This is the illustrated parts catalog for the Kubota G1800 diesel riding mower, a 193 page reference that matches exploded diagrams to Kubota part numbers for the whole machine. It runs from the crankcase, injection pump, and cooling system through the HST transmission, rear axle, brakes, steering, hydraulics, and mower related hardware.Every parts page gives the reference number, part number, quantity per assembly, and the serial number range a part fits, plus country codes for region specific variations. Some components changed during the G1800 production run, so the serial ranges keep you from ordering an obsolete or incompatible part.Use it to track down the G1800 drive shaft and hydrostatic parts owners replace most, confirm a number before you buy, and rebuild neglected assemblies with the confidence that the pieces belong together.
What's Inside This Kubota G1800 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Clutch & Transmission | Transmission Case, Universal Joint/HST Fan | |
| Fuel System | Nozzle Holder/Glow Plug, Nozzle Holder, Injection Pump, Speed Control Plate, Governor, Stop Solenoid, Air Cleaner, Accelerator Lever, Fuel Tank, Fuel Pipe, Speed Control Pedal | |
| Cooling System | Water Pump, Water Flange/Thermostat, Radiator | |
| Engine | Crankcase, Oil Pan, Piston/Crankshaft, Main Bearing Case, Flywheel, Cylinder Head, Valve/Rocker Arm, Head Cover, Inlet Manifold, Exhaust Manifold, Camshaft, Gear Case, Upper Gasket Kit, Lower Gasket Kit, Muffler, Steering Gear Case | |
| Electrical System | Dynamo, Starter, Battery, Light, Wire Harness | |
| PTO | Rear PTO, PTO Brake | |
| Rear Axle, Differential & Brakes | Rear Axle Case, Rear Axle, Rear Wheel, Brake Shaft, Brake, Brake Rod, Brake Pedal | |
| Front Axle & Steering | Front Axle/Knuckle Arm, Front Wheel, Steering Wheel | |
| Hydraulics & 3-Point Hitch | Control Valve, Hydraulic Pipe 1, Hydraulic Pipe 2, Lift Cylinder, Hydraulic Outlet, 3-Point Linkage | |
| Loader, Backhoe & Attachments | Mower Swing Stopper | |
| Body & Operator Station | Dashboard, Frame, Hood, Panel, Fender, Seat | |
| Decals & Accessories | Label, Accessories and Service Parts | |
| Other Components | Cruise Control Plate, Cruise Control Lever, Mower Assist Spring |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Injection Pump Shim Thickness (S.No. <=489915) | 0.15MM | p. 42 |
| Rear Axle Weight (2WS, S.No. >=14614) | 3 kgf | p. 130 |
Kubota G1800 Common Problems This Manual Covers
Drive shaft failure and driveline noise
The drive shaft is a known weak point on the G1800 and its failure causes noise or loss of motion. This section breaks out the universal joint and HST fan parts so you can source the correct driveline components.
Manual Section: Universal Joint/HST Fan p. 99Weak or noisy hydrostatic drive
Hydrostatic drive noise or weak traction often points to worn HST parts. The transmission case section covers the HST and its component parts for accurate ordering.
Manual Section: Transmission Case p. 93Deck and rear PTO drive noise
Rough or noisy deck drive can trace to worn rear PTO gears and bearings under a neglected maintenance backlog. The rear PTO breakdown identifies the parts involved.
Manual Section: Rear PTO p. 110Overheating and radiator replacement
Older G1800 units can need radiator repair or replacement after years of cooling system neglect. This section details the radiator assembly and related cooling parts.
Manual Section: Radiator p. 68Missing or worn cruise control linkage
The cruise control handle and linkage can go missing or wear out after prior removal. The cruise control lever section shows the exact parts needed to restore it.
Manual Section: Cruise Control Lever p. 119Electrical and no start faults
Weak batteries and tired wiring cause hard starting on older units. The battery section identifies the battery and its mounting hardware for replacement.
Manual Section: Battery p. 81Frequently Asked Questions
Which machine does this catalog cover?
It is the parts catalog for the Kubota G1800 diesel riding mower, covering the engine, drivetrain, and chassis assemblies with exploded diagrams and Kubota part numbers.
Can I find the drive shaft and driveline parts?
Yes. The universal joint and HST fan section lists the driveline parts, including the drive shaft that owners cite as the G1800's known weak point. p. 99
Does it list parts by serial number?
Yes. Each parts page includes the S.No. column so you match a part to your machine's serial number range, along with country codes for region specific variations.
Does it cover the HST transmission parts?
Yes. The transmission case section breaks out the HST and its component parts so you can identify and order the correct hydrostatic drive pieces. p. 93
How will I receive this Kubota G1800 Parts Manual?
Instant PDF download. The full 193-page searchable Parts Manual lands in your account right after payment. Open it on a laptop, tablet, or phone in the shop.
Can I print this manual?
Yes. The PDF has no DRM restrictions, so you can print any page or section you need for your shop. Works with any standard printer.
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