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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 |
|---|---|---|
| Frame | 2 | - |
| Counterweight | 4 | - |
| Engine | 6 | - |
| Radiator | 8 | - |
| Radiator Support | 10 | Bolt, Washer, Stay, Hose, Clamp |
| Reserve Tank | 12 | Tank, Clamp, Hose |
| Air Cleaner | 14 | Body, Element, Nut, Valve, Indicator, Band, Hose, Clamp |
| Muffler | 16 | Pipe, Clamp, Bolt, Nut, Plate, Bracket, Band |
| Fuel Pipings | 18 | Tube, Clip, Filter, Bolt, Washer, Nut, Hose, Clamp |
| Fuel Pipings | 20 | Tube, Clip, Filter, Bolt, Washer, Nut, Hose, Clamp |
| Tank (Fuel & Oil) | 22 | Filter, Cap, Valve, Plug, Suction Filter, Elbow, Pipe, Adapter |
| Pump Device | 24 | Pump, Bolt, Washer, Cover, Nut, Coupling, Seal, Plug |
| Swing Device | 26 | Oil Motor, Bolt, Washer |
| Swing Post | 28 | Pin, Bolt, Nut, Shim, Washer, Swing Cylinder, Elbow, Clamp |
| Oil Cooler Pipings (1) | 30 | Clamp, Hose, Elbow, Adapter, Washer, Bolt, Pipe |
| Oil Cooler Pipings (2) | 32 | Elbow, Hose, Washer, Clamp, Valve, Adapter, Pipe, Housing |
| Oil Cooler Pipings (3) | 34 | Clamp, Hose, Adapter, O-Ring |
| Oil Cooler Pipings (4) | 36 | Tee, O-Ring, Hose, Elbow, Valve, Bolt, Washer |
| Oil Cooler Pipings (5) | 38 | Adapter, O-Ring, Hose, Elbow, Tee |
| Main Pipings (1) | 40 | Adapter, O-Ring, Elbow, Hose |
| Main Pipings (2) | 42 | Elbow, O-Ring, Adapter, Pipe, Bolt, Washer, Nut, Hose |
| Main Pipings (3) | 44 | Adapter, O-Ring, Hose |
| Main Pipings (4) | 46 | Adapter, O-Ring, Elbow, Hose |
| Main Pipings (5) | 48 | Hose, Adapter, O-Ring |
| Engine Control | 50 | Lever, Plate, Spring, Friction Plate, Ball Joint, Control Cable |
| Control Lever (R) | 52 | Cover, Plate, Seal Cap, Pilot Valve, Elbow, Grip, Lever, Boot |
| Control Lever (L) | 54 | Cover, Plate, Clip, Pilot Valve, Elbow, Grip, Lever, Boot |
| Control Lever (Travel) | 56 | Grip, Lever, Pin, Bearing Unit, Boot, Pedal, Plate |
| Control Lever (Blade) | 58 | Lever, Collar, Bushing, Grip, Bolt, Washer |
| Control Pedal (Boom Swing) | 60 | Link, Spring, Pin, Ring, Pedal, Bracket, Arm, Bolt |
| Control Pedal (Boom Swing) | 62 | Link, Spring, Pin, Ring, Pedal, Bracket, Arm, Bolt |
| Lever Lock (R) | 64 | Lever, Cam, Shaft, Spring, Bushing, Grip, Cable, Rod |
| Lever Lock (L) | 66 | Cam, Shaft, Control Cable, Rod End, Spring |
| Swing Lock | 68 | Lock Pin, Lock Bar, Grip, Stand, Cover |
| Lever Link Support | 70 | Bracket, Plate, Shim, Link, Bearing Unit, Pin |
| Lever Link (Travel) | 72 | Rod, Link, Pin, Bearing Unit, Ball Joint, Washer |
| Lever Link (Blade) | 74 | Rod, Link, Ring, Pin, Nut, Washer, Spring, Bushing |
| Lever Link (Blade) | 76 | Pin, Lock, Nut, Washer, Spring, Joint, Ball, Cable |
| Lever Link (Boom Swing) | 78 | Rod, Link, Bushing, Pin, Lock, Nut, Washer, Spring |
