Thrust, Gear Diff.side 24T |
| Front Axle Case Lh | 179-180 | Plug, Washer, Circlip, Ball |
| Front Axle Case Rh | 181-182 | Plug, Washer, Circlip, Ball |
| Differential Gear Shaft | 183-184 | Shaft Yoke LH RH, Shaft Yoke RH LH, O Ring, Pin |
| Front Axle | 185-186 | Axle Front, Collar, Seal Oil, O Ring |
| Steering Handle | 187-188 | Seal Oil, O Ring, Circlip, Pin |
| Steering Controller | 189-190 | O Ring, Nut, Washer |
| Steering Support | 191-192 | Bush, Bearing Needle, Seal Oil, Pin |
| Tie Rod/Steering Cylinder | 193-194 | Clip, Cover Dust, Joint Tie Rod, Ring Set |
| Steering Cylinder [Component Parts] | 195-196 | Cylinder Hydraulic, Seal Piston, Assy End Rod, Bush, Seal Rod, Kit Seal |
| Hydraulic Pump | 197-198 | Holder Pump, O Ring, Gear Pump Drive 17T, Assy Pump Hydraulic |
| Hydraulic Pump [Component Parts] | 199-200 | Assy Pump Hydraulic, Bush, Gear Hydraulic Pump, Seal Oil |
| Hydraulic Oil Line (Inlet) | 201-202 | Magnet Oil Filter, O Ring, Band Pipe, Nut |
| Hydraulic Oil Line (Delivery) | 203-204 | O Ring, Tube, Holder, Joint, Gasket |
| Hydraulic Oil Line (Ps) | 205-206 | Joint, Gasket, Adapter, Band Pipe |
| PTO Hydraulic Oil Line | 207-208 | Gasket, Joint Pipe, O Ring, Adapter |
| Hydraulic Outlet Block | 209-210 | O Ring, Spring Relief, Seat Relief Valve, Collar, Joint, Gasket |
| Oil Cooler | 211-212 | Gasket, O Ring, Bolt, Clamp |
| Hydraulic Cylinder | 213-214 | Bush, Gasket, Breather, O Ring, Flange Oil Filler, O Ring w/ O Remote Contr |
| Lift Arm | 215-216 | Piston Hydraulic, O Ring, Ring Back Up, Rod Hydraulic, Collar |
| Feed Back Lever | 217-218 | Joint Spool, Lever Spool Drive, O Ring, Set Plate, Spring Plate, Shaft Back Lever, Lever Feed Back, Rod Feed Back |
| Control Valve | 219-221 | O Ring, Cover Cylinder Front, Collar Adjusting, Shaft, Pipe, Grip, Spring |
| Position Control Lever | 222-223 | Grip Lever, Stopper, Pin, Bolt |
| Top Link | 224-225 | Nipple Grease, Joint Top Link, Holder Top Link RH w/ O Draft, Holder Top Link LH w/ O Draft |
| 3-Point Linkage 1 (Lower Link) | 226-227 | Pin, Washer, Nut, Bolt |
| 3-Point Linkage 2 (Lift Rod) | 228-229 | Assy Rod Lift RH, Rod Lift Lower, Rod Lift Upper, Nipple Grease, Rod Lift LH, Ring Snap |
| Drawbar | 230 | Bolt, Pin |
| PTO Protector | 231-232 | Spring Plate, Bolt, Washer, Nut |
| Front Grille | 233-234 | Bolt, Washer, Nut |
| Hood (Bonnet) Front Support | 235-236 | Bonnet Under, Bonnet Front Lh, Bonnet Front Rh, Support Front, Bracket, Sponge Bonnet Lower |
| Hood (Bonnet) | 237-238 | Handle Mascot, Lock Bonnet, Spring, Cushion |
| Hood(Bonnet) Side | 239-240 | Bonnet Side Lh, Bonnet Side Rh, Bracket, Sponge Bonnet Side, Shield |
| Hood(Bonnet) Side Cover | 241-242 | Rubber Release Rod, Bolt, Washer |
| Shutter Plate | 243-244 | Shield, Cushion Tank, Cushion, Fastener |
| Hood(Bonnet) Rear | 245-246 | Clamp, Screw, Washer, Nut |
| Fender | 247-248 | Label Safety English, Grommet Circle, Grip, Plug |
| Fender Support | 249-250 | Bolt |
| Floor Sheet Cover | 251-252 | Bolt |
| Seat | 253-254 | Cushion, Nut, Bolt, Pin |
| Step | 255-256 | Bush, Bolt, Washer, Nut |
| Tool Box | 257 | Figure Num 01L240 |
| Smv Emblem | 258-259 | Sign Smv, Socket Smv Sign, Socket-Mtg Smv, Bolt Square Neck, Spade Smv Sign, Washer Spring |
