Part of the Hitachi Parts Manuals.
Wrenching on an EX50UR and need the right part number on the first try? This Hitachi EX50UR parts catalog PDF (OEM #P10E-1-5) packs 201 pages of factory exploded views covering the whole excavator, from the swing device, pump device, and oil tank to the offset boom, blade, and rubber crawler undercarriage. You get numbered exploded diagrams matched to complete parts lists: every pin, bushing, seal group, and O-ring called out with its genuine Hitachi part number. Component breakdowns go deep; the piston pump rotary group, travel motor, control valve spools, and each cylinder (boom, arm, bucket, offset, blade) has its own illustrated view. Cross-reference Japan and export versions of the air cleaner and piston pump before you order. No more squinting at a worn casting while the parts counter guesses. Bookmarked and searchable; type a component name and jump straight to its diagram.
What's Inside This Hitachi EX50UR Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Frame | 2 | Counterweight, Pin, Ring, Bushing, Rubber |
| Engine | 4 | Fan Belt, Oil Filter, Fuel Filter, Water Hose, Bracket |
| Radiator | 6 | Assembly, Core, Oil Cooler, Fan Guide, Drain Plug, Packing |
| Reserve Tank | 8 | Water Tank, Water Hose, Vinyl Hose, Hose Clamp, Bracket, Rubber |
| Air Cleaner (for Japan) | 10 | Assembly, Body, Element, Packing, Nut, Valve, Indicator, Bracket |
| Air Cleaner (for Export) | 12 | Assembly, Body, Element, Nut, Valve, Indicator, Bracket, Hose |
| Muffler | 14 | Bracket, Pipe, Packing, Nut, Clamp, Bolt, Washer |
| Fuel Pipings | 16 | Clip, Hose, Bolt, Washer, Tube |
| Fuel Tank | 18 | Filter, Cap, Packing, Gauge, Washer, Pipe, Tank, Bolt |
| Pump Device | 20 | Pump, Cover, Bolt, Washer, Coupling, Pin, Seal, Plug |
| Swing Device | 22 | Motor, Bolt, Washer, Hose, Adapter, Plug |
| Oil Tank | 24 | Bolt, Washer, Tank, Element, Valve, Spring, O-Ring, Cover |
| Oil Cooler Pipings (1) | 26 | Radiator Assembly, Oil Cooler, Fan Guide, Hose, Elbow, Adapter |
| Oil Cooler Pipings (2) | 28 | Control Valve, Pipe, Hose, Clamp, Coupling, Valve |
| Oil Cooler Pipings (3) | 30 | Adapter, Hose, Elbow, Protector, Clip, O-Ring |
| Main Pipings (1) | 32 | Pipe, Hose, Adapter, Clamp, Elbow, O-Ring |
| Main Pipings (2) | 34 | Hose, Clamp, Pipe, Bolt, Washer, Nut |
| Main Pipings (3) | 36 | Hose, Adapter, O-Ring, Clip, Protector |
| Main Pipings (4) | 38 | Valve, Hose, Bolt, Adapter, Clip |
| Engine Control Lever (1) | 40 | Lever, Plate, Link, Brake Shoe, Brake Cam, Button, Turnbuckle, Chain |
| Engine Control Lever (2) | 42 | Control Cable, Ball Joint, Nut, Spring Washer, Plane Washer |
| Auto Idle Lever | 44 | Lever, Bushing, Pin, Plane Washer, Retaining Ring, Adjuster, Nut, Tension Spring |
| Control Lever (1) | 46 | Stand, Bolt, Pilot Valve, Lever, Grip, Nut, Cover, Screw |
| Control Lever (2) | 48 | Lever, Needle Bearing, Grip, Pin, Shim, Plane Washer, Fitting, Nut |
| Control Lever (3) | 50 | Lever, Rod End, Nut, Bolt, Pedal, Bracket, Pin, Spring |
| Control Lever (4) | 52 | Cable, Joint, Nut, Washer, Rod End, Pin, Pin Split |