| Pilot Pipings (1-1) | 80 | Tee, O-Ring, Plug, Hose, Adapter, Filter, Oil, Element |
| Pilot Pipings (1-2) | 82 | Valve Solenoid, Hose, Elbow, O-Ring, Bolt Sems |
| Pilot Pipings (1-3) | 84 | Hose, Elbow, Adapter, Valve Lock, Bracket, Bolt, Washer Spring, Stopper |
| Pilot Pipings (1-4) | 86 | Hose, Elbow, Adapter, O-Ring |
| Pilot Pipings (2-1) | 88 | Hose, Tee, O-Ring, Adapter, Clamp, Clip Band |
| Pilot Pipings (2-2) | 90 | Hose, Tee, Elbow, O-Ring |
| Pilot Pipings (2-2) | 92 | Hose, Adapter, Elbow, O-Ring, Nut, Washer, Bracket, Bolt |
| Lubricate Pipings (Upperstructure) | 94 | Fitting, Adapter, Hose |
| Console (R) _Canopy_ | 96 | Stand, Cover, Bolt, Bracket, Hinge, Pin, Bearing, Screw |
| Console (R) _Cab_ | 98 | Stand, Cover, Bolt, Bracket, Hinge, Bearing, Needle, Screw |
| Console (L) _Canopy_ | 100 | Stand, Cover, Bolt, Bracket, Hinge, Bearing, Needle, Screw |
| Console (L) _Cab_ | 102 | Stand, Cover, Bolt, Bracket, Hinge, Bearing, Needle, Screw |
| Gauge Panel _Canopy_ | 104 | Panel, Meter, Housing, Grommet, Cap, Board, Switch, Case |
| Gauge Panel _Canopy, Cab_ | 106 | Gauge Panel, Meter, Control Board, Switch, Harness, Diode |
| Electric Parts (1) | 108 | Buzzer, Relay, Timer, Fuse Box, Fuse, Unit Timer |
| Electric Parts (2) | 110 | Monitor, Bracket, Cover |
| Electric Parts (3) | 112 | Rubber Sheet, Bracket, Battery |
| Electric Parts (4) | 114 | Start Switch, Battery Relay, Safety Relay, Hour Meter, Head Lamp, Fuse Link |
| Electric Parts (5) | 116 | Fuel Pump, Thermo Switch, Thermo Unit, Stop Solenoid, Pressure Switch |
| Wire Harness | 118 | Battery Cable, Diode Unit, Band Clip |
| Wire Harness | 120 | Starter Switch Harness, Hour Meter Harness, Boom Light Harness |
| Canopy | 122 | Seal, Pawl, Bolt, Washer, Roof, Cushion, Stay, Guard |
| Floor | 124 | Plate, Bolt, Cover, Cushion, Shim, Mat, Lock, Bushing |
| Floor | 126 | Plate, Bolt, Cover, Cushion, Shim, Mat, Lock, Bushing |
| Seat | 128 | Base, Bolt, Washer, Nut, Bracket, Rubber, Plate, Arm Rest |
| Cover (1) | 130 | Support, Stay, Spring, Stopper, Washer, Hook, Seal |
| Cover (2) | 132 | Bolt, Bushing, Rubber, Glasswool |
| Cover (3) | 134 | Rubber, Glasswool |
| Cover (4) | 136 | Washer, Cushion, Plate, Bolt, Rubber, Glasswool |
| Cover (5) | 138 | Rubber, Plate, Cushion |
| Track Frame | 140 | Frame, Swing Circle Bearing, Seal, Bolt, Plug, Guide |
| Travel Device | 142 | Assembly, Oil Motor, Sprocket, Socket Bolt, Spring Washer |
| Front Idler | 144 | Assembly, Idler, Bushing, Axle, O-Ring, Seal Group, Yoke, Spring Pin |
| Adjuster (Steel Crawler) | 146 | Cylinder Assembly, Piston Rod, Spring, Seal, Plug, Name Plate |
| Lower Roller | 148 | Roller Assembly, Collar, Axle, Stopper Ring, Seal Group, Plug |
| Track-Link 250G (Steel Crawler) | 150 | Track-Link Assembly, Link Shoe, Bushing, Track Pin, Master Pin |
