Machine models

Kobelco SK45SRX-6E and SK55SRX-6E specifications

Entries in this reference
Listing-entry count
2

Short answer

Kobelco SK45SRX-6E and SK55SRX-6E: excavators.

Selected configuration figures
Configuration	Documented field and quantity
SK45SRX-6E	Net Power 37.4 hp Operating Weight 10,300 lb
SK55SRX-6E	Net Power 37.4 hp Operating Weight 11,600 lb

SK45SRX-6E and SK55SRX-6E specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Kobelco	SK45SRX-6E and SK55SRX-6E	2	SK45SRX-6E and SK55SRX-6E

Boom/Stick Option (Hex) 1
Specification	SK45SRX-6E	SK55SRX-6E
Shipping Length Of Unit	17.4 ft	18.11 ft
Max Cutting Height	18.7 ft	19.5 ft
Shipping Height Of Unit	8.4 ft	8.4 ft
Max Loading Height	13.5 ft	14.3 ft
Max Reach Along Ground	18.8 ft	20 ft
Max Vertical Wall Digging Depth	9.31 ft	10.4 ft
Max Digging Depth	11.3 ft	12.1 ft
Arm Crowding Force - SAE	4,474 lb	5,328 lb
Boom/Stick Option (Hex) 1	Mono Boom	Mono Boom
Bucket Digging Force - SAE	6,992 lb	6,992 lb

Dimensions and weight
Specification	SK45SRX-6E	SK55SRX-6E
Width To Outside Of Tracks	6.5 ft	6.5 ft
Length Of Track On Ground	17.4 ft	18.11 ft
Height To Top Of Cab	8.4 ft	8.4 ft
Tail Swing Radius	3.1 ft	4.2 ft

Undercarriage
Specification	SK45SRX-6E	SK55SRX-6E
Shoe Size	15.7 in	15.7 in
Ground Pressure	3.81 psi	3.81 psi
Number Of Track Rollers Per Side	5	5
Max Travel Speed	2.5 mph	2.5 mph

Engine
Specification	SK45SRX-6E	SK55SRX-6E
Number Of Cylinders	4	4
Engine Model	YANMAR 4TNV88C-PYB	YANMAR 4TNV88C-PYB
Engine Type	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine
Net Power	37.4 hp	37.4 hp
Power Measured @	2,400 rpm	2,400 rpm
Displacement	133.6 cu in	133.6 cu in
Max Torque	97.3 lb-ft	97.3 lb-ft
Torque Measured @	1,560 rpm	1,560 rpm

Operational
Specification	SK45SRX-6E	SK55SRX-6E
Operating Weight	10,300 lb	11,600 lb
Fuel Capacity	19.9 gal	19.9 gal
Traction Force	12,390 lb	12,342 lb

Swing Mechanism
Specification	SK45SRX-6E	SK55SRX-6E
Swing Motor	Axial piston motor	Axial piston motor
Swing Speed	8.5 rpm	8.5 rpm

Buckets
Specification	SK45SRX-6E	SK55SRX-6E
Reference Bucket Capacity	0.1 yd3	0.1 yd3

Hydraulic System
Specification	SK45SRX-6E	SK55SRX-6E
Relief Valve Setting	3,335 (23.0) (psi (MPa))	3,335 (23.0) (psi (MPa))
Maximum Oil Flow	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))
Pump Type	Two variable displacement pumps+ two gear pumps	Two variable displacement pumps+ two gear pumps

Variants — Source comparison annotation
Source guide	Differing-field count reported
SK45SRX-6E and SK55SRX-6E	11

Ratios
Figure	SK45SRX-6E	SK55SRX-6E
Engine horsepower per 1,000 lb of weight	3.6	3.2
Fuel tank per engine horsepower	0.53 gal	0.53 gal

Kobelco SK45SRX-6E and SK55SRX-6E: excavator

SK45SRX-6E and SK55SRX-6E: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	excavator	Kobelco and the SK45SRX, SK55SRX line that the SK45SRX-6E, SK55SRX-6E 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	3

