Machine models

Grove GMK3050, GMK4085B, and GMK6220 specifications

Entries in this reference
Listing-entry count
3

Short answer

Grove GMK3050, GMK4085B, and GMK6220: all terrain cranes.

Selected configuration figures
Configuration	Documented field and quantity
GMK3050	Gross Power 348.7 hp Operating Weight 74,180 lb
GMK4085B	Gross Power 335.3 hp Operating Weight 89,630 lb
GMK6220	Gross Power 165 hp Operating Weight 138,891 lb

GMK3050, GMK4085B, and GMK6220 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Grove	GMK3050, GMK4085B, and GMK6220	3	GMK3050, GMK4085B, and GMK6220

Boom
Specification	GMK3050	GMK4085B	GMK6220
Min Height @ Max Raise Angle	32 ft	38 ft	44.3 ft
Max Height @ Max Raise Angle - No Jib	125 ft	125 ft	196.86 ft
Min Working Radius	10 ft	10 ft	44.3 ft
Max Working Radius	110 ft	110 ft	196.86 ft
Max Elevating Angle	82 degrees	84 degrees	82 degrees
Number Of Sections	5	4	6
Max Lift Capacity	110,000 lb	162,000 lb	138,800 lb
Swing Speed	2.5 rpm	2.4 rpm	1.7 rpm

Dimensions and weight
Specification	GMK3050	GMK4085B	GMK6220
Transport Length	36.16 ft	43.25 ft	53.11 ft
Transport Width	9.39 ft	9.39 ft	10.08 ft
Transport Height	11.42 ft	12.16 ft	13.1 ft
Width W/ Outriggers Extended	20.35 ft	23.63 ft	19.69 ft
Carrier Length	28.75 ft	33.14 ft	49.7 ft

Specification	GMK3050	GMK4085B
Upper Structure Tail Swing Radius	10.5 ft	11.49 ft

Specification	GMK6220
Gradeability	46 %

Carrier Engine
Specification	GMK3050	GMK4085B	GMK6220
Make	Grove	Grove	Grove
Model	OM501LA	OM 442A	6BTA5.9-C
Gross Power	348.7 hp	335.3 hp	165 hp
Power Measured @	1,800 rpm	2,100 rpm	2,000 rpm
Max Torque	1,276 lb-ft	1,106 lb-ft	538.5 lb-ft
Torque Measured @	1,080 rpm	1,200 rpm	1,500 rpm

Specification	GMK6220
Number Of Cylinders	6

Operational
Specification	GMK3050	GMK4085B	GMK6220
Operating Weight	74,180 lb	89,630 lb	138,891 lb
Number Of Axels	3	4	6
Carrier Fuel Capacity	95.2 gal	132.1 gal	132.1 gal
Upper Structure Hydraulic System Fluid Capacity	158.6 gal	237.8 gal	258.9 gal
Operating Voltage	24 V	24 V	24 V
Alternator Supplied Amperage	100 amps	55 amps	28 amps
Tire Size	20.5R25	20.5R25	20.5R25

Transmission and speeds
Specification	GMK3050	GMK4085B	GMK6220
Transmission Type	Allison automatic MD 3066 P	automatic powershift	Allison automatic CLT 755
Number Of Forward Gears	6	5	5
Number Of Reverse Gears	1	1	1
Max Speed - Forward	52.9 mph	46 mph	47.9 mph

Grove GMK3050, GMK4085B, and GMK6220: Upper Structure Engine

Variants — Source comparison annotation
Source guide	Differing-field count reported
GMK3050, GMK4085B, and GMK6220	35

Ratios
Figure	GMK3050	GMK4085B	GMK6220
Engine horsepower per 1,000 lb of weight	4.7	3.7	1.2

Grove GMK3050, GMK4085B, and GMK6220: all terrain crane

GMK3050, GMK4085B, and GMK6220: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	all terrain crane	Grove and the GMK3050. That is too few titles to say what owners mostly ask about, so the most recent are listed instead	2

