Part of the Yanmar Parts Manuals.
Cylinder block to short block, this Yanmar parts catalog walks the 3TNM72-AFS diesel end to end: gear housing, mounting flange and oil sump, cylinder head, camshaft, crankshaft and pistons, the lube oil and cooling water systems, injection pump, governor, injectors, fuel filter, starting motor and generator. It is Yanmar publication 0CW10-G61100, the factory catalog for this three-cylinder engine as fitted to ZTR mowers, 27 pages in a small, quick-loading PDF.
Anyone who has pulled a leaking water pump off a mower engine knows the guessing game that follows: which gasket, which O-ring, whether that fastener is a bolt or a stud. The exploded views here settle it with Yanmar part numbers, so the order you place is the order that fits.
Download it, print the page you need, and get the engine back together before the grass gets ahead of you.
What's Inside This Yanmar 3TNM72-AFS (Ferris ZTR Mower) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface. | 2-3 | - |
| Content. | 4 | - |
| Cylinder Block | 5 | Cylinder Block Assy, Knock Pipe, Thrust Metal Assy, Idle Gear Shaft, Cylinder Head Gasket, Fop Bolt Gasket, Oil Seal, Pump Gasket |
| Gear Housing | 6 | Case Gear, Pump Timing Cover, Oil Seal, Lub. Oil Supply Cap |
| Mounting Flange & Oil Sump | 7 | Mounting Flange, Lub. Oil Sump Assy, Pin, Bolt |
| Cylinder Head & Bonnet | 8 | Nozzle Protector, Nozzle Gasket, Valve Cap, Cylinder Head Assy, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer |
| Exhaust Manifold | 9 | Manifold Gasket, Silencer Gasket, Stud |
| Camshaft & Driving Gear | 10 | Tappet, Push Rod, Camshaft Assy, Thrust Bearing, Idle Cmp Gear, Fuel Pump Gear, Idle Gear Bush |
| Crankshaft & Piston | 11 | Crankshaft Assy, Crankshaft Gear, Flywheel Assy, Ring Gear, Crankshaft V-pulley, Piston Assy, Piston Ring Set, Connecting Rod Assy |
| Lub. Oil System | 12 | Lub. Oil Pump Assy, Lub. Oil Dipstick, Dipstick Guide, Lub. Oil Pipe Assy, Cover, Pk, Oil Pressure Switch, Lub. Oil Filter Assy |
| Cooling Water System | 13 | Water Pump Assy, Water Pump Cover, Pk Pump, Water Pump Gasket, Round Gasket, Water Pump V-pulley, V-belt, Cooling Fan |
| Fuel Injection Pump | 14-15 | Injection Pump Assy, Camshaft, Retainer, Plunger Assy, Flange, Spring Retainer, Plunger Spring, Fo Tappet |
| Governor | 16-17 | Case Gasket, Cover Gasket, Governor Case Assy, Governor N Case Assy, Link Cmp, CLASIFIEDMARK93 Link, Lever Shaft, Control Shaft Assy |
| Fuel Injection Valve | 18 | Fuel Injector, Nozzle Cmp, Nozzle Holder Assy, Nozzle Spring, Spring Seat, Valve Stop Spacer, Pipe Retainer, Fuel Injection Pipe |
| Fuel Filter | 19 | Pipe Joint, Fuel Feed Pump Assy, Fuel Filter Assy, Spring, Lever, Strainer Cup, Retaining Ring, Strainer Element |
| Starting Motor | 20 | 2KW Starter Assy, Field Coil Assy, Brush Holder Assy, Brush, Brush Spring, Rear Cover Assy, Gear, Bracket |
| Generator | 21 | 12V-40A Generator, Assy Generator, Rz Assy, Cover, Belt Adjuster, Spacer, Diode, Timer |
| Gasket Set | 22 | Gasket Kit, Cylinder Head Gasket, Fop Bolt Gasket, Bonnet Gasket, Bonnet Cover Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Gasket |
| Short Block | 23 | Short Block Assy, Cylinder Block Assy, Tappet, Camshaft Assy, Crankshaft Assy, Piston Assy, Connecting Rod Assy, Crank Pin Metal Assy |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Metal Undersize | 0.25 | p. 5 |
| Crank Pin Metal Undersize | 0.25 | p. 11 |
| Piston Ring Set Oversize | 0.25 | p. 11 |
| Generator Rating | 12V-40A | p. 21 |
| O-RING 1A P-10A Size | P-10A | p. 19 |
| O-RING 1A P-18.0 Size | P-18.0 | p. 22 |
Yanmar 3TNM72-AFS (Ferris ZTR Mower) Common Problems This Manual Covers
Hard starting from a clogged fuel filter
Stale diesel and debris plug the filter element and strainer, starving the engine until it cranks without firing. The Fuel Filter section breaks out the filter assembly, fuel feed pump, cup and strainer element so you can replace the whole fuel path in one order.
