1988 Hitachi EX225USR & EX225USR-LC Excavator Service Manual

Hitachi EX225USR and EX225USR-LC excavator service manual covering operational principles and systems, including electrical and hydraulic circuits, component functions, and specifications. Ref: KM-193E

4.6starstarstarstarstar_half(5)
visibility Preview Available
Hitachi 1988 Hitachi EX225USR & EX225USR-LC Excavator Service Manual manual page preview - page 1 of 542

Sample pages from the 1988 Hitachi EX225USR & EX225USR-LC Excavator Service Manual manual

Hitachi 1988 Hitachi EX225USR & EX225USR-LC Excavator Service Manual manual preview page 1 - thumbnail
Hitachi 1988 Hitachi EX225USR & EX225USR-LC Excavator Service Manual manual preview page 5 - thumbnail
info_outline Click thumbnails to preview different pages
$25.59 (incl. VAT) Original OEM Factory Manuals & Data Instant Download / No Shipping Fees
OR BUY NOW
verified_user
Lifetime Access
Re-download anytime
flash_on
Instant Download
Get it immediately
lock
Secure Payment
PayPal
Technical Safety Notice
keyboard_arrow_down

This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Hitachi Models Covered & Key Technical Specifications

Models: EX225USR, EX225USR-LC
Sub-models / Variants: Hydraulic Excavator, Backhoe, Face Shovel, HP Mode, E Mode, LC (Long Crawler)
Build Years: 1988
Serial Numbers: Up to 10235, 10236 and up
Technical Data:

  • Engine: ISUZU A-6BG1T, 6-cylinder diesel, 6 494 cc
  • Rated Output: 99.3 kW (135 PS) at 1950 rpm, 106.6 kW (145 PS) at 2150 rpm (HP Mode)
  • Operating Weight: 21700 kg (EX225USR), 22500 kg (EX225USR-LC)
  • Bucket Capacity: 0.8 m³ (PCSA heaped)
  • Main Hydraulic Pump: Variable displacement plunger, 198.9 L/min x 2
  • Main Relief Pressure: 34.3 MPa (Normal), 36.3 MPa (Power Boost)
  • Swing Speed: 13.9 min⁻¹
  • Travel Speed: 5.3/3.4 km/h (fast/slow)
Technical Specifications
keyboard_arrow_down
Document Number / Seller:
31054 / Robert Robinson
File Size:
21.67 MB
File Type:
PDF
Language:
English
Pages:
542
Printable:
Yes
Category:
Excavator
Last updated / verified
Dec 27, 2025

Hitachi Manual Features & Content Preview

Technical Operations for the 1988 Hitachi EX225USR & EX225USR-LC

  • Covers 1988 Hitachi EX225USR and EX225USR-LC hydraulic excavators, documenting operational principles for both backhoe and face shovel configurations
  • Official Hitachi technical manual publication number KM-193E, volume TO193E-00
  • Contains 41 detailed component layout diagrams, hydraulic circuit schematics, and electrical system logic flow charts
  • Files are delivered as a direct download the moment payment clears
  • Stored against your account so you can retrieve it after a hard-drive loss
  • Full-text search finds any component name or technical spec in seconds
  • Laid out for standard letter and A4 printing
  • This 1988 technical manual provides the foundational operational theory for the EX225USR and EX225USR-LC, documenting the specialized hydraulic pump controls, electrical circuits, and swing device functions essential for diagnostics

Component and System Walkthrough

This technical manual details the operational principles behind the primary systems of the 1988 Hitachi EX225USR and EX225USR-LC. The documentation includes deep dives into the control system, explaining microcomputer-based MC signals to the engine and hydraulic pumps. Sections dedicated to the hydraulic circuit describe the operation of main pumps, pilot circuits, and spool-regulated functions, providing a clear reference for understanding combined machine operations. Electrical sections map the power, start, charge, and preheat circuits, alongside surge voltage prevention and accessory power distribution architectures.

Operational Specs and System Preview

Engine control documentation covers auto-idle, auto-warming, and engine learning protocols that adjust performance based on machine state. The technical manual lists component specs including the ISUZU A-6BG1T engine performance curves, pump relief pressure thresholds, and cylinder rod diameters. Relief valve settings for the swing device and travel motor are documented for understanding how factory technical documentation is structured for these heavy-duty units. Rated engine output for the 1988 Hitachi EX225USR is 99.3 kW at 1950 rpm. Main relief pressure is documented at 34.3 MPa under normal operation. The engine firing order is explicitly specified as 1-5-3-6-2-4 in the component specification data.

Note: This page is a technical theory overview for the manual; it does not provide repair or diagnostic instructions.

This official 542-page technical manual covers the 1988 Hitachi EX225USR and EX225USR-LC, providing exhaustive details on operational principles for hydraulic, electrical, and control systems required for an expert technical review.

Manual FAQ, Purchase & Download Details

Are specific performance figures and engine technical specifications included in the general sections? keyboard_arrow_down

General specifications chapter includes detailed technical data for the ISUZU engine, including compression ratios, rated output, and lubrication system parameters.

Does the document provide exploded views of the main components to help identify parts locations? keyboard_arrow_down

Component layout sections contain illustrated diagrams that show the arrangement of major excavator systems. These visuals provide a clear reference for the location of parts such as the hydraulic pumps, control valves, and travel devices.

Can I find information regarding the electrical system layout, including harness references and component diagrams? keyboard_arrow_down

Electrical chapters contain detailed diagrams showing the overall system configuration and the placement of relays, monitors, and switch panels. These sections serve as a comprehensive visual directory for the machine's electrical architecture. Connector references and system layouts are included to help clarify the positioning of various sensors and electronic controls.

Customer Reviews

Read what our customers say about this Hitachi Excavator manual and share your own experience.