Doosan DX235N Excavator Service Manual

DOOSAN DX235N Instruction Table of Content:

Safety
Track Excavator Safety …………………………………………………………….. SP000014
Specifications
Specification for DX235NLC ……………………………………………………… SP002177
General Maintenance
General Maintenance Procedures ……………………………………………… SP000016
Standard Torques …………………………………………………………………….. SP000813
Upper Structure
Cabin ………………………………………………………………………………………. SP000943
Counterweight…………………………………………………………………………… SP000940
Fuel Tank………………………………………………………………………………… SP001014
Fuel Transfer Pump …………………………………………………………………. SP000021
Swing Bearing………………………………………………………………………….. SP001109
Swing Reduction Gear ……………………………………………………………… SP000915
Lower Structure and
Chassis
Track Assembly ……………………………………………………………………….. SP000911
Engine and Drive Train
Drive Coupling (Main Pump) …………………………………………………….. SP001069
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment ……….. SP002178
Accumulator……………………………………………………………………………… SP000028
Center Joint (Swivel) ………………………………………………………………… SP001620
Cylinders………………………………………………………………………………….. SP000030
Swing Motor …………………………………………………………………………….. SP001013
Travel Motor…………………………………………………………………………….. SP001621
Gear Pump………………………………………………………………………………. SP000931
Main Control Valve…………………………………………………………………… SP001024
Axial Piston Pump……………………………………………………………………. SP001008
PTO Server ……………………………………………………………………………… SP000933
Remote Control Valve (Work Lever / Joystick) ………………………….. SP001646
Travel Control Valve (with Damper) ………………………………………….. SP001647
Solenoid Valve Assembly………………………………………………………….. SP001622
Breaker EPPR Valve (Opt)……………………………………………………….. SP000192
Hydraulic Schematic (DX225NLC/DX235NLC)…………………………….. SP001057
Electrical System
Electrica System………………………………………………………………………. SP002182
Electrical Schematic (DX180LC/DX225LC/DX225NLC/DX235NLC).. SP000936
Attachments
Boom and Arm………………………………………………………………………… SP000937
Bucket……………………………………………………………………………………… SP000939

Doosan DX235N Manual Instruction Extract:

Remote Control Valve

Structure
The remote control valve contains four push rods, spring holders, spools and return springs, which are in the valve casing. The valve works as a pressure reduction valve.
The housing has six ports, which include input port P, tank port T, and four secondary pressure ports.
The electric horn button is installed in the valve handle.
Gear pump pressure is used for operating control spools.

Function

1. Neutral Position
When the lever is in neutral mode, the spool is pushed upward by return spring. The force of balancing spring, which determines the secondary discharge pressure, is not transmitted to the spool. The input port is closed and the pressure of the output port is the same as the pressure of the tank port T.

2. Control Switch
Pressing of the push rod starts to press the balance spring, whose force is transferred to the spool to connect the P and T ports, transferring the pilot pressure. Output pressure acts on the bottom of the spool and press the spool upwards until it is balanced with the force of the balance spring.
In short, the second pressure (output pressure) changes in proportion to the pressing force of the balance spring.

How to Use The Doosan DX235N Excavator Guide Manual:

This manual provides information for servicing the DX235N Doosan Excavator. All service procedures are broken down into detailed steps, listed in their recommended sequence. The manual uses both photographs and drawings to help locate and itemize components. The table of Contents on the preceding pages is your best tool for finding the service procedure you need. Be certain to observe all Safety information included in these pages.

A schematic of each of the major engine systems is provided at the beginning of the section of the manual devoted to troubleshooting and repairing that particular system.

Basic safety precautions are list in the Safety section of the Doosan DX235N Excavator Service Manual. Additional safety precautions are list in the Safety section of the owner/operation/maintenance publication. Specific safety warnings for all these publications are provided in the description of operations where hazards exist. WARNING labels have also been put on the product to provide instructions and to identify specific hazards.