Doosan DX225LC Manual
  1. Manuals
  2. Brands
  3. Doosan Manuals
  4. Excavators
  5. DX225LC
  6. Manual

Doosan DX225LC Manual

Travel control valve (with damper)
Hide thumbs Also See for DX225LC:
Table of Contents

Advertisement

Quick Links

SP001647
TRAVEL CONTROL VALVE (WITH DAMPER)
SP001647
Travel Control
Valve (with
Damper)
Edition 1
Travel Control Valve (with Damper)
SP001647
Page 1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DX225LC and is the answer not in the manual?

Questions and answers

Related Manuals for Doosan DX225LC

Summary of Contents for Doosan DX225LC

  • Page 1 SP001647 TRAVEL CONTROL VALVE (WITH DAMPER) SP001647 Travel Control Valve (with Damper) Edition 1 Travel Control Valve (with Damper) SP001647 Page 1...
  • Page 2 MEMO Travel Control Valve (with Damper) SP001647 Page 2...

  • Page 3: Table Of Contents

    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 ...............
  • Page 4 MEMO Travel Control Valve (with Damper) SP001647 Page 4...

  • Page 5: Safety Precautions

    Remember, that ultimately safety is your own personal responsibility. APPLICABLE MODELS The contents of this section apply to the following models and serial number ranges. MODEL SERIAL NUMBER RANGE DX225LC 5433 and Up DX225LCA 5167 and Up Travel Control Valve (with Damper) SP001647 Page 5...
  • Page 6 Travel Control Valve (with Damper) SP001647 Page 6...

  • Page 7: General Description

    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...

  • Page 8: Pressure Reducing Valve

    Pressure Reducing Valve 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.

  • Page 9: Operating Theory Of Damper Mechanism

    Operating Theory of Damper Mechanism 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...
  • Page 10 Travel Control Valve (with Damper) SP001647 Page 10...

  • Page 11: Causes Of Faults And Measures

    CAUSES OF FAULTS AND MEASURES At times it may be difficult to pinpoint the source of the problem. The following table lists some of the possible problems, possible causes and remedies. Refer to this table for possible causes and remedies to assist in correcting the sometimes difficult problems.

  • Page 12: Parts List

    Parts List Figure 3 Travel Control Valve (with Damper) SP001647 Page 12...
  • Page 13 Reference Reference Description Description Number Number Body (1) O-ring Body (2) Rod Seal Plug Dust Seal Plug Cover Spring Seat Hex Socket Head Bolt Spring Shim Bushing Spool Camshaft Stopper Set Screw Spring Set Screw Spring Pin Hex Nut O-ring Bellows Push Rod Piston...

  • Page 14: Specification

    Specification 112.6 25 1.5 Operating Torque 91.8 46.4 7.5 1 Secondary Pressure 1 0.5 4.8 0.5 5.5 Rush Rod Strike (mm) FG013534 Figure 4 Travel Control Valve Specification Type Pilot Control (With Damper) 25 kg/cm @ 4.8 mm Stroke Pressure / Stroke (356 psi @ 0.1890 in Stroke) Weight 7.8 kg (17 lb)

  • Page 15: Removal

    REMOVAL Park on firm and level ground. Lower front attachment (bucket) to ground. Shut down engine. Set safety lever on "RELEASED" position. Turn starter switch to "I" (ON) position. WARNING when performing inspection WARNING! 190-00695A FG014348 engine must running while performing Figure 5 maintenance, always use extreme caution.

  • Page 16: Disassembly

    DISASSEMBLY Remove bellows (32). Figure 7 Remove set screw (29) from cam (26). Figure 8 Remove cam shaft (28) from cam (26). Figure 9 Remove hex nut (31) and set screw (30) from cam (27). Figure 10 Travel Control Valve (with Damper) SP001647 Page 16...
  • Page 17 Remove hex socket head bolt (25) and cover (24) from each body (1 and 2). Figure 11 Figure 12 Remove push rod assembly from body (2). Figure 13 Remove body (2) from body (1). Figure 14 Travel Control Valve (with Damper) SP001647 Page 17...

