Part of the Yanmar Parts Manuals.
Need the right numbers to rebuild your excavators engine? This 25-page Yanmar 3TNE78A-TBY, TB25FR Parts Catalog PDF gives you every exploded view and factory identifier for the complete powertrain. You get crystal-clear diagrams breaking down the cylinder head, gear housing, and fuel injection pump down to the smallest washer. Open to the cooling water system to find exact part numbers for the radiator, thermostat, and V-belt. Track down the exact O-ring for your hydraulic pump bracket, or find the factory replacement for the governors Angleich assembly before you tear anything apart. Stop ordering the wrong components and waiting weeks on shipping returns. Grab this bookmarked file, verify your part numbers right on your phone while standing at the machine, and get the correct order placed today.
What's Inside This Yanmar 3TNE78A-TBY Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1 | Main Bearing, Thrust Bearing, Camshaft Bush, Cylinder Head Bolt, Cylinder Head Gasket |
| Gear Housing | 2 | Oil Seal, Cover, Gasket, O-Ring |
| Flywheel Housing & Oil Sump | 3 | Flywheel Housing, Oil Sump, Drain Plug, Oil Seal, Gasket |
| Cylinder Head & Bonnet | 4-5 | Cylinder Head, Valve, Rocker Arm, Bonnet, Gasket, Valve Stem Seal |
| Suction Manifold % Air Cleaner | 6 | Suction Manifold, Air Cleaner, Air Heater, Air Cleaner Element, Unloader Valve |
| Exhaust Manifold & Silencer | 7 | Exhaust Manifold, Silencer, Gasket, Stud |
| Camshaft & Driving Gear | 8 | Camshaft, Driving Gear, Tappet, Push Rod, Idle Gear |
| Crankshaft & Piston | 9 | Crankshaft Assy, Crankshaft Gear, V-Pulley, Piston, Connecting Rod, Crankpin Bearing |
| Hydraulic Pump | 10 | Assy, Driving Set, Bracket, Ball Bearing |
| Lub. Oil System | 11 | Lub. Oil Pump Assy, Lub. Oil Dipstick, Oil Inlet Pipe, Oil Strainer, Oil Filter, Oil Pressure Sender |
| Cooling Water System | 12 | C.W. Pump, V-Belt, Fan, Thermostat, Radiator, Oil Cooler |
| Fuel Injection Pump | 13-14 | Assy, Camshaft, Plunger, Tappet, Delivery Valve, Control Rack |
| Governor | 15-16 | Governor Weight Assy, Control Shaft, Governor Lever, Governor Spring, Solenoid, Angleich Assy |
| Fuel Injection Valve | 17 | Assy, Nozzle Assy, Nozzle Holder, Nozzle Spring, Fuel Injection Pipe, Fuel Return Pipe |
| Fuel Line | 18 | Fuel Oil Filter, Taper Valve, Fuel Strainer, Fuel Pipe, Fuel Oil Pipe, Feed Pump |
| Staring Motor | 19 | Starter, Switch, Magnet, Armature Assy, Brush, Pinion Assy |
| Generator | 20 | Rotor Assy, Ball Bearing, Brush Assy, Diode Assy, Pulley |
| Gasket Set | 21 | Gasket, Cyl. Head, O-Ring, Seal, Seal Washer |