| Crawler Guide (Steel Crawler) | 152 | Guide, Bolt, Spring Washer, Washer |
| Center Joint | 154 | Spindle, Plug, Seal, Body, O-Ring, Ring, Cover |
| Travel Pipings | 156 | Adapter, O-Ring, Elbow, Tee, Hose, Cover, Clip |
| Travel Pipings Cover | 158 | Cover, Bolt, Washer, Spring, Plane |
| Blade | 160 | Bushing, Seal, Pin, Fitting, Bolt, Nut |
| Blade Pipings | 162 | Cylinder, Adapter, Hose, Bushing |
| Boom | 164 | Assembly, Bushing, Seal, Pin, Shim, Bolt, Nut |
| Std. Arm 1 | 166 | Arm Assembly, Bushing, Seal, Link Assembly, Pin, Shim, Bolt, Nut |
| Bucket 0.06 (460Mm Wide) | 168 | Bucket Assembly, Tooth, Cutter, Boss, Shim, Plate, Bolt, Nut |
| Front Pipings | 170 | Boom Cylinder, Bucket Cylinder, Pipe, Clamp, Cover, Hose |
| Multi Lever | 172 | Rotary Valve, Bracket, Cover, Plate, Bolt, Washer |
| Multi Lever Pipings (1) | 174 | Rotary Valve, Hose, Elbow, O-Ring |
| Multi Lever Pipings (2) | 176 | Rotary Valve, Hose, Elbow, O-Ring |
| Multi Lever Pipings (3) | 178 | - |
| Multi Lever Pipings (4) | 180 | - |
| Car Heater | 182 | - |
| Defroster | 184 | - |
| Cab Ass'Y | 186 | Cab Assembly |
| Cab (1) | 188 | Cover, Bolt, Washer, Rubber, Spacer |
| Cab (2) | 190 | Window Assembly, Front-Glass Assembly, Frame, Weather-Strip, Roller, Shim, Lock, Lever |
| Cab (3) | 192 | Glass, Rubber, Bracket, Seal, Screw, Nut, Washer, Spacer |
| Cab (4) | 194 | Door Assembly, Glass, Weather-Strip, Door Lock, Door Handle |
| Cab (5) | 196 | Ratch, Shim, Bracket, Lock, Stopper, Handle |
| Cab (6) | 198 | Glass, Weather-Strip, Cover, Stopper, Handrail, Striker |
| Cab (7) | 200 | Window Assembly, Frame, Glass-Run, Weather-Strip, Lock, Spacer |
| Cab (8) | 202 | Harness, Connector, Terminal, Antenna, Tube, Lamp, Screw, Box |
| Cab (9) _Window Washer_ | 204 | Window-Washer, Bracket, Grommet, Bushing, Screw, Hose |
| Radio (Cab) | 206 | Harness |
| Engine Cover Guard | 208 | Protector, Bolt, Washer |
| Track-Link 300G (Steel Crawler) | 210 | Track-Link Ass'y, Link, Shoe, Bushing, Pin, Track Pin, Master Pin |
| Track-Link 400A (Steel Crawler) | 212 | Track-Link Ass'y, Link, Shoe, Bushing, Pin, Master Pin |
| Rubber Crawler | 214 | Shoe Ass'y |
| Adjuster (Rubber Crawler) | 216 | Ass'y, Cylinder, Rod, Spring, Washer, Nut, Plug, Wear Ring |
| Long Blade | 218 | Blade, Bushing, Seal, Pin, Fitting, Bolt, Nut |
| Long Arm 1 | 220 | Arm, Bushing, Seal, Link, Pin, Shim, Bolt, Nut |
| Bucket 0.035 (300Mm Wide) | 222 | Bucket, Tooth, Cutter, Nut, Boss, Shim, Plate, Bolt |
| Bucket 0.042 (350Mm Wide) | 224 | Bucket, Tooth, Cutter, Nut, Boss, Shim, Plate, Bolt |
| Bucket 0.075 (550Mm Wide) | 226 | Bucket, Tooth, Side Cutter, Boss, Shim, Plate |
| Spare Pedal | 228 | Pin, Rod, Nut, Joint, Bushing, Pedal |