  • Page 18: Cleaning And Inspection (Wear Limits And Tolerances)

    Remove damper spool assembly and spring (10) from body (1). Figure 15 Figure 16 Remove plug (3 and 4) and O-rings (12 and 34). Figure 17 CLEANING AND INSPECTION (WEAR LIMITS AND TOLERANCES) For general cleaning and inspection procedures, refer to "General Maintenance Procedures"...

  • Page 19: Reassembly

    REASSEMBLY Insert spring (10) into body (1). Figure 18 Assemble in proper order, damper spool (8), shim (7), spring (6), spring seat (5) and stopper (9). Figure 19 Install damper spool assembly into body (1). Figure 20 Assemble body (2) onto body (1). Figure 21 Travel Control Valve (with Damper) SP001647...
  • Page 20 Assemble rod seal (22), dust seal (23) and O-ring (21) into plug (20). Figure 22 Figure 23 Assemble seal (15), piston (33), steel ball (16), plate (18), spring (17) and snap ring (19) into push rod (13). Figure 24 Assemble push rod and plug. Figure 25 Travel Control Valve (with Damper) SP001647...
  • Page 21 Install push rod assembly into body (2). Figure 26 Install bushing (27) in cover (24) using jig. Figure 27 10. Assemble cover (24) onto each body (1 and 2) and install hex socket head bolt (25) using torque wrench. Figure 28 Travel Control Valve (with Damper) SP001647 Page 21...
  • Page 22 11. Install set screws (30) and hex nut (31) into cam (26) and tighten it. Figure 29 Figure 30 12. Position cam (26) on cover (24) and insert cam shaft (29) using hammer. Figure 31 13. Install set screw (29) in cam (26) and tighten it using torque wrench.
  • Page 23 14. Check cam balance. Figure 33 15. Install bellows. Figure 34 Figure 35 Travel Control Valve (with Damper) SP001647 Page 23...

  • Page 24: Installation

    INSTALLATION Position pedal valve (1, Figure 36) on cabin floor plate and install four bolts and washers (2). FG003016 Figure 36 Install pedal brackets (3) and levers (4, Figure 37) on pedal valve and install four bolts and washers (2). Install rubber boots (1, Figure 37).

  • Page 25: Start-Up Procedures

    START-UP PROCEDURES Start engine and set throttle at "LOW IDLE." Set safety lever on "UNLOCK" position. HAOB290L Figure 39 Slowly push and pull both travel lever about five times without a load to vent air from pilot lines. HAOB903L Figure 40 Travel Control Valve (with Damper) SP001647 Page 25...
  • Page 26 Travel Control Valve (with Damper) SP001647 Page 26...
  • Page 27 SP001622 SOLENOID VALVE ASSEMBLYSP001622 Solenoid Valve Assembly Edition 1 Solenoid Valve Assembly SP001622 Page 1...
  • Page 28 MEMO Solenoid Valve Assembly SP001622 Page 2...
  • Page 29 Table of Contents Solenoid Valve Assembly Safety Precautions ..........5 Applicable Models ..........5 5-Solenoid Valve ..........6 Parts List ................. 6 Functions of 5-Solenoid Valve Assembly Package ..7 Assembly Diagram and Tools Required ......9 Cautions During Disassembly and Reassembly ... 10 Solenoid Valve Diagram ..........
  • Page 30 MEMO Solenoid Valve Assembly SP001622 Page 4...

  • Page 31: Safety Precautions

    Remember, that ultimately safety is your own personal responsibility. APPLICABLE MODELS The contents of this section apply to the following models and serial number ranges. MODEL SERIAL NUMBER RANGE DX225LC 5433 and Up DX225LCA 5167 and Up Solenoid Valve Assembly SP001622 Page 5...

  • Page 32: 5-Solenoid Valve

    5-SOLENOID VALVE Parts List Components used for the solenoid valve package are the same as in the parts list below. FG013248 Figure 1 Reference Description Sizes Quantity Remarks Number Block Body 79x82x272.5 1-A0098-07-0 Solenoid valve QF-S3A-0421 C1, C2, C3, C4, C5 Coil VDL24VDC C1, C2, C3, C4, C5...

