Part of the Doosan Repair Manuals.
All 621 pages of this Doosan DX35Z Shop Manual PDF (OEM #K1025197E) exist to put your track excavator back to work. Inside: a full hydraulic schematic for the DX35Z, complete electrical wiring diagrams, and step-by-step teardown procedures for the main pump, swing motor, travel motor, main control valve, and cylinders. You also get a standard torque section, swing bearing and track assembly service, and specifications for every system from cabin to bucket. Torque the 1/2-inch split flange bolts to 2.1-2.5 kg-m (15-18 ft lb) and set the track roller hardware at 34.5 kg-m; those numbers come straight off the factory pages. No more chasing hydraulic leaks with forum guesses. Bookmarked and keyword-searchable; pull it up on your phone in the shop, jump straight to the section you need, and start wrenching.
What's Inside This Doosan DX35Z Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-52 | Track Excavator Safety |
| Specifications | 53-80 | Specification for DX35Z |
| General Maintenance | 81-118 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 119-150 | Cabin, Fuel Tank, Swing Bearing |
| Lower Structure and Chassis | 151-178 | Track Assembly |
| Engine and Drive Train | 179-188 | Drive Coupling (Main Pump) |
| Accumulator | 191-210 | Safety Precautions, Applicable Models, General Description |
| Cylinders | 211-272 | Safety Precautions, Applicable Models, Construction, Internal Construction, Disassembly Procedures, Internal Component Disassembly Procedure |
| Travel Motor | 273-336 | Safety Precautions, Applicable Models, Instruction, Out Line, Structure of Traveling Motor, Features |
| Main Pump | 337-392 | Safety Precautions, Applicable Models, General, Principal Components and Functions, Piston Pump, Valve Assembly and Relief Valve |
| Main Control Valve | 393-472 | Safety Precautions, Applicable Models, Introduction, Outline, Contents of This Manual, Disassembly and Assembly of the Product |
| Remote Control Valve (Work Lever / Joystick) | 473-490 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Tools and Materials, Disassembly |
| Travel Control Valve | 491-524 | Safety Precautions, Applicable Models, About This Operation Manual, Exemption From Responsibility, Overview, Operation |
| Pedal Valve | 525-548 | Safety Precautions, Applicable Models, General Description, Tools and Materials, Disassembly, Assembly |
| Electrical System | 549-595 | Electrical Schematic (DX35Z) |
| Attachments | 596-621 | Working Attachments, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Torque for split flange connections (1/2" flange size, 5/16" bolt size) | 2.1 - 2.5 kg•m (15 - 18 ft lb) | p. 113 |
| Torque for split flange connections (3/4" flange size, 3/8" bolt size) | 3.0 - 3.7 kg•m (22 - 27 ft lb) | p. 113 |
| Bolt torque | 27 kg•m (200 ft lb) | p. 140 |
| Track Roller (for rubber crawler) Tightening Torque | 34.5 kg•m | p. 173 |
| Lower Roller (for Steel Crawler) Tightening Torque | 34.5 kg•m | p. 173 |
| Engine Rated Power | 27.7 hp @ 2,200 rpm | p. 68 |
| Fuel Tank Capacity | 42 liters | p. 68 |
| Hydraulic Tank Capacity | 40 liters | p. 68 |
| Main Relief Set Pressure | 230 kg/cm2 | p. 68 |
| Operating Weight | 3.7 tons | p. 68 |
| Travel Speed (High) | 4.6 km/h | p. 68 |
| Travel Speed (Low) | 2.6 km/h | p. 68 |
Doosan DX35Z Common Problems This Manual Covers
Doosan DX35Z hydraulic pressure low, decompression valve pressure will not rise, bucket and boom feel weak
Test pump output at the main relief; spec is 230 kg/cm2 on the spec sheet on page 68. If pressure stays low, inspect the main control valve relief, rated at 24.5 MPa per page 400, for a stuck retaining valve or a scored pilot check-valve seat. Replace damaged seals before condemning the pump.
Manual Section: Hydraulics p. 400Hydraulic oil leaking at quick couplers and hose fittings, wet spots under the boom
Wipe fittings clean, run the machine, and trace the fresh leak to its source. Retighten loose quick couplers by hand, then torque split flange bolts to spec: 2.1 to 2.5 kg•m (15 to 18 ft lb) on 1/2 inch flanges per page 113. Replace any hose with a cracked cover or a bulge near the fitting.
Manual Section: Standard Torques p. 113Engine runs hot and hydraulic power drops off after an hour of steady digging
Clean the cooling package with compressed air from the fan side, then check fan belt tension and the air intake screen for debris. Verify coolant and hydraulic oil levels; the hydraulic tank holds 40 liters per the specs on page 68. Top up as needed and recheck temperature under load.
Manual Section: Engine and Drive Train p. 179Rubber tracks loose, throwing a track when turning, rollers wearing fast on one side
Measure track sag and adjust tension at the grease fitting until the track sits snug on the rollers. Inspect idlers and lower rollers for flat spots and leaks, then torque roller mounting bolts to 34.5 kg•m per page 173. Replace any roller that wobbles or weeps gear oil.
Manual Section: Lower Structure and Chassis p. 173Engine cranks slowly or intermittently, gauges flicker, no start on cold mornings
Check battery terminals, ground straps, and the main frame ground for corrosion; clean and retighten. Load-test the charging system at the rated 2,200 rpm listed on page 68, then trace intermittent circuits with the wiring diagram on page 595. Repair chafed harness sections instead of taping over them.
Manual Section: Electrical System p. 595Frequently Asked Questions
What is the fuel tank capacity for the DX35Z?
The fuel tank capacity for the DX35Z excavator is 42 liters (11.1 U.S. gal). p. 135
What is the tightening torque for the fuel tank mounting bolts?
The tightening torque for the fuel tank mounting bolts is 27 kg•m (200 ft lb). p. 140
What is the standard lubricant quantity for the travel motor reduction gear case?
The standard lubricant quantity for the travel motor reduction gear case is 500 cm³. p. 299
What is the recommended interval for changing the reduction gear lubricating oil?
The initial oil change for the reduction gear should be performed after 100 to 250 hours of operation, with subsequent changes every 1000 to 1500 hours. p. 302
What is the tightening torque for the sprocket clamping bolt?
The tightening torque for the sprocket clamping bolt is 11.5 kg•m. p. 176
How is this Doosan DX35Z Shop Manual delivered?
All 621 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Does this Doosan DX35Z manual allow printing?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
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