Machine models

Kobelco 50SR ACERA to SK55SR-5 specifications

Entries in this reference
Listing-entry count
4

Short answer

Kobelco 50SR ACERA to SK55SR-5: excavators.

Selected configuration figures
Configuration	Documented field and quantity
50SR ACERA	Net Power 39.3 hp Operating Weight 10,274 lb
50SR-3	Net Power 40.8 hp Operating Weight 10,695 lb
SK40SR-5	Gross Power 39.3 hp Operating Weight 9,260 lb
SK55SR-5	Gross Power 39.3 hp Operating Weight 11,288 lb

50SR ACERA to SK55SR-5 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Kobelco	50SR ACERA to SK55SR-5	4	50SR ACERA, 50SR-3, SK40SR-5, and SK55SR-5

Boom/Stick Option (Hex) 1
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Shipping Length Of Unit	17.16 ft	17.16 ft	16.41 ft	17.16 ft
Shipping Height Of Unit	8.54 ft	8.54 ft	8.54 ft	8.6 ft
Max Loading Height	13.42 ft	13.42 ft	11.88 ft	12.08 ft
Max Reach Along Ground	18.87 ft	18.87 ft	18.08 ft	18.87 ft
Max Vertical Wall Digging Depth	9.22 ft	9.22 ft	8.63 ft	9.22 ft
Max Digging Depth	11.78 ft	11.78 ft	11.13 ft	11.78 ft

Specification	50SR ACERA	50SR-3
Max Cutting Height	18.61 ft	18.61 ft
Boom/Stick Option (Hex) 1	Boom 9\'2\" (2790mm) / Stick 5\'1\" (1560mm)	Stick 5\'1\" (1560mm)

Dimensions and weight
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Width To Outside Of Tracks	6.57 ft	6.44 ft	6.44 ft	6.44 ft
Length Of Track On Ground	6.47 ft	6.47 ft	5.98 ft	6.47 ft
Ground Clearance	1.14 ft	1.14 ft	1.14 ft	1.14 ft
Tail Swing Radius	3.22 ft	3.22 ft	3.22 ft	3.55 ft

Specification	50SR ACERA	50SR-3
Height To Top Of Cab	8.54 ft	8.54 ft
Removal Counterweight Clearance	2.09 ft	2.09 ft

Undercarriage
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Shoe Size	15.75 in	15.75 in	15.75 in	15.75 in
Max Travel Speed	2.86 mph	2.9 mph	2.86 mph	2.86 mph

Specification	50SR ACERA	50SR-3
Track Gauge	5.12 ft	5.12 ft
Ground Pressure	3.92 psi	3.92 psi

Specification	50SR-3
Drawbar Pull	12,185 lb

Engine
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Number Of Cylinders	4	4	4	4
Engine Model	4TNV88-BXYB	4TNV88-XYB	4TNV88	4TNV88
Power Measured @	2,400 rpm	2,400 rpm	2,400 rpm	2,400 rpm
Displacement	133.6 cu in	133.6 cu in	133.1 cu in	133.1 cu in

Specification	50SR ACERA	50SR-3
Net Power	39.3 hp	40.8 hp

Specification	50SR ACERA
Max Torque	96.8 lb-ft
Torque Measured @	1,440 rpm

Specification	SK40SR-5	SK55SR-5
Gross Power	39.3 hp	39.3 hp

Operational
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Operating Weight	10,274 lb	10,695 lb	9,260 lb	11,288 lb
Hydraulic System Relief Valve Pressure	3,336 psi	3,336 psi	3,336 psi	3,336 psi
Hydraulic Pump Flow Capacity	30.2 gpm	42.1 gpm	34.4 gpm	35.7 gpm

Specification	50SR ACERA	50SR-3
Fuel Capacity	14.1 gal	14 gal
Hydraulic System Fluid Capacity	16.7 gal	16.7 gal
Alternator Supplied Amperage	55 amps	40 amps

Specification	50SR ACERA
Cooling System Fluid Capacity	1.6 gal
Engine Oil Capacity	2 gal
Operational Voltage	12 V

Specification	50SR-3
Operating Voltage	12 V

Swing Mechanism
Specification	50SR ACERA	50SR-3
Swing Speed	8.8 rpm	8.8 rpm
Swing Torque	966 lb-ft	966 lb-ft

Buckets
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Reference Bucket Capacity	0.4 yd3	0.3 yd3	0.2 yd3	0.2 yd3

Specification	50SR ACERA
Minimum Bucket Capacity	0.2 yd3
Maximum Bucket Capacity	0.5 yd3

Variants — Source comparison annotation
Source guide	Differing-field count reported
50SR ACERA to SK55SR-5	37

Ratios
Figure	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Engine horsepower per 1,000 lb of weight	3.8	3.8	4.2	3.5
Hydraulic power from the listed pump flow and relief pressure	58.8 hp	81.9 hp	67.0 hp	69.5 hp

