All 193 pages of this Kubota G1800 Parts Catalog zero in on one job: finding the exact part number before you waste half a day chasing the wrong component. Organized across engine, drivetrain, chassis, hydraulic, and electrical systems, you get 40 pages of indexed parts lists plus 12 pages of engine component diagrams covering everything from piston ring assemblies and injection pump plunger kits to nozzle holder component parts and camshaft tappets. Inside the drivetrain section alone: HST internals, rear PTO component breakdowns, cruise control linkage, and rear axle differentials for 2WS configurations. Need to cross-reference a cylinder head swap by serial number? The catalog flags S.No. >=489916 assemblies at 7.35 kgf, and injection pump shim thickness splits at S.No. <=489915 for 0.15MM. Your machine is down and the dealer wants a week out. Open this on your tablet, hit a bookmark, find the part number, and call the supplier today.
What's Inside This Kubota G1800 Parts Manual
| System | Pages |
|---|---|
| Crankcase | 5-6 |
| Oil Pan | 7-9 |
| Piston/Crankshaft | 10-11 |
| Main Bearing Case | 12-13 |
| Flywheel | 14-15 |
| Cylinder Head | 16-18 |
| Valve/Rocker Arm | 19-20 |
| Nozzle Holder/Glow Plug | 21-22 |
| Nozzle Holder [Component Parts] | 23-24 |
| Head Cover | 25-27 |
| Inlet Manifold | 28-29 |
| Exhaust Manifold | 30-31 |
| Camshaft | 32-33 |
| Gear Case | 34-35 |
| Water Pump | 36-37 |
| Water Flange/Thermostat | 38-40 |
| Injection Pump | 41-42 |
| Injection Pump [Component Parts] | 43-44 |
| Speed Control Plate | 45-46 |
| Governor | 47-48 |
| Stop Solenoid | 49-51 |
| Upper Gasket Kit | 52-53 |
| Lower Gasket Kit | 54-55 |
| Air Cleaner | 56-57 |
| Muffler | 58-60 |
| Accelerator Lever | 61-62 |
| Fuel Tank | 63-64 |
| Fuel Pipe | 65-67 |
| Radiator | 68-70 |
| Dynamo | 73-74 |
| Dynamo [Component Parts] | 75-76 |
| Starter [Component Parts] | 77-80 |
| Battery | 81-83 |
| Light | 84-85 |
| Dashboard | 86-89 |
| Wire Harness | 90-92 |
| Transmission Case | 93-94 |
| Universal Joint/HST Fan | 99-103 |
| Rear PTO | 110-112 |
| Rear PTO [Component Parts] | 113-116 |
| Cruise Control Plate | 117-118 |
| Cruise Control Lever | 119-121 |
| Speed Control Pedal | 122-124 |
| Rear Axle Case | 127-128 |
| Rear Axle [2Ws] | 129-130 |
| Rear Wheel (23 X 10.5-12) [2Ws] | 131-132 |
| PTO Brake | 133-134 |
| Brake Shaft | 135-136 |
| Brake | 137-138 |
| Brake Rod | 139-140 |
| Brake Pedal | 141-142 |
| Front Axle/Knuckle Arm | 143-144 |
| Front Wheel (16 X 6.50-8) | 147-148 |
| Frame | 149-151 |
| Steering Gear Case | 152-154 |
| Steering Wheel | 155-156 |
| Control Valve | 157-159 |
| Control Valve [Component Parts] | 160-161 |
| Hydraulic Pipe 1 | 162-164 |
| Hydraulic Pipe 2 | 165-166 |
| Lift Cylinder | 167-168 |
| Hydraulic Outlet [Old Type] [Option] | 169-170 |
| Hydraulic Outlet [New Type] [Option] | 171-172 |
| 3-Point Linkage [Option] | 173-174 |
| Mower Assist Spring [Option] | 175-176 |
| Mower Swing Stopper [Option] | 177-178 |
| Hood (Bonnet) | 179-180 |
| Panel | 181-183 |
| Fender | 184-185 |
| Seat [A] [Ca] | 186-187 |
| Seat [Au] [Nz] | 188-189 |
| Label | 190-191 |
| Accessories and Service Parts | 192-193 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Crankcase Assembly Weight | 22.8 kgf | p. 6 |
| Cylinder Head Assembly Weight (S.No. >=489916) | 7.35 kgf | p. 18 |
| Injection Pump Shim Thickness (S.No. <=489915) | 0.15MM | p. 42 |
| Radiator Assembly Weight | 5.5 kgf | p. 70 |
| Battery Assembly Weight ([A] [CA], S.No. <=13282) | 9.3 kgf | p. 83 |
| HST Assembly Weight (S.No. >=13839) | 12 kgf | p. 96 |
| Rear Differential Assembly Weight | 4.5 kgf | p. 126 |
| Rear Axle Weight (2WS, S.No. >=14614) | 3 kgf | p. 130 |
| Front Axle Assembly Weight | 6 kgf | p. 144 |
| Frame Assembly Weight (S.No. >=16460) | 52 kgf | p. 151 |
Kubota G1800 Common Problems This Manual Covers
Kubota G1800 drive shaft part number lookup for driveline replacement or rebuild p. 99
Open the Universal Joint and HST Fan exploded view starting on page 99. Locate the drive shaft assembly and cross-shaft components in the parts list. Verify your serial number range before ordering: the transmission case overview on page 93 shows how the driveline components relate to the HST (assembly weight 12 kgf for S.No. >=13839, per page 96). Record every part number from the exploded view before calling your dealer.
