Machine models

Komatsu PC40 MRx to PC45R-8 specifications

Entries in this reference
Listing-entry count
4

Short answer

Komatsu PC40 MRx to PC45R-8: excavators.

Selected configuration figures
Configuration	Documented field and quantity
PC40 MRx	Net Power 37.8 hp Operating Weight 10,296 lb
PC40MRX-1	Gross Power 38 hp Operating Weight 9,877 lb
PC40R-8	Gross Power 38 hp Operating Weight 9,458 lb
PC45R-8	Net Power 38.8 hp Operating Weight 10,472 lb

PC40 MRx to PC45R-8 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Komatsu	PC40 MRx to PC45R-8	4	PC40 MRx, PC40MRX-1, PC40R-8, and PC45R-8

Boom/Stick Option (Hex) 1
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Shipping Length Of Unit	17.11 ft	17.11 ft	17.85 ft	18 ft
Shipping Height Of Unit	8.5 ft	8.5 ft	8.06 ft	8.4 ft
Max Cutting Height	17.03 ft	17.03 ft	18.43 ft	18.9 ft
Max Loading Height	11.59 ft	11.59 ft	12.87 ft	13.75 ft
Max Reach Along Ground	18.08 ft	18.08 ft	18.25 ft	19.07 ft
Max Vertical Wall Digging Depth	8.86 ft	8.86 ft	8.86 ft	8.54 ft
Max Digging Depth	11.16 ft	11.16 ft	11.16 ft	11.55 ft
Boom/Stick Option (Hex) 1	arm w/ stick 1380mm	Boom 8'10" (2695mm)/Stick 4'6" (1380mm)	Boom 9'0" (2755mm)/Stick 4'6" (1380mm)	2,840mm arm w/ stick 1480mm

Dimensions and weight
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Width To Outside Of Tracks	6.44 ft	6.44 ft	6.57 ft	6.24 ft
Height To Top Of Cab	8.5 ft	8.5 ft	8.35 ft	8.4 ft
Tail Swing Radius	3.48 ft	3.48 ft	4.65 ft	4.83 ft

Specification	PC40MRX-1	PC40R-8	PC45R-8
Length Of Track On Ground	6.37 ft	6.37 ft	6.37 ft
Ground Clearance	1.04 ft	1.02 ft	1.12 ft
Removal Counterweight Clearance	2.1 ft	2.06 ft	2.1 ft

Undercarriage
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Shoe Size	15.75 in	15.75 in	15.75 in	15.75 in
Track Gauge	5.12 ft	5.12 ft	5.25 ft	4.93 ft
Ground Pressure	3.84 psi	3.8 psi	3.6 psi	4.12 psi
Max Travel Speed	2.68 mph	2.68 mph	2.86 mph	2.86 mph

Specification	PC45R-8
Number Of Track Rollers Per Side	5
Number Of Shoes Per Side	38

Engine
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Engine Model	4D84E-3EC	3D84E	4D84E	4D84E-3FA
Power Measured @	2,500 rpm	2,500 rpm	2,500 rpm	2,500 rpm
Displacement	121.8 cu in	121.8 cu in	121.9 cu in	121.8 cu in

Specification	PC40 MRx	PC45R-8
Net Power	37.8 hp	38.8 hp
Aspiration	Natural	Natural

Specification	PC40MRX-1	PC40R-8	PC45R-8
Number Of Cylinders	3	4	4
Gross Power	38 hp	38 hp	44.1 hp

Specification	PC45R-8
Max Torque	87.1 lb-ft
Torque Measured @	1,800 rpm

Operational
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Operating Weight	10,296 lb	9,877 lb	9,458 lb	10,472 lb
Fuel Capacity	15.9 gal	15.9 gal	13.3 gal	13.7 gal
Hydraulic System Fluid Capacity	18 gal	18 gal	8.8 gal	8.8 gal
Hydraulic System Relief Valve Pressure	3,844 psi	3,770 psi	3,560 psi	3,626 psi
Hydraulic Pump Flow Capacity	29.1 gpm	29.1 gpm	35.7 gpm	34.3 gpm