Sk45srx 6 Swing One Way Only (Heavy Equipment Forums, 2025-06-25)
Kobelco Sk45srx 7 Swing Speed Issues (Heavy Equipment Forums, 2024-01-12)
Kobelco Sk55srx Vs Takeuchi Tb260 (Heavy Equipment Forums, 2022-03-06)

Used market for the SK45SRX-6E and SK55SRX-6E — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Kobelco excavator	16

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
SK45SRX-6E	4	2019 to 2021	$22,000	$65,000	$47,671	1,198
SK55SRX-6E	12	2014 to 2023	$15,000	$63,459	$43,000	1,750

SK45SRX-6E and SK55SRX-6E: 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 SK45SRX-6E, SK55SRX-6E	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Kobelco SK45SRX-6E — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Kobelco SK55SRX-6E — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Kobelco SK45SRX-6E and SK55SRX-6E — Heavy Equipment Forums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Kobelco SK45SRX-6E — 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	3
Forum indexes	Heavy Equipment Forums
Search wording	the SK45SRX-6E and SK55SRX-6E excavator
Latest title quoted by the reference	Sk45srx 6 Swing One Way Only

Kobelco SK45SRX-6E and SK55SRX-6E: Configuration records

SK45SRX-6E

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	17.4 ft
Max Cutting Height	18.7 ft
Shipping Height Of Unit	8.4 ft
Max Loading Height	13.5 ft
Max Reach Along Ground	18.8 ft
Max Vertical Wall Digging Depth	9.31 ft
Max Digging Depth	11.3 ft
Arm Crowding Force - SAE	4,474 lb
Boom/Stick Option (Hex) 1	Mono Boom
Bucket Digging Force - SAE	6,992 lb
Dimensions and weight
Width To Outside Of Tracks	6.5 ft
Length Of Track On Ground	17.4 ft
Height To Top Of Cab	8.4 ft
Tail Swing Radius	3.1 ft
Undercarriage
Shoe Size	15.7 in
Ground Pressure	3.81 psi
Number Of Track Rollers Per Side	5
Max Travel Speed	2.5 mph
Engine
Number Of Cylinders	4
Engine Model	YANMAR 4TNV88C-PYB
Engine Type	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine
Net Power	37.4 hp
Power Measured @	2,400 rpm
Displacement	133.6 cu in
Max Torque	97.3 lb-ft
Torque Measured @	1,560 rpm
Operational
Operating Weight	10,300 lb
Fuel Capacity	19.9 gal
Traction Force	12,390 lb
Swing Mechanism
Swing Motor	Axial piston motor
Swing Speed	8.5 rpm
Buckets
Reference Bucket Capacity	0.1 yd3
Hydraulic System
Relief Valve Setting	3,335 (23.0) (psi (MPa))
Maximum Oil Flow	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))
Pump Type	Two variable displacement pumps+ two gear pumps

Source

SK55SRX-6E

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	18.11 ft
Max Cutting Height	19.5 ft
Shipping Height Of Unit	8.4 ft
Max Loading Height	14.3 ft
Max Reach Along Ground	20 ft
Max Vertical Wall Digging Depth	10.4 ft
Max Digging Depth	12.1 ft
Arm Crowding Force - SAE	5,328 lb
Boom/Stick Option (Hex) 1	Mono Boom
Bucket Digging Force - SAE	6,992 lb
Dimensions and weight
Width To Outside Of Tracks	6.5 ft
Length Of Track On Ground	18.11 ft
Height To Top Of Cab	8.4 ft
Tail Swing Radius	4.2 ft
Undercarriage
Shoe Size	15.7 in
Ground Pressure	3.81 psi
Number Of Track Rollers Per Side	5
Max Travel Speed	2.5 mph
Engine
Number Of Cylinders	4
Engine Model	YANMAR 4TNV88C-PYB
Engine Type	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine
Net Power	37.4 hp
Power Measured @	2,400 rpm
Displacement	133.6 cu in
Max Torque	97.3 lb-ft
Torque Measured @	1,560 rpm
Operational
Operating Weight	11,600 lb
Fuel Capacity	19.9 gal
Traction Force	12,342 lb
Swing Mechanism
Swing Motor	Axial piston motor
Swing Speed	8.5 rpm
Buckets
Reference Bucket Capacity	0.1 yd3
Hydraulic System
Relief Valve Setting	3,335 (23.0) (psi (MPa))
Maximum Oil Flow	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))
Pump Type	Two variable displacement pumps+ two gear pumps

