Part of the Hitachi Parts Manuals.
Looking for a Hitachi EX8-2B parts catalog PDF straight from the factory? All 161 pages of this OEM catalog (#P1AG-1-2) map the EX8-2B mini excavator part by part, from counterweight bolts to bucket teeth. You get exploded views matched to factory part numbers for the frame, engine mounts, radiator, fuel tank, gear pump, swing device, and the complete boom, arm, and bucket cylinder groups. Piping pages split rigid and expansional frame versions, so you order the right hose, adapter, or O-ring on the first call. Need a side cutter or tooth for the 250, 300, or 350 mm JIS bucket? Each size gets its own breakdown. Guessing part numbers over the phone gets you the wrong box in a week. This bookmarked PDF opens on any device; jump to the section, read your dealer the exact number, and get back to digging.
What's Inside This Hitachi EX8-2B Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Frame | 2 | Bushing, Dust Seal, Counterweight, Bolt, Spring Washer, Washer, Knock Pin |
| Engine | 4 | Rubber Cushion, Nut, Spring Washer, Washer, Bracket, Bolt, Sems Bolt, Hose Clamp |
| Radiator | 6 | Water Hose, Clamp, Rubber, Bolt, Spring Washer, Plane Washer, Drain Cock, O-Ring |
| Air Cleaner | 8 | Nut, Bracket, Sems Bolt, Hose Band, Hose Clamp, Rubber Hose, Bolt, Plane Washer |
| Muffler | 10 | Bracket, Clamp, Bolt, Washer, Gasket |
| Fuel Tank | 12 | Filter, Cushion, Cap Assembly, Hose, Clamp |
| Pump Device | 14 | Gear Pump, Pump Cover, Rubber Coupling, Bolt |
| Swing Device | 16 | Oil Motor, Bolt, Washer |
| Swing Post | 18 | Swingpost, Pin, Bolt, Nut, Shim, Plate |
| Boom Swig Cylinder | 20 | Swing Cylinder, Bushing, Dust Seal |
| Oil Tank | 22 | Suction Filter, Return Filter, Level Gauge, Hose, Bracket |
| Low Pressure Piping | 24 | Clip, Elbow, Rubber Hose, Adapter, O-Ring, Plastic Hose |
| Main Piping (1) _Rigid Frame_ | 26 | Adapter, O-Ring, Control Valve, Bolt |
| Main Piping (2) _Rigid Frame_ | 28 | Adapter, O-Ring, Hose |
| Main Piping (3) _Rigid Frame_ | 30 | Adapter, O-Ring, Hose, Clip |
| Main Piping (4) _Rigid Frame_ | 32 | Adapter, O-Ring, Hose, Protector |
| Main Piping (1) _Expansional Frame_ | 34 | Adapter, Valve, Bolt, Hose, Protector |
| Main Piping (2) _Expansional Frame_ | 36 | Adapter, Hose, O-Ring |
| Main Piping (3) _Expansional Frame_ | 38 | Adapter, Elbow, Hose, Clip |
| Main Piping (4) _Expansional Frame_ | 40 | Adapter, Hose, Protector |
| Lubricate Piping (Upperstructure) | 42 | Fitting, Hose, Cap, Name-Plate |
| Engine Control | 44 | Lever, Grip, Bushing, Arm, Cable, Pin, Spring, Bracket |
| Control Lever (1-1) | 46 | Stand, Bolt, Pin, Lever, Bushing, Plate, Grip, Boot |
| Control Lever (1-2) | 48 | Shaft, Grip, Bolt, Link, Pin, Spring, Plate, Shim |
| Control Lever (2) | 50 | Lever, Bushing, Shaft, Link, Nut, Pin, Grip, Rubber |
| Control Lever (3) _Expansional Frame_ | 52 | Link, Cap, Rod, Pin, Bushing, Shim |
| Stay | 54 | Bolt |
| Swing Lock | 56 | Cap, Lever, Link, Bushing, Pin, Stay, Bolt, Washer |
| Electric Parts (1) | 58 | Battery, Plate, Holder, Nut, Washer |
| Electric Parts (2) | 60 | Relay, Timer, Bolt, Regulator |