Specification	PC40 MRx	PC45R-8
Cooling System Fluid Capacity	2 gal	2 gal
Engine Oil Capacity	2.3 gal	2.2 gal

Specification	PC45R-8
Operating Voltage	24 V
Alternator Supplied Amperage	40 amps

Swing Mechanism
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Swing Speed	9 rpm	9 rpm	9 rpm	9 rpm

Buckets
Specification	PC40MRX-1	PC40R-8	PC45R-8
Reference Bucket Capacity	0.2 yd3	0.2 yd3	0.3 yd3
Minimum Bucket Capacity	0.1 yd3	0.1 yd3	0.1 yd3
Maximum Bucket Capacity	0.3 yd3	0.3 yd3	0.3 yd3

Variants — Source comparison annotation
Source guide	Differing-field count reported
PC40 MRx to PC45R-8	39

Ratios
Figure	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Engine horsepower per 1,000 lb of weight	3.7	3.8	4.0	3.7
Fuel tank per engine horsepower	0.42 gal	0.42 gal	0.35 gal	0.35 gal
Hydraulic power from the listed pump flow and relief pressure	65.3 hp	64.0 hp	74.1 hp	72.6 hp

Komatsu PC40 MRx to PC45R-8: excavator

PC40 MRx to PC45R-8: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	excavator	Komatsu and the PC40 line that the PC40 MRx, PC40MRX-1, PC40R-8, PC45R-8 belongs to (no title names the exact model)	77

Topics named by those titles
Title topic	Titles
electrical and sensors	10
hydraulics	4
parts and manuals	4

Topic in the title	Threads	Share of matching threads
electrical and sensors	10	13%
hydraulics	4	5%
parts and manuals	4	5%
transmission and drive	2	3%
fuel system	2	3%

Hydraulic Pump Coupler R R Komatsu Pc40 7 (Heavy Equipment Forums, 2026-06-09)
Komatsu Pc40 5 Track Question (Heavy Equipment Forums, 2024-10-09)
Komatsu Pc40 6 Cooling Fan Flow (Heavy Equipment Forums, 2023-03-03)
Komatsu Pc40 Good Machine (Heavy Equipment Forums, 2021-12-31)

Used market for the PC40 MRx to PC45R-8 — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Komatsu excavator	23

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
PC40 MRx	23	2012 to 2023	$8,500	$16,500	$12,000	1,000

PC40 MRx to PC45R-8: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Komatsu together with the excavator PC40 MRx, PC40MRX-1, PC40R-8, PC45R-8	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu PC40 MRx — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu PC40MRX-1 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu PC40R-8 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu PC45R-8 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Komatsu PC40 MRx to PC45R-8 — Heavy Equipment Forums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Komatsu PC40 — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Komatsu — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Komatsu PC40 MRx to PC45R-8: Configuration records

PC40 MRx

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth	8.86 ft
Dimensions and weight
Width To Outside Of Tracks	6.44 ft
Height To Top Of Cab	8.5 ft
Tail Swing Radius	3.48 ft
Undercarriage
Shoe Size	15.75 in
Engine
Engine Model	4D84E-3EC
Net Power	37.8 hp
Power Measured @	2,500 rpm
Displacement	121.8 cu in
Aspiration	Natural
Operational
Fuel Capacity	15.9 gal
Cooling System Fluid Capacity	2 gal
Hydraulic System Fluid Capacity	18 gal
Engine Oil Capacity	2.3 gal
Hydraulic System Relief Valve Pressure	3,844 psi
Hydraulic Pump Flow Capacity	29.1 gpm
Additional specifications
Shipping Length Of Unit	17.11 ft
Max Cutting Height	17.03 ft
Shipping Height Of Unit	8.5 ft
Max Loading Height	11.59 ft
Max Reach Along Ground	18.08 ft
Max Digging Depth	11.16 ft
Boom/Stick Option (Hex) 1	arm w/ stick 1380mm
Track Gauge	5.12 ft
Ground Pressure	3.84 psi
Max Travel Speed	2.68 mph
Operating Weight	10,296 lb
Swing Speed	9 rpm

