Machine models

Komatsu D85A-21 to D155A-2 specifications

Entries in this reference
Listing-entry count
4

Short answer

Komatsu D85A-21 to D155A-2: crawler dozers.

Selected configuration figures
Configuration	Documented field and quantity
D85A-21	Gross Power 228 hp Operating Weight 53,881 lb
D85E-18	Gross Power 220 hp Operating Weight 42,560 lb
D135A-2	Gross Power 289 hp Operating Weight 65,698 lb
D155A-2	Gross Power 320 hp Operating Weight 76,192 lb

D85A-21 to D155A-2 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Komatsu	D85A-21 to D155A-2	4	D85A-21, D85E-18, D135A-2, and D155A-2

Dimensions and weight
Specification	D85A-21	D135A-2	D155A-2
Length W/ Blade	22.41 ft	26.17 ft	21.53 ft

Specification	D85A-21	D85E-18	D135A-2	D155A-2
Width Over Tracks	8.6 ft	8.6 ft	9.11 ft	7.03 ft
Height To Top Of Cab	11.09 ft	11.14 ft	11.49 ft	12.31 ft
Length Of Track On Ground	9.32 ft	8.96 ft	10.14 ft	10.34 ft
Ground Clearance	1.37 ft	1.33 ft	1.51 ft	1.65 ft
Length W/O Blade	15.52 ft	14.39 ft	16.25 ft	17.72 ft

Undercarriage
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Track Gauge	6.57 ft	6.57 ft	6.89 ft	7.03 ft
Standard Shoe Size	22.05 in	22.05 in	22.05 in	22.05 in
Number Of Track Rollers Per Side	7	7	7	7

Specification	D85A-21	D135A-2	D155A-2
Number Of Shoes Per Side	39	40	41
Number Of Carrier Rollers Per Side	2	2	2
Track Pitch	8.51 in	9 in	9 in

Specification	D85A-21	D85E-18
Ground Pressure	8.4 psi	7.9 psi

Specification	D85A-21
Ground Contact Area	4,931 in2

Engine
Specification	D85A-21	D135A-2	D155A-2
Number Of Cylinders	6	6	6
Power Measured @	2,000 rpm	2,000 rpm	2,000 rpm

Specification	D85A-21	D85E-18	D135A-2	D155A-2
Engine Model	S6D125E	NT-855	S6D140	S6D155-4
Gross Power	228 hp	220 hp	289 hp	320 hp
Displacement	930.1 cu in	855 cu in	930.1 cu in	1,175 cu in

Specification	D85A-21	D85E-18	D155A-2
Max Torque	737.3 lb-ft	759 lb-ft	1,040 lb-ft
Aspiration	Turbocharged	turbocharged	turbocharged

Specification	D85A-21	D155A-2
Torque Measured @	1,400 rpm	1,400 rpm

Operational
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Operating Weight	53,881 lb	42,560 lb	65,698 lb	76,192 lb

Specification	D85A-21	D85E-18	D155A-2
Fuel Capacity	126.9 gal	118.9 gal	158.6 gal
Cooling System Fluid Capacity	20.9 gal	20.9 gal	43.6 gal

Specification	D85A-21	D155A-2
Engine Oil Capacity	7.2 gal	15.1 gal
Powertrain Fluid Capacity	23.8 gal	36 gal
Final Drives Fluid Capacity	10.9 gal	14.6 gal
Operating Voltage	24 V	24 V

Specification	D85A-21
Hydraulic Fluid Capacity	26.7 gal

Transmission and speeds
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Transmission Type	TF	planetary gear	PS	TORQFLOW
Number Of Forward Gears	3	3	3	3
Number Of Reverse Gears	3	3	3	3

Specification	D85A-21	D85E-18	D155A-2
Max Speed - Forward	3.8 mph	7 mph	7.4 mph
Max Speed - Reverse	4.9 mph	8.3 mph	8.6 mph

Hydraulic System
Specification	D85A-21	D155A-2
Pump Type	Gear -type pump	gear type
Relief Valve Pressure	2,774 psi	2,000 psi
Pump Flow Capacity	51.3 gpm	94 gpm

Standard Blade
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Blade width	12.3 ft	12.3 ft	13.6 ft	13.6 ft
Blade height	54.8 in	51.8 in	58.7 in	70.5 in

Specification	D85A-21	D85E-18	D155A-2
Capacity	6.9 yd3	8.5 yd3	12.3 yd3

Specification	D85A-21	D85E-18
Cutting Depth	21.3 in	19.3 in

Variants — Source comparison annotation
Source guide	Differing-field count reported
D85A-21 to D155A-2	38

Ratios
Figure	D85A-21	D85E-18	D135A-2	D155A-2
Engine horsepower per 1,000 lb of weight	4.2	5.2	4.4	4.2

Figure	D85A-21	D155A-2
Pump flow per engine horsepower	0.22 gpm	0.29 gpm

Figure	D85A-21	D85E-18	D155A-2
Fuel tank per engine horsepower	0.56 gal	0.54 gal	0.50 gal

D85A-21 to D155A-2: owner reports

Sources: 3 forum discussions about the Komatsu D85 dozers; heavyequipmentforums.com.

