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Kubota KX121-3 and U45 specifications

Entries in this reference
Listing-entry count
2
Short answer

Kubota KX121-3 and U45: excavators.

Selected configuration figures
ConfigurationDocumented field and quantity
KX121-3
Net Power
42 hp
Operating Weight
9,063 lb
U45
Net Power
42 hp
Operating Weight
11,850 lb
KX121-3 and U45 specification matrix — Listing labels reported by the source
Publisher nameSource guideListing-entry countLabels named by the source
KubotaKX121-3 and U452KX121-3 and U45
Boom/Stick Option (Hex) 1
SpecificationKX121-3U45
Shipping Length Of Unit16.7 ft18.18 ft
Max Cutting Height17.78 ft18.12 ft
Shipping Height Of Unit8.19 ft8.34 ft
Max Loading Height12.76 ft13.03 ft
Max Reach Along Ground17.97 ft19.28 ft
Max Vertical Wall Digging Depth8.14 ft7.88 ft
Max Digging Depth11.5 ft11.82 ft
Dimensions and weight
SpecificationKX121-3U45
Width To Outside Of Tracks5.58 ft6.43 ft
Ground Clearance1.09 ft1.05 ft
Undercarriage
SpecificationKX121-3U45
Max Travel Speed3.1 mph2.7 mph
Ground Pressure4.41 psi4.37 psi
SpecificationU45
Drawbar Pull12,871 lb
Engine
SpecificationKX121-3U45
Engine ModelV2203-MV2203-M
Net Power42 hp42 hp
Power Measured @2,250 rpm2,250 rpm
Displacement134.1 cu in134.4 cu in
SpecificationU45
Number Of Cylinders4
Aspirationliquid-cooled, overhead valve diesel engine
Operational
SpecificationKX121-3U45
Operating Weight9,063 lb11,850 lb
Fuel Capacity16.9 gal18.5 gal
Hydraulic System Fluid Capacity17.7 gal11.6 gal
Hydraulic Pump Flow Capacity25 gpm32.1 gpm
SpecificationU45
Cooling System Fluid Capacity2.3 gal
Engine Oil Capacity2.3 gal
Swing Mechanism
SpecificationKX121-3U45
Swing Speed9.4 rpm9.1 rpm
Variants — Source comparison annotation
Source guideDiffering-field count reported
KX121-3 and U4522
Ratios
FigureKX121-3U45
Engine horsepower per 1,000 lb of weight4.63.5
Fuel tank per engine horsepower0.40 gal0.44 gal

Kubota KX121-3 and U45: excavator

KX121-3 and U45: forum references — Forum-title search
Forum indexEquipment class queriedNames in the searchMatching titles
Heavy Equipment Forums and TractorByNetexcavatorKubota and the KX121-3, U4537
Topics named by those titles
Title topicTitles
hydraulics6
engine power and smoke2
Topic in the titleThreadsShare of matching threads
hydraulics616%
engine power and smoke25%
Used market for the KX121-3 and U45 — Dated first-page listing snapshot
Observation dateListing sourceEquipment searchListings
2026-09-24MachineryTraderKubota excavator18
ModelListedModel yearsLowest askingHighest askingMedian askingMedian hours
KX121-3172004 to 2017$15,230$48,500$30,0004,652
U4511900None shownNone shownNone shownNone shown
KX121-3 and U45: recall reference — Dated CPSC search
Search dateDatabaseNames queriedSearch result
2026-09-24U.S. Consumer Product Safety CommissionKubota together with the excavator KX121-3, U45No matching recall in this search

Sources for this page

Evidence classDocument, classification and recorded date
Reference site
Reference site
  • Reference site: Kubota U45 — RitchieSpecs. Observed 2026-09-24.
Forum threads
Forum threads
Used-market listings
Federal agency data

Kubota KX121-3 and U45: Configuration records

KX121-3
SpecificationSource figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth8.14 ft
Max Digging Depth11.5 ft
Shipping Length Of Unit16.7 ft
Max Cutting Height17.78 ft
Shipping Height Of Unit8.19 ft
Max Loading Height12.76 ft
Max Reach Along Ground17.97 ft
Dimensions and weight
Ground Clearance1.09 ft
Width To Outside Of Tracks5.58 ft
Undercarriage
Max Travel Speed3.1 mph
Engine
Net Power42 hp
Power Measured @2,250 rpm
Displacement134.1 cu in
Operational
Operating Weight9,063 lb
Fuel Capacity16.9 gal
Hydraulic System Fluid Capacity17.7 gal
Hydraulic Pump Flow Capacity25 gpm
Swing Mechanism
Swing Speed9.4 rpm
Additional specifications
Ground Pressure4.41 psi
Engine ModelV2203-M

Source

U45
SpecificationSource figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth7.88 ft
Max Digging Depth11.82 ft
Shipping Length Of Unit18.18 ft
Max Cutting Height18.12 ft
Shipping Height Of Unit8.34 ft
Max Loading Height13.03 ft
Max Reach Along Ground19.28 ft
Dimensions and weight
Ground Clearance1.05 ft
Width To Outside Of Tracks6.43 ft
Undercarriage
Max Travel Speed2.7 mph
Drawbar Pull12,871 lb
Engine
Number Of Cylinders4
Net Power42 hp
Power Measured @2,250 rpm
Displacement134.4 cu in
Aspirationliquid-cooled, overhead valve diesel engine
Operational
Operating Weight11,850 lb
Fuel Capacity18.5 gal
Hydraulic System Fluid Capacity11.6 gal
Hydraulic Pump Flow Capacity32.1 gpm
Cooling System Fluid Capacity2.3 gal
Engine Oil Capacity2.3 gal
Swing Mechanism
Swing Speed9.1 rpm
Additional specifications
Ground Pressure4.37 psi
Engine ModelV2203-M

Source

Compare Kubota KX121-3, U45
Boom/Stick Option (Hex) 1
SpecificationKX121-3U45
Shipping Length Of Unit16.7 ft18.18 ft
Max Cutting Height17.78 ft18.12 ft
Shipping Height Of Unit8.19 ft8.34 ft
Max Loading Height12.76 ft13.03 ft
Max Reach Along Ground17.97 ft19.28 ft
Max Vertical Wall Digging Depth8.14 ft7.88 ft
Max Digging Depth11.5 ft11.82 ft
Dimensions and weight
SpecificationKX121-3U45
Width To Outside Of Tracks5.58 ft6.43 ft
Ground Clearance1.09 ft1.05 ft
Undercarriage
SpecificationKX121-3U45
Max Travel Speed3.1 mph2.7 mph
Ground Pressure4.41 psi4.37 psi
Engine
SpecificationKX121-3U45
Engine ModelV2203-MV2203-M
Net Power42 hp42 hp
Power Measured @2,250 rpm2,250 rpm
Displacement134.1 cu in134.4 cu in
Operational
SpecificationKX121-3U45
Operating Weight9,063 lb11,850 lb
Fuel Capacity16.9 gal18.5 gal
Hydraulic System Fluid Capacity17.7 gal11.6 gal
Hydraulic Pump Flow Capacity25 gpm32.1 gpm
Swing Mechanism
SpecificationKX121-3U45
Swing Speed9.4 rpm9.1 rpm

More in Kubota: U55-4A1–U55-4W1, KX057-5/U48-5/U55-5, KX161-3.