Source

PC40MRX-1

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth	8.86 ft
Dimensions and weight
Width To Outside Of Tracks	6.44 ft
Length Of Track On Ground	6.37 ft
Height To Top Of Cab	8.5 ft
Tail Swing Radius	3.48 ft
Ground Clearance	1.04 ft
Removal Counterweight Clearance	2.1 ft
Undercarriage
Shoe Size	15.75 in
Engine
Engine Model	3D84E
Power Measured @	2,500 rpm
Displacement	121.8 cu in
Gross Power	38 hp
Number Of Cylinders	3
Operational
Fuel Capacity	15.9 gal
Hydraulic System Fluid Capacity	18 gal
Hydraulic System Relief Valve Pressure	3,770 psi
Hydraulic Pump Flow Capacity	29.1 gpm
Buckets
Reference Bucket Capacity	0.2 yd3
Minimum Bucket Capacity	0.1 yd3
Maximum Bucket Capacity	0.3 yd3
Additional specifications
Shipping Length Of Unit	17.11 ft
Max Cutting Height	17.03 ft
Shipping Height Of Unit	8.5 ft
Max Loading Height	11.59 ft
Max Reach Along Ground	18.08 ft
Max Digging Depth	11.16 ft
Boom/Stick Option (Hex) 1	Boom 8'10" (2695mm)/Stick 4'6" (1380mm)
Track Gauge	5.12 ft
Ground Pressure	3.8 psi
Max Travel Speed	2.68 mph
Operating Weight	9,877 lb
Swing Speed	9 rpm

Source

PC40R-8

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth	8.86 ft
Dimensions and weight
Width To Outside Of Tracks	6.57 ft
Length Of Track On Ground	6.37 ft
Height To Top Of Cab	8.35 ft
Tail Swing Radius	4.65 ft
Ground Clearance	1.02 ft
Removal Counterweight Clearance	2.06 ft
Undercarriage
Shoe Size	15.75 in
Engine
Engine Model	4D84E
Power Measured @	2,500 rpm
Displacement	121.9 cu in
Gross Power	38 hp
Number Of Cylinders	4
Operational
Fuel Capacity	13.3 gal
Hydraulic System Fluid Capacity	8.8 gal
Hydraulic System Relief Valve Pressure	3,560 psi
Hydraulic Pump Flow Capacity	35.7 gpm
Buckets
Reference Bucket Capacity	0.2 yd3
Minimum Bucket Capacity	0.1 yd3
Maximum Bucket Capacity	0.3 yd3
Additional specifications
Shipping Length Of Unit	17.85 ft
Max Cutting Height	18.43 ft
Shipping Height Of Unit	8.06 ft
Max Loading Height	12.87 ft
Max Reach Along Ground	18.25 ft
Max Digging Depth	11.16 ft
Boom/Stick Option (Hex) 1	Boom 9'0" (2755mm)/Stick 4'6" (1380mm)
Track Gauge	5.25 ft
Ground Pressure	3.6 psi
Max Travel Speed	2.86 mph
Operating Weight	9,458 lb
Swing Speed	9 rpm

Source

PC45R-8

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Vertical Wall Digging Depth	8.54 ft
Dimensions and weight
Width To Outside Of Tracks	6.24 ft
Length Of Track On Ground	6.37 ft
Height To Top Of Cab	8.4 ft
Tail Swing Radius	4.83 ft
Ground Clearance	1.12 ft
Removal Counterweight Clearance	2.1 ft
Undercarriage
Shoe Size	15.75 in
Number Of Track Rollers Per Side	5
Number Of Shoes Per Side	38
Engine
Engine Model	4D84E-3FA
Net Power	38.8 hp
Power Measured @	2,500 rpm
Displacement	121.8 cu in
Aspiration	Natural
Gross Power	44.1 hp
Max Torque	87.1 lb-ft
Number Of Cylinders	4
Torque Measured @	1,800 rpm
Operational
Fuel Capacity	13.7 gal
Cooling System Fluid Capacity	2 gal
Hydraulic System Fluid Capacity	8.8 gal
Engine Oil Capacity	2.2 gal
Hydraulic System Relief Valve Pressure	3,626 psi
Hydraulic Pump Flow Capacity	34.3 gpm
Operating Voltage	24 V
Alternator Supplied Amperage	40 amps
Buckets
Reference Bucket Capacity	0.3 yd3
Minimum Bucket Capacity	0.1 yd3
Maximum Bucket Capacity	0.3 yd3
Additional specifications
Shipping Length Of Unit	18 ft
Max Cutting Height	18.9 ft
Shipping Height Of Unit	8.4 ft
Max Loading Height	13.75 ft
Max Reach Along Ground	19.07 ft
Max Digging Depth	11.55 ft
Boom/Stick Option (Hex) 1	2,840mm arm w/ stick 1480mm
Track Gauge	4.93 ft
Ground Pressure	4.12 psi
Max Travel Speed	2.86 mph
Operating Weight	10,472 lb
Swing Speed	9 rpm

