Used Caterpillar 329D Excavator

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Here is a detailed English introduction to the Caterpillar 329D Hydraulic Excavator.

The Caterpillar 329D is a mid-to-large size hydraulic excavator that was manufactured in the late 2000s, succeeding the 325C and 328D series. It is widely recognized for its robust performance, reliability, and versatility in heavy construction, quarrying, and infrastructure projects. It sits between the 325D and the larger 330D in Cat’s D-Series lineup.

Overview

The Cat 329D was engineered to deliver high productivity with lower operating costs. It features a powerful Cat C7 ACERT engine, an advanced hydraulic system for precise control, and a durable structure designed for tough working conditions. The "D" series introduced significant improvements in fuel efficiency, operator comfort, and serviceability compared to its predecessors.

Key Specifications

Engine Model: Cat C7 ACERT
Net Power: 204 HP (152 kW) @ 1,800 rpm
Operating Weight: Approximately 30,115 kg to 33,045 kg (66,400 lbs to 72,850 lbs), depending on configuration (reach boom, mass boom, long undercarriage).
Bucket Capacity: Generally ranges from 0.9 m³ to 2.0 m³ (1.18 yd³ to 2.62 yd³).
Max Digging Depth: Up to 8,230 mm (27 ft) depending on arm and boom configuration.
Max Reach at Ground Level: Up to 11,300 mm (37 ft).
Travel Speed: 5.3 km/h (3.3 mph) in high range.
Tail Swing Radius: Standard counterweight is around 2,830 mm.

Detailed Features

1. Engine and Emissions

The 329D is powered by the Cat C7 ACERT (Advanced Combustion Emissions Reduction Technology) engine. This 7.2-liter, 6-cylinder, turbocharged and aftercooled diesel engine meets U.S. EPA Tier 3 / EU Stage IIIA emission standards. ACERT technology optimizes fuel combustion through precise control of the air-to-fuel ratio, multiple injection fuel delivery, and advanced electronics.

Power Management: The electronic control module manages fuel delivery to match power output to operational demand, reducing fuel consumption without sacrificing breakout force or lift capacity.
Automatic Engine Speed Control: This feature reduces engine RPM when the hydraulics are not under load (idle state), further saving fuel and reducing noise.
Cold Weather Starting: An intake air heater is standard for reliable starting in cold conditions, with an optional ether start aid available.

2. Hydraulic System

The hydraulic system is the heart of the 329D’s performance. It uses a positive flow control (PFC) system that provides precise implement response.

Main Pumps: Two variable-displacement piston pumps.
Maximum Flow Rate: 2 x 235 L/min (62.1 gal/min), providing ample oil flow for high-speed boom, arm, and bucket movements.
System Pressure: Heavy lift mode increases system pressure to handle demanding lifting tasks. The standard implement pressure is around 35,000 kPa (5,076 psi).
Boom and Arm Regeneration Circuits: These circuits speed up the boom lowering and arm in/out cycles, improving cycle times in trenching and truck loading applications.
Auxiliary Hydraulics: The machine is available with a tool control system, offering single-acting, double-acting, and high-flow configurations for attachments like hammers, shears, compactors, and multi-processors. Proportional control joysticks allow for fine modulation of auxiliary attachments.

3. Operator Environment

Cat invested heavily in the D-Series cab, making it one of the most comfortable and productive operator stations of its era.

Cab Structure: The cab is attached to the frame with viscous rubber mounts, reducing vibration and noise. The interior sound level is remarkably low.
Monitor and Controls: The full-color graphical display monitor provides the operator with critical information such as engine status, hydraulic parameters, maintenance schedules, and a rearview camera feed (if equipped). The monitor is intuitive, using a jog dial and quick-access buttons.
Joysticks: Low-effort pilot-operated joysticks are standard, ergonomically positioned on adjustable armrests to reduce fatigue.
Visibility: Large glass areas, a skylight with a sunshade, and a sloped engine hood provide excellent all-around visibility to the trench, front linkage, and rear.
Climate Control: An automatic heater and air conditioning system maintains a consistent cab temperature.

4. Structure and Undercarriage

The 329D is built for durability in demanding applications.

Boom and Arm: The machine was offered with two main boom options: a Reach Boom for general construction and maximum working envelope, and a Mass Excavation Boom for heavy lifting and high bucket forces in rock or dense soils. Arms (sticks) come in multiple lengths to optimize digging depth and breakout force.
Carbody and Frame: The upper frame features reinforced mounting points for the boom, and the carbody is a robust welded structure designed to absorb high stress.
Undercarriage: The Long (L) undercarriage is a hallmark of the 329D L model. It features a heavy-duty track roller frame, lubricated and sealed track links, and robust final drives. The longer track-on-ground provides exceptional stability, particularly when working over the side or lifting.
Counterweight: A heavy cast counterweight is standard. An optional additional counterweight package was available to increase lift capacity.

5. Maintenance and Serviceability

The 329D was designed with a focus on reducing daily maintenance time and making major component access safe and fast.

Ground-Level Access: Many key service points, including engine oil dipstick, fuel filters, water separator, and hydraulic system sight glass, are accessible from ground level.
Side-by-Side Cooling System: The radiator, hydraulic oil cooler, and air-to-air aftercooler are positioned side-by-side, not stacked. This prevents the clogging of coolers with debris and makes cleaning significantly easier.
Swing-Out Door: A one-piece swing-out door provides wide access to the AC condenser, charge air cooler, and radiator.
Filter Locations: Hydraulic return filter and pilot filter are located in a compartment accessible from the pump house side. The engine air cleaner has a dust ejector and service indicator in a convenient location.
S·O·S (Scheduled Oil Sampling) Ports: Sampling ports for engine oil, hydraulic oil, and coolant are integrated, allowing for fluid analysis without interrupting the system.

Common Configurations and Applications

The Cat 329D L (Long Undercarriage) is the most common version. Its primary applications include:

General Earthmoving: Site preparation, basement excavation, and trenching for utilities.
Road Building: Slope finishing, ditch cleaning, and truck loading.
Quarry Work: Loading processed aggregates or working as a secondary excavator in a face. The mass excavation configuration is preferred here.
Heavy Lifting: Lifting and placing heavy pipes, manholes, and concrete barriers, thanks to its excellent stability and powerful lift capacity.
Demolition: The high-reach demolition front option (if so equipped from the factory or aftermarket) allows it to be used for tearing down mid-rise structures.

Summary

The Cat 329D is respected as a well-balanced, durable machine that represents a sweet spot in power-to-weight ratio. Its ACERT engine provides strong, usable power, while the positive-flow hydraulics deliver the finesse needed for precise grading. For contractors and operators, the combination of the spacious, quiet cab and the simple, ground-level serviceability made the 329D a benchmark in its class during its production run, solidifying its reputation as a reliable workhorse on any job site.

Non flooded

No accident

Original product

Used Caterpillar 329D Excavator

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