Hunting down the right components for your gasoline engine? All 20 pages of this Yanmar GA120 parts catalog pdf (OEM #Y00B4451) focus on one thing: getting your GA120RDZB and GA120 models identified correctly. You get highly detailed exploded views covering the complete cylinder block, cylinder head, and bonnet assemblies. Inside, find every factory part number and visual layout required to rebuild your carburetor, governor, and crankshaft systems without second-guessing. Verify the exact P-18.0 O-ring for your assembly or confirm you need M8x18 studs before placing a hardware order. Your machine is down, and waiting on the wrong shipment costs you time. Download this bookmarked file instantly, open it on your phone right at the workbench, and order the correct factory parts on the first try.
What's Inside This Yanmar GA120RDZB, GA120 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1-3 | Block Assy, Cylinder, Parallel Pin, Seal, Oil, Ball Bearing, Cover Assy |
| Cylinder Head & Bonnet | 4-5 | Head Assy, Cylinder, Valve, Intake, Exhaust, Arm, Rocker |
| Label | 6-7 | Ohv Mark, Caution, Drain, Air Cleaner, Recoil Start |
| Air Cleaner & Muffler | 8-9 | Cleaner Assy, Air, Element, Air Cleaner, Body, Muffler, Pipe Assy |
| Crankshaft, Piston & Camshaft | 10-11 | Camshaft Assy, Spring, Decomp., Crankshaft Assy, Piston Assy, Ring Set, Piston, Rod Assy |
| Carburetor | 12-13 | Assy, Valve, Throttle, Float Assy, Body, Float Chamber, Nozzle, Main |
| Governor & Control Device | 14-20 | Spindle, Governor, Shaft, Gov. Lever, Gear Assy, Gov., Spring |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Parallel Pin Size | 8x12 mm | p. 16 |
| O-Ring Size | P-18.0 | p. 2 |
| Bolt Size | M6x25 | p. 2 |
| Nut Thread Size | M6x0.5 | p. 4 |
| Stud Size | M8x18 | p. 4 |
| Key Size | 4x10 mm | p. 16 |
| Hose Diameter | D5/3 | p. 12 |
| Circlip Size | E-4 | p. 18 |
Yanmar GA120RDZB, GA120 Common Problems This Manual Covers
Need replacement main nozzle part numbers for Yanmar GA120RDZB engine running rough under load p. 12
Inspect the carburetor exploded view on page 12. Locate the main nozzle and the float chamber body. Check the parts list for the exact D5/3 hose diameter and M4x8 bolt sizes to ensure you order the correct matching hardware kit.
Manual Section: CarburetorTrying to find the correct air cleaner element and housing bolt numbers for black smoke under load p. 8
Review the air cleaner assembly breakdown on page 8. Identify the specific air cleaner element part number for your serial range. Verify the required M6x70 bolt sizes in the components list before ordering replacement fastening hardware for the muffler pipe assembly.
Manual Section: Air Cleaner & MufflerLooking up exact cylinder block cover seal and o-ring part numbers for oil leaking around the base p. 2
Check the cylinder block parts number list on page 2. Find the oil seal and ball bearing part numbers. Cross-reference the required P-18.0 o-ring size and M6x25 bolt sizes to ensure your replacement gasket kit includes all necessary installation hardware.
Manual Section: Cylinder BlockNeed to identify the proper governor spring and linkage pin part numbers for engine surging or over-revving p. 16
Examine the governor gear assembly diagram on page 16. Match your governor lever and spring with the listed part numbers. Verify the 8x12 mm parallel pin size and 4x10 mm key size in the index to order the correct replacement linkage components.
Manual Section: Governor & Control DeviceFrequently Asked Questions
How do you fix need replacement main nozzle part numbers for Yanmar GA120RDZB engine running rough under load?
Inspect the carburetor exploded view on page 12. Locate the main nozzle and the float chamber body. Check the parts list for the exact D5/3 hose diameter and M4x8 bolt sizes to ensure you order the correct matching hardware kit.
How do you fix trying to find the correct air cleaner element and housing bolt numbers for black smoke under load?
Review the air cleaner assembly breakdown on page 8. Identify the specific air cleaner element part number for your serial range. Verify the required M6x70 bolt sizes in the components list before ordering replacement fastening hardware for the muffler pipe assembly.
How do you fix looking up exact cylinder block cover seal and o-ring part numbers for oil leaking around the base?
Check the cylinder block parts number list on page 2. Find the oil seal and ball bearing part numbers. Cross-reference the required P-18.0 o-ring size and M6x25 bolt sizes to ensure your replacement gasket kit includes all necessary installation hardware.
How do you fix need to identify the proper governor spring and linkage pin part numbers for engine surging or over-revving?
Examine the governor gear assembly diagram on page 16. Match your governor lever and spring with the listed part numbers. Verify the 8x12 mm parallel pin size and 4x10 mm key size in the index to order the correct replacement linkage components.
How will I receive this Yanmar GA120RDZB, GA120 Parts Catalog?
This is a 20-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.
Is this Yanmar GA120RDZB, GA120 Parts Catalog printable?
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.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text content. The text quality is crisp and easy to read throughout the document. All diagrams and illustrations are clean line drawings, with sharp details and perfectly readable labels. The pages are very clean, exhibiting no scan artifacts, stains, marks, or skewed content. There are no notable blank or filler pages present.
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