Doosan DX27Z Excavator Service Manual

Table of Contents :-

Safety
Track Excavator Safety………………………………………………………………. SP001521
Specifications
Specification for DX15/DX18 ………………………………………………………. SP001522
General Maintenance
General Maintenance Procedures……………………………………………….. SP000016
Standard Torques……………………………………………………………………… SP000813
Upper Structure
Lower Structure and Chassis
Track Assembly ………………………………………………………………………… SP001523
Engine and Drive Train
Engine……………………………………………………………………………………… SP001524
Hydraulics
Center Joint (Swivel)………………………………………………………………….. SP001525
Cylinders………………………………………………………………………………….. SP001526
Swing Motor……………………………………………………………………………… SP001527
Travel Motor (With Gear Box)……………………………………………………… SP001528
Pilot Control Valve (Work Lever / Joystick)……………………………………. SP001529
Main Pump……………………………………………………………………………….. SP001530
Main Control Valve ……………………………………………………………………. SP001531
Solenoid Valve………………………………………………………………………….. SP001532
Hydraulic Schematic (DX15/DX18)………………………………………………. SP001681
Electrical System
Electrical System………………………………………………………………………. SP001534
Electrical Schematic (DX15/DX18) ………………………………………………. SP001535
Attachments
Boom and Arm………………………………………………………………………….. SP001536
Bucket……………………………………………………………………………………… SP001550

Doosan DX27Z Manual Instruction Extract:

The piston motor and the shuttle valve are so design that every parts are extremly accurate, clearance between eack parts are very much limited, and parts are much sensitive to contaminations, such as sludge, iron powder, rust, filings, grinding powder, etc.

The performance degradation of the piston motor and the counter balance valve, and the wear in sliding parts may be avoided by keeping the oil clean.

Therefore, adequate filters are required to keep hydraulic fluid in the hydraulic system clean, durable and reliable for long services with less maintenance and inspection. The contamination level should be below NAS Class9.
Filter should be placed at the discharge side of hydraulic pump or at the return side of piston motor.
Filter gradation should be smaller than 10 microns(nominal).

Use filter(S) with a visual indicator by which the contaminations are found from the outside, and with a relief valve which by-passes the oil depending on the clogged condition when the filter element is clogged.
It is recommended that the contamination level of hydraulic fluid should be below NAS Cless 9.

How to Use The Doosan DX27Z Excavator Guide Manual:

This manual provides information for servicing the DX27Z 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 DX27Z 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.