CHAPTER III MACHINE OPERATION
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2.5 HYDRAULIC SYSTEM
2.5.1 IMPLEMENT HYDRAULIC SYSTEM
2.5.1.1 Implement hydraulic system is used to control the action of the bucket, including oil tanks,
implement pump, the multiple way valve, the boom cylinder, the tilt cylinders, the leveling valve, oil tubes
and other components.
2.5.1.2 When the working device does not work, the hydraulic oil from the implement pump flows
to the implement distribution valve, then the hydraulic oil flows through chamber and flows back to the oil
chamber and oil tank.
2.5.1.3 When you shovel materials, dump materials, moving the right handle, the oil from the
implement pump flows through the distribution valve into the rear or front chamber of the bucket cylinder.
This causes the bucket to tilt up or down. When you raise or lower the lift arm, moving the left handle, the
oil from the implement pump flows through the distribution valve into the lower or upper chamber of lift
boom cylinder. This causes the lift and the bucket to raise or lower.
2.5.1.4 When the external load exceeds the raising or tilting up capacity of the system, or the piston
of boom cylinder reaches the end of the cylinder (the piston of the bucket cylinder reaches the front end
of the cylinder). When the system pressure goes up to the set point, the pressure oil opens the escape
valve to overflow and unload. The pressure oil flows through the distribution valve back to the oil tank.
2.5.1.5 When the oil pressure of the bucket cylinder front chamber is higher than the set pressure of
the double-acting escape valve in the front chamber multiple reversal valve, the pressure oil opens the
escape valve to overflow and unload. The pressure oil flows through the distribution valve back to the oil
tank. The implement oil from the pump flows through the distribution valve into the upper and lower
chamber of the boom cylinder and connects the fuel tank at the moment, the oil pressure in the upper
and lower chamber of the cylinder is low. The bucket can float freely caused by its own weight and can
work close to the ground.
2.5.1.6 The implement pump is gear type. The implement and traveling pumps are coaxial with the
engine, but the traveling pump is piston type.
2.5.2 TRAVEL HYDRAULIC SYSTEM
Travel hydraulic system is used for controlling the travel of the machine, including the oil tank, the
variable piston pump, the travel motor, unblocking solenoid valve, oil tubes and other components.
2.5.2.1 The variable piston pump
The variable piston pump is connected to the engine by the coupling. It provides driving force for
the travel system.
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