2001 Takeuchi TB125 TB135 TB145 Excavator Workshop Manual (P/N CG4E004)

Takeuchi workshop manual Book No. CG4E004 covers the 2001 TB125, TB135, and TB145 compact excavators in canopy and cab configurations, including standard, long-arm, and telescopic-arm versions. It details engine, chassis, hydraulic, and electrical specifications across the serial ranges listed above.

Supplied as a 1,087-page PDF, combining the Takeuchi workshop sections with Yanmar engine and fuel-injection documentation.

• Engine repair: Engine removal, cylinder-head service, valve adjustment, piston and crankshaft inspection, and Yanmar TNE/TNV disassembly and reassembly procedures.

• Hydraulic units: Pump, control-valve and pilot-valve repair, cylinder inspection, relief-pressure adjustment, and hydraulic circuit diagrams for different configurations.

• Travel and slew motors: Motor and reduction-gear service, swivel-joint repair, track-adjuster work, and undercarriage inspection standards.

• Performance diagnosis: Troubleshooting flowcharts, pressure tests, travel and slew checks, cylinder-drift measurements, and standard versus allowable service values.

• Electrical controls: Serial-specific wiring diagrams, starting and preheating circuits, TB145 proportional-control diagnosis, and security-system troubleshooting.

• Attachments and cab equipment: Boom, arm, bucket and dozer-blade removal procedures, attachment clearances, and air conditioner service and diagnosis.

Written for personnel who perform machine maintenance, this manual assumes workshop skills; injection-pump adjustment requires the specialized pump tester described in the fuel-equipment section.

Engine and Hydraulic Changes by Serial Number

TB125 changes from 3TNE82A to 3TNV82A at S/N 12514526. TB135 changes from 3TNE88 to 3TNV88 at 13514051; TB145 changes from 4TNE88 to 4TNV88 at 14513261.

Separate TB125 hydraulic-pump sections cover the change at S/N 12512126, while travel-motor sections split at 12514526. These distinctions help you select the correct component configuration and repair procedure before disassembly.

Hydraulic Units, Cylinders and Fault Isolation

Hydraulic-unit repair extends to piston groups, gear pumps, matched control-valve spools and bodies, and motor reduction gears. Cylinder sections cover the boom, arm, bucket, dozer blade and swing cylinder, plus the TB145 telescopic-arm bucket cylinder and tensioning cylinder.

Fault charts address weak hydraulics, travel drift, slew overrun and excessive cylinder drop. TB145 circuit drawings distinguish standard, second auxiliary and high-flow hydraulics.

The hydraulic service notes explain how omitted tank pressurization after hydraulic-unit installation can cause pump cavitation and shorten pump life.

Yanmar Engine and Fuel-Injection Repair

The 3TNE, 4TNE, 3TNV and 4TNV material includes valve-seat and guide work, timing gears, trochoid oil-pump service and internal wear checks. Water-pump service, thermostat tests and cooling-system leak checks are also covered.

For TNV fuel-injection repair, the included YPD-MP2/YPD-MP4 volume adds fuel-injection pump and governor disassembly, injection-timing adjustment, nozzle testing and pump-tester setup. The TNV engine manual itself provides only an outline of the MP pump.

Tool references include valve-spring compressor 129100-92630 and compression-gauge kit TOL-97190080. Turbocharger overhaul applies to the additional turbocharged engine variants identified in the Yanmar volumes.

Electrical Diagnosis, Air Conditioning and Security

The engine documentation provides starter-motor connecting diagrams and alternator standard output characteristics charts. Component exploded views show assembly relationships throughout the manual.

TB145 proportional-control coverage includes controller fault LEDs and solenoid-current adjustment. Air conditioner sections provide component service and manifold-gauge diagnosis.

The security system section covers immobilizer key registration, deregistration and troubleshooting. Registration procedures require the machine's authorized Registration Key.

Service Standards and Workshop Precautions

Reference data includes hydraulic-hose and steel-pipe fitting torques, ISO strength category 10.9 bolt tables, tightening-sequence drawings, fuel and lubricant capacities, wear limits and intake/exhaust valve-clearance specifications.

Boom, arm, bucket and dozer-blade cylinder bore and stroke dimensions accompany performance standards for hydraulic pressure, travel speed and slew time.

Always verify your site safety protocols and rely on the complete publication before service, particularly for supported attachments, residual hydraulic pressure and lifting heavy assemblies.

File Contents and Readability

The single PDF contains:

• Takeuchi workshop sections and engine application page: 665 pages.
• Yanmar TNE engine manual: 135 pages, including two appended exploded-view sheets.
• Yanmar 3TNV/4TNV engine manual: 221 pages; Publication No. M9961-02E050.
• YPD-MP2/YPD-MP4 fuel-injection manual: 66 pages; Literature No. M9961-03E070.

All covers, blank pages, revision sheets and additions are already included in these counts.

Text search: Available in much of the workshop, TNV and pump material. The TNE manual and many diagram labels are not searchable.

Navigation and diagrams: Embedded bookmarks cover the main sections and detailed TNV topics. Small labels in dense wiring diagrams require zooming.