Takeuchi’s TB45 workshop manual (P/N PUB. 1) covers the compact excavator equipped with the Isuzu C240 diesel engine, with machine disassembly procedures, hydraulic component information, maintenance standards, and hydraulic troubleshooting.

PDF Search, Diagram Detail, and Page Count

Search and diagram viewing: PDF text search and embedded bookmarks are not available. Small component labels and terminal markings in the electrical and hydraulic circuit diagrams require zooming for comfortable reading.

One printable English PDF contains 208 pages, including six cover or section-divider pages and twelve blank or header-only pages. Forewords and contents pages are also included in that total.

Hydraulic Fault Diagnosis and Machine Disassembly

The following selected coverage highlights outline the main workshop content. Further topics include recommended lubricants and heater removal.

• Machine disassembly: Step-by-step removal procedures for the crawler belts, track rollers, travel motors, front idlers, hoe attachment, cabin, and upper machinery.

• Hydraulic pump repair: Internal disassembly, gear and bushing inspection, seal checks, reassembly, and test-operation procedures for the three-section gear pump.

• Hydraulic troubleshooting: Symptom-led charts for weak or missing operation, uneven travel, slew overrun, cylinder drift, and dozer blade support problems.

• Control and drive systems: Main and sub control valves, selector valve, joystick controls, two-speed travel motors, and slew motors with and without parking brakes.

• Performance and wear checks: Travel and slew tests, cylinder operating times, lever force and play, slew bearing checks, and undercarriage wear standards.

• Circuit diagrams: Overall hydraulic and electrical circuit diagrams, plus serial-specific hydraulic layouts accompanying the troubleshooting charts.

Written for personnel engaged in machine maintenance, this manual includes work requiring hydraulic test equipment and suitable lifting gear.

Component Disassembly and Reassembly

The documentation follows the lower machinery, hoe attachment, and upper machinery through illustrated removal sequences. Reassembly explanations concentrate on points requiring particular care rather than repeating every removal step in reverse.

Structural work: Turntable and slew bearing removal, bearing orientation, and central swivel joint installation are covered. The bearing instructions identify a weak section marked “S”; incorrect orientation can leave that section exposed to damaging loads.

Access and engine work: Procedures cover the operator seat, control boxes, engine compartment covers, tanks, and engine removal. Radiator installation includes alignment guidance. Engine coverage does not extend to a complete internal Isuzu C240 overhaul.

Heavy-component removal involves suspended loads. The manual specifies qualified crane operation and appropriate support for raised machinery.

Hydraulic Repair Depth and Configuration Differences

The gear-pump section combines an exploded disassembly drawing with inspection criteria for the body, gears, bushings, and seals. Its test-operation guidance covers pressure loading, temperature observations, and discharge checks after reassembly.

Other hydraulic units: Cylinder sections identify internal seals and components. Travel-motor drawings show the motor, valve, and planetary reduction gear, while the swivel-joint section identifies its internal construction. These sections do not provide the same complete internal rebuilding sequence as the pump section.

Main control valve: Separate structure drawings distinguish the serial-number groups listed above. The accompanying explanations describe differences in arm-accelerator flow and bucket load-check arrangements, helping technicians select the relevant circuit layout before interpreting a fault.

The hydraulic installation cautions link inadequate tank pressurization with pump cavitation and reduced pump life.

Troubleshooting, Test Equipment, and Reference Tables

The troubleshooting charts connect symptoms to numbered checks and corrective actions. Travel diagnosis distinguishes crawler tension, pump delivery, relief valves, swivel-joint faults, and motor leakage; boom diagnosis separates cylinder leakage from leakage through the control valve.

This diagnostic structure helps narrow the likely cause before major disassembly. The manual also provides a dimensioned drawing and part number 00079-90003 for the pressure-sensor-port adapter used in hydraulic testing.

The guide lists standard values for lever operating force and acceptable play. Performance checks specify measurement conditions and distinguish standard from permissible results, while tightening tables cover hydraulic hose fittings, pipe fittings, and bolts and nuts.

Selected Roller Play and Swivel Alignment Specifications

For both carrier rollers and track rollers, the inspection tables list standard axial play of 0.5 mm and a permissible value of 1.0 mm.

The swivel-joint installation instructions specify center runout within 0.25 mm, checked with a dial gauge. This is an installation alignment value, separate from the undercarriage wear limits.