Part of the Kubota Parts Manuals.
Finding the right part number before you drive to the counter is what this 332-page Kubota B7800HSD Parts Catalog is built to do. It covers every engine subsystem from crankcase to exhaust manifold, the HST unit, rear differential, all four transmission shafts, pump assemblies, oil line routing, and control valve parts. Every assembly pairs a labeled exploded view with a numbered parts list, quantity column, serial number applicability, and interchangeability codes, so you can tell which superseded part fits your machine. Component weights appear as reference data: 46 kgf for the crankcase, 12.1 kgf for the cylinder head, 0.4 kgf for a piston. Bookmarked by system, searchable by keyword, and ready on any device when you need to order.
What's Inside This Kubota B7800HSD Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Fuel Camshaft and Governor Shaft, Injection Pump, Governor, Speed Control Plate, Nozzle Holder and Glow Plug, Nozzle Holder, Fuel Pump, Air Cleaner, Accelerator Lever, Fuel Tank, Fuel Pipe, Fuel Filter, Stop Solenoid, Speed Control Pedal | |
| Cooling System | Water Flange and Thermostat, Water Pump, Fan, Water Pipe, Radiator, Reserve Tank | |
| Engine | Crankcase, Oil Pan, Cylinder Head, Gear Case, Oil Filter, Main Bearing Case, Camshaft and Idle Gear Shaft, Piston and Crankshaft, Flywheel, Valve and Rocker Arm, Inlet Manifold, Exhaust Manifold, Muffler, Upper Gasket Kit, Lower Gasket Kit, Differential Gear Case | |
| Electrical System | Dynamo, Starter, Battery, Switch, Panel Board, Head Light, Hazard Light, Tail Light, Winker Lamp, Electrical Wiring | |
| Clutch & Transmission | Clutch, Clutch Rod, Clutch Pedal, Clutch Housing, Transmission Case, Clutch Shaft, Range Gear Shift Lever, PTO Gear Shift Lever | |
| PTO | PTO Shaft, Mid PTO, PTO Protector | |
| Rear Axle, Differential & Brakes | Rear Axle Case, Rear Differential, Rear Axle, Brake, Brake Rod, Parking Brake Lever, Brake Pedal, Differential Lock Pedal, Rear Wheel | |
| Front Axle & Steering | Propeller Shaft, Front Wheel Propeller Shaft, Front Wheel Drive Lever, Front Axle Frame, Front Axle Case, Front Differential, Differential Gear Shaft, Front Axle, Tie Rod, Steering Handle, Steering Post, Front Wheel | |
| Hydraulics & 3-Point Hitch | Hydraulic Control Lever, Hydraulic Pump, Hydraulic Oil Line, Hydraulic Cylinder, Feed Back Lever, Control Valve, Point Linkage 2, Point Linkage 1, Hitch/Drawbar | |
| Body & Operator Station | Head Cover, Center Frame, Sub Frame, Front Grille, Bonnet, Panel Cover, Side Cover, Shutter Plate, Fender, Floor Seat, Seat Support, Step, ROPS | |
| Other Components | Dipstick and Guide, Idle Apparatus, HST, Front Shaft, 2nd Shaft, 3rd Shaft, 4th Shaft, Speed Set Lever, Neutral Holder Link, Front Drive Shaft, Drag Link, Lower Link, Check Chain, Smv Emblem |
Every system also includes interchangeability symbols definition, a diagram, and a parts list.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Crankcase Weight | 46 kgf (101.2 lb) | p. 8 |
| Oil Pan Weight | 1.7 kgf (3.74 lb) | p. 13 |
| Cylinder Head Weight | 12.1 kgf (26.62 lb) | p. 16 |
| Oil Filter Weight | 0.4 kgf (0.88 lb) | p. 24 |
| Piston (STD) Weight | 0.4 kgf (0.88 lb) | p. 33 |
| Piston (+0.5mm) Weight | 0.415 kgf (0.913 lb) | p. 33 |
| Crankshaft Weight | 5 kgf (11 lb) | p. 33 |
| Flywheel Weight | 17.3 kgf (38.06 lb) | p. 36 |
| Injection Pump Shim Thickness | 0.20mm | p. 43 |
| Valve Inlet Weight | 0.005 kgf (0.011 lb) | p. 65 |
| Radiator Weight | 3.5 kgf (7.7 lb) | p. 98 |
| Battery Bracket Weight | 2.25 kgf (4.95 lb) | p. 115 |
Kubota B7800HSD Common Problems This Manual Covers
Kubota B7800HSD turns over but won't start, suspecting a failed fuel shutoff solenoid or blown fuse.
