Mini Excavators

305 SR

Request A Quote 305 SR Attachments New and Used Inventory
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
305 SR Japan Only
US
Metric

Overview

The Cat® 305 SR Mini Hydraulic Excavator delivers high performance, durability and versatility in a compact design to help you work in a variety of applications.

Engine

Net Power
69.50 HP
51.80 kW
Net Power - 2,200 rpm - ISO 9249:2007, 80/1269/EEC
69.50 HP
51.80 kW
Bore
3.70 in
94.00 mm
Gross Power - SAE J1995
74.30 HP
55.40 kW
Engine Model - U.S. EPA Tier 4 Final/EU Stage V
Cat® C3.3B
Stroke
4.70 in
120.00 mm
Displacement
203.00 in³
3.33 l
Note
Net power advertised is the power available at the flywheel when the engine is equipped with air cleaner, exhaust system and fan.

Weights

Operating Weight
20385.00 lb
9245.00 kg
Minimum Operating Weight with Standard Stick*
19084.00 lb
8655.00 kg
Maximum Operating Weight with Standard Stick**
20385.00 lb
9245.00 kg
Note (1)
*Minimum Weight is based on rubber tracks, no counterweight, operator, full fuel tank, blade, and no bucket.
Note (2)
**Maximum Weight is based on steel tracks with rubber pads, counterweight, operator, full fuel tank, blade, and no bucket.

Weight Increase from Minimum Configuration

Steel Tracks with Pads
752.00 lb
341.00 kg
Counterweight
552.00 lb
250.00 kg

Travel System

Ground Pressure - Maximum Weight
5.90 psi
40.60 kPa
Maximum Traction Force - High Speed
6250.00 lbf
27.80 kN
Ground Pressure - Minimum Weight
5.50 psi
37.90 kPa
Travel Speed - Low
1.90 mile/h
3.10 km/h
Travel Speed - High
3.20 mile/h
5.10 km/h
Maximum Traction Force - Low Speed
15175.00 lbf
67.50 kN
Gradeability - Maximum
30 degrees

Service Refill Capacities

Hydraulic System
29.00 gal (US)
110.00 l
Hydraulic Tank
14.00 gal (US)
53.00 l
Engine Oil
3.00 gal (US)
11.20 l
Fuel Tank
39.00 gal (US)
147.00 l
Cooling System
2.60 gal (US)
10.00 l

Hydraulic System

Maximum Auxiliary Circuit - Primary - Flow at Pump
35.00 gal/min
131.00 l/min
Maximum Auxiliary Circuit - Primary - Pressure at Pump
4134.00 psi
285.00 bar
Operating Pressure - Equipment
4134.00 psi
285.00 bar
Digging Force - Stick - Standard
9509.00 lbf
42.30 kN
Operating Pressure - Travel
4134.00 psi
285.00 bar
Pump Flow at 2,400 rpm
44.00 gal/min
167.00 l/min
Digging Force - Bucket
13946.00 lbf
62.00 kN
Maximum Auxiliary Circuit - Secondary - Flow at Pump
9.00 gal/min
33.00 l/min
Maximum Auxiliary Circuit - Secondary - Pressure at Pump
4134.00 psi
285.00 bar
Operating Pressure - Swing
3626.00 psi
250.00 bar
Type
Load Sensing Hydraulics with Variable Displacement Piston Pump
Note
Flow and pressure are not combinable. Under load, as flow rises pressure goes down.

Swing System

Boom Swing - Left
60 degrees
Machine Swing Speed
10.60 r/min
10.60 r/min
Boom Swing - Right
50 degrees

Blade

Height
17.00 in
431.00 mm
Width - Standard
90.60 in
2300.00 mm
Width - Wide
96.50 in
2450.00 mm

Certification - Cab and Canopy

Tip Over Protective Structure (TOPS)
ISO 12117:1997
Roll Over Protective Structure (ROPS)
ISO 12117-2:2008
Top Guard
ISO 10262:1998 (Level II)

Sound

Note
European Union Directive "2000/14/EC"
Average Exterior Sound Pressure (ISO 6395:2008)
99.00 dB(A)
99.00 dB(A)
Operator Sound Pressure (ISO 6396:2008)
72.00 dB(A)
72.00 dB(A)

Air Conditioning System

Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.430 metric tonnes.

