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John Deere 120C Excavator – Parts, Specs

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John Deere 120C Excavator – Parts, Specs
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John Deere 120C Excavator – Parts, Specs
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Part # John Deere 120C Excavator – Parts, Specs

Description:

Serial Number Location

The serial number plate is typically located on the right-hand side of the upper frame, near the cab entrance or inside the operator's compartment. Always verify this number before ordering replacement parts.


Key Specifications

  • Model Years: 2003 – 2008

  • Engine: John Deere PowerTech 4045H, 4-cylinder turbocharged diesel

  • Net Power: 89 hp (66 kW) @ 2,200 rpm

  • Operating Weight: 28,840 lb (13,080 kg)

  • Fuel Tank Capacity: 66 gallons

  • Hydraulic System Capacity: 35 gallons

  • Hydraulic Tank Capacity: 19 gallons

  • Hydraulic Pump Flow: 55.5 gallons per minute

  • Hydraulic Pressure: 4,980 psi

  • Swing Speed: 13.7 rpm

  • Swing Torque: 24,387 lb-ft

  • Travel Speed: 3.4 mph

  • Ground Pressure: Approx. 4.9 psi


Dimensions

  • Overall Length: 25 ft 0 in

  • Transport Height: 9 ft 0 in

  • Transport Width: 8 ft 6 in

  • Ground Clearance: 16 in

  • Tail Swing Radius: 7 ft 0 in

  • Track Width: 28 in

  • Track Gauge: 6 ft 6 in


Working Range

  • Max Digging Depth: 17 ft 10 in (with standard arm)

  • Max Reach at Ground Level: 26 ft 3 in

  • Max Cutting Height: 27 ft 8 in

  • Max Dump Height: 20 ft 5 in


Performance & Design Highlights

  • Mid-size excavator designed for utility, trenching, and small commercial jobs

  • PowerTech diesel engine designed for fuel efficiency and long service intervals

  • Welded boom and arm construction with thick plates for durability

  • Full-vision ROPS cab with climate control and low noise operation

  • Wide-opening engine panels and grouped service points for simplified maintenance

  • Hydraulic system tuned for smooth multi-function operation


Routine Maintenance

  • Engine Oil & Filter: Every 250 hours

  • Fuel Filters: Every 500 hours

  • Hydraulic Filter: Every 1,000 hours

  • Hydraulic Oil: Every 3,000 hours

  • Cooling System: Clean every 250 hours

  • Daily Checks: Grease all pivot points, inspect tracks, check fluid levels, inspect hoses and couplings


Common Issues & Fixes

  • Hydraulic Leaks: Inspect high-pressure hoses and fittings; replace damaged lines and seals

  • Cooling System Clogging: Radiator screens may clog in dusty conditions — clean daily

  • Track Tension Loss: Regularly check tension and adjust using grease adjuster

  • Electrical Faults: Inspect wiring and connectors inside the cab and engine compartment

  • Sluggish Hydraulics: May be due to contaminated fluid or a clogged return filter — replace filter and drain if needed

Out of Stock

This item is OUT OF STOCK and must be special ordered.
Please call us to check availability.

Can’t Find What You’re Looking For?

Our knowledgeable staff will be happy to help you with any of your tractor, backhoe, dozer, or engine parts needs.

1-800-909-7060 Parts Request Form

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Shipping & Return Policy

Do you need your part quickly? You're in luck! We have warehouses all over the country to ensure a quick and easy delivery time. Most of our parts ship from our warehouses the same day you place your order. And many times, orders are delivered in Two to Three days.

Our in house parts are manufactured following strict quality standards in our warehouse in Ohio. Parts such as hydraulic cylinders, pins, bushings, sheet metal, track adjusters, booms and dipper sticks are all ready to ship same day that they are purchased! With less time to wait for your shipment, you will be able to get back to work as quickly as possible.

Did you accidentally purchase the incorrect part? We offer returns and exchanges here at Broken Tractor. To proceed with a return, please call us toll free, and we will provide you with return authorization and a step by step return process for your convenience. We are more than happy to help you exchange your part for the correct one! Give us a call at 1-800-909-7060 and we would be pleased to help you.

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