| Electric Parts (3) | 62 | Pump, Screw, Switch, Fusible-Link, Solenoid, Meter, Lamp |
| Electric Parts (4) | 64 | Horn, Bolt, Lamp, Lens, Bulb, Stay, Nut, Harness |
| Wire Harness | 66 | Harness, Cable, Clamp, Nut, Washer, Fuse |
| Electrical Socket [Eu] | 68 | Socket, Harness |
| Canopy | 70 | Frame, Cover, Rubber, Cushion, Bolt |
| Seat | 72 | Rubber Cushion, Nut, Washer |
| Seat Base [Eu] | 74 | Base, Plate, Cover, Bolt, Nut, Washer |
| Cover (1) | 76 | Bracket, Rubber, Mat, Cushion, Bolt |
| Cover (2) | 78 | Lock Cylinder, Rubber, Cushion, Shim, Catch |
| Track Frame (Rigid Frame) | 80 | Cover, Bolt, Washer, Plate |
| Track Frame (Expansional Frame) | 82 | - |
| Travel Device | 84 | - |
| Swing Bearing | 86 | - |
| Bolt Kit | 88 | - |
| Front Idler | 90 | Idler Assembly, Axle, Ball Bearing, Seal, Yoke, Retaining Ring |
| Lower Roller | 92 | Assembly, Roller, Shaft, Ball Bearing, Retaining Ring, Seal |
| Rubber Crawler | 94 | Shoe Assembly |
| Travel Piping (Rigid Frame) | 96 | Elbow, O-Ring, Adapter, Plastic Hose, Center Joint, Bolt |
| Travel Piping (Expansional Frame) | 98 | Adapter, O-Ring, Hose, Elbow, Pin, Plate, Bolt |
| Span Cylinder | 100 | Cylinder |
| Blade (Rigid Frame) | 102 | Bushing, Seal |
| Blade (Expansional Frame) | 104 | Bushing, Seal, Bracket, Pin |
| Blade Parts | 105 | Bolt, Washer, Pin, Plate, Cover |
| Blade Piping (Rigid Frame) | 109 | Elbow, O-Ring, Hose |
| Blade Piping (Expansional Frame) | 111 | Elbow, O-Ring, Hose |
| Blade Cylinder | 113 | Cylinder, Bushing, Dust Seal |
| Boom | 115 | Bushing, Seal |
| Boom Support | 117 | Pin, Plate, Bolt, Shim |
| Std. Arm 0 | 119 | Arm, Bushing, Seal |
| Std. Arm Support | 121 | Link, Bushing, Seal, Pin, Bolt, Plate, Shim, Grease Fitting |
| Long Arm 0 | 123 | Arm, Bushing, Seal |
| Long Arm Support | 125 | Link, Pin, Plate, Bolt, Shim, Grease Fitting, Hose, Clip |
| Front Piping | 127 | Hose, Protector, Cover, Rubber, Bolt, Clamp, Plate |
| Boom Cylinder | 129 | Cylinder, Bushing, Seal |
| Arm Cylinder | 131 | Cylinder, Bushing, Dust Seal |
| Bucket Cylinder | 133 | Cylinder, Bushing, Dust Seal |
| Bucket 0.016 _Jis94_ (250Mm Wide) | 135 | Bucket, Side Cutter, Tooth |
| Bucket 0.02 _Jis94_ (300Mm Wide) | 137 | Bucket, Side Cutter, Tooth |
| Bucket 0.022 _Jis94_ (350Mm Wide) | 139 | Bucket, Side Cutter, Tooth |
| Front Piping Protector [Eu] | 141 | Vinyl Hose |
| Attachment Pedal | 143 | Pedal, Bushing, Shaft, Pin, Spring, Link, Bolt, Nut |
| Extra Piping (Upperstructure) | 145 | Bolt, Bracket, Plastic Hose |
| Extra Piping (Front) _Std. Arm_ [Std] | 147 | Elbow, Pipe, Bolt, Clip, Hose, Bushing, Clamp, Adapter |
| Extra Piping (Front) _Long Arm_ [Std] | 149 | Elbow, Pipe, Bolt, Clip, Hose, Bushing, Clamp, Adapter |
| Extra Piping (Front) _Std. Arm, Long Arm_ [Eu] | 151 | Elbow, Pipe, Bolt, Clip, Hose, Bushing, Clamp, Adapter |
| Extra Piping (PTO) | 153 | Bolt, Bracket, Plug, O-Ring, Hose, Adapter |
| Tools (Domestic) | 155 | Spanner, Wrench, Screwdriver, Plier, Grease Gun, Cartridge |
| Tools (Export) | 157 | Spanner, Wrench, Screwdriver, Plier, Grease Gun, Cartridge |
| Name-Plate (Japanese) | 159 | Lever Lock, Fuel Plate, Hydraulic Oil Plate, Inspection Plate, Lubrication Plate, Swing Lock Plate |