Dimensions - VAB In

Dig Depth
150.20 in
3815.00 mm
Maximum Blade Height
14.60 in
370.00 mm
Boom in Reach
122.80 in
3120.00 mm
Transport Height
97.40 in
2475.00 mm
Swing Bearing Height
29.80 in
756.00 mm
Cab Height
100.00 in
2541.00 mm
Vertical Wall
99.20 in
2520.00 mm
Maximum Blade Depth
16.00 in
407.00 mm
Maximum Dig Height
205.50 in
5220.00 mm
Overall Shipping Length
253.90 in
6450.00 mm
Overall Undercarriage Length
113.40 in
2880.00 mm
Maximum Reach at Ground Level
248.00 in
6300.00 mm
Overall Track Width
90.60 in
2300.00 mm
Boom Swing Right
37.00 in
935.00 mm
Ground Clearance
13.80 in
350.00 mm
Maximum Reach
256.50 in
6515.00 mm
Maximum Dump Clearance
135.80 in
3450.00 mm
Stick Length
71.70 in
1820.00 mm
Boom Swing Left
24.00 in
605.00 mm
Tail Swing without Counterweight
57.10 in
1450.00 mm
Track Belt/Shoe Width
17.70 in
450.00 mm
Tail Swing with Counterweight
62.40 in
1585.00 mm

Dimensions - VAB Out

Boom Swing Left
24.00 in
605.00 mm
Maximum Blade Depth
16.00 in
407.00 mm
Stick Length
71.70 in
1820.00 mm
Swing Bearing Height
29.80 in
756.00 mm
Cab Height
100.00 in
2541.00 mm
Maximum Dump Clearance
247.40 in
6285.00 mm
Maximum Blade Height
14.60 in
370.00 mm
Track Belt/Shoe Width
17.70 in
450.00 mm
Ground Clearance
13.80 in
350.00 mm
Tail Swing with Counterweight
62.40 in
1585.00 mm
Maximum Reach at Ground Level
303.70 in
7715.00 mm
Vertical Wall
146.70 in
3725.00 mm
Overall Track Width
90.60 in
2300.00 mm
Transport Height
97.40 in
2475.00 mm
Boom in Reach
106.70 in
2710.00 mm
Maximum Dig Height
322.00 in
8180.00 mm
Dig Depth
136.20 in
3460.00 mm
Overall Undercarriage Length
113.40 in
2880.00 mm
Boom Swing Right
37.00 in
935.00 mm
Overall Shipping Length
253.90 in
6450.00 mm
Tail Swing without Counterweight
57.10 in
1450.00 mm
Maximum Reach
310.40 in
7885.00 mm

Sustainability

Recyclability
96%
Features

ALL DAY COMFORT

  • A sealed and pressurized cab is equipped with an improved air conditioning system, adjustable wrist rests and a suspension seat to help keep you working comfortably all day long.

EASY TO OPERATE

  • Controls are easy to use and the intuitive Next Generation Monitor provides customizable machine operator preferences and easy to read machine information.

STICK STEER TRAVEL MODE

  • Moving around the job site is even easier with the Cat Stick Steer option. Easily switch from traditional travel controls with levers and pedals to joystick controls with a push of a button. The benefit of less effort and improved control is in your hands!

BIG PERFORMANCE IN A MINI DESIGN

  • Increased lifting, swinging, travel and multi-functioning performance help you get the job done more efficiently, and dig-to-blade allows for easy clean up.

SAFETY ON THE JOB SITE

  • Your safety is our top priority. The Cat Mini Excavator is designed to help keep you safe on the job. A back-up camera, courtesy work lights and a fluorescent retractable seat belt are just a few of the safety features we‚Äôve built into the machine.

SIMPLE SERVICE FOR LESS DOWNTIME

  • Maintenance is quick and easy on the Cat Mini Excavator. Routine check points are easy to access at ground level with grouped service points and robust service panels.

LOWER OPERATING COSTS

  • Equipped with features such as auto idle, auto engine shutdown, and efficient hydraulics with a variable displacement pump, the Cat Mini Excavator was designed with reducing your operating costs in mind.

UNMATCHED DEALER SUPPORT

  • Your Cat dealer is here to help you reach your business goals. From providing equipment solutions to operator training to service needs and beyond, your Cat dealer is ready to help.