Grove Gmk3050 (Heavy Equipment Forums, 2024-02-25)
Gmk3050 (Heavy Equipment Forums, 2016-03-29)

Used market for the GMK3050, GMK4085B, and GMK6220 — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Grove all terrain crane	13

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
GMK3050	11	1999 to 2007	$50,000	$158,924	$98,269	None shown
GMK6220	2	2004 to 2008	None shown	None shown	None shown	2,004

GMK3050, GMK4085B, and GMK6220: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Grove together with the all terrain crane GMK3050, GMK4085B, GMK6220	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Grove GMK3050 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Grove GMK4085B — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Grove GMK6220 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Grove GMK3050, GMK4085B, and GMK6220 — Heavy Equipment Forums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Grove GMK3050 — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Grove — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Recorded observations — Classification in the linked listing
Guide	As-listed machine class
Grove GMK3050, GMK4085B, and GMK6220	all terrain crane

Grove GMK3050, GMK4085B, and GMK6220: Configuration records

GMK3050

Specification	Source figure
Boom
Min Height @ Max Raise Angle	32 ft
Max Height @ Max Raise Angle - No Jib	125 ft
Min Working Radius	10 ft
Max Working Radius	110 ft
Max Elevating Angle	82 degrees
Max Lift Capacity	110,000 lb
Swing Speed	2.5 rpm
Number Of Sections	5
Dimensions and weight
Transport Length	36.16 ft
Transport Width	9.39 ft
Transport Height	11.42 ft
Width W/ Outriggers Extended	20.35 ft
Carrier Length	28.75 ft
Upper Structure Tail Swing Radius	10.5 ft
Operational
Operating Weight	74,180 lb
Number Of Axels	3
Carrier Fuel Capacity	95.2 gal
Upper Structure Hydraulic System Fluid Capacity	158.6 gal
Operating Voltage	24 V
Tire Size	20.5R25
Alternator Supplied Amperage	100 amps
Transmission and speeds
Transmission Type	Allison automatic MD 3066 P
Number Of Forward Gears	6
Number Of Reverse Gears	1
Max Speed - Forward	52.9 mph
Additional specifications
Make	Grove
Model	OM501LA
Gross Power	348.7 hp
Power Measured @	1,800 rpm
Max Torque	1,276 lb-ft
Torque Measured @	1,080 rpm

Source

GMK4085B

Specification	Source figure
Boom
Min Height @ Max Raise Angle	38 ft
Max Height @ Max Raise Angle - No Jib	125 ft
Min Working Radius	10 ft
Max Working Radius	110 ft
Max Elevating Angle	84 degrees
Max Lift Capacity	162,000 lb
Swing Speed	2.4 rpm
Number Of Sections	4
Dimensions and weight
Transport Length	43.25 ft
Transport Width	9.39 ft
Transport Height	12.16 ft
Width W/ Outriggers Extended	23.63 ft
Carrier Length	33.14 ft
Upper Structure Tail Swing Radius	11.49 ft
Operational
Operating Weight	89,630 lb
Number Of Axels	4
Carrier Fuel Capacity	132.1 gal
Upper Structure Hydraulic System Fluid Capacity	237.8 gal
Operating Voltage	24 V
Tire Size	20.5R25
Alternator Supplied Amperage	55 amps
Transmission and speeds
Transmission Type	automatic powershift
Number Of Forward Gears	5
Number Of Reverse Gears	1
Max Speed - Forward	46 mph
Additional specifications
Make	Grove
Model	OM 442A
Gross Power	335.3 hp
Power Measured @	2,100 rpm
Max Torque	1,106 lb-ft
Torque Measured @	1,200 rpm

