RK Tractors

RK Tractors RK55S

The RK Tractors RK55S is a compact utility tractor built by TYM and distributed by RK Tractors (a part of Rural King) since 2017. It features a Yanmar 2.1L 4-cylinder turbocharged diesel engine producing 55.1 hp gross, with a 16-speed mechanical shuttle transmission. The tractor includes four-wheel drive, power steering, wet disc brakes, and a two-post ROPS. It supports various attachments including a front-end loader and backhoe, making it versatile for multiple tasks. The RK55S offers a fuel tank capacity of 17 gallons and has a wheelbase of 76.2 inches. It is available in several variants including shuttle and hydrostatic transmissions with ROPS or cab options.

Power55 hp

Founded2017 -

ModelRK55S

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Technical Specifications

Detailed specifications and technical data for RK Tractors RK55S

Power

PTO (claimed)	44.9 hp (33.5 kW)
Engine (gross)	55.1 hp (41.1 kW)

Tires

Lawn/turf rear	16.9x24
Industrial rear	16.9x24
Lawn/turf front	12x16.5
Industrial front	12x16.5
Standard tires (ag)	Front: 9.5x16. Rear: 14.9x24

Engine

Type	turbocharged diesel
Model	Yanmar 4TNV86T-CR
Cooling	liquid-cooled
Starter	electric
Cylinders	4-cylinder
Fuel tank	17 gal (64.3 L)
Rated RPM	2800
Bore/Stroke	3.39x3.54 inches (86 x 90 mm)
Fuel system	common rail direct injection
Displacement	127.6 ci (2.1 L)
Power (gross)	55.1 hp (41.1 kW)
Starter volts	12

Variants

RK55H	hydrostatic ROPS
RK55S	shuttle ROPS
RK55HC	hydrostatic cab
RK55SC	shuttle cab

Dimensions

Width	63.8 inches (162 cm)
Length	141.3 inches (358 cm)
Weight	3814 lbs (1730 kg)
Wheelbase	76.2 inches (193 cm)
Height (ROPS)	102.1 inches (259 cm)
Ground clearance	13.8 inches (35 cm)

Electrical

Ground	negative
Battery volts	12
Charging amps	70
Charging system	alternator

Hydraulics

Valves	2
Pump flow	9.5 gpm (36.0 lpm)
Total flow	14.5 gpm (54.9 lpm)
Steering flow	5 gpm (18.9 lpm)

Mechanical

ROPS	Two-post ROPS
Drive	Four-wheel drive
Brakes	Wet disc brakes
Steering	Power steering

Production

Type	Compact Utility tractor
Distributor	RK Tractors (a part of Rural King)
Manufacturer	TYM
Original price	$21,799 in 2017
Production years	2017 -

Attachments

Backhoe	RK Tractors BH8.0 Backhoe
Loader weight	1261 lbs (571 kg)
Backhoe weight	1500 lbs (680 kg) Without bucket
Loader rollback	35°
Front-end loader	L110 Loader
Backhoe swing arc	180°
Loader attachment	quick coupler
Loader dump angle	45°
Loader bucket width	72 inches (182 cm)
Backhoe bucket force	4435 lbs (2011 kg)
Backhoe bucket widths	9 inches (22 cm), 12 inches (30 cm), 16 inches (40 cm), 18 inches (45 cm), 24 inches (60 cm)
Loader reach (dumped)	21.4 inches (54 cm)
Loader reach (ground)	73.1 inches (185 cm)
Backhoe loading height	92.4 inches (234 cm)
Loader height (at pin)	109.1 inches (277 cm)
Backhoe bucket rotation	151°
Backhoe reach from pivot	134.4 inches (341 cm)
Backhoe transport height	91.2 inches (231 cm)
Loader breakout (at pin)	4938 lbs (2239 kg)
Backhoe dipperstick force	2694 lbs (1221 kg)
Loader clearance (dumped)	80.8 inches (205 cm)
Loader lift (full at pin)	2478 lbs (1124 kg)
Backhoe 2-Foot flat digging depth	103.2 inches (262 cm)

Transmission

Type	mechanical shuttle
Gears	16 forward and reverse
Speeds	Reverse speeds are 15% slower than forward
Details	Four synchronized gears (1-4) in four ranges with mechanical shuttle

Tractor hitch