Figure	50SR ACERA	50SR-3
Fuel tank per engine horsepower	0.36 gal	0.34 gal

Kobelco 50SR ACERA to SK55SR-5: excavator

50SR ACERA to SK55SR-5: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	excavator	Kobelco and the 50SR, SK40SR line that the 50SR ACERA, 50SR-3, SK40SR-5, SK55SR-5 belongs to (no title names the exact model). That is too few titles to say what owners mostly ask about, so the most recent are listed instead	5

Kobelco Sk40sr 3 Slewing Motor Adjustment (Heavy Equipment Forums, 2021-04-18)
Kabelco Sk55sr 5 Excavator Turning Off Intermittently (Heavy Equipment Forums, 2016-02-10)
Kobelco 50sr Weak Right Drive Motor (Heavy Equipment Forums, 2011-01-30)
Kobelco Grey Market Sk40sr Mini Excavator Idler Assembly Parts (Heavy Equipment Forums, 2010-09-27)

Used market for the 50SR ACERA to SK55SR-5 — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Kobelco excavator	4

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
SK40SR-5	1	2011	$24,630	$24,630	$24,630	3,700
SK55SR-5	3	2015 to 2021	$11,900	$12,300	$12,000	None shown

50SR ACERA to SK55SR-5: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Kobelco together with the excavator 50SR ACERA, 50SR-3, SK40SR-5, SK55SR-5	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Kobelco 50SR ACERA — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Kobelco 50SR-3 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Kobelco SK40SR-5 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Kobelco SK55SR-5 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Kobelco 50SR ACERA to SK55SR-5 — Heavy Equipment Forums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Kobelco SK40SR-5 — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Kobelco — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Recorded observations — Forum-title snapshot
Observation field	Recorded value
Title count	5
Forum indexes	Heavy Equipment Forums
Search wording	the 50SR ACERA to SK55SR-5 excavator
Latest title quoted by the reference	Kobelco Sk40sr 3 Slewing Motor Adjustment

Kobelco 50SR ACERA to SK55SR-5: Configuration records

50SR ACERA

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	17.16 ft
Max Cutting Height	18.61 ft
Shipping Height Of Unit	8.54 ft
Max Loading Height	13.42 ft
Max Reach Along Ground	18.87 ft
Max Vertical Wall Digging Depth	9.22 ft
Max Digging Depth	11.78 ft
Boom/Stick Option (Hex) 1	Boom 9'2" (2790mm) / Stick 5'1" (1560mm)
Dimensions and weight
Width To Outside Of Tracks	6.57 ft
Length Of Track On Ground	6.47 ft
Height To Top Of Cab	8.54 ft
Tail Swing Radius	3.22 ft
Ground Clearance	1.14 ft
Removal Counterweight Clearance	2.09 ft
Undercarriage
Shoe Size	15.75 in
Ground Pressure	3.92 psi
Max Travel Speed	2.86 mph
Engine
Number Of Cylinders	4
Engine Model	4TNV88-BXYB
Net Power	39.3 hp
Power Measured @	2,400 rpm
Displacement	133.6 cu in
Max Torque	96.8 lb-ft
Torque Measured @	1,440 rpm
Operational
Operating Weight	10,274 lb
Fuel Capacity	14.1 gal
Cooling System Fluid Capacity	1.6 gal
Hydraulic System Fluid Capacity	16.7 gal
Engine Oil Capacity	2 gal
Operational Voltage	12 V
Alternator Supplied Amperage	55 amps
Hydraulic System Relief Valve Pressure	3,336 psi
Hydraulic Pump Flow Capacity	30.2 gpm
Swing Mechanism
Swing Speed	8.8 rpm
Swing Torque	966 lb-ft
Buckets
Reference Bucket Capacity	0.4 yd3
Minimum Bucket Capacity	0.2 yd3
Maximum Bucket Capacity	0.5 yd3
Additional specifications
Track Gauge	5.12 ft

Source

50SR-3

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	17.16 ft
Max Cutting Height	18.61 ft
Shipping Height Of Unit	8.54 ft
Max Loading Height	13.42 ft
Max Reach Along Ground	18.87 ft
Max Vertical Wall Digging Depth	9.22 ft
Max Digging Depth	11.78 ft
Boom/Stick Option (Hex) 1	Stick 5'1" (1560mm)
Dimensions and weight
Width To Outside Of Tracks	6.44 ft
Length Of Track On Ground	6.47 ft
Height To Top Of Cab	8.54 ft
Tail Swing Radius	3.22 ft
Ground Clearance	1.14 ft
Removal Counterweight Clearance	2.09 ft
Undercarriage
Shoe Size	15.75 in
Ground Pressure	3.92 psi
Max Travel Speed	2.9 mph
Drawbar Pull	12,185 lb
Engine
Number Of Cylinders	4
Engine Model	4TNV88-XYB
Net Power	40.8 hp
Power Measured @	2,400 rpm
Displacement	133.6 cu in
Operational
Operating Weight	10,695 lb
Fuel Capacity	14 gal
Hydraulic System Fluid Capacity	16.7 gal
Alternator Supplied Amperage	40 amps
Hydraulic System Relief Valve Pressure	3,336 psi
Hydraulic Pump Flow Capacity	42.1 gpm
Operating Voltage	12 V
Swing Mechanism
Swing Speed	8.8 rpm
Swing Torque	966 lb-ft
Buckets
Reference Bucket Capacity	0.3 yd3
Additional specifications
Track Gauge	5.12 ft