Check the stop solenoid exploded view on page 101. Locate the correct replacement solenoid part number for your specific serial number. Verify the battery bracket, weighing 2.25 kgf (4.95 lb) on page 115, is securely mounted to prevent wiring harness chafing.
Manual Section: Stop Solenoid p. 101Hydrostatic transmission loses drive power after warming up, needing internal replacement components.
Inspect the HST component parts diagram on page 163 to pin down the internal seals and relief valves you need. Cross-reference the hydraulic oil filter part number on page 23 and swap the 0.4 kgf (0.88 lb) filter during the fluid change.
Manual Section: HST [Component Parts] p. 163Cranking but engine will not fire due to restricted fuel flow or damaged injection pump shims.
Trace the injection pump breakdown on page 42 to identify the exact pump assembly, then order the 0.20mm injection pump shim shown on page 43 to restore timing. Check the fuel filter component parts list on page 89 while you're at it.
Manual Section: Injection Pump p. 42Uneven pulling in four-wheel drive with popping noises from the front drive assembly.
Examine the front axle case parts diagram on page 217 for damaged internal gears or bearings. Match the parts against the front drive shaft illustration on page 230, and replace the 3.5 kgf (7.7 lb) radiator on page 98 if debris has wrecked it.
Manual Section: Front Axle Case p. 217Frequently Asked Questions
What causes a Kubota B7800 no-start fuel cut-off or solenoid problem?
As a parts catalog, it won't diagnose what causes a no-start fuel cut-off or solenoid fault, but it does list the parts involved: ASSY SOLENOID STOP (Part No. 17208-60010) and SOLENOID STOP (Part No. 32721-60010) within the fuel shutoff system. p. 103
What are the replacement specifications for fuel filter?
The fuel filter replacement is the ASSY FILTER FUEL, Part No. 6A320-58862, at 0.09 kgf (0.198 lb). Inside that assembly, the FILTER (Part No. 6A320-59930) is a component part weighing 0.025 kgf (0.055 lb). p. 90
What are the replacement specifications for fuse?
Several fuse specifications are listed for the electrical wiring. A 30A FUSE (Part No. 1G111-65720) weighs 0.009 kgf (0.0198 lb), a 5A FUSE AUTO (Part No. 66426-80010) weighs 0.01 kgf (0.022 lb), and a 10A FUSE AUTO (Part No. 36730-75550 or 48100-55880) weighs 0.001 kgf (0.0022 lb) or 0.01 kgf (0.022 lb) respectively. p. 138
How will I receive this Kubota B7800HSD Parts Catalog?
Download is instant. The full 332-page searchable Parts Catalog is yours immediately after payment, ready on a laptop, tablet, or phone out in the shop.
Is this Kubota B7800HSD Parts Catalog printable?
Yes, it prints cleanly. The PDF is DRM-free, so print whatever sections you want to take out to the shop. Standard letter or A4 paper works.
Does this Kubota B7800HSD Parts Catalog include hydraulic component diagrams?
It includes exploded parts diagrams of the hydraulic components — pump, control valve, cylinder, and oil lines — with OEM part numbers and quantities. This is a parts catalog, not a workshop repair manual, so the diagrams show part identification and assembly layout rather than circuit-level hydraulic flow.
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