  • Page 33: Functions Of 5-Solenoid Valve Assembly Package

    Functions of 5-Solenoid Valve Assembly Package This solenoid valve assembly package have the following functions. Pilot cut-off Breaker pressure supply High travel speed Main pressure increase Breaker mode selection Functions and Operations of Solenoid Valves Reference Function Operations Remarks Number Provides pressure and oil coming from the pilot pump Pilot Cut-off for the pilot pressure supply solenoid valve to drive...
  • Page 34 Breaker pressure supply Pressing the breaker switch on the joystick operates the breaker solenoid valve (C2) to supply pilot pressure to the option valve of the main control valve. The pressure switches the spool of the option valve, which transfers pressure and oil from the main pump to the breaker system for excavation.II High travel speed control...

  • Page 35: Assembly Diagram And Tools Required

    Assembly Diagram and Tools Required Table 1 shows assembly torques recommended for components of the solenoid valve package. Designated tools and torques should be followed. FG013248 Figure 2 Reference Description Sizes Torques (kg/cm) Tools Number Solenoid valve UNF7/8 - 14" 200 ±...

  • Page 36: Cautions During Disassembly And Reassembly

    Cautions During Disassembly and Reassembly Wipe dust and dirt in the area where disassembly and reassembly will be performed. For disassembly and reassembly, standard torques and tools stated in Table in should be used. The directions of disassembly and reassembly are same as the "Disassembly Direction"...

  • Page 37: Solenoid Valve Diagram

    Solenoid Valve Diagram Figure 3 Solenoid Valve Assembly SP001622 Page 11...

  • Page 38: Check Points And Solutions For Problems

    Check Points and Solutions for Problems Symptoms Causes How to Check Solutions Remove Foreign Disassemble the solenoid valve concerned and contaminant, substance, dirt, check if there are any contaminant such as wash, and dust in solenoid foreign substance and sludge between the case assemble valve and the spool.

  • Page 39: 2-Solenoid Valve

    2-SOLENOID VALVE Parts List 2-Solenoid valve package includes parts described in the table below. FG013249 Figure 4 Reference Description Size Quantity Remarks Number Block Body 57x73x105 1-A1097-07-0 Solenoid Valve QF-S3A-0421 C1, C2 Solenoid Valve Assembly SP001622 Page 13...

  • Page 40: Assembly Diagram And Tools Reguired

    Assembly Diagram and Tools Reguired The assembly torque of each part in the solenoid valve package is described in the table below. Observe the specified torque values using the right tool. FG013249 Figure 5 Reference Torques Description Sizes Tools Number (kg/cm) Solenoid Valve UNF7/8-14"...

  • Page 41: Cautions During Disassembly And Reassembly

    Cautions During Disassembly and Reassembly Clean up the surrounding area to remove any foreign substances before disassembly and re-assembly. Make sure to observe the assembly torques and tools specified in table of page8 when disassembling and re-assembling parts. Follow the directions described in the above drawing for disassembly and re-assembly.

  • Page 42: Solenoid Valve Diagram

    Solenoid Valve Diagram Coil Nut Coil Cap Housing Tube & Retainer Case FG007535 Figure 6 Troubleshooting Guide Symptom Checkpoints Descriptions Remedy 1. Foreign materials, 1. Disassemble valve and check if any foreign Remove foreign contaminants in materials or contaminants such as sludge lodged materials and valve between case and spool.
  • Page 43 SP000192 BREAKER EPPR VALVE (OPT)SP000192 Breaker EPPR Valve (Opt) Edition 1 Breaker EPPR Valve (Opt) SP000192 Page 1...
  • Page 44 MEMO Breaker EPPR Valve (Opt) SP000192 Page 2...
  • Page 45 Table of Contents Breaker EPPR Valve (Opt) Safety Precautions ..........5 Applicable Models ..........5 Structure ............... 7 Numbers and Names of Parts ......... 7 Functions and Operation ........8 Cautions for Operation ......... 8 Maintenance Instructions........9 Maintenance ..............9 Disassembly ..............
  • Page 46 MEMO Breaker EPPR Valve (Opt) SP000192 Page 4...