Komatsu: Steering and gear engagement.

Sources: 3 forum discussions about the Komatsu D155 dozers (D155A-1, D155AX-6); heavyequipmentforums.com.

Komatsu: Will not move, and torque converter heat.

D85A-21 to D155A-2: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	crawler dozer	Komatsu and the D85A, D155A line that the D85A-21, D85E-18, D135A-2, D155A-2 belongs to (no title names the exact model)	11

Topics named by those titles
Title topic	Titles
transmission and drive	2

Topic in the title	Threads	Share of matching threads
transmission and drive	2	18%

Komatsu D155a 1 Dozer Wont Move (Heavy Equipment Forums, 2024-10-01)
D85e 18 Komatsu (Heavy Equipment Forums, 2024-08-13)
Komatsu D155a (Heavy Equipment Forums, 2024-04-07)
Komatsu D85a 12 Final Drive Interchange (Heavy Equipment Forums, 2022-03-02)

Used market for the D85A-21 to D155A-2 — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Komatsu crawler dozer	9

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
D85A-21	4	1992 to 2020	$24,000	$99,632	$56,296	None shown
D85E-18	3	1980 to 1989	$89,500	$89,500	$89,500	6,700
D155A-2	2	1992 to 2005	$80,000	$80,000	$80,000	None shown

D85A-21 to D155A-2: 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 crawler dozer D85A-21, D85E-18, D135A-2, D155A-2	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu D85A-21 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu D85E-18 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu D135A-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu D155A-2 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Komatsu D85A-21 to D155A-2 — Heavy Equipment Forums. Observed 2026-09-24.
Forum threads	Forum threads: Forum threads read for the Komatsu D85 dozers — Heavyequipmentforums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Komatsu D85A-21 — 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 D85A-21 to D155A-2: Configuration records

D85A-21

Specification	Source figure
Dimensions and weight
Length W/ Blade	22.41 ft
Width Over Tracks	8.6 ft
Height To Top Of Cab	11.09 ft
Ground Clearance	1.37 ft
Length W/O Blade	15.52 ft
Undercarriage
Standard Shoe Size	22.05 in
Number Of Shoes Per Side	39
Ground Pressure	8.4 psi
Number Of Carrier Rollers Per Side	2
Ground Contact Area	4,931 in2
Number Of Track Rollers Per Side	7
Track Pitch	8.51 in
Engine
Number Of Cylinders	6
Engine Model	S6D125E
Gross Power	228 hp
Power Measured @	2,000 rpm
Max Torque	737.3 lb-ft
Displacement	930.1 cu in
Torque Measured @	1,400 rpm
Aspiration	Turbocharged
Operational
Fuel Capacity	126.9 gal
Cooling System Fluid Capacity	20.9 gal
Engine Oil Capacity	7.2 gal
Hydraulic Fluid Capacity	26.7 gal
Powertrain Fluid Capacity	23.8 gal
Final Drives Fluid Capacity	10.9 gal
Operating Voltage	24 V
Transmission and speeds
Transmission Type	TF
Number Of Forward Gears	3
Number Of Reverse Gears	3
Max Speed - Forward	3.8 mph
Max Speed - Reverse	4.9 mph
Hydraulic System
Pump Type	Gear -type pump
Relief Valve Pressure	2,774 psi
Pump Flow Capacity	51.3 gpm
Standard Blade
Blade width	12.3 ft
Capacity	6.9 yd3
Cutting Depth	21.3 in
Additional specifications
Length Of Track On Ground	9.32 ft
Track Gauge	6.57 ft
Operating Weight	53,881 lb
Blade height	54.8 in

Source

D85E-18

Specification	Source figure
Dimensions and weight
Width Over Tracks	8.6 ft
Height To Top Of Cab	11.14 ft
Ground Clearance	1.33 ft
Length W/O Blade	14.39 ft
Undercarriage
Standard Shoe Size	22.05 in
Ground Pressure	7.9 psi
Number Of Track Rollers Per Side	7
Engine
Engine Model	NT-855
Gross Power	220 hp
Max Torque	759 lb-ft
Displacement	855 cu in
Aspiration	turbocharged
Operational
Fuel Capacity	118.9 gal
Cooling System Fluid Capacity	20.9 gal
Transmission and speeds
Transmission Type	planetary gear
Number Of Forward Gears	3
Number Of Reverse Gears	3
Max Speed - Forward	7 mph
Max Speed - Reverse	8.3 mph
Standard Blade
Blade width	12.3 ft
Capacity	8.5 yd3
Cutting Depth	19.3 in
Additional specifications
Length Of Track On Ground	8.96 ft
Track Gauge	6.57 ft
Operating Weight	42,560 lb
Blade height	51.8 in

