The 330D uses a negative flow control (NFC) hydraulic system. The main control valve is similar to the 330C main control valve. The main hydraulic pumps are different from the 330C.
The engine fan is now hydraulically driven. The engine fan is mounted on a fixed displacement motor. The variable displacement fan pump, located in the pump compartment, sends hydraulic oil to turn the fan motor. The 330D continues using many of the "C" excavator features, such as automatic priorities and tool control systems.
Stick Cylinder
Bucket Cylinder Boom Cylinders
Swing Motor Travel Motors
Pilot
Main Control Valve Group
MAIN HYDRAULIC SYSTEM
Fan Pump Tank
The pilot pump (arrow) is driven off the left hydraulic pump. The pilot pump draws oil from the main pump suction line. The oil is sent to the pilot filter and then to the pilot system.
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Pilot system components shown in this photo are:
- pilot oil filter (1)
- hydraulic oil S•O•S test port (2) - pilot oil pressure test port (3)
- pilot system pressure relief valve (4) 23 1
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3
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The 330D pilot manifold is the same as the "C" pilot manifold. The pilot manifold is accessible by removing the cover plate under the machine, behind the swing bearing. The manifold is located directly below the main control valve. Pilot manifold components visible are:
- Two-speed travel solenoid (1) - Swing brake solenoid (2) - Hydraulic activation valve (3) - Hydraulic activation solenoid (4)
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2
3
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The 330D uses automatic priorities for certain functions based on the position of the joysticks.
The boom priority (1) and the swing priority (2) pressure reducing valves are located behind the swing bearing on the left side of the machine.
The boom priority PRV provides boom up priority over the stick in function. The swing priority PRV provides swing priority over the stick in or stick out function.
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The 330D has a pilot operated, two stage main relief valve (arrow) located on the top center of the main control valve. The relief valve settings are 35000 ± 490 kPa (5076 ± 71 psi) for implement/travel and 36000 ± 490 kPa (5220 ± 71 psi) for heavy lift mode. The high pressure setting for heavy lift must be correctly adjusted before adjustments can be made for
implement/travel settings. Refer to the Testing and Adjusting manual RENR9585 (Aurora and Akashi build) or RENR9678 (Gossilies build) for the proper procedure on setting the main relief valve.
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Two travel pressure switches for left and right travel (not shown) and the swing/implement pressure switch (arrow), are located under the cab. The pressure switches are activated by pilot oil from the control valves in the cab. The switches close at 490 ± 49 kPa (71 ± 7 psi) and open at 290 ± 0 kPa (42 ± 0 psi).
The pressure switches are inputs to the Machine and Tool Control ECM. The Machine and Tool Control ECM uses these inputs to tell when a hydraulic function has been activated and will turn the Automatic Engine Speed Control (AESC)/one touch low idle back to the current speed dial setting. When only the swing/implement pressure switch is activated, the Machine and Tool Control ECM will release the swing brake. When all three pressure switches are activated, the Machine and Tool Control ECM will energize the straight travel solenoid.
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The main hydraulic system is a negative flow controlled system. The main hydraulic system supplies hydraulic power at high pressures and high flow rates to perform work. Two main hydraulic pumps supply oil to the main control valve group. The individual hydraulic circuits are controlled by valves in the the main control valve group.
The main hydraulic system supplies the following circuits:
- Swing
Travel Left Travel Right
Bucket
Stick Swing Bucket Boom
OUT IN RIGHT LEFT OPEN CLOSE DOWN UP
No.1
330D HYDRAULIC SCHEMATIC NEUTRAL P
aL1 bL1 aR1 bR1
PU2 aR1
aR2 PL2
PU2
PL2 bL4 bL3bL2 bL1
BL3 AL3
The 330D uses a new Kawasaki designed main hydraulic pump group (3) rated at
2 x 280 L/Min (2 x 74 gpm). The pump group is different from the pump group used on the 330C, however it continues using an NFC control system. This pump group is similar to the pump group used on the 345C.
