Machine models

Kubota R420S and R520S Wheel Loader specifications

Entries in this reference
Listing-entry count
2

Short answer

Kubota R420S and R520S Wheel Loader: wheel loaders.

Selected configuration figures
Configuration	Documented field and quantity
R420S	Net Power 39.5 hp Operating Weight 6,724 lb
R520S	Net Power 44.4 hp Operating Weight 8,025 lb

R420S and R520S Wheel Loader specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Kubota	R420S and R520S Wheel Loader	2	R420S and R520S

Bucket
Specification	R420S	R520S
Dump Clearance At Max Raise	7.27 ft	8.67 ft
Bucket Width	4.99 ft	5.78 ft
Bucket Capacity - Heaped	0.53 yd3	0.75 yd3

Dimensions and weight
Specification	R420S	R520S
Ground Clearance	0.94 ft	1.07 ft
Length With Bucket On Ground	13.69 ft	15.23 ft
Width Over Tires	4.93 ft	4.93 ft
Height To Top Of Cab	8.16 ft	8.47 ft
Wheelbase	5.83 ft	6.4 ft
Reach At Max Lift And Dump	2.51 ft	2.58 ft

Engine
Specification	R420S	R520S
Number Of Cylinders	3	4
Engine Model	D1503-TRP-1	V2203-RP
Net Power	39.5 hp	44.4 hp
Power Measured @	2,600 rpm	2,600 rpm
Displacement	91.6 cu in	134.3 cu in

Operational
Specification	R420S	R520S
Operating Weight	6,724 lb	8,025 lb
Static Tipping Weight	3,536 lb	3,977 lb
Turning Radius	10.2 ft	11.2 ft
Tire Size	12.5/70x16-8PR	15.5/60x18-8PR

Transmission and speeds
Specification	R420S	R520S
Number Of Forward Gears	2	2
Number Of Reverse Gears	2	2
Max Speed - Forward	12.5 mph	12.5 mph
Max Speed - Reverse	12.5 mph	12.5 mph

Variants — Source comparison annotation
Source guide	Differing-field count reported
R420S and R520S Wheel Loader	16

Ratios
Figure	R420S	R520S
Engine horsepower per 1,000 lb of weight	5.9	5.5

R420S and R520S Wheel Loader: owner reports

Related account: “Tipping load, use as a yard machine and quick coupler welds”: R420S and R520S Backhoe.

R420S and R520S Wheel Loader: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums and TractorByNet	wheel loader	Kubota and the R420S Wheel Loader, R520S Wheel Loader. That is too few titles to say what owners mostly ask about, so the most recent are listed instead	4

Kubota R520s Pros Cons (Heavy Equipment Forums, 2015-03-25)
Kubota R520s Quick Coupler (TractorByNet, 2009-04-02)
Kubota R420s R520s (TractorByNet, 2006-01-23)

Used market for the R420S and R520S Wheel Loader — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Kubota wheel loader	3

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
R420S Wheel Loader	3	2004 to 2007	$19,700	$24,745	$22,223	2,001

R420S and R520S Wheel Loader: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Kubota together with the wheel loader R420S, R520S	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Kubota R420S — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Kubota R520S — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Kubota R420S and R520S Wheel Loader — Heavy Equipment Forums. Observed 2026-09-24.
Forum threads	Forum threads: TractorByNet thread index for Kubota R420S and R520S Wheel Loader — TractorByNet. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Kubota R420S — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Kubota — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Recorded observations — Forum-title snapshot
Observation field	Recorded value
Title count	4
Forum indexes	Heavy Equipment Forums and TractorByNet
Search wording	the R420S and R520S Wheel Loader wheel loader
Latest title quoted by the reference	Kubota R520s Pros Cons

Kubota R420S and R520S Wheel Loader: Configuration records

R420S

Specification	Source figure
Bucket
Dump Clearance At Max Raise	7.27 ft
Bucket Width	4.99 ft
Bucket Capacity - Heaped	0.53 yd3
Dimensions and weight
Ground Clearance	0.94 ft
Wheelbase	5.83 ft
Reach At Max Lift And Dump	2.51 ft
Length With Bucket On Ground	13.69 ft
Width Over Tires	4.93 ft
Height To Top Of Cab	8.16 ft
Engine
Number Of Cylinders	3
Engine Model	D1503-TRP-1
Power Measured @	2,600 rpm
Displacement	91.6 cu in
Net Power	39.5 hp
Operational
Operating Weight	6,724 lb
Static Tipping Weight	3,536 lb
Turning Radius	10.2 ft
Tire Size	12.5/70x16-8PR
Transmission and speeds
Number Of Forward Gears	2
Number Of Reverse Gears	2
Max Speed - Forward	12.5 mph
Max Speed - Reverse	12.5 mph

R520S

Specification	Source figure
Bucket
Dump Clearance At Max Raise	8.67 ft
Bucket Width	5.78 ft
Bucket Capacity - Heaped	0.75 yd3
Dimensions and weight
Ground Clearance	1.07 ft
Wheelbase	6.4 ft
Reach At Max Lift And Dump	2.58 ft
Length With Bucket On Ground	15.23 ft
Width Over Tires	4.93 ft
Height To Top Of Cab	8.47 ft
Engine
Number Of Cylinders	4
Engine Model	V2203-RP
Power Measured @	2,600 rpm
Displacement	134.3 cu in
Net Power	44.4 hp
Operational
Operating Weight	8,025 lb
Static Tipping Weight	3,977 lb
Turning Radius	11.2 ft
Tire Size	15.5/60x18-8PR
Transmission and speeds
Number Of Forward Gears	2
Number Of Reverse Gears	2
Max Speed - Forward	12.5 mph
Max Speed - Reverse	12.5 mph

More in Kubota: R530–R630C, R310, R430/R540/R640.