Manual Section: Universal Joint/HST FanHST hydrostatic transmission parts identification for fluid-related wear or component swap p. 93
Find the Transmission Case diagram on page 93, then cross into the HST component section starting there. The HST assembly weighs 12 kgf (S.No. >=13839). Identify each internal component by callout number in the exploded view and match it to the parts list. Cross-reference serial number cutoffs carefully: G1800 HST builds changed at S.No. 13839, so ordering without verifying the serial break will get you the wrong assembly.
Manual Section: Transmission CaseRadiator assembly part number identification for cooling system replacement on older units p. 68
Turn to page 68 for the Radiator exploded view and parts number list (pages 68-70). The complete radiator assembly weighs 5.5 kgf (page 70). Note the full assembly part number from the parts list, then check whether you need the assembly or individual sub-components such as hoses or the water flange. The Water Flange and Thermostat parts are listed separately on pages 38-40 if only upper cooling components need replacement.
Manual Section: RadiatorCruise control handle or linkage part number missing after wear or previous removal p. 119
The Cruise Control Lever parts list is on pages 119-121; the Cruise Control Plate (bracket and hardware) is on pages 117-118. Find the handle assembly callout in the exploded view on page 119 and write down the exact part number. If the linkage rod or pin is also gone, the Speed Control Pedal section on pages 122-124 covers connected pedal-side hardware that often gets disturbed at the same time.
Manual Section: Cruise Control LeverEngine won't turn over or starts hard in cold weather, need starter or battery part numbers p. 81
Battery part numbers are listed on pages 81-83; note the serial-number split: S.No. <=13282 uses a 9.3 kgf battery assembly ([A][CA] markets). Starter component parts are on pages 77-80. Identify which sub-components you need (brushes, drive gear, solenoid) from the exploded view. If the issue is electrical rather than mechanical, check the Wire Harness section on pages 90-92 for connector and harness part numbers before ordering.
Manual Section: BatteryDeck gearbox or rear PTO parts identification for noise or oil leak repair p. 110
Rear PTO parts are listed on pages 110-112, with component-level detail on pages 113-116. Locate the gearbox housing, seal, and bearing callouts in the exploded view and note each part number separately: seals and bearings are listed individually and not bundled in a kit on this diagram. If the PTO brake is also suspect, the PTO Brake section starts on page 133.
Manual Section: Rear PTOFrequently Asked Questions
What are the replacement specifications for drive shaft?
The manual lists the SHAFT DRIVE (Part No. 79840-22150) for serial numbers less than or equal to 13508 with a weight of 0.29 kgf (0.638 lb). For serial numbers greater than or equal to 13509, the SHAFT DRIVE (Part No. 79840-22154) has a weight of 0.37 kgf (0.814 lb).
What are the replacement specifications for radiator?
The ASSY RADIATOR (Part No. 16861-72060) has a weight specification of 5.5 kgf (12.1 lb). This information is found in the RADIATOR section of the manual.
How will I receive this Kubota G1800 Parts Manual?
Instant PDF download. You get the full 193-page searchable Parts Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this Kubota G1800 manual?
Yes. The PDF has no DRM restrictions — print any page or section you need for your shop. Works with any standard printer.
Document Quality
This document is a scanned PDF, but it includes an OCR layer, so you can search and copy text from every page. The text quality is consistently clear and easy to read throughout. Diagrams and illustrations are raster images, meaning they may appear pixelated when zoomed in, but their labels are generally readable. The pages are clean, without any noticeable stains, marks, or skewing. There is one blank page at the very end.
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