| Lever Lock | 54 | Joint, Nut, Washer, Rod, Link, Pin, Bushing, Ring |
| Pilot Pipings (1) | 56 | Bolt, Valve, Cylinder, Adapter, Elbow, Hose, Protector, Cover |
| Pilot Pipings (2-1) | 58 | Adapter, Union, Elbow, Hose, Protector, Tube |
| Pilot Pipings (2-2) | 60 | Adapter, Union, Elbow, Hose, Protector, Plate, Clip |
| Pilot Pipings (2-3) | 62 | Adapter, Union, Filter, Hose, Tube, Elbow |
| Pilot Pipings (3) | 64 | Adapter, Bracket, Hose, Protector, Clip, Valve, Union, Filter |
| Control Box | 66 | Stand, Cover, Panel, Bolt, Washer |
| Electric Parts (1) | 68-69 | Switch, Key, Monitor Lamp, Meter, Fuse Box, Relay, Timer, Diode |
| Electric Parts (2) | 71 | Float, Packing, Head Lamp, Bolt, Nut, Cover |
| Electric Parts (3) | 73 | Battery, Bracket, Relay, Horn, Fusible Link, Bolt, Nut |
| Electric Parts (4) | 75 | Pressure Switch, Thermo Switch, Wire Harness, Clip, Bolt, Spring Washer |
| Floor Plate | 77 | Rubber Bushing, Bracket, Bolt, Spring Washer |
| Canopy (1) | 79 | Roof Assembly, Frame, Weather Strip, Plate, Guard Assembly, Pole, Rubber Bushing, Bolt |
| Canopy (2) | 81 | Lock, Seat Screw, Spacer, Cover, Spring Washer, Bolt, Stay, Rubber |
| Seat | 83 | Slide Rail, Bracket, Bolt, Nut, Washer |
| Cover (1) | 85 | Support, Bracket, Side Cover, Center Cover, Bolt, Washer |
| Cover (2) | 87 | Door, Bolt, Nut, Washer, Rubber |
| Cover (2) | 89 | Bolt, Washer, Door, Nut, Rubber |
| Cover (3) | 91 | Bolt, Washer, Spring |
| Door Lock | 93 | Lock Assembly, Cover, Latch, Lever, Shaft, Spring, Cylinder Lock, Case |
| Track Frame | 95 | Bolt, Swing Circle Bearing, Plate, Packing, Plug, Guide, Washer |
| Blade | 97 | Seal, Bushing, Pin, Spacer, Fitting, Ring, Bolt, Cover |
| Travel Device | 99 | Sprocket, Bolt, Spring Washer |
| Front Idler | 101 | Idler Assembly, Bearing, Axle, O-Ring, Pin, Bushing, Plug, Seal Group |
| Adjuster _Ur_ | 103 | Cylinder Assembly, Cylinder, Rod, Spacer, Spring, Washer, Nut, Bolt |
| Adjuster _Urg_ | 105 | Cylinder Assembly, Cylinder, Rod, Spacer, Spring, Washer, Nut, Bolt |
| Lower Roller | 107 | Roller Assembly, Bushing, Collar, Axle, Pin, Seal Group |
| Track Link 400G _Ur_ | 109 | Track Link, Track Link Assembly, Pin, Bushing, Shoe, Bolt, Nut |
| Rubber Crawler _Urg_ | 111 | Rubber Crawler, Shoe Assembly |
| Center Joint | 113 | Spindle, Body, Cover, Seal, Ball, Ring |
| Travel Pipings | 115 | Adapter, O-Ring, Clamp, Pipe, Bolt, Washer |
| Blade Pipings | 117 | Seal, Adapter, O-Ring, Cylinder, Hose |
| Pipings Cover | 119 | Cover, Bolt, Washer, Spring |
| Offset Boom | 121 | Boom, Bushing, Pipe, Stopper, Seal, Pin, Ring, Bolt |
| Arm 1 | 123 | Arm Assembly, Arm Cylinder, Arm Pin, Arm Bushing, Arm Stopper |
| Bucket 0 | 125 | Bucket Assembly, Bucket Tooth, Bucket Side Cutter, Bucket Pin, Bucket Lock |
| Front Pipings (1) | 127 | Boom Cylinder, Offset Cylinder, Swivel Joint, Hose, Pipe |
| Front Pipings (2) | 129 | Arm Cylinder, Bucket Cylinder, Hose, Pipe, Clamp |
| Boom Cylinder Guard | 131 | Plate, Bolt, Cover, Rubber, Seat, Screw, Nut, Washer |
| Bucket 0 | 133 | Bucket, Adapter, Stopper, Cutter, Point, Pin, Rubber |