The right pump (4) is driven by the engine via a flexible coupling. The left pump (5) is driven directly off the right pump. Each pump rotating group has its own regulator. The regulators are used to adjust the output flow of the pumps. Each pump rotating group also has its own
pressure tap and pressure sensor.
A power shift PRV (2) is mounted on the top, center of the pump group case. The power shift PRV uses pilot system oil and sends it to the main hydraulic pump regulators as a control signal pressure. The power shift pressure is measured at pressure tap (7).
Additional pump components shown in this photo are:
- Right pump regulator (1)
- Left pump swashplate minimum angle adjustment (6) - Left pump regulator (8)
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This is a view of the right pump regulator. The pump regulator is located above and behind the power shift solenoid and proportional reducing valve. This view shows:
- Right pump negative flow control adjustment (1) - Right pump horsepower control adjustment (2) The left pump regulator has the same adjustment screws.
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The 330D contains one case drain filter (1) for the pump case drain and the swing and travel system case drains and the fan motor case drain. The case drain filter is located in the main pump compartment.
The return hydraulic system oil filter (2) is also located in the pump compartment. The hydraulic oil level sight gauge (3) is located on the rear of the hydraulic tank and is visible in the pump compartment.
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The main control valve group is located in the center of the upper structure of the machine.
The main control valve group receives pilot oil signals from the operator controls in the cab.
Each pilot signal then causes the appropriate control valve to shift in the correct direction.
When a control valve shifts, oil flows from the main hydraulic pumps to the appropriate
hydraulic cylinder or hydraulic motor to perform work. The 330D main control valve is similar to the 330C valve. The valves are:
- Right side NFC signal line (1) - Stick 2 (2)
- Boom 1 (3) - Bucket (4) - Attachment (5) - Right travel (6)
- Right side NFC relief valve drain line (7) - Right side NFC relief valve (8)
- Boom rod end line relief valve (9) - Bucket head end line relief valve (10)
- Straight travel solenoid valve wiring harness (11) - Straight travel valve (12)
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7 8 10
2 3 4 6
9 11 12
Additional valves in the main control valve are:
- Left travel (13) - Swing (14)
- Stick regeneration signal line (15) - Stick 1 (16)
- Boom 2 (17)
- Auxiliary valve for tool control (18) - Main relief valve (19)
- Stick head end line relief valve (20) - Auxiliary valve line relief valve (21) - Left side NFC signal line (22) - Left side NFC relief valve (23)
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14 15
23 16 17 18
19 20 21 22
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The 330D is available with the Heavy Lift option. Heavy Lift provides a means to have increased hydraulic pressure available to help complete heavy lifts, such as larger sewer pipe.
Heavy Lift is activated by pressing the heavy lift switch (1) on the soft switch panel in the operators station. The heavy lift switch is an input to the Machine and Tool Control ECM. The Machine and Tool Control ECM limits engine speed to speed dial 6 and activates the heavy lift solenoid (2), which directs pilot oil to the main relief valve (3) increasing the system pressure.
At the same time, the Machine and Tool Control ECM increases the power shift pressure to decrease the pump output flow. Decreasing the pump output flow provides increased controllability and smooth hydraulic control during a heavy lift operation. Heavy Lift mode limits the pumps to a maximum of approximately 60% of the normal hydraulic horsepower.
Heavy Lift Specs:
- Engine rpm for Heavy Lift is the engine speed dial 6 setting.
- Hydraulic horsepower is limited to 60% of full power during Heavy Lift.
- Main relief maximum pressure during Heavy Lift is 36000 kPa ± 490 kPa (5220 ± 71 psi).
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The 330D has one swing motor (1) that receives oil from the swing control valve. The swing control valve receives pump oil from the left pump. Additional swing motor components shown in this photo are:
- Swing brake release pressure line (2) - Swing drive oil level dipstick (3) - Fine swing solenoid harness (4)
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