SUSTAINABILITY

  • The Cat® C3.3B engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
  • Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels up to: 20% biodiesel FAME (fatty acid methyl ester) * or 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details.
  • Auto Idle helps reduce unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.
  • Engine Idle Shutdown Timer reduces fuel burn, greenhouse gas emissions and unnecessary idle time by shutting down the machine after a pre-set idling period.
  • Cruise control helps you maintain a constant speed as you travel across your jobsite saving fuel and reducing greenhouse gas emissions.
  • The Cat® Seat Belt Reminder provides audible and visual warnings to remind operators to buckle up during machine operation. The easy-to-install system is compatible with all equipment brands to help ensure operator safety.
  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
  • Remote Flash minimizes downtime and maintenance time while keeping your asset running with maximum efficiency. Alerts for machine updates are sent virtually from your Cat dealer and updates can be deployed without a dealer technician needing to be onsite.(if equipped)
  • Remote Troubleshoot decreases maintenance time and keeps your machine running with maximum efficiency by allowing your Cat dealer to virtually test the machine while working. Once a problem is identified, a technician can fix it the first time, saving time and money.(if equipped)
  • Cat Grade with advanced 2D and 3D technologies combine advanced guidance with optional automated machine control helping you reach grading targets while reducing fuel burn and greenhouse gas emissions by improving efficiency, job site productivity, and accuracy. (if equipped).
*Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel. (for use of blends higher than 20% biodiesel, consult your Cat dealer)
Standard Equipment
  • ENGINE
    • Cat C3.3 Diesel Engine (U.S. EPA Tier 4 Final/EU Stage V) – Electronic Engine, Turbo, Diesel Particulate Filter (DPF)
    • Automatic Engine Idle
    • Automatic Engine Shutdown
    • Automatic Swing Brake
    • Automatic Two Speed Travel
    • Fuel Water Separator with Indicator
    • Radial Seal – Double Element Air Filter
    • Extended Life Coolant, –37° C ( –35° F)
    • Ecology Drain
  • HYDRAULICS
    • Smart Tech Electronic Pump
    • Electronic Variable Displacement Piston Pump
    • Load Sensing/Flow Sharing Hydraulics
    • Power On Demand
    • Hydraulic Temperature Monitoring
    • Certified Accumulator
    • HYDO Advanced Hydraulic Oil
  • OPERATOR ENVIRONMENT
    • Top Guard ISO 10262 1998 Level I
    • ROPS ISO 12117-2:2008
    • Sealed and Pressurized Cab
    • Stick Steer Mode
    • Travel Cruise Control
    • Control Pattern Changer
    • Adjustable Wrist Rests
    • Molded Footrests
    • Removable, Washable Floor Mat
    • Travel Pedals and Hand Levers
    • Cat Key with Passcode Option
    • HVAC with Automatic Temperature Control
    • Hydraulic Lockout Controls
    • Integrated Lower Front Window
    • Assisted Front Window Overhead Storage
    • Rear Window Emergency Exit
    • Fabric, High Back, Suspension Seat
    • Retractable Seat Belt (75 mm/3 in)
    • Coat Hook
    • Cup Holder
    • LED Interior Light
    • Literature Holder
    • Mounting Bosses for Top and Front Guards
    • 12V Power Socket
    • Radio – Bluetooth, Auxiliary, Microphone, USB (charging only)
    • Skylight
    • Signaling/Warning Horn
    • Cab and (left side) Boom Work Lights
    • Utility Space for Mobile Phone
    • Next Generation Color LCD Monitor (IP66)
      – Jog Dial Interface
      – Fuel Level and Coolant Temperature Gauges
      – Maintenance and Machine Monitoring
      – Performance and Machine Adjustments
      – Numeric Security Code
      – Multiple Languages
      – Camera Ready (IP68 & IP69K)
      – Hour Meter with Wake Up Switch
  • UNDERCARRIAGE
    • Greased and Lubricated Track
    • Hydraulic Track Adjusters
    • Tie Down Eyes on Track Frame
    • Dozer Blade
    • Dozer Float
    • Bolt-on, Reversible Wear Edge
  • BOOM, STICK AND LINKAGES
    • Variable Angle Boom
    • Standard Stick (1820 mm/71.7 in)
    • Front Shovel Capable – Pin-on/Manual Coupler/Hydraulic Coupler (not available in all regions)
    • Thumb Ready (not available in all regions)
  • ELECTRICAL
    • 12 Volt Electrical System
    • 60 Ampere Alternator
    • Circuit Breaker
    • 900 CCA Maintenance Free Battery
    • Battery Disconnect
    • Ignition Key Stop Switch
  • OTHER
    • Locks on External Enclosure Doors
    • Lockable Fuel Cap
    • Beacon Socket
    • Rear Reflectors
Optional Equipment
  • OPERATOR ENVIRONMENT
    • Push to Start with Bluetooth® Key
    • Air Suspension Heated Seat
    • Rain Visor
    • Next Generation Advanced Monitor (below are all included with Next Generation Advanced Monitor option)
      – Touch Screen
      – Site Reference System
      – High Definition Camera Capable (IP68 & IP69K)
      – Numeric Security Code
  • UNDERCARRIAGE
    • Wide Dozer Blade
    • Steel Tracks (450 mm/17.7 in wide)
    • Wide Steel Tracks (600 mm/23.6 in)
    • Steel Track with Rubber Pads
    • Track Guides
  • BOOM, STICK AND LINKAGES
    • Attachments including Buckets, Augers and Hammers
    • 2nd Auxiliary Hydraulic Lines
    • Boom Lowering Check Valve
    • Stick Lowering Check Valve
    • Certified Lifting Eye
  • ELECTRICAL
    • Product Link Elite (regulations apply)
    • Travel Alarm
    • Rearview Camera
    • Rotating Beacon
  • GUARDING
    • Mesh Front Guard ISO 10262 1998 Level I
    • Heavy Duty Front Guard ISO 10262 1998 Level II
    • Overhead Cab Guard ISO 10262 1998 Level II
    • Polycarbonate Front Window EN356 P5A
    • Track Guards
  • OTHER
    • Additional Counterweight
    • Water Jacket Heater
    • Refueling Pump