Every page here covers one machine: your U35-4 compact excavator, with nothing padded out by unrelated models. A 200-page hydraulic section breaks down the pump, control valve, swivel motor, travel motor, cylinders, and pilot valve in full. The electrical chapters map every wiring circuit, including the ECU, sensors, solenoids, and fuse routing, backed by schematics that trace each path instead of leaving you to guess. Add 50 pages of step-by-step procedures, 6 pages of torque tables, troubleshooting charts, and error code diagnostics. Torque the 1/2-inch hydraulic union nuts to 58.8–63.7 N·m, and refill engine oil to 5.3 L after a filter change. Download it, then search by keyword on a phone, tablet, or laptop to pull the exact figure before you pick up a wrench.
What's Inside This Kubota U35-4 Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | 4-18 | Safety First, in the Interest of Work Safety, Labels Displayed to Promote Work Safety, Main Specifications, Dimensions |
| G General | 19-40 | Checking Excavator Identification, Engine Identification, General Precautions, Handling Precautions for Electrical Parts and Wiring, Types of Oil, Tightening Torques |
| 1 Machine Body | 41-94 | Front Equipment, Upper Swivel, Track Frame, Engine, Operating Lever, Pedal |
| 2 Engine | 95-99 | Specifications, External Dimensions, Performance Curve |
| 3 Hydraulic System | 100-299 | Pump, Control Valve, Swivel Motor, Travel Motor, Hydraulic Cylinder, Pilot Valve |
| 4 Electrical System | 300-432 | Reading the Electrical Circuit Diagrams, Electronic Device Layout, Wiring Circuit, Troubleshooting, Checks, Meter Panel Operating Procedure |
| 5 Cabin | 433-511 | Air Conditioning System, Wiper, Maintenance and Service Related Specifications, Inspecting and Charging the Refrigerant System, Cabin Removal and Mounting |
| Electrical Circuit Diagram | 512 | Alternator, Battery, Fuses, ECU, Sensors, Solenoids |
| Connector Chart | 513-514 | A/C_Fan_Switch, Ecu(Main), Sensor_Fuel, Solenoid(Lever_Lock), Travel_Pressure_Switch, Wipermotor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General Use Screws, Bolts and Nuts (M10, 9T) | 61 to 70 N·m | p. 34 |
| Stud Bolts (M10, Ordinariness) | 25 to 31 N·m | p. 34 |
| Engine oil (when replacing filter) | 5.3 L (1.4 U.S. gal.) | p. 33 |
| Radiator coolant (Canopy spec.) | 4.3 L (1.1 U.S. gal.) | p. 33 |
| Coolant change | every 2 years | p. 39 |
| Engine oil change | every 500 hrs | p. 39 |
| Operating weight (CAB) | 3835 kg | p. 17 |
| Engine total displacement | 1647 cc | p. 17 |
| Fuel tank capacity | 45.1 L | p. 17 |
| Engine oil capacity (when replacing filter) | 5.3 L | p. 33 |
| Hydraulic oil total amount | 62 L | p. 33 |
| General use bolts M8 (Ordinariness) torque | 18 to 20 N·m | p. 34 |
Kubota U35-4 Common Problems This Manual Covers
Kubota U35-4 hydraulic system slow or no response, boom and arm won't lift under load
Start with the hydraulic oil level. Total tank capacity is 62 L, with the gauge center at 35.7 L. If it reads low, top up and check every hose fitting for weeping, then torque the 1/4 union nuts to 24.5 to 29.2 N·m (page 35). Work the front operations troubleshooting flow to pin the fault on the pump, control valve, or pilot valve, and rule out the pilot valve before you condemn the main pump.
Manual Section: Hydraulic System Troubleshooting (General, Front Operations, Pilot Valve, Travel, Swivel)Engine won't start or cranks slowly, no fault codes showing on meter panel
Clean and tighten the battery terminals before anything else. Because a locked-out lever signal can block starting, check the lever lock solenoid circuit early. Then work the engine start sequence: confirm the key is registered, check the fuel level (tank capacity 45.1 L), and make sure the fuel water separator was drained within the last 50 hours. Weak cranking? Load-test the battery before chasing electrical faults.
