Part of the Yanmar Parts Manuals.
All 118 pages of this Yanmar B22-2B, 3TNE78A-B1 Parts Catalog (OEM #000Y00S3870) map every replaceable component on your 1999 Crawler Backhoe, from engine mounts and fuel system hardware to the complete hydraulic piping network, travel motors, and boom pins. You get exploded views across every system: 3TNE78A engine internals, swing and boom cylinders, control valves, crawler track links, canopy hardware, and the full boom-and-arm assembly, each with factory part numbers and cross-references. Every hydraulic subsystem is diagrammed separately so you can pinpoint the exact fitting, seal, or port without second-guessing the assembly. OEM data extends to the tool kit itself: a 5X45mm lock pin, 8X10mm wrench, and 800g grease gun, each called out by part number for this machine. Order the wrong part once and you know what it costs. Bookmarked by system and keyword-searchable, open it on any device and get the right number before you call the counter.
What's Inside This Yanmar B22-2B, 3TNE78A - B1 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Accelerator, Fuel Tank & Fuel Pipe | |
| Cooling System | Radiator & Mount | |
| Engine | Frame & Turning Bearing, Hyd. Oil Pump & Joint | |
| Electrical System | Battery, Work Lamp | |
| Hydraulics & 3-Point Hitch | Boom Cylinder, Arm Cylinder, Bucket Cylinder, Swing Cylinder, Blade Cylinder, Control Valve, Remote Control Valve | |
| Body & Operator Station | Frame Cover, Step, Seat & Seat Mount, Bonnet, Canopy, Hyd. Oil Tank | |
| Decals & Accessories | Label, Tool | |
| Other Components | Inlet Hose & Exhaust Pipe, Engine Mount, Electric Part, Roller & Adjust, Crawler, Control Equipment, Travel Motor, Turning Motor, Swivel Joint, Hyd. Oil Piping, Control Piping, Greasing, Boom & Arm, Bucket Pin, Blade |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| YANMAR PEACOCK GREEN Munsell No. | 3.8BG5.31/9.15 | p. 2 |
| YANMAR NEW DEEP GREEN Color Code | 88 | p. 2 |
| PIN dimension (Fig. 2, Item 3) | 5X45 mm | p. 14 |
| WRENCH size (Fig. 2, Item 7) | 8X10 mm | p. 18 |
| GREASE GUN capacity (Fig. 2, Item 17) | 800 g | p. 14 |
| BOLT size (Fig. 3, Item 5) | M8x55 mm | p. 16 |
| GROMMET dimensions (Fig. 4, Item 8) | 16x20x4.5 mm | p. 18 |
| BOLT size (Fig. 5, Item 10) | M12x30 mm | p. 18 |
| O-RING size (Fig. 6, Item 24) | 1A P-16.0 | p. 22 |
Yanmar B22-2B, 3TNE78A - B1 Common Problems This Manual Covers
Yanmar B22-2B excavator cab area rattles loudly during operation due to missing frame cover grommets p. 18
Inspect the frame and turning bearing components on page 18 to find the correct replacement hardware. Locate the 16x20x4.5 mm grommet in the parts list. Cross-reference the diagram numbers to order the exact rubber inserts and M12x30 mm bolts needed to secure the covers.
Manual Section: Frame & Turning BearingTravel control pedal feels loose and linkage binds when trying to move forward or reverse p. 14
Check the travel control equipment exploded view on page 14 to identify worn linkage components. Locate the specific 5X45 mm lock pin in the parts list to replace the missing hardware. Review the diagram to ensure you order the correct pedal assembly and shaft bushings.
Manual Section: Control Equipment (Travel)Front blade control arm drops suddenly because the lever bracket hardware is stripped or missing p. 16
Review the blade control equipment diagram on page 16 to find the correct bracket components. Identify the exact M8x55 mm bolt required to secure the arm assembly. Order the correct springs and lever guides from the parts list to restore proper tension and operation.
Manual Section: Control Equipment (Blade)Engine bonnet hinge area leaks hydraulic fluid onto the engine block from a cracked seal p. 22
Inspect the bonnet parts list on page 22 to identify the correct sealing components. Locate the exact 1A P-16.0 O-ring in the exploded view to replace the cracked seal. Cross-reference the diagram to ensure compatibility with your canopy pole assembly and roof mounts.
Manual Section: BonnetFrequently Asked Questions
What are the replacement specifications for Hydraulic hoses?
The manual provides specific part numbers for hydraulic hoses, which serve as replacement specifications. For example, in the HYD.OIL PIPING (TANK~PUMP~VALVE) section, you can find "HOSE" with part number 172171-78500. Another example is "HOSE G608BC078S" with part number 172168-78251 in the HYD.OIL PIPING (VALVE~SWIVEL~SWING) section.
What are the replacement specifications for Seals and O-rings?
Replacement specifications for seals and O-rings are provided through their specific part numbers and descriptions. For instance, in the BOOM CYLINDER section, you can find "SEAL SET, CYL.HEAD" with part number 172141-71890 and "SEAL,DUST 38X50X4" with part number 172168-81270. In the SWIVEL JOINT section, an "O-RING 1A P-75.0" is listed with part number 24311-000750.
How do you fix yanmar B22-2B excavator cab area rattles loudly during operation due to missing frame cover grommets?
Inspect the frame and turning bearing components on page 18 to find the correct replacement hardware. Locate the 16x20x4.5 mm grommet in the parts list. Cross-reference the diagram numbers to order the exact rubber inserts and M12x30 mm bolts needed to secure the covers.
How do you fix travel control pedal feels loose and linkage binds when trying to move forward or reverse?
Check the travel control equipment exploded view on page 14 to identify worn linkage components. Locate the specific 5X45 mm lock pin in the parts list to replace the missing hardware. Review the diagram to ensure you order the correct pedal assembly and shaft bushings.
How will I receive this Yanmar B22-2B, 3TNE78A - B1 Parts Catalog?
Instant PDF download. You get the full 118-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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