| Bucket 0 | 135 | Bucket, Adapter, Stopper, Cutter, Point, Pin, Rubber |
| Tools | 137 | Wrench, Bar, Handle, Spanner, Gun, Nozzle, Hose, Screwdriver |
| Spare Parts | 139 | Fitting, O-Ring |
| Name-Plate (Japanese) | 141 | Machine Name Plate, Caution Plate, Inspection Plate, Lubrication Plate, Accent Stripe |
| Name-Plate (French) | 143 | Machine Name Plate, Caution Plate, Inspection Plate, Lubrication Plate, Accent Stripe |
| Pump;Piston (for Japan) | 145 | Housing, Rotary Group, Hanger, Shaft, Cover, Piston, Plate, Plug |
| Pump;Piston (for Japan) | 147 | Housing, Rotary Group, Hanger, Shaft, Cover, Control Part |
| Pump;Piston (for Export) | 149 | Housing, Rotary Group, Hanger, Shaft, Cover, Control Part |
| Rotary Group | 151 | Piston, Block, Pin, Retainer, Plate, Guide |
| Cover Part | 153 | Cover, Plate, Bearing, Orifice, Pin |
| Control Part | 155 | Cover, Screw, Adjust Screw, Spring, Nut, O-Ring, Nut Cap, Ball |
| Case Part | 157 | Case, Ring, Seal, O-Ring |
| Pump;Gear | 159 | Frame, Housing, Gear, Plate, Metal, Ring, Pin, Coupling |
| Pump;Gear | 161 | Cover, Body, Gear, Bushing, Flange, Seal, Ring, Bolt |
| Motor;Oil (1_3) | 163 | Cover, Bearing, Pin, Plug, Bolt, Socket, O-Ring, Spring |
| Motor;Oil (2_3) | 165 | Case, Shaft, Block, Cylinder, Plate, Valve, Retainer, Holder |
| Motor;Oil (3_3) | 167 | Carrier, Gear, Planetary, Shaft, Bearing, Washer, Pin, Spring |
| Propell;Device (1_3) | 169 | Holder, Seal, Bearing, Nut, Plug, Housing, Ball, Gear |
| Propell;Device (2_3) | 171 | Shaft, Bearing, Ball, Seal, Oil Seal, Plate, Thrust Plate, Pin |
| Propell;Device (3_3) | 173 | Plate, Base, Plunger, Check Valve, Spring, Plug, O-Ring, Seat |
| Valve;Control (1_3) | 175 | Housing, Spool, Seal, Wiper, Plate, Spring, Seat, Screw |
| Valve;Control (2_3) | 177 | Spring, O-Ring, Plug, Shuttle, Sleeve, Poppet, Ball, Name-Plate |
| Valve;Control (3_3) | 179 | Shuttle, Spring, O-Ring, Plug, Poppet, Valve Relief |
| Valve;Control | 181 | Inlet Section, Outlet Section, Spool Section, Valve Relief, Name Plate, Tie Rod |
| Valve;Pilot | 183 | Casing, Spool, Spring, Spacer, Shim, Pusher Assembly |
| Valve;Pilot | 185 | Casing, Spool, Spring, Spacer, Shim, Pusher Assembly |
| Valve;Solenoid | 187 | Housing, Spring, O-Ring, Spool, Pipe, Seat, Plunger, Stopper |
| Valve;Shockless | 189 | Poppet, Spring, Plug, O-Ring, Cap, Screw, Plunger, Filter |
| Valve;Lock | 191 | Body, Spool, Lever, Pin, Washer, Ring, Bolt |
| Cyl | 193 | Cylinder Boom, Cylinder Arm, Cylinder Bucket, Cylinder Offset, Cylinder Blade, Tube, Rod, Piston |
| Cyl | 195 | - |
| Cyl.;Bucket | 197 | Cylinder, Tube, Rod, Piston, Bushing, Ring, Packing, Seal |
| Cyl.;Offset | 199 | Cylinder, Tube, Rod, Piston, Bushing, Ring, Packing, Seal |
| Cyl | 201 | Cylinder, Boom, Arm, Bucket, Offset, Blade, Tube, Rod |
Hitachi EX50UR Common Problems This Manual Covers
Hitachi EX50UR boom cylinder leaking, can't tell which seal kit and packing set matches my serial number
