Doosan DX225LC Manual de usuario

SP001647

Page 1

Travel Control Valve (with Damper)

SP001647

TRAVEL CONTROL VALVE (WITH DAMPER)

SP001647

Travel Control

Valve (with

Damper)

Edition 1

SP001647

Travel Control Valve (with Damper)

Page 2

MEMO

SP001647

Page 3

Travel Control Valve (with Damper)

Table of Contents

Travel Control Valve (with Damper)

Safety Precautions ............................................... 5

Applicable Models ................................................ 5

General Description.............................................. 7

Theory of Operation ........................................................ 7

Pressure Reducing Valve................................................ 8

Operating Theory of Damper Mechanism ....................... 9

Causes of Faults and Measures......................... 11

Parts List ....................................................................... 12

Specification .................................................................. 14

Torques ......................................................................... 14

Removal ............................................................. 15

Disassembly ....................................................... 16

Cleaning and Inspection (Wear Limits and

Tolerances)......................................................... 18

Reassembly........................................................ 19

Installation .......................................................... 24

Start-up Procedures ........................................... 25

SP001647

Travel Control Valve (with Damper)

Page 4

MEMO

SP001647

Page 5

Travel Control Valve (with Damper)

SAFETY PRECAUTIONS

APPLICABLE MODELS

The contents of this section apply to the following models and

serial number ranges.

CAUTION!

Follow all safety recommendations and safe shop practices

outlined in the front of this manual or those contained

within this section.

Always use tools and equipment that are in good working

order.

Use lifting and hoisting equipment capable of safely

handling load.

Remember, that ultimately safety is your own personal

responsibility.

MODEL SERIAL NUMBER RANGE

DX225LC 5433 and Up

DX225LCA 5167 and Up

SP001647Travel Control Valve (with Damper)

Page 6

SP001647

Page 7

Travel Control Valve (with Damper)

GENERAL DESCRIPTION

Theory of Operation

The damper valve is divided into two areas of operation. There

is the pressure reducing valve (a) and the damper mechanism

(b). The following hydraulic circuit is an example of a remotely

located control valve.

ARS1810L

Figure 1

Reference

Number Description

1 Remote Control Valve

2 Pilot Pump

3 Main Pump

4 Control Valve

5 Hydraulic Motor

6 Hydraulic Cylinder

Reference

Number Description

SP001647Travel Control Valve (with Damper)

Page 8

Pressure Reducing Valve

1. Neutral Condition

If pedal is in neutral, spool is pushed up by return spring

and spring seat. Port (P) is blocked by bottom part of spool

and four operating ports (left forward and backward, right

forward and backward) are connected to port (T) through

inner hole of spool.

2. Half Operation Condition

If pedal is moved, push rod moves down, and they transmit

this force through spring seat and control spring to spool. If

spool is moved, primary pressure is transmitted through an

inner hole of spool to operating port. If lever is stopped in

middle position, compressed control spring force and

secondary pressure transmitted through hole acts at

bottom part of spool, balance is maintained by hydraulic

force acted upward, and then this pressure is transmitted

to traveling spool of control valve. That is, primary pressure

is transmitted to operating port as secondary pressure

equivalent to control spring force compressed by spool.

3. Full Operating Condition

If pedal is moved to a maximum, bottom part of push rod

presses spool seat to a maximum, and compresses control

spring to a maximum. Primary pressure is transmitted

through inner hole of spool to operation port, secondary

pressure transmitted through spool overcomes control

spring force and pushes spool up, but spool is restricted by

push rod and does not move any more. That is, when

pedal lever is moved to a maximum, control spring does

not function, spool is restricted by push rod, and then

primary pressure equalizes to secondary pressure.

SP001647

Page 9

Travel Control Valve (with Damper)

Operating Theory of Damper Mechanism

1. Operation When Operating Lever

When pushing pedal, pushing force pushing push rod and

spool presses cylinder, return spring and hydraulic oil in

cylinder is compressed, piston coming down with push rod

compresses vibration prevention chamber of lower part, oil

of vibration prevention chamber of lower part is flowed

through orifice to oil pressure vibration prevention chamber

of upper part of low pressure, at this time, ball check valve

becomes closing condition because high pressure

operates to vibration prevention chamber of lower part.

2. Operation When Operating Lever In Neutral Condition

Climbing restoring force acting on push rod, raises piston

in oil pressure prevention chamber and compresses upper

oil pressure prevention chamber. This compression

operation of upper oil pressure prevention chamber

prevents the push rod from quickly rising by restoring

spring, and the damping force is generated.

Figure 2

Reference

Number Description

1 Push Rod

2Orifice

3Piston

4 Piston Chamber

1 Neutral Position

2 Maximum Operating Angle 12.4"

Reference

Number Description

SP001647Travel Control Valve (with Damper)

Page 10

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