Manual Section: Fuel Filter p. 19Rough running from worn injectors
A tired nozzle dribbles instead of atomizing, and the engine smokes, stumbles and loses power under load. The Fuel Injection Valve section identifies the injector, nozzle, holder assembly and injection pipes by part number.
Manual Section: Fuel Injection Valve p. 18Overheating from water pump or belt trouble
This is a water-cooled diesel, so a seeping pump seal, stuck thermostat or glazed V-belt will cook it in a long mowing session. The Cooling Water System section covers the water pump assembly, thermostat, cooling fan, V-belt and sub tank.
Manual Section: Cooling Water System p. 13Oil pressure light coming on
A flickering warning light can be a failing sender or a genuine pump problem, and you need the right parts to chase either. The Lub. Oil System section lists the oil pump assembly, dipstick, oil pipe assembly and oil pressure switch.
Manual Section: Lub. Oil System p. 12Slow cranking or a dead starter
Brushes wear and pinion gears chew up after years of seasonal starts. The Starting Motor section breaks the starter down to the field coil, brush holder assembly and pinion gear, so you can rebuild it instead of buying a whole unit.
Manual Section: Starting Motor p. 20Compression loss on a high-hours engine
Hard starting and blow-by on an old three-cylinder Yanmar usually come down to worn rings and journals. The Crankshaft & Piston section lists piston and rod assemblies, plus 0.25 oversize piston ring sets and 0.25 undersize crank pin metal for a rebuild on a worn block.
Manual Section: Crankshaft & Piston p. 11Battery not keeping a charge
If the mower needs a jump every weekend, the charging side deserves a look before the battery gets blamed again. The Generator section covers the engine's 12V-40A generator.
Manual Section: Generator p. 21Frequently Asked Questions
Which engine and machines does this catalog cover?
It covers the Yanmar 3TNM72-AFS three-cylinder diesel as fitted to ZTR mowers, published by Yanmar as catalog 0CW10-G61100. It is an engine parts catalog, so it documents the engine and its accessories, not the mower deck or chassis.
Does it list rebuild parts like oversize rings and undersize bearings?
Yes. The Crankshaft & Piston section lists 0.25 oversize piston ring sets and 0.25 undersize crank pin metal, alongside the crankshaft, piston, connecting rod and flywheel assemblies, so you can order machining-size parts for a worn engine. p. 11
Does it cover the fuel injection system?
Yes, across four sections. The Fuel Injection Pump section covers the pump, plunger, delivery valve, control rack and governor camshaft; separate Governor, Fuel Injection Valve and Fuel Filter sections cover the linkage, stop solenoid, injectors, feed pump and filter elements. p. 14
Are gaskets and seals included in the catalog?
Yes. Gaskets, O-rings and seals appear throughout the exploded views, from the cylinder head gasket to the oil sump, and a dedicated Gasket Set section lists the complete set by part number for a full reseal or rebuild. p. 22
Is this Yanmar 3TNM72-AFS manual a PDF I download?
This is a 27-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this Yanmar 3TNM72-AFS manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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