Machine models

Komatsu 840.3 and 890.3 specifications

Entries in this reference
Listing-entry count
2

Short answer

Komatsu 840.3 and 890.3: forwarders.

Selected configuration figures
Configuration	Documented field and quantity
840.3	Power 168 hp Operating Weight - 6wd 30,644 lb
890.3	Power 204 hp Operating Weight - 6wd 37,038 lb

840.3 and 890.3 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Komatsu	840.3 and 890.3	2	840.3 and 890.3

Operational
Specification	840.3	890.3
Operating Weight - 6wd	30,644 lb	37,038 lb
Operating Weight - 8wd	33,951 lb	42,108 lb
Fuel Capacity	42.3 gal	55.5 gal
Hydraulic System Fluid Capacity	26.5 gal	34.4 gal
Operating Voltage	24 V	24 V
Alternator Supplied Amperage	140 amps	140 amps
Front/Rear Tire Size - 6wd	600/65x34, 600/55x26.5	700/70x34 650/65x26.5
Front/Rear Tire Size - 8wd	600/55x26.5	650/65x26.5 750/55x26.5

Transmission and speeds
Specification	840.3	890.3
Transmission Type	Hydrostatic	hydrostatic
Max Speed	14.7 mph	15.6 mph

Hydraulic
Specification	840.3	890.3
Pump Type	sing circuit load sensing with variable piston pump	single circuit load sensing with variable piston pump
Flow Capacity	76.7 gpm	89.9 gpm
Relief Valve Pressure	3,400 psi	3,400 psi

Crane
Specification	840.3
Crane Type	CRF 8.1

Variants — Source comparison annotation
Source guide	Differing-field count reported
840.3 and 890.3	23

Ratios
Figure	840.3	890.3
Engine horsepower per 1,000 lb of weight	5.5	5.5
Fuel tank per engine horsepower	0.25 gal	0.27 gal

Komatsu 840.3 and 890.3: forwarder

Production years. LECTURA Specs dates the Valmet-built 890.3 forwarder to 2006 to 2010 and the Komatsu 830.3 forwarder to 2007 to 2013. Valmet 890.3 (2006-2010), LECTURA Specs; Komatsu 830.3 (2007-2013), LECTURA Specs.
Komatsu Forest. Komatsu Forest AB is fully owned by Komatsu Ltd; the business traces to Umeå Mekaniska in Umeå, Sweden, founded 1961, and became Komatsu Forest AB in 2004. Komatsu, LECTURA Specs manufacturer page.
Related forwarders. The later 840.4 forwarder is listed for 2008 to 2013, and 890 forwarders show up in listings from 2002, so the .3 generation sits around the turn of the 2000s. Komatsu 840.4 (2008-2013), LECTURA Specs; Komatsu 890 forwarders, Machinio.

840.3 and 890.3: dated market and recall observations — Dated listing search
Date	Listing index	Equipment class	Names queried	Result
2026-09-24	MachineryTrader (machinerytrader.com)	forwarder	840.3, 890.3	No matching offers in this snapshot

Dated CPSC search
Date	Database	Names queried	Result
2026-09-24	U.S. Consumer Product Safety Commission	Komatsu; 840.3, 890.3	No matching recall in the stated search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu 840.3 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu 890.3 — RitchieSpecs. Observed 2026-09-24.
Published history	Published history Source: Valmet 890.3 (2006-2010), LECTURA Specs — LECTURA Specs. Observed 2026-09-25.
Published history	Published history Source: Komatsu 830.3 (2007-2013), LECTURA Specs — LECTURA Specs. Observed 2026-09-25.
Published history	Published history Source: Komatsu, LECTURA Specs manufacturer page — LECTURA Specs. Observed 2026-09-25.
Published history	Published history Source: Komatsu 840.4 (2008-2013), LECTURA Specs — LECTURA Specs. Observed 2026-09-25.
Published history	Published history Source: Komatsu 890 forwarders, Machinio — Machinio. Observed 2026-09-25.
Federal agency data	Federal agency data: Recall database search for Komatsu — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

840.3

Specification	Source figure
Dimensions and weight
Length	30.5 ft
Wheelbase	16.3 ft
Width Over Tires	8.67 ft
Height To Top Of Crane	12.5 ft
Ground Clearance	2.25 ft
Length Of Bunk Area	4.93 ft
Engine
Number Of Cylinders	6
Engine Model	66CTA Tier 3
Power	168 hp
Torque	520 lb-ft
Power Measured @	2,000 rpm
Displacement	402.8 cu in
Torque Measured @	1,500 rpm
Aspiration	Turbo
Operational
Operating Weight - 6wd	30,644 lb
Operating Weight - 8wd	33,951 lb
Fuel Capacity	42.3 gal
Hydraulic System Fluid Capacity	26.5 gal
Operating Voltage	24 V
Alternator Supplied Amperage	140 amps
Front/Rear Tire Size - 6wd	600/65x34, 600/55x26.5
Front/Rear Tire Size - 8wd	600/55x26.5
Transmission and speeds
Transmission Type	Hydrostatic
Max Speed	14.7 mph
Hydraulic
Pump Type	sing circuit load sensing with variable piston pump
Flow Capacity	76.7 gpm
Relief Valve Pressure	3,400 psi
Bunk
Load Weight - 6wd	26,456 lb
Load Weight - 8wd	26,456 lb
Load Area	44.2 ft2
Crane
Crane Type	CRF 8.1
Max Reach	25.6 ft
Gross Lift Torque	78,300 lb-ft
Gross Slew Torque	6,460 lb-ft

890.3

Specification	Source figure
Dimensions and weight
Length	30.5 ft
Wheelbase	10.41 ft
Width Over Tires	10.41 ft
Height To Top Of Crane	12.5 ft
Ground Clearance	2.25 ft
Length Of Bunk Area	4.93 ft
Engine
Number Of Cylinders	6
Engine Model	74 CTA Tier 3
Power	204 hp
Torque	742 lb-ft
Power Measured @	2,000 rpm
Displacement	451.6 cu in
Torque Measured @	1,500 rpm
Aspiration	Turbo
Operational
Operating Weight - 6wd	37,038 lb
Operating Weight - 8wd	42,108 lb
Fuel Capacity	55.5 gal
Hydraulic System Fluid Capacity	34.4 gal
Operating Voltage	24 V
Alternator Supplied Amperage	140 amps
Front/Rear Tire Size - 6wd	700/70x34 650/65x26.5
Front/Rear Tire Size - 8wd	650/65x26.5 750/55x26.5
Transmission and speeds
Transmission Type	hydrostatic
Max Speed	15.6 mph
Hydraulic
Pump Type	single circuit load sensing with variable piston pump
Flow Capacity	89.9 gpm
Relief Valve Pressure	3,400 psi
Bunk
Load Weight - 6wd	39,683 lb
Load Weight - 8wd	39,683 lb
Load Area	60.3 ft2
Crane
Max Reach	24.7 ft
Gross Lift Torque	114,300 lb-ft
Gross Slew Torque	30,460 lb-ft