Source

Compare Komatsu PC40 MRx, PC40MRX-1, PC40R-8, PC45R-8

Boom/Stick Option (Hex) 1
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Shipping Length Of Unit	17.11 ft	17.11 ft	17.85 ft	18 ft
Shipping Height Of Unit	8.5 ft	8.5 ft	8.06 ft	8.4 ft
Max Cutting Height	17.03 ft	17.03 ft	18.43 ft	18.9 ft
Max Loading Height	11.59 ft	11.59 ft	12.87 ft	13.75 ft
Max Reach Along Ground	18.08 ft	18.08 ft	18.25 ft	19.07 ft
Max Vertical Wall Digging Depth	8.86 ft	8.86 ft	8.86 ft	8.54 ft
Max Digging Depth	11.16 ft	11.16 ft	11.16 ft	11.55 ft
Boom/Stick Option (Hex) 1	arm w/ stick 1380mm	Boom 8'10" (2695mm)/Stick 4'6" (1380mm)	Boom 9'0" (2755mm)/Stick 4'6" (1380mm)	2,840mm arm w/ stick 1480mm

Dimensions and weight
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Width To Outside Of Tracks	6.44 ft	6.44 ft	6.57 ft	6.24 ft
Height To Top Of Cab	8.5 ft	8.5 ft	8.35 ft	8.4 ft
Tail Swing Radius	3.48 ft	3.48 ft	4.65 ft	4.83 ft

Undercarriage
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Shoe Size	15.75 in	15.75 in	15.75 in	15.75 in
Track Gauge	5.12 ft	5.12 ft	5.25 ft	4.93 ft
Ground Pressure	3.84 psi	3.8 psi	3.6 psi	4.12 psi
Max Travel Speed	2.68 mph	2.68 mph	2.86 mph	2.86 mph

Engine
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Engine Model	4D84E-3EC	3D84E	4D84E	4D84E-3FA
Power Measured @	2,500 rpm	2,500 rpm	2,500 rpm	2,500 rpm
Displacement	121.8 cu in	121.8 cu in	121.9 cu in	121.8 cu in

Operational
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Operating Weight	10,296 lb	9,877 lb	9,458 lb	10,472 lb
Fuel Capacity	15.9 gal	15.9 gal	13.3 gal	13.7 gal
Hydraulic System Fluid Capacity	18 gal	18 gal	8.8 gal	8.8 gal
Hydraulic System Relief Valve Pressure	3,844 psi	3,770 psi	3,560 psi	3,626 psi
Hydraulic Pump Flow Capacity	29.1 gpm	29.1 gpm	35.7 gpm	34.3 gpm

Swing Mechanism
Specification	PC40 MRx	PC40MRX-1	PC40R-8	PC45R-8
Swing Speed	9 rpm	9 rpm	9 rpm	9 rpm

More in Komatsu: PC40MR-2/PC45MR-3/PC50MR-2 specs, PC40-2, PC58UU-3.

Komatsu PC40 MRx to PC45R-8 specifications

Komatsu PC40 MRx to PC45R-8: excavator

Sources for this page

Komatsu PC40 MRx to PC45R-8: Configuration records