Source

GMK6220

Specification	Source figure
Boom
Min Height @ Max Raise Angle	44.3 ft
Max Height @ Max Raise Angle - No Jib	196.86 ft
Min Working Radius	44.3 ft
Max Working Radius	196.86 ft
Max Elevating Angle	82 degrees
Swing Speed	1.7 rpm
Number Of Sections	6
Dimensions and weight
Transport Length	53.11 ft
Transport Width	10.08 ft
Transport Height	13.1 ft
Width W/ Outriggers Extended	19.69 ft
Carrier Length	49.7 ft
Gradeability	46 %
Carrier Engine
Number Of Cylinders	6
Operational
Operating Weight	138,891 lb
Number Of Axels	6
Carrier Fuel Capacity	132.1 gal
Upper Structure Hydraulic System Fluid Capacity	258.9 gal
Operating Voltage	24 V
Tire Size	20.5R25
Alternator Supplied Amperage	28 amps
Transmission and speeds
Transmission Type	Allison automatic CLT 755
Number Of Forward Gears	5
Number Of Reverse Gears	1
Max Speed - Forward	47.9 mph
Additional specifications
Make	Grove
Model	6BTA5.9-C
Gross Power	165 hp
Power Measured @	2,000 rpm
Max Torque	538.5 lb-ft
Torque Measured @	1,500 rpm

Source

Compare Grove GMK3050, GMK4085B, GMK6220

Boom
Specification	GMK3050	GMK4085B	GMK6220
Min Height @ Max Raise Angle	32 ft	38 ft	44.3 ft
Max Height @ Max Raise Angle - No Jib	125 ft	125 ft	196.86 ft
Min Working Radius	10 ft	10 ft	44.3 ft
Max Working Radius	110 ft	110 ft	196.86 ft
Max Elevating Angle	82 degrees	84 degrees	82 degrees
Number Of Sections	5	4	6
Swing Speed	2.5 rpm	2.4 rpm	1.7 rpm

Dimensions and weight
Specification	GMK3050	GMK4085B	GMK6220
Transport Length	36.16 ft	43.25 ft	53.11 ft
Transport Width	9.39 ft	9.39 ft	10.08 ft
Transport Height	11.42 ft	12.16 ft	13.1 ft
Width W/ Outriggers Extended	20.35 ft	23.63 ft	19.69 ft
Carrier Length	28.75 ft	33.14 ft	49.7 ft

Carrier Engine
Specification	GMK3050	GMK4085B	GMK6220
Make	Grove	Grove	Grove
Model	OM501LA	OM 442A	6BTA5.9-C
Gross Power	348.7 hp	335.3 hp	165 hp
Power Measured @	1,800 rpm	2,100 rpm	2,000 rpm
Max Torque	1,276 lb-ft	1,106 lb-ft	538.5 lb-ft
Torque Measured @	1,080 rpm	1,200 rpm	1,500 rpm

Operational
Specification	GMK3050	GMK4085B	GMK6220
Operating Weight	74,180 lb	89,630 lb	138,891 lb
Number Of Axels	3	4	6
Carrier Fuel Capacity	95.2 gal	132.1 gal	132.1 gal
Upper Structure Hydraulic System Fluid Capacity	158.6 gal	237.8 gal	258.9 gal
Operating Voltage	24 V	24 V	24 V
Alternator Supplied Amperage	100 amps	55 amps	28 amps
Tire Size	20.5R25	20.5R25	20.5R25

Transmission and speeds
Specification	GMK3050	GMK4085B	GMK6220
Transmission Type	Allison automatic MD 3066 P	automatic powershift	Allison automatic CLT 755
Number Of Forward Gears	6	5	5
Number Of Reverse Gears	1	1	1
Max Speed - Forward	52.9 mph	46 mph	47.9 mph

More in Grove: GMK3050-1–GMK4100B, AT700B/AT865/GMK3055, AT9120–GMK5180.

Grove GMK3050, GMK4085B, and GMK6220 specifications

Grove GMK3050, GMK4085B, and GMK6220: Upper Structure Engine

Grove GMK3050, GMK4085B, and GMK6220: all terrain crane

Sources for this page

Grove GMK3050, GMK4085B, and GMK6220: Configuration records