| Name-Plate (English) [Eu] | 161 | Lever Lock, Fuel Plate, Hydraulic Oil Plate, Lubrication Plate, Emergency Stop Plate, Lifting Position Plate |
Hitachi EX8-2B Common Problems This Manual Covers
Hitachi EX8-2B swing device O-rings hardened like rock, need correct replacement seal part numbers
Check the swing device parts list on page 16, keyed to the exploded view on page 15. Order every O-ring shown for the oil motor at once; hardened seals almost never fail one at a time. While the motor is apart, measure shoe-to-piston play: over 2 mm means you add the piston and shoe components to the order.
Manual Section: Swing Device p. 16Bucket teeth and side cutter part numbers differ between the three bucket sizes
Measure the bucket cutting width before you order anything. Match a 250 mm bucket to the parts list on page 135, a 300 mm bucket to page 137, and a 350 mm bucket to page 139. Each page carries its own bucket, side cutter, and tooth numbers; wear parts do not interchange between sizes.
Manual Section: Bucket 0.02 _Jis94_ (300Mm Wide) p. 137Main piping hoses and O-rings look identical between rigid and expansional frame machines
Verify which frame your machine has before pulling numbers; compare your undercarriage against the track frame listings on page 80 for rigid and page 82 for expansional. Rigid frame main piping runs on pages 26 through 32, expansional frame on pages 34 through 40. Order hoses, adapters, and O-rings only from your frame's set.
Manual Section: Main Piping (1) _Rigid Frame_ p. 26Control levers feel sloppy and worn, unsure which bushings, pins, and shims to order
Inspect each lever pivot for play, then work through the parts lists in order: page 46 covers the stand, lever, and bushings, page 48 the shaft, link, and shims, and page 50 the second lever group. Expansional frame machines add the link and rod parts on page 52. Order bushings and pins as matched pairs.
Manual Section: Control Lever (1-1) p. 46Frequently Asked Questions
What is the part number for the main hydraulic pump on the EX8-2B?
The main gear pump for the excavator is part number 4388267. This component is listed in the Pump Device section on page 14. p. 14
What is the part number for the main fuel filter element?
The main fuel filter element is part number 4376645 for serial numbers up to 003321, and part number 4413286 for serial numbers 003322 and above. These are listed in the Fuel Tank section on page 12. p. 12
What is the part number for the radiator assembly?
The radiator assembly part number is 4388407 for units up to serial number 003483, and 4414285 for units with serial number 003484 and above. These details are found in the Radiator section on page 6. p. 6
What is the part number for the air cleaner assembly?
The air cleaner assembly is part number 4388258. This part is listed in the Air Cleaner section on page 8. p. 8
Is this Hitachi EX8-2B Parts Catalog a digital download?
You get a 161-page scanned PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Are there any print restrictions on this Hitachi EX8-2B 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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