![Hitachi EX12 Illustrated Parts List Manual [Excavator]](https://youfixthis.com/wp-content/uploads/2019/12/D0A1D0BAD180D0B8D0BDD188D0BED182-2015-02-02-11.24.27-300x300.png)
Part of the Hitachi Parts Manuals.
Need the right part number for your Hitachi EX12-2 excavator? This 309-page Hitachi EX12-2 parts catalog PDF (OEM #P1A4-1-2) covers the whole machine, counterweight to bucket cylinder. Every assembly gets an exploded view paired with its numbered parts list: engine mounts, pump device, swing device, travel motors, pilot pipings, cab glass, and the full undercarriage (front idlers, lower rollers, adjusters, track links). You also get an equipment components section that breaks the gear pump, oil motors, control valve sections, and boom, arm, and bucket cylinders down to individual seals and O-rings. Ordering bucket teeth? Four bucket widths from 250 mm to 450 mm are broken out in bolt-type and pin-type versions, plus steel and rubber crawler variants. Stop squinting at blurry photos over the parts counter. Bookmarked with a live text layer; type the part name, jump to the diagram, order once.
What's Inside This Hitachi EX12-2 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Air Cleaner, Fuel Pipings, Fuel Tank | |
| Cooling System | Radiator, Radiator Support, Reserve Tank | |
| Engine | Muffler, Engine Control, Lubricate Pipings, Swing Bearing | |
| Electrical System | Gauge Panel, Wire Harness | |
| PTO | Extra Pipings _PTO_ | |
| Hydraulics & 3-Point Hitch | Pump Device, Boom Swing Cylinder, Blade Cylinder, Boom Cylinder, Arm Cylinder, Bucket Cylinder, Pump;Gear, Valve;Control, Valve;Pilot, Valve;Relief, Valve;Lock | |
| Loader, Backhoe & Attachments | Swing Device, Swing Post, Boom, Boom Support, Bucket 0.022 _Jis94__Bolt Type_, Bucket 0.022 _Jis94__Pin Type_, Bucket 0.035 _Jis94__Bolt Type_, Bucket 0.035 _Jis94__Pin Type_, Bucket 0.04 _Jis94__Bolt Type_, Bucket 0.04 _Jis94__Pin Type_, Bucket 0.044 _Jis94__Bolt Type_, Bucket 0.044 _Jis94__Pin Type_, Attachment Pedal, Cyl.;Boom, Cyl.;Bucket | |
| Body & Operator Station | Oil Tank, Console _Canopy_, Console _Cab_, Canopy, Floor, Seat, Seat Base, Cover, Track Frame, Cab, Cab Ass'Y, Cab Support | |
| Decals & Accessories | Tools | |
| Other Components | Counterweight, Protector, Low Pressure Pipings, Main Pipings, Console, Control Lever, Control Pedal, Lever Link, Pilot Pipings, Pilot Pipings _Jis-Type_, Pilot Pipings _H-Type_, Electric Parts, Bolt Kit, Travel Device, Front Idler, Adjuster |
Hitachi EX12-2 Common Problems This Manual Covers
Hitachi EX12-2 bucket teeth worn out, can't match bolt-on or pin-lock tooth part numbers
Measure the bucket cutting width first: the catalog splits listings into 250 mm, 350 mm, 410 mm, and 450 mm buckets. Check the bolt-type exploded view on page 188 or the pin-type view on page 190 for the 250 mm bucket, then match tooth, pin lock, and side cutter item numbers to your serial range.
Manual Section: Bucket 0.022 _Jis94_(250Mm Wide)_Bolt Type_ p. 188Boom cylinder weeping at the rod seal, no idea which packing kit fits
Verify your machine configuration before ordering anything: canopy machines take the boom cylinder breakdown on page 300, cab machines the version on page 302. Measure the rod diameter in millimeters, then match the exploded view callouts for piston rod, cylinder head, bushing, packing, and back-up ring against the parts list.
Manual Section: Cyl.;Boom (Canopy) p. 300Rubber tracks cracked and stretched, unsure which crawler assembly or adjuster parts to order
Check the rubber crawler shoe assembly on page 163 for the complete track listing, and measure your shoe width in millimeters before ordering. Steel track machines use the Track-Link 230G assembly on page 159 instead, broken into link, shoe, bushing, and pin. Order adjuster wear parts from page 153: cylinder assembly, spring, wear ring, and seal.
Manual Section: Rubber Crawler p. 163Service filters due, three different hydraulic filters listed and part numbers don't match old stock
Check the oil tank breakdown on page 33: the suction filter and return filter are listed as separate items alongside the level gauge and breather cap. Find the pilot line filter with its bracket on page 85, and compare element length in millimeters against your removed filter. Engine oil filter numbers sit in the engine group on page 7.
Manual Section: Oil Tank p. 33Gear pump coupling and oil seal identification after pump removal, exploded view needed
Check the pump device mounting group on page 25 for the coupling, oil seal, and plug callouts. Find the internal gear pump breakdown on page 272: cover, body, gear, plate, bushing, and gasket each carry their own item number. Measure the shaft seal bore in millimeters and confirm fit against your serial number range.
Manual Section: Pump Device p. 25Frequently Asked Questions
What are the replacement specifications for hydraulic filters?
The suction filter for the hydraulic system is part number 4272367, and the return filter is part number 4272371, which includes the cartridge (part number 4294128). p. 33
What are the replacement specifications for engine oil filters?
The engine oil filter for the EX12-2 is part number 4294838. p. 7
What is the part number for the fan belt on the engine?
The fan belt for the engine is part number 4352387. p. 7
What is the part number for the fuel filter?
The fuel filter for the engine is part number 4340285 (or 4366411 for later serial numbers), and the filter element is part number 4366662. p. 19
What is the part number for the air cleaner element?
The air cleaner element for the EX12-2 is part number 4357442. p. 15
What format is this Hitachi EX12-2 manual in?
Immediate download of the complete 309-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Hitachi EX12-2 Parts Catalog printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