Source

SK40SR-5

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	16.41 ft
Shipping Height Of Unit	8.54 ft
Max Loading Height	11.88 ft
Max Reach Along Ground	18.08 ft
Max Vertical Wall Digging Depth	8.63 ft
Max Digging Depth	11.13 ft
Dimensions and weight
Width To Outside Of Tracks	6.44 ft
Length Of Track On Ground	5.98 ft
Tail Swing Radius	3.22 ft
Ground Clearance	1.14 ft
Undercarriage
Shoe Size	15.75 in
Max Travel Speed	2.86 mph
Engine
Number Of Cylinders	4
Engine Model	4TNV88
Power Measured @	2,400 rpm
Displacement	133.1 cu in
Gross Power	39.3 hp
Operational
Operating Weight	9,260 lb
Hydraulic System Relief Valve Pressure	3,336 psi
Hydraulic Pump Flow Capacity	34.4 gpm
Buckets
Reference Bucket Capacity	0.2 yd3

Source

SK55SR-5

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	17.16 ft
Shipping Height Of Unit	8.6 ft
Max Loading Height	12.08 ft
Max Reach Along Ground	18.87 ft
Max Vertical Wall Digging Depth	9.22 ft
Max Digging Depth	11.78 ft
Dimensions and weight
Width To Outside Of Tracks	6.44 ft
Length Of Track On Ground	6.47 ft
Tail Swing Radius	3.55 ft
Ground Clearance	1.14 ft
Undercarriage
Shoe Size	15.75 in
Max Travel Speed	2.86 mph
Engine
Number Of Cylinders	4
Engine Model	4TNV88
Power Measured @	2,400 rpm
Displacement	133.1 cu in
Gross Power	39.3 hp
Operational
Operating Weight	11,288 lb
Hydraulic System Relief Valve Pressure	3,336 psi
Hydraulic Pump Flow Capacity	35.7 gpm
Buckets
Reference Bucket Capacity	0.2 yd3

Source

Compare Kobelco 50SR ACERA, 50SR-3, SK40SR-5, SK55SR-5

Boom/Stick Option (Hex) 1
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Shipping Length Of Unit	17.16 ft	17.16 ft	16.41 ft	17.16 ft
Shipping Height Of Unit	8.54 ft	8.54 ft	8.54 ft	8.6 ft
Max Loading Height	13.42 ft	13.42 ft	11.88 ft	12.08 ft
Max Reach Along Ground	18.87 ft	18.87 ft	18.08 ft	18.87 ft
Max Vertical Wall Digging Depth	9.22 ft	9.22 ft	8.63 ft	9.22 ft
Max Digging Depth	11.78 ft	11.78 ft	11.13 ft	11.78 ft

Dimensions and weight
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Width To Outside Of Tracks	6.57 ft	6.44 ft	6.44 ft	6.44 ft
Length Of Track On Ground	6.47 ft	6.47 ft	5.98 ft	6.47 ft
Ground Clearance	1.14 ft	1.14 ft	1.14 ft	1.14 ft
Tail Swing Radius	3.22 ft	3.22 ft	3.22 ft	3.55 ft

Undercarriage
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Shoe Size	15.75 in	15.75 in	15.75 in	15.75 in
Max Travel Speed	2.86 mph	2.9 mph	2.86 mph	2.86 mph

Engine
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Number Of Cylinders	4	4	4	4
Engine Model	4TNV88-BXYB	4TNV88-XYB	4TNV88	4TNV88
Power Measured @	2,400 rpm	2,400 rpm	2,400 rpm	2,400 rpm
Displacement	133.6 cu in	133.6 cu in	133.1 cu in	133.1 cu in

Operational
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Operating Weight	10,274 lb	10,695 lb	9,260 lb	11,288 lb
Hydraulic System Relief Valve Pressure	3,336 psi	3,336 psi	3,336 psi	3,336 psi
Hydraulic Pump Flow Capacity	30.2 gpm	42.1 gpm	34.4 gpm	35.7 gpm

Buckets
Specification	50SR ACERA	50SR-3	SK40SR-5	SK55SR-5
Reference Bucket Capacity	0.4 yd3	0.3 yd3	0.2 yd3	0.2 yd3

More in Kobelco: SK210LC-9, SK45SRX-6E/SK55SRX-6E specs, SK27SR-5/SK35SR-5.

Kobelco 50SR ACERA to SK55SR-5 specifications

Kobelco 50SR ACERA to SK55SR-5: excavator

Sources for this page

Kobelco 50SR ACERA to SK55SR-5: Configuration records