Part of the Hitachi Parts Manuals.
All 286 pages of this Hitachi EX22 Parts Catalog PDF (OEM #P1AA-1-5) cover one machine: your EX22 compact excavator, from track frame to bucket pin. You get exploded views with numbered callouts for every assembly, so matching a worn bushing or seal to its exact Hitachi part number takes minutes, not phone calls to the dealer. Inside: full breakdowns of the pump device, swing post, control valves, travel device, cab and canopy hardware, plus every hose, clamp, and O-ring in the pilot and main pipings. It even separates the option parts: steel track-link groups (250G, 300G, 400A), rubber crawler, and buckets from 300mm to 550mm wide. Ordering the wrong seal kit twice gets old fast. Bookmarked by section, so you flip straight to the right exploded view on any tablet or phone in the shop.
What's Inside This Hitachi EX22 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Air Cleaner, Fuel Pipings | |
| Cooling System | Radiator, Radiator Support, Reserve Tank, Oil Cooler Pipings | |
| Engine | Muffler, Engine Control, Lubricate Pipings, Engine Cover Guard | |
| Electrical System | Gauge Panel, Electric Parts, Wire Harness, Solenoid Valve | |
| Undercarriage & Travel | Travel Device, Front Idler, Lower Roller, Crawler Guide, Travel Pipings, Travel Pipings Cover, Rubber Crawler | |
| Hydraulics & 3-Point Hitch | Pump Device, Main Pipings, Pilot Pipings, Blade Pipings, Front Pipings, Multi Lever Pipings, Extra Pipings, Gear Pump, Control Valve, Pilot Valve, Boom Cylinder, Bucket Cylinder | |
| Loader, Backhoe & Attachments | Swing Device, Swing Post, Swing Lock, Blade, Boom, Bucket 0.06, Long Blade, Bucket 0.035, Bucket 0.042, Bucket 0.075 | |
| Body & Operator Station | Frame, Tank, Console, Canopy, Floor, Seat, Track Frame, Car Heater, Cab Ass'Y, Cab, Radio | |
| Decals & Accessories | Tool | |
| Other Components | Counterweight, Control Lever, Control Pedal, Lever Lock, Lever Link Support, Lever Link, Adjuster, Track-Link 250G, Center Joint, Std. Arm 1, Multi Lever, Defroster, Track-Link 300G, Track-Link 400A, Long Arm 1, Spare Pedal |
Hitachi EX22 Common Problems This Manual Covers
Hitachi EX22 travel motor whines and one track stopped driving, need replacement part numbers
Check the Travel Device exploded view on page 142 for the complete oil motor, sprocket, and mounting hardware. Cross-reference the final drive assembly, part 4266830, against your serial number range before ordering. If you only need internal pieces (pistons, bearings, planetary gears, seals), those break out across pages 246 through 250.
Manual Section: Travel Device p. 142Not sure which bucket parts list matches my machine when ordering teeth and side cutters
Measure your bucket width at the cutting edge first. The 0.06 capacity 460 mm bucket is listed on page 168, the 0.035 (300 mm) on page 222, the 0.042 (350 mm) on page 224, and the 0.075 (550 mm) on page 226. Order tooth, cutter, boss, and shim hardware only from the list matching that width.
Manual Section: Bucket 0.06 (460Mm Wide) p. 168Boom cylinder weeping oil at the rod, can't find the correct seal group part number
Verify whether your machine is canopy or cab spec before ordering anything; the boom cylinder breaks down on page 276 for canopy units and page 278 for cab units. Match the seal group, wiper ring, and bushing line items to your serial range. Arm cylinder seals sit on page 280, bucket cylinder seals on page 282.
Manual Section: Cyl.;Boom (Canopy) p. 276Control valve leaking between sections, unsure which spool seals and O-rings to order
Inspect the control valve breakdown across pages 264 through 270; the assembly splits into 4 sections covering housings, spools, check valves, and oil seals. Work the exploded view section by section until you match your leaking spool, then pull its O-ring and oil seal numbers. Pilot valve springs, pushers, and shims are listed separately on page 272.
Manual Section: Valve;Control (1_4) p. 264Steel tracks stretched and worn, can't tell which track-link assembly and adjuster parts fit
Check your shoe pattern stamped on the link before ordering: Track-Link 250G is on page 150, 300G on page 210, and 400A on page 212. Rubber crawler shoe assemblies are on page 214. Pull adjuster cylinder seals, springs, and wear rings from page 146 for steel crawlers or page 216 for rubber crawlers.
Manual Section: Track-Link 250G (Steel Crawler) p. 150Frequently Asked Questions
What are the replacement specifications for the final drive assembly?
The final drive assembly (part number 4266830) is listed as a complete motor assembly. For detailed component-level replacement parts, refer to the 'MOTOR;OIL' sections starting on page 246, which provide exploded views and part numbers for internal components like gears, bearings, and seals. p. 142
What is the replacement part number for the hydraulic pump?
The gear pump assembly is identified by part number 4266814. Detailed component parts for this pump are listed in the 'PUMP;GEAR' section on page 244. p. 24
What is the correct fuse rating for the 5A circuit in the electric system?
The fuse box (part number 4281142) contains a 5A fuse, which is identified by part number 4164129. p. 108
What is the part number for the standard bucket tooth?
The standard bucket tooth is identified by part number 3056107. This part is used across multiple bucket sizes, including the 0.06, 0.035, and 0.075 capacity buckets. p. 168
What is the replacement part number for the boom cylinder on a canopy-equipped machine?
The boom cylinder for a canopy-equipped machine is part number 4270521. Detailed seal kits for this cylinder are available under part number 4293345. p. 170
How will I receive this Hitachi EX22 Parts Catalog?
Immediate download of the complete 286-page scanned Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Hitachi EX22 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.
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