Check the boom cylinder parts list on page 193; it breaks each cylinder into tube, rod, piston, bushings, and individual packings and seals. Match every seal to its item number on the exploded view on page 192, then verify the serial number range in the list header. If two ranges overlap, measure the rod diameter in millimeters before ordering.
Manual Section: Boom Cylinder p. 193Not sure whether the undercarriage takes steel track links or a rubber crawler shoe assembly
Check the model suffix first: Ur machines run the 400G steel track link listed on page 109, Urg machines run the rubber crawler shoe assembly on page 111. The 400G link carries a 400 mm shoe. Order pins, bushings, and shoe bolts from the same page so the hardware matches the link assembly.
Manual Section: Track Link 400G _Ur_ p. 109Control lever feels sloppy, need pusher assembly, spool spring, and shim part numbers for the pilot valve
Check the pilot valve breakdowns on pages 183 and 185; each casing, spool, spring, spacer, shim, and pusher assembly carries its own item number. Count your shims and measure their thickness in millimeters before ordering, since the shim pack sets lever preload. Pull matching O-rings and fittings from the Spare Parts list on page 139.
Manual Section: Pilot Valve System p. 183Parts book shows two main piston pump versions, can't tell which rotary group fits my machine
Verify the market designation before ordering anything: the Japan-spec piston pump is listed on pages 145 and 147, the export version on page 149. Match the pump name plate code to the correct list, then order the piston, block, retainer, and plate from the Rotary Group breakdown on page 151. If the plate is unreadable, measure the pump shaft diameter in millimeters and quote it with your serial number.
Manual Section: Pump;Piston (for Export) p. 149Bucket teeth and side cutters worn down, can't identify the right point and adapter set
Check the bucket breakdowns on pages 125, 133, and 135; the manual lists several bucket options, each with its own points, adapters, side cutters, and pins. Measure your bucket width in millimeters and count the teeth, then match the assembly that fits both. Order fresh rubber lock pins with the points, they rarely survive removal.
Manual Section: Bucket 0 p. 125Frequently Asked Questions
What is the part number for the main frame of the excavator?
The main frame of the excavator is identified by part number 5002463. p. 2
What is the part number for the fan belt on the engine?
The fan belt for the engine is part number 4265245. p. 4
What is the part number for the radiator assembly for serial numbers 1583 and higher?
For serial numbers 1583 and higher, the radiator assembly is part number 4289868. p. 6
What is the part number for the air cleaner element for serial numbers 2343 and higher?
For serial numbers 2343 and higher, the air cleaner element is part number 4294846. p. 10
What is the part number for the fuel tank?
The fuel tank is identified by part number 6010546. p. 18
What format is this Hitachi EX50UR manual in?
A 201-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Hitachi EX50UR 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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