2006–2007 Terex TA27, TA30 G7 Articulated Dump Truck Maintenance Manual (P/N 15503430)

This Terex maintenance manual covers 2006–2007 TA27 and TA30 G7 (N.A.F.) articulated dump trucks. The document is identified as SM889/894, with Re-Order P/N 15503430.

Search and diagram detail: Service text and tables are searchable, but labels within the electrical wiring drawings are not. There are no embedded PDF bookmarks. Small wiring and connector labels require zooming and can appear faint at full-page view.

• Engine and cooling: Engine removal and installation, Quantum electronic fuel-system fault codes, electronic fan-clutch tests, and cooling-system diagnosis.

• Transmission controls: EST-37 and VTS-3 diagnosis, AEB-Starter calibration, sensor and CAN-bus checks, and transmission removal and installation.

• Axles and chassis: Differential drive-head repair, planetary reduction gearing, multi-disc locks, articulation pivots, and front and rear suspension service.

• Hydraulics and steering: Main hydraulic pump overhaul, load-sense pressure tests, steering orbitrol valve service, and steering and body cylinder repair.

• Brakes: Oil-immersed multi-disc brake wear checks, parking brake service, treadle valve rebuilding, system bleeding, and nitrogen accumulator precharge testing.

• Electrical and body controls: IQAN-TOC8 fault diagnosis, wiring diagrams, connector details, body-hoist troubleshooting, and transmission oil cooler fan controls.

This manual is suited to heavy-equipment technicians with hydraulic test equipment, electronic diagnostic tools, and lifting facilities for major component work.

Cummins QSM11 Engine, Fuel System and Cooling

The engine section covers mounting work, routine servicing, and Quantum electronic fuel-system diagnostics. Internal engine repair requires the engine manufacturer's separate service manual.

The electronic foot-pedal chapter describes Cummins INSITE calibration checks after pedal replacement or harness disconnection. Any required recalibration is reserved for authorized Cummins personnel.

Cooling coverage extends to radiator and air-to-air charge cooler removal, transmission and hydraulic oil coolers, and fan-drive testing.

ZF Transmission Diagnosis and Calibration

The TA27 uses the ZF 6WG 260; the TA30 uses the ZF 6WG 310 RPC. Model-specific data distinguish the TA27's optional retarder from the TA30's standard retarder.

Fault-code charts pair TCU reactions with checks for wiring, sensors, solenoids, and clutch slip. AEB calibration addresses deteriorating shift quality and replacement of the transmission, ECU, or shift lever; the listed AEB Starter is P/N 15273664.

Gear-selection logic, lockup clutch operation, and retarder control are supported by a transmission Oil Circulation Diagram. Internal transmission repair is referred to the transmission manufacturer's separate manual.

Axles, Drivelines and Articulation Repair

Differential procedures cover crown-wheel backlash, bearing preload, and shim selection. Front and rear drivelines have diagnosis charts, while suspension sections address equalizer beams and control-link mountings.

Articulation and oscillation pivot procedures cover bearing replacement and frame separation. The manual warns that excessive separation during articulation-bearing work can damage attached hydraulic and electrical connections.

Hydraulic, Steering and Brake Troubleshooting

Hydraulic routing is documented in the Steering System Schematic, Body System Schematic, Braking System Schematic, and Diff-lock/Retarder Valve Schematic. Pump coverage includes internal disassembly, pressure-regulator adjustment, and wear limits.

Body-hoist troubleshooting distinguishes electrical-command faults from low pressure, sticking valves, and pump problems. That helps narrow down a slow or non-lifting body before selecting components for replacement.

The IQAN-TOC8 section provides LED error codes, the IQAN TOC8 ECU (C1) Pin Connections diagram, and RS232/IQANdevelop diagnostic information. Its body-float explanation identifies how trapped pressure can leave the body off the chassis and damage hinge points or hoist cylinders during travel.

Brake sections add accumulator charging, temperature/precharge charts, and treadle-valve rebuild criteria. Service-tool references identify Multi-Gauge P/N 15269784 and IQAN Develop interface P/N 15500834, plus fabrication drawings for cylinder tools.

Cab, Air Conditioning and Service References

Cab tilting, driver-seat repair, and R-134a air-conditioning leak testing, evacuation, and charging are covered. Reference material includes component-specific torque tables, axle and standard fastener torques, fluid capacities, electrical test values, and lubrication schedules.

Follow the manual's precautions for stored hydraulic pressure, supported bodies and cabs, wheel blocking, and articulation locks.

Printable PDF and Page Breakdown

The download is one printable English 384-page PDF: 354 technical and reference pages, six front-matter pages (cover, re-order information, introduction, safety notice, and two contents pages), and 24 blank or separator pages. All are included in the stated total.