  • Page 47: Safety Precautions

    The contents of this section apply to the following models and serial number ranges. MODEL SERIAL NUMBER RANGE DX140W 5001 and Up DX160W 5001 and Up DX210W 5001 and Up DX225LC 5001 and Up DX225NLC 5001 and Up DX225LCA 5167 and Up DX255LC 5001 and Up DX300LC 5001 and Up...
  • Page 48 Breaker EPPR Valve (Opt) SP000192 Page 6...

  • Page 49: Structure

    STRUCTURE Numbers and Names of Parts Figure 7 Reference Reference Description Description Number Number Solenoid Valve Casing Spring Sleeve O-ring Spool O-ring Breaker EPPR Valve (Opt) SP000192 Page 7...

  • Page 50: Functions And Operation

    FUNCTIONS AND OPERATION The proportional reducing valve shall be adjusted that its reduced pressure is proportional to the current of the solenoid. The proportional solenoid shall be changed with pressure proportional to the electrical input signal. Flow increases corresponding to the force of the solenoid. As the solenoid (1) receives pressure, the spool (4) opens and oil flows from P to A.

  • Page 51: Maintenance Instructions

    MAINTENANCE INSTRUCTIONS Maintenance Bolt Tightening Torque Table 1 shows torques used to tighten bolts of the motor. Make sure that assembly work should be done according to Table 1. Used Torques Bolt Sizes Names (kgf.cm) M 35 Hex bolt 450 ± 50 M 10 Hex bolt 200 ±...

  • Page 52: Disassembly

    Disassembly Determine a place for disassembly. • It should be clean. • Lay a rubber board or a cloth on the table and take care not to damage parts. Remove dust and rust of the proportional pressure reducing valve with cleansing oil. Disassemble the solenoid •...

  • Page 53: Assembly

    Assembly Assembly shall be done in the reverse order of disassembly described above, taking into consideration the following points. • Parts damaged during disassembly should be repaired without fail and spare parts should be prepared in advance. • Every part should be cleaned enough with cleaning oil and dried with compressed air before starting assembly.
  • Page 54 Assemble the spool, the spring, and the pin. FG003693 Figure 13 • The spring and the pin should not be fell off. FG003696 Figure 14 Assemble the solenoid correctly. 426-00266 PART No.: SERIAL No.: FG003697 Figure 15 • Take care not to damage O-rings of the solenoid. FG003698 Figure 16 Breaker EPPR Valve (Opt)
  • Page 55 SP001689 HYDRAULIC SCHEMATIC (DX225LC/DX225LCA)SP001689 Hydraulic Schematic (DX225LC/ DX225LCA) Edition 1 Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 1...
  • Page 56 MEMO Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 2...
  • Page 57 Table of Contents Hydraulic Schematic (DX225LC/DX225LCA) Safety Precautions ..........5 Applicable Models ..........5 DX225LC/DX225LCA ........... 7 Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 3...

  • Page 58: Hydraulic Schematic

    MEMO Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 4...

  • Page 59: Dx225Lc Dx225Lca

    Remember, that ultimately safety is your own personal responsibility. APPLICABLE MODELS The contents of this section apply to the following models and serial number ranges. MODEL SERIAL NUMBER RANGE DX225LC 5433 and Up DX225LCA 5167 and Up Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 5...
  • Page 60 Hydraulic Schematic (DX225LC/DX225LCA) SP001689 Page 6...

  • Page 61: Dx225Lc/Dx225Lca

    2.5bar 500k 500k (FRONT) (REAR) SENSOR SENSOR from PRESS. SWITCH ON #30 LH-HI RH-HI (OPEN) (CLOSE) 177u ENGINE DL06 from JOYSTICK(R) BOTTON Hammer Select from JOYSTICK(R) SWITCH r1~r4 Shear Select to #34 P FG013899 Figure 1 Hydraulic Schematic (DX225LC/DX225LCA) SP001689...
  • Page 62 Electrical System...

This manual is also suitable for:

Dx225lca

Table of Contents

Save PDF