| ROPS | 260-262 | Frame LH, Frame RH, Frame Upper, Manual Assembly, Stay Joint |
| Front Wheel (8.3-16) | 263-264 | Wheel ABR8753BR, Label Tire RH ABR8753BR, Wheel ABR8753BL, Label Tire LH ABR8753BL |
| Front Wheel (10.0-16.5) | 265-266 | Tire, Wheel, Label Rh, Label Lh, Stud Wheel, Nut |
| Front Wheel (27-10.50Ll15) | 267-268 | Tire Assy, Tire, Tube, Label Tire, Stud Wheel |
| Front Wheel (305R343 Lsw) | 269-270 | Assy Tire, Tire, Wheel, Label Tire, Stud Wheel, Washer Spring |
| Front Wheel (27*8.50-15) | 271 | Assy Front Wheel, Tire, Wheel, Label Tire, Stud Wheel, Nut |
| Rear Wheel (14.9-24) | 272-273 | Label Tire RH ALR6811R, Label Tire LH ALR6811L, Bolt, Washer |
| Rear Wheel (44*18-20) | 274-275 | Label Tire ALR6803, Stud, Nut, Washer |
| Rear Wheel (17.5L-24) | 276-277 | Label Tire RH ALR6807R, Label Tire LH ALR6807L, Stud, Nut |
| Label 1 (Front) | 278-279 | Label Start Caution, Label Fan Warning, Label Muffler, Label Filler, Label Kubota, Mark Model |
| Label 2 (Rear) | 280-281 | Mark Position, Label ROPS Warning, Label ROPS Caution, Label Shuttle, Label Drawbar, Label Safety |
| Accessories and Service Parts | 282-283 | Assy Key Main Switch, Nut, Washer, Stud |
| Working Light Kit (W/G No.M9551) [Option] | 284-285 | Band Work Light, Manual Instruction, Nut, Washer |
| Front Bumper (W/G No.Mx8068) [Option] | 286 | Bumper, Bolt |
| Front Weight (W/G No.Bl8060-1) [Option] | 287 | Weight Front 25KG, Bolt, Nut, Washer |
| Rear Wheel Weight (W/G No.L8066) [Option] | 288 | Weight Rear Wheel 28KG, Bolt, Nut, Washer |
| Position Control Lever (With Draft) (W/G No.L8311A) [Option] | 289-291 | Bush, Spring Plate, Gasket, Grip Lever |
| Draft Control Lever (With Draft) (W/G No.L8311A) [Option] | 292-293 | Bush, Gasket, Spring Plate, Grip Lever |
| Top Link Holder (With Draft) (W/G No.L8311A) [Option] | 294-295 | Comp Holder Top Link, Nipple Grease, Bush, Nut |
| Swinging Drawbar/Clevis Drawbar [Option] | 296-297 | Drawbar w/ G NO.L9496G, Hitch Drawbar w/ G NO.L9496G, Bolt, Pin |
| Auxiliary Control Valve (W/G No.L8303) [Option] | 298 | Figure Num 01H405 |
| Auxiliary Control Valve (Floating) (W/G No.L8304) [Option] | 299 | Figure Num 01H405 |
| Auxiliary Control Valve Lever (1St) (W/G No.L8561) [Option] | 300-301 | O Ring, Manual Instruction, Bolt, Washer |
| Auxiliary Control Valve Lever (2Nd) (W/G No.L8562) [Option] | 302-303 | Manual Instruction, Bolt, Washer, Pin |
| Auxiliary Control Valve Lever (3Rd) (W/G No.L8563) [Option] | 304-305 | Manual Instruction, Bolt, Washer, Pin |
| Auxiliary Control Valve Coupler (1St) (W/G No.L8561) [Option] | 306-307 | O Ring, Adapter, Assy Coupler Female, Support Coupler, Assy Coupler Male, Cap, Band Cord |
| Auxiliary Control Valve Coupler (2Nd) (W/G No.L8562) [Option] | 308-309 | O Ring, Adapter, Assy Coupler Female, Support Coupler, Assy Coupler Male, Cap |
| Auxiliary Control Valve Coupler (3Rd) (W/G No.L8563) [Option] | 310-311 | O Ring, Adapter, Assy Coupler Female, Support Coupler, Assy Coupler Male, Cap |
| Auxiliary Control Valve Kit Accesories (W/G No.L8561) [Option] | 312 | Figure Num 01H405 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder Head Gasket Thickness (Max) | 1.35mm | p. 8 |
| Piston Oversize Option | +0.25mm | p. 18 |