| Engine Control (Extra Pipings) | 230 | Cover, Bracket, Pipe, Guide, Pin, Name-Plate |
| Extra Pipings (Upperstructure) | 232 | Valve, Bolt, Name-Plate, Clip, Elbow, Hose |
| Extra Pipings (Front) _Std | 234 | Pipe, Clamp, Hose, Valve, Adapter, Bolt, Washer |
| Extra Pipings (Front) _Long Arm_ | 236 | Pipe, Clamp, Hose, Valve, Adapter, Bolt, Washer |
| Extra Pipings (Front _Hydraulic Ports) | 238 | Elbow, Adapter, Plug, Bolt, Seat Screw |
| Tool | 240 | Spanner, Wrench, Screwdriver, Plier, Grease Gun, Bag |
| Name-Plate (Japanese) | 242 | Rivet, Tape, Caution Plate |
| Pump;Gear | 244 | Cover, Body, Gear, Plate, Bushing, Gasket, Ball, Seal |
| Motor;Oil (1_3) | 246 | Case, Shaft, Pinion, Bearing, Seal, Shim, Holder, Gear |
| Motor;Oil (2_3) | 248 | Case, Cylinder Block, Shaft, Valve Plate, Piston, Bearing, Collar, Spring |
| Motor;Oil (3_3) | 250 | Base, Plunger Assembly, Plunger, Valve Check, Spring, Plug, O-Ring, Seat Spring |
| Motor;Oil (1_3) | 252 | Shaft, Ball, Seal, Plate, Ball Steel, Block Cylinder, Washer, Spring |
| Motor;Oil (2_3) | 254 | Holder, Seal, Bearing, Nut, Plug, Housing, Ball Steel, Gear Planetary |
| Motor;Oil (3_3) | 256 | Base, Plunger Assembly, Plunger, Valve Check, Spring, Plug, O-Ring, Seat Spring |
| Motor;Oil (1_3) | 258 | Motor Shaft, Ball Bag, Oil Seal, Motor Plate, Cylinder Block, Motor Spring |
| Motor;Oil (2_3) | 260 | Motor Holder, Motor Seal, Motor Bearing, Motor Nut, Motor Plug, Planetary Gear |
| Motor;Oil (3_3) | 262 | Valve Base, Plunger Assembly, Check Valve, Spring, Spool, Relief Valve Block |
| Valve;Control (1_4) | 264 | Valve Plate, Valve Housing, Spool, Oil Seal, Check Valve, Socket Bolt |
| Valve;Control (2_4) | 266 | Housing, Valve Check, Spring, O-Ring, Spool, Seal Oil, Plate, Seat Spring |
| Valve;Control (3_4) | 268 | Housing, Plate, Valve Check, Spring, O-Ring, Spool, Seal Oil, Bolt Socket |
| Valve;Control (4_4) | 270 | Plate, Housing, Spool, Seal Oil, Bolt Socket, O-Ring, Cap, Valve Check |
| Valve;Pilot | 272 | Casing Assy, Casing, Spool, Spring Compress, Spacer, Shim, Guide Spring, Pusher Assy |
| Valve;Solenoid | 274 | Valve Solenoid, Housing, Relief Valve, Spool, Plunger, Spring, Plunger Seat |
| Cyl.;Boom (Canopy) | 276 | Cylinder Boom, Tube, Piston Rod, Cylinder Head, Bushing, Wiper Ring, Seal Group, Piston |
| Cyl.;Boom (Cab) | 278 | Cylinder Boom, Tube, Piston Rod, Cylinder Head, Bushing, Wiper Ring, Seal Group, Piston |
| Cyl | 280 | Cylinder Arm, Tube, Piston Rod, Cylinder Head, Bushing, Wiper Ring, Seal Group, Piston |
| Cyl.;Bucket | 282 | Tube, Cylinder Assembly, Head, Piston, Seal, Ring |
| Cyl | 284 | Tube, Cylinder Assembly, Head, Piston, Seal, Ring |
| Cyl | 286 | Tube, Cylinder Assembly, Head, Piston, Seal, Ring |
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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