Modulo 4 DX Excavator (K3 - K5 - T5 Main Pump) [PDF]

Zitiervorschau

Main pump of DX Excavator K3 / K5 / T5 Main pump

Jan., 18th . 2007 Overseas P/S Team Docu. No : DXT MPK 0508 – Rev 01

K3 / K5 / T5 Main pump

Applied model T5 : DX140LC,DX225LC (Tong myung) K3 : DX255LC (Kawasaki) K5 : DX300LC (Kawasaki)

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K3 / K5 / T5 Main pump

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K3 / K5 / T5 Main pump  Section drawing

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K3 / K5 / T5 Main pump  Pump schematic

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K3 / K5 / T5 Main pump  Pilot pump section drawing & schematic

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K3 / K5 / T5 Main pump  Proportional valve section drawing & schematic

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K3 / K5 / T5 Main pump  P- Q Curve (DX225LC)

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K3 / K5 / T5 Main pump  P- Q Curve (DX255LC)

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K3 / K5 / T5 Main pump  P- Q Curve (DX300LC)

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K3 / K5 / T5 Main pump  Flow control (Decrease oil flow)

Control valve spools are neutral position ( no working condition), main pump doesn’t need to discharge lots oil.

High nega-con pressure comes up to pilot piston on main pump regulator. The pilot piston makes spool move to decrease oil flow. How? High nega-con pressure

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K3 / K5 / T5 Main pump  Flow control (Decrease oil flow)

Oil tank

High nega-con pressure

C/ V

Under spool neutral position, discharge oil goes to oil tank directly trough small orifice.

Decrease oil flow

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K3 / K5 / T5 Main pump  Flow control (Increase oil flow)

When spool is moved ( for working), main pump should be discharged lots oil to control valve for supplying oil to actuator.

Low nega-con pressure comes up to pilot piston. The pilot piston makes spool move to increase oil flow. How?

Low nega-con pressure

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K3 / K5 / T5 Main pump  Flow control (Increase oil flow)

Oil tank

Low nega-con pressure C/ V

Actuator Spool is switched, all of discharge oil goes to actuator, So nega con pressure is drop.

Increase oil flow

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K3 / K5 / T5 Main pump  Power control (Decrease oil flow)

The com-pen spool senses both pump system pressure. (average pressure of both pump is applied on com-pen spool) If average pressure over come spring set force, oil flow is decreased. How?

com-pen spool

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K3 / K5 / T5 Main pump  Power control (Decrease oil flow)

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K3 / K5 / T5 Main pump  Power control (Increase oil flow)

The com-pen spool senses both pump system pressure. (average pressure of both pump is applied on com-pen spool) If average pressure is decreased, the compen piston is moved to left side. oil flow is increased. How?

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K3 / K5 / T5 Main pump  Power control (Increase oil flow)

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K3 / K5 / T5 Main pump  Power shift (1)

When pilot pressure is come to com-pen piston behind chamber, it will help com-pen piston moving. If no pressure there, moving com-pen piston is a little bit harder then high pressure. If there are no pilot pressure there, in order to move the com-pen piston, more high system pressure is applied on blue chamber, isn’t it? Now. Let’s compare that high pressure and low pressure on behind chamber (Red) Controlling for decrease oil. - Standard mode : System pressure + Pilot pressure - Power mode : System pressure only

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K3 / K5 / T5 Main pump  Power shift (2)

Input current

2nd pressure

2nd pressure

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K3 / K5 / T5 Main pump  Power shift (3)

* Data from DX300LC 21

K3 / K5 / T5 Main pump  Power shift (4) : Power mode – 150~400 mA (2nd pressure is 0~16 bar)

0 bar (16bar)

150 mA (~400mA)

* Data from DX300LC

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K3 / K5 / T5 Main pump  Power shift (5)

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* Data from DX300LC

K3 / K5 / T5 Main pump  Power shift (6) : Standard mode – 400~600 mA (2nd pressure is 16~32 bar)

16 bar (32bar)

400 mA (600mA)

* Data from DX300LC

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K3 / K5 / T5 Main pump  Power shift (7)

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* Data from DX300LC

K3 / K5 / T5 Main pump  Power shift (8) : Low idle, Auto idle – 600 mA (2nd pressure is 32 bar)

32 bar

600 mA

* Data from DX300LC

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K3 / K5 / T5 Main pump  Power shift (8)

* Data from DX300LC 27

K3 / K5 / T5 Main pump  Power shift (9)

Model

DX140LC

DX225LC

DX255LC

DX300LC

Working mode

Current (mA)

2nd Pressure (bar)

Power

150 ~ 600

1 ~ 32

Standard

250 ~ 600

6 ~ 32

Low engine

600

32

Power

200 ~ 600

0 ~ 28

Standard

300 ~ 600

8 ~ 28

Low engine

600

28

Power

150 ~ 600

0 ~ 31

Standard

300 ~ 600

7 ~ 31

Low engine

600

31

Power

150 ~ 400

1 ~ 16

Standard

400 ~ 600

16 ~ 32

Low engine

600

32

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K3 / K5 / T5 Main pump  Measure point (Power shift)

* Data from DX300LC

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K3 / K5 / T5 Main pump  Max. / Min. flow adjustment.

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K3 / K5 / T5 Main pump  Pressure control (Power control) flow adjustment.

Outer adjust screw

- Flow adjusting (II) – Pressure control

Inner adjust screw

Outer adjust screw

Inner adjust screw

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K3 / K5 / T5 Main pump  Flow control (Nega con control) flow adjustment.

Flow adjust screw

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