Kubota BX1870 Workshop Manual

HYDRAULIC SYSTEM
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
5-M9
6. HYDRAULIC CYLINDER
The main components of the hydraulic cylinder are shown in the figure above.
While the lift arm (1) is rising, oil from the hydraulic pump flows into the hydraulic cylinder through the hydraulic
control valve (12) and cylinder port C. Then oil pushes out the piston (5).
While the lift arm (1) is lowering, oil in the hydraulic cylinder is discharged to the transmission case through the
hydraulic control valve by the weight of the implement. At this time, the lowering speed of the implement can be
controlled by the ball (7) attached to the hydraulic cylinder (11). Turning the lowering speed adjusting knob clockwise
decreases the lowering speed, and counterclockwise increases lowering speed. When the lowering speed adjusting
valve is completely closed, the lift arm (1) is held at its position since oil in the hydraulic cylinder is sealed between
the piston (5) and ball (7).
9Y1210855HYM0010US0
(1) Lift Arm
(2) Hydraulic Arm
(3) Hydraulic Arm Shaft
(4) Hydraulic Rod
(5) Piston
(6) Spring
(7) Ball
(8) Lowering Speed Adjusting
Shaft
(9) Back-up Ring
(10) O-ring
(11) Hydraulic Cylinder
(12) Control Valve
P: Pump Port
C: Cylinder Port
KiSC issued 02, 2017 A

Kubota BX1870 Specifications

General

Engine Type	Diesel
Engine Power	18 hp
Transmission	Hydrostatic
Fuel Capacity	6.6 gallons
Wheelbase	55.1 inches
Type	Sub-Compact Utility Tractor
Engine	Kubota D722
PTO Power	13.5 hp
Number of Cylinders	3
Cooling	Liquid
Drive	4WD
Drive Type	4WD
Width	44.5 inches
Hydraulic System Type	Open center
PTO Speed	540 RPM
Displacement	0.719 L
Fuel Tank Capacity	6.6 gallons
Gears	Infinite (2-range) forward and reverse
Front Tire Size	18x8.5-10
Rear Tire Size	26x12-12