Manual Section: Electrical System Troubleshooting (Engine Start Issues)Meter panel showing engine oil pressure warning light, machine shuts down unexpectedly
Stop the machine immediately. Check the oil level before you restart; capacity with a filter change is 5.3 L. If the level is right, pull the oil pressure sensor connector and measure its resistance. The meter panel troubleshooting chart tells you whether this is a true low-pressure condition or a sensor and wiring fault. Change the engine oil every 500 hours, per the schedule on page 39.
Manual Section: Electrical System Troubleshooting (Meter Panel Edition - Machine Related)Travel system pulling left or right, machine won't track straight on level ground
Compare track tension and undercarriage wear from side to side first. Then move to the travel troubleshooting section and confirm both travel motors get equal pilot pressure. If the pull only shows up at high speed, inspect the travel 2-speed solenoid circuit. Wheel motor oil capacity is 0.6 L per side, so check the final drive for weeping seals.
Manual Section: Hydraulic System Troubleshooting (General, Front Operations, Pilot Valve, Travel, Swivel)Cabin AC blowing warm air, compressor cycling on and off repeatedly
Inspect the AC drive belt deflection first: the acceptable range is 12 to 15 mm (page 460). Measure the magnetic clutch air gap and confirm it sits between 0.30 and 0.65 mm, since a gap outside that range causes clutch slip and the on-off cycling. Stator coil resistance should read 3.0 to 4.0 ohms. If refrigerant looks suspect, recharge to 0.75 to 0.85 kg R134a.
Manual Section: Cabin AC System TroubleshootingAuto idle system not engaging, engine stays at full throttle when controls are released
Confirm the AI switch is active in the cab. Connect to the meter panel and read out any governor sensor or accelerator sensor error codes through the troubleshooting flow. Test the AI pressure switch and inspect the AI motor circuit. Check that the accelerator sensor output is within spec before you touch the governor linkage mechanically.
Manual Section: Electrical System Troubleshooting (Meter Panel Edition - Auto Idling System)Frequently Asked Questions
What are the recommended service intervals?
The manual lays out a full maintenance schedule. Engine oil gets changed every 500 hours and hydraulic oil every 1000 hours. The air filter's outer element should be cleaned every 200 hours and replaced every 1000 hours.
What fluids and capacities does this machine require?
The U35-4 takes API class CJ-4 engine oil, 5.3 L (1.4 U.S. gal.) at a filter change. Total hydraulic oil capacity is 62 L (16 U.S. gal.), and the fuel tank holds 45.1 L (11.9 U.S. gal.) of Diesel Fuel No.2-DS15 or No.1-DS15.
How to troubleshoot engine won't start?
When the engine won't start, check first for a 'Wrong Key' message; if it shows, start with a registered key. Make sure the unload lever isn't up, since that can hold the lever lock switch in. If it is up, lift it and try again. Then check the slow-blow and other fuses, and tighten the GND wire bolts if the ground is loose.
What are the hydraulic system specifications?
The pump, model PVD-15B-36P-9AG5-5300A, is rated at 2200 rpm. Its piston pump P1+P2 delivers a max displacement of 18 + 18 cc/rev and a max useful pressure of 24.5 MPa (250 kgf/cm2, 3550 psi). The P3 gear pump tops out at 19.6 MPa (200 kgf/cm2, 2840 psi).
What format is this Kubota U35-4 manual in?
This is a 514-page searchable PDF, and it downloads the moment you check out. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Can I print this Kubota U35-4 manual?
Yes. Print as many copies as you like; there are no restrictions. Plenty of mechanics just print the section they need and keep it at the machine.
Are electrical wiring diagrams included in this Kubota U35-4 Service Manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
Document Quality
This is a native digital PDF document, ensuring all text is crisp and clear, making it easy to read. You can search the full text of the document and copy content directly. Diagrams and illustrations are a mix; some are sharp vector graphics, while others are clear, high-resolution raster images or photos with readable labels. All pages are clean, free from scan artifacts, stains, or skewed content, and there are no notable blank or filler pages.
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