Compact (mini) excavator, 5-ton class
CAT 305: specs & used buying guide
Last reviewed . We review this page periodically for accuracy.
Quick answer
The CAT 305 is a 5-ton-class compact excavator. In the current 305 CR form it offers about 45 net horsepower and a maximum dig depth around 11–12 ft depending on the stick. Because '305' spans several generations, always confirm which one a listing represents before comparing specs or price.
Key facts
- Machine type: 5-ton-class compact excavator
- 'CAT 305' is a family across generations (305C CR, 305.5E2, current 305 CR) — not one machine
- 305 CR net power: approximately 45 hp (33.6 kW)
- 305 CR maximum dig depth: approximately 134.6 in (standard stick) / 144.5 in (long stick)
- 305 CR operating weight (with cab): approximately 12,688 lb (5,754 kg)
Overview
The CAT 305 is a 5-ton-class compact excavator, one of the most popular sizes for contractors who need more reach, depth, and weight than a 3.5–4-ton machine. The current 305 CR pairs solid dig performance with Caterpillar's dealer and parts network.
'305' has denoted several generations over the years. The figures here reflect the current 305 CR; earlier 305-series machines differ in weight, power, and features. Confirm the generation before comparing.
Key specifications
| Machine type | Compact excavator (5-ton class) |
|---|---|
| Net power (305 CR) | ~45 hp (33.6 kW) |
| Maximum dig depth (305 CR) | ~134.6 in std stick / 144.5 in long stick |
| Operating weight (305 CR, cab) | ~12,688 lb (5,754 kg)Maximum configuration with cab; varies by options. |
"CAT 305" refers to a 5-ton-class family that has spanned several generations (for example 305C CR, 305.5E2, and the current 305 CR), not a single machine. The figures below reflect the current 305 CR; earlier 305-series machines differ. Confirm the exact generation and its spec sheet.
Figures reflect the current 305 CR generation. Earlier 305-series machines differ. Dig depth depends on the stick fitted, and operating weight depends on cab/canopy and options. Confirm the specific unit and generation.
Common applications
- Utility and drainage trenching at depth
- Foundation and footing excavation
- Site prep and grading
- Material handling with the right attachments
- General 5-ton-class excavation work
Strengths
- Solid dig depth and reach for the class
- Cat dealer and parts support
- Popular, well-supported size class
- Available stick options for depth
What to check on a used one
- Identify the generation — specs and value differ across 305-series machines
- Undercarriage wear on tracks, rollers, and sprockets
- Hydraulic leaks and weak functions
- Confirm auxiliary hydraulics and coupler for your attachments
How hours affect value
Weigh hours against service history and undercarriage condition, and factor in the generation. A well-maintained current 305 CR and an older 305-series machine at similar hours are different propositions.
Inspection checklist
- Undercarriage: track, roller, idler, and sprocket wear
- Hydraulics: leaks and strong, smooth function on all circuits
- Auxiliary hydraulics and coupler if fitted
- Boom, arm, and bucket pins and bushings
- Blade and cylinder condition
- Cold-start, smoke, and hour meter vs records
Maintenance & records to ask for
- Confirm engine and hydraulic service and emissions-system condition
- Check undercarriage service history
- Ask about major repairs and Cat dealer parts history
Attachments & transport
Confirm the coupler type and auxiliary hydraulics for the attachments you intend to run, and match flow requirements to the machine.
The current 305 CR can approach 12,700 lb with a cab and options — confirm the exact weight and your trailer/tow ratings, and budget transport on distant units.
Questions to ask the seller
- Which generation is this (305C CR, 305.5E2, 305 CR, or other)?
- Which stick is fitted, and does it have auxiliary hydraulics?
- Are there Cat dealer service records and undercarriage history?
- Can I dig with it under load and cycle every function?
Comparable models
- Kubota KX040-4
4-ton-class machine — lighter and easier to transport.
- John Deere 35G
Smaller 3.5-ton-class alternative.
- Bobcat E35
3.5-ton-class compact excavator family.
Head-to-head comparisons
Side-by-side spec comparisons with the models buyers cross-shop most.
Frequently asked questions
Related buying guides
Sources & verification
Specifications on this page were triangulated against the publishers below and reviewed on the date shown. Figures vary by configuration and model year — always confirm the exact specs on the spec sheet and data plate of the specific unit.
- Caterpillar — official product specifications305 CR net power, maximum dig depth by stick, and operating weight with cab
- RitchieSpecs equipment specification databaseIndependent cross-check of operating weight, rated operating capacity, and engine power across configurations
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