Source

D135A-2

Specification	Source figure
Dimensions and weight
Length W/ Blade	26.17 ft
Width Over Tracks	9.11 ft
Height To Top Of Cab	11.49 ft
Ground Clearance	1.51 ft
Length W/O Blade	16.25 ft
Undercarriage
Standard Shoe Size	22.05 in
Number Of Shoes Per Side	40
Number Of Carrier Rollers Per Side	2
Number Of Track Rollers Per Side	7
Track Pitch	9 in
Engine
Number Of Cylinders	6
Engine Model	S6D140
Gross Power	289 hp
Power Measured @	2,000 rpm
Displacement	930.1 cu in
Transmission and speeds
Transmission Type	PS
Number Of Forward Gears	3
Number Of Reverse Gears	3
Standard Blade
Blade width	13.6 ft
Additional specifications
Length Of Track On Ground	10.14 ft
Track Gauge	6.89 ft
Operating Weight	65,698 lb
Blade height	58.7 in

Source

D155A-2

Specification	Source figure
Dimensions and weight
Length W/ Blade	21.53 ft
Width Over Tracks	7.03 ft
Height To Top Of Cab	12.31 ft
Ground Clearance	1.65 ft
Length W/O Blade	17.72 ft
Undercarriage
Standard Shoe Size	22.05 in
Number Of Shoes Per Side	41
Number Of Carrier Rollers Per Side	2
Number Of Track Rollers Per Side	7
Track Pitch	9 in
Engine
Number Of Cylinders	6
Engine Model	S6D155-4
Gross Power	320 hp
Power Measured @	2,000 rpm
Max Torque	1,040 lb-ft
Displacement	1,175 cu in
Torque Measured @	1,400 rpm
Aspiration	turbocharged
Operational
Fuel Capacity	158.6 gal
Cooling System Fluid Capacity	43.6 gal
Engine Oil Capacity	15.1 gal
Powertrain Fluid Capacity	36 gal
Final Drives Fluid Capacity	14.6 gal
Operating Voltage	24 V
Transmission and speeds
Transmission Type	TORQFLOW
Number Of Forward Gears	3
Number Of Reverse Gears	3
Max Speed - Forward	7.4 mph
Max Speed - Reverse	8.6 mph
Hydraulic System
Pump Type	gear type
Relief Valve Pressure	2,000 psi
Pump Flow Capacity	94 gpm
Standard Blade
Blade width	13.6 ft
Capacity	12.3 yd3
Additional specifications
Length Of Track On Ground	10.34 ft
Track Gauge	7.03 ft
Operating Weight	76,192 lb
Blade height	70.5 in

Source

Compare Komatsu D85A-21, D85E-18, D135A-2, D155A-2

Dimensions and weight
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Width Over Tracks	8.6 ft	8.6 ft	9.11 ft	7.03 ft
Height To Top Of Cab	11.09 ft	11.14 ft	11.49 ft	12.31 ft
Length Of Track On Ground	9.32 ft	8.96 ft	10.14 ft	10.34 ft
Ground Clearance	1.37 ft	1.33 ft	1.51 ft	1.65 ft
Length W/O Blade	15.52 ft	14.39 ft	16.25 ft	17.72 ft

Undercarriage
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Track Gauge	6.57 ft	6.57 ft	6.89 ft	7.03 ft
Standard Shoe Size	22.05 in	22.05 in	22.05 in	22.05 in
Number Of Track Rollers Per Side	7	7	7	7

Engine
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Engine Model	S6D125E	NT-855	S6D140	S6D155-4
Gross Power	228 hp	220 hp	289 hp	320 hp
Displacement	930.1 cu in	855 cu in	930.1 cu in	1,175 cu in

Operational
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Operating Weight	53,881 lb	42,560 lb	65,698 lb	76,192 lb

Transmission and speeds
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Transmission Type	TF	planetary gear	PS	TORQFLOW
Number Of Forward Gears	3	3	3	3
Number Of Reverse Gears	3	3	3	3

Standard Blade
Specification	D85A-21	D85E-18	D135A-2	D155A-2
Blade width	12.3 ft	12.3 ft	13.6 ft	13.6 ft
Blade height	54.8 in	51.8 in	58.7 in	70.5 in

More in Komatsu: D85EX/PX-15: engine editions/tracks/blade control, D275A-2–D375A-2, D95S-1/D95S-2.

Komatsu D85A-21 to D155A-2 specifications

D85A-21 to D155A-2: owner reports

Sources for this page

Komatsu D85A-21 to D155A-2: Configuration records