Source

Compare Kobelco SK45SRX-6E, SK55SRX-6E

Boom/Stick Option (Hex) 1
Specification	SK45SRX-6E	SK55SRX-6E
Shipping Length Of Unit	17.4 ft	18.11 ft
Max Cutting Height	18.7 ft	19.5 ft
Shipping Height Of Unit	8.4 ft	8.4 ft
Max Loading Height	13.5 ft	14.3 ft
Max Reach Along Ground	18.8 ft	20 ft
Max Vertical Wall Digging Depth	9.31 ft	10.4 ft
Max Digging Depth	11.3 ft	12.1 ft
Arm Crowding Force - SAE	4,474 lb	5,328 lb
Boom/Stick Option (Hex) 1	Mono Boom	Mono Boom
Bucket Digging Force - SAE	6,992 lb	6,992 lb

Dimensions and weight
Specification	SK45SRX-6E	SK55SRX-6E
Width To Outside Of Tracks	6.5 ft	6.5 ft
Length Of Track On Ground	17.4 ft	18.11 ft
Height To Top Of Cab	8.4 ft	8.4 ft
Tail Swing Radius	3.1 ft	4.2 ft

Undercarriage
Specification	SK45SRX-6E	SK55SRX-6E
Shoe Size	15.7 in	15.7 in
Ground Pressure	3.81 psi	3.81 psi
Number Of Track Rollers Per Side	5	5
Max Travel Speed	2.5 mph	2.5 mph

Engine
Specification	SK45SRX-6E	SK55SRX-6E
Number Of Cylinders	4	4
Engine Model	YANMAR 4TNV88C-PYB	YANMAR 4TNV88C-PYB
Engine Type	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine	Water cooled, 4-cycle, 4-cylinder, direct injection, diesel engine
Net Power	37.4 hp	37.4 hp
Power Measured @	2,400 rpm	2,400 rpm
Displacement	133.6 cu in	133.6 cu in
Max Torque	97.3 lb-ft	97.3 lb-ft
Torque Measured @	1,560 rpm	1,560 rpm

Operational
Specification	SK45SRX-6E	SK55SRX-6E
Operating Weight	10,300 lb	11,600 lb
Fuel Capacity	19.9 gal	19.9 gal
Traction Force	12,390 lb	12,342 lb

Swing Mechanism
Specification	SK45SRX-6E	SK55SRX-6E
Swing Motor	Axial piston motor	Axial piston motor
Swing Speed	8.5 rpm	8.5 rpm

Buckets
Specification	SK45SRX-6E	SK55SRX-6E
Reference Bucket Capacity	0.1 yd3	0.1 yd3

Hydraulic System
Specification	SK45SRX-6E	SK55SRX-6E
Relief Valve Setting	3,335 (23.0) (psi (MPa))	3,335 (23.0) (psi (MPa))
Maximum Oil Flow	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))	2 x 13.2 (49.9), 8.9 (33.8), 2.9 (10.8) (gpm (L/min))
Pump Type	Two variable displacement pumps+ two gear pumps	Two variable displacement pumps+ two gear pumps

More in Kobelco: 50SR ACERA–SK55SR-5, 30SR-3–SK30SR-5, SK210LC-9.

Kobelco SK45SRX-6E and SK55SRX-6E specifications

Kobelco SK45SRX-6E and SK55SRX-6E: excavator

Sources for this page

Kobelco SK45SRX-6E and SK55SRX-6E: Configuration records