Doosan DX35Z User Manual

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Copyright Doosan 2006K1025196E Operation and Maintenance Manual

DOOSAN reserves the right to improve its products continuously, delivering the best possible product to the

marketplace. These improvements can be implemented at any time with no obligation to change materials

previously sold. It is recommended that consumers periodically contact their distributors for most recent

documentation on purchased equipment.

This documentation may include attachments and optional equipment not available in your machine's package.

Please call your distributor for additional items that you may require.

Illustrations used throughout this manual are used only as a representation of the actual piece of equipment, and

may vary from the actual item.

Operation and Maintenance Manual

K1025196E

Serial Number 5001 and Up

September 2006

DX35Z

Table of Contents

Questions and Answers:

C
Courtney BaxterAug 23, 2025
What to do if my Doosan DX35Z lack power?
- K
  Kathleen ParkerAug 23, 2025
  If your Doosan Excavators are experiencing a lack of power, several factors could be responsible. These include poor performance due to a worn hydraulic pump, a bad main relief valve, a low level of hydraulic oil, the wrong viscosity hydraulic oil, or a restricted suction filter. Solutions include replacing the hydraulic pump, adjusting the pressure or replacing the valve, adding oil, replacing with correct viscosity oil, or replacing the filter.
T
Timothy WalkerAug 31, 2025
Why is there poor overall performance in my Doosan DX35Z Excavators?
- D
  Denise RossAug 31, 2025
  Poor overall performance in Doosan Excavators may be caused by hydraulic pump failure or a low hydraulic oil level. To resolve this, replace the hydraulic pump or add oil.
H
Heather JohnsonAug 30, 2025
How to fix an oil leak from outside cylinder in Doosan Excavators?
- M
  Michele DukeAug 30, 2025
  An oil leak from the outside of a cylinder in Doosan Excavators can be due to bad hydraulic cylinder seals or a damaged cylinder rod. The solution is to replace the seals or replace the rod.
R
Richard JonesAug 29, 2025
Why is the pressure unstable in Doosan DX35Z Excavators?
- J
  jacqueline04Aug 29, 2025
  Unstable pressure in Doosan Excavators can be due to a damaged pilot poppet seal or the main poppet of the pilot piston sticking. The suggested solutions involve replacing the damaged parts or disassembling, cleaning, and removing surface pitting.
B
Brittney HarrisonAug 28, 2025
What causes a Doosan DX35Z Excavators hydraulic motor to not rotate?
- H
  holly28Aug 28, 2025
  A Doosan Excavators hydraulic motor might fail to rotate due to several reasons: low hydraulic oil, a bad hydraulic pump, an oil leak from inside the hydraulic motor, an overload applied to the output shaft, or low viscosity hydraulic oil. Possible solutions include adding oil, replacing the pump, replacing the motor, locating and removing the cause of the overload, or changing to oil with the correct viscosity.
J
Jacqueline SuarezAug 27, 2025
Why is there poor oil delivery in my Doosan DX35Z?
- J
  Joshua BrownAug 27, 2025
  Poor oil delivery in Doosan Excavators can be attributed to a low hydraulic oil level or a restricted suction filter. To fix this, add oil or clean/replace the filter.
M
Monica RogersAug 27, 2025
Why is there a lack of cylinder power in my Doosan DX35Z Excavators?
- D
  Danny MartinezAug 27, 2025
  A lack of cylinder power in Doosan Excavators can occur if the relief valve pressure is set too low, if there's an oil leak from inside the cylinder, if the cylinder piston or rod is damaged, or if there's an oil leak from inside the control valve. To resolve this, adjust the pressure, replace the cylinder seals, replace the piston or rod, or replace the valve housing assembly.
P
Paula WrightAug 25, 2025
What causes oil leaks in Doosan Excavators?
- J
  Jack JohnstonAug 26, 2025
  Oil leaks in Doosan Excavators can stem from seals leaking or a worn O-ring, or parts sticking due to foreign material. The suggested solution is to replace worn or damaged parts and disassemble, check for damage, and clean the affected components.
S
Susan LeblancAug 25, 2025
Why is there an unusual sound from my Doosan DX35Z Excavators hydraulic pump?
- J
  josepharnoldAug 25, 2025
  An unusual sound from the hydraulic pump in Doosan Excavators can be attributed to several causes: cavitation from a bent suction side hose or clogged suction filter, cavitation from suction side fittings and air in the system due to low oil level, cavitation due to high viscosity oil, pump and engine misalignment, or air in the hydraulic oil. Suggested solutions include replacing the hose and filter, tightening fittings and adding oil, replacing the oil, readjusting the shaft, or bleeding the system.

Doosan DX35Z Specifications

General

Brand	Doosan
Model	DX35Z
Category	Excavators
Language	English

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