| Crankpin Undersize Option | -0.40mm/SET | p. 18 |
| Injection Pump Shim Thickness (Min) | 0.175mm | p. 28 |
| Nozzle Holder Washer Adjusting Thickness (Example) | 0.900mm | p. 35 |
| Battery Type | 80D26R | p. 74 |
| Headlight Bulb Wattage | 25W | p. 84 |
| Hazard Light Bulb Wattage | 23W | p. 86 |
| Rear Lamp Bulb Wattage (Dual Filament) | 23/8W | p. 87 |
| Fuse Rating (Example) | 5A | p. 89 |
| HST Servo Regulator Shim Thickness (Max) | 0.5mm | p. 107 |
| HST Input Gear Teeth Count | 23T | p. 112 |
Kubota L4400H Common Problems This Manual Covers
Kubota L4400H starter clicks or cranks slowly with good battery voltage in cold weather p. 74
Pull up the battery diagram on page 74 for the exact terminal and cord arrangement. Before buying replacements, confirm your machine takes the 80D26R battery. Corroded connections usually trace to the cords, support brackets, or retainers, all listed there by part number.
Manual Section: BatteryHydrostatic transmission does not move tractor, slips, or responds weakly under heavy load p. 106
Open the HST relief valve exploded view on page 106, where the shim part numbers live. Pick the right shims and keep the servo regulator shim at or below its 0.5mm maximum. The same view lists the O-rings and plugs behind internal hydrostatic pressure leaks.
Manual Section: HST (Relief Valve) [Component Parts]Engine loses power under load or stalls when engaging work implements after high hours p. 18
Trace the piston kits through the engine parts diagram on page 18. Note the +0.25mm oversize option for worn cylinders as you pull the numbers for rings and pins. Connecting rod assemblies vary by engine block production run, so match yours exactly.
Manual Section: Piston and CrankshaftEngine cranks but will not start or dies shortly after starting due to weak fuel supply p. 27
Find the correct replacement assembly in the injection pump breakout on page 27. Mind the shim part numbers, since minimum thickness runs 0.175mm. Fuel tube and jet start cock numbers sit in that same exploded view.
Manual Section: Injection PumpFront headlights fail to illuminate or flicker intermittently during evening mowing operations p. 84
Look up the bulb and wire harness part numbers in the headlight exploded view on page 84. Order the 25W headlight bulb specified for this model. The lamp unit and cord clamp parts are cataloged there too, for replacing damaged front sections.
Manual Section: Head LightFrequently Asked Questions
What are the replacement specifications for Fuel filter?
The fuel filter element carries part number 1A001-43160 and weighs 0.165 lbs. You'll find it under the 'FUEL FILTER [COMPONENT PARTS]' section of the catalog.
What are the replacement specifications for Air filter?
The air filter uses two elements: an outer, part number TA040-93230 at 1.232 lbs, and an inner, part number TA040-93220 at 0.429 lbs. Both appear in the 'AIR CLEANER' section.
How will I receive this Kubota L4400H Parts Catalog?
A 312-page Parts Catalog in searchable PDF, ready the moment your checkout clears. Read it on a computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Kubota L4400H manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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