Written for one machine, your U35-4 compact excavator (OEM #RC788-8131-5), this 122-page PDF puts 25 pages of maintenance procedures up front, spanning every service interval from 50 to 3,000 hours. You also get a fluid capacities table, 5 pages of AI system error codes, and troubleshooting for engine, hydraulic, and drive faults. The operations section covers the Two Pattern Selection System, auxiliary port setup, Auto Idle control, and the dozer and attachment functions. Practical numbers sit right where you need them: fill the hydraulic tank to 35 L, change engine oil at 250-hour intervals, and top the fuel tank at 45.1 L. When the machine is down, you get the factory answer on the first try. Every section is bookmarked, so daily checks, error codes, or fluid specs are one tap away on your phone.
What's Inside This Kubota U35-4 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safe Operation | - | Before Operation, Working, After Operation, Safety for Children, Danger, Warning and Caution Labels |
| Dealer Service | - | Warranty Policy, Scrapping the Product, Excavator Serial No., Engine Serial No. |
| Technical Data | - | Operating Weight, Engine Specifications, Performance, Dozer Dimensions, Fluid Capacities |
| Description of Machine Parts | - | Bucket Cylinder, Arm, Boom, Cab, Drive Sprocket, Track Roller, Front Idler |
| Instrument Panel and Control Elements | - | LCD Display, Starter Switch, Warning Lamp, Horn Switch, Control Pedals and Levers |
| Checks Before Start | - | Checking The Devices, Starter Switch, Display Selector Switch, LCD For Normal Operation, Warning Lamp, LCD For Warning, Setting The Clock |
| Operation of the Engine | - | Starting The Engine, Starting The Engine Under Cold Conditions, Starting With An Auxiliary Battery, Observe Following Guidelines When Starting With An Auxiliary Battery |
| Excavator Operation | - | Running-In Of The New Excavator, Do Not Work With Full Engine Rpm's Or Full Loads During The First 50 Working Hours, Oil Change In The Run-In Stage, Operator's Seat, Seat Belt |
| Transporting the Excavator on a Vehicle | - | Loading Procedure, Securing Ramps, Towing the Machine, Tie Down Points |
| Lifting of the Excavator | - | Basics when Lifting, Safety Aspects, Lifting Procedure, Attaching Steel Cables or Straps, Maximum Strength |
| Daily Checks | - | Coolant Level, Fuel Level, Engine Oil Level, Hydraulic Oil Level, Greasing Front Attachments, Greasing Bucket Pin |
| Other Adjustments and Replacements | - | Purging of the Fuel System, Adjustment of Tracks, Changing the Bucket, Fuses, Auxiliary Electric, Slow Blow Fuse |
| Troubleshooting | - | Engine Starting Difficulties, Insufficient Engine Power, Hydraulic System Issues, Drive System Deviation, AI System Errors |
| Recommended Oils | - | Engine Oil Viscosity, Fuel Specifications, EGR Engine Oil Classification |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Grease fitting tightening torque | 98 to 108 N-m | p. 100 |
| Fuel tank capacity | 45.1 L | p. 25 |
| Battery capacity (GP24 (80D26R)) | 55 (at 5H.R(A.H)) | p. 65 |
| Engine oil change | every 250 hrs | p. 75 |
| Engine oil change (regardless of service hours) | every 1 year | p. 70 |
| Operating weight (Canopy) | 3687 kg | p. 25 |
| Operating weight (CAB) | 3833 kg | p. 25 |
| Engine power SAE gross | 18.5 kW (25 HP) | p. 25 |
| Rated speed | 2200 rpm | p. 25 |
| Engine oil volume (with filter) | 5.3 L | p. 92 |
| Hydraulic tank oil volume | 35 L | p. 95 |
| Drive unit oil volume | approx. 0.6 L | p. 93 |
Kubota U35-4 Common Problems This Manual Covers
Kubota U35-4 engine won't start or cranks slowly in cold morning temperatures
Verify the pilot control lock lever is fully in the locked position before cranking; the engine will not start if it is unlocked. Check engine oil level; cold-weather starting requires oil within the correct viscosity range for ambient temperature (see recommended oils section). Battery capacity is 55 Ah, so test voltage before repeated cranking attempts. If fuel has been sitting, draw a small sample from the fuel filter to check for water contamination. Consult the starting procedure.
Manual Section: Engine Starting DifficultiesWater temperature gauge needle moving into red zone during operation
Stop work immediately and idle the engine for 2-3 minutes before shutdown. Check coolant level in the radiator recovery tank (capacity is approx. 0.85 L) and top up with the correct mix if low. Inspect the radiator fins for mud or debris packed between fins and clean with low-pressure water. Confirm the V-belt is properly tensioned and not cracked. Coolant system capacity is approx. 4.3 L (canopy) or 4.7 L (cab). If overheating recurs, check the radiator cap seal and hose clamps per the interval table on page 75.
Manual Section: Water Temperature in Red Zone (Overheating)Boom, arm, or bucket moving slowly with noticeably reduced digging force
Measure hydraulic oil level in the tank; total system volume is 61 L and tank capacity is 35 L, so low oil causes weak attachment response. Confirm the pilot control lock lever is fully unlocked before testing. Look along hose runs and fittings for any wet spots or seeping joints. Also check the air cleaner: a clogged outer element (clean every 200 hrs) starves the engine of air and drops power to the hydraulic pump. Review the hydraulic system checklist.
Manual Section: Hydraulic System IssuesMachine tracking straight but pulling left or right during dozing or traveling
Inspect both tracks for stones or debris jammed between the track links and drive sprocket, and clear by hand with the machine shut down and key removed. Check track tension on both sides; uneven tension causes deviation even on flat ground. Track adjustment procedure and correct tension specification are in the Other Adjustments section. If deviation persists on both clean, evenly tensioned tracks, note whether it occurs only under load or also during free travel and report to your dealer.
Manual Section: Drive System DeviationAI system indicator light flashing on the dashboard display during or after startup
Examine the fuse box for a blown fuse; the AI system indicator flashing is tied directly to a defective fuse per the troubleshooting index. Locate the fuse box (see instrument panel layout), identify the relevant circuit fuse, and replace it with one of identical amperage. Do not substitute a higher-rated fuse. If the light returns after replacement, the circuit has an underlying fault and the machine should go to your dealer before further operation.
Manual Section: AI System Indicator Light FlashesEngine runs but stalls unexpectedly during grading or traveling between job areas
Confirm the fuel level first; tank capacity is 45.1 L and the gauge can read higher than actual on slopes. If fuel is adequate, inspect the air cleaner outer element; at the 200-hour cleaning interval a blocked element causes the engine to load-stall under demand. Drain a small sample from the fuel sediment bowl and check for water or cloudiness, which indicates contamination. Fuel filter cartridge replacement interval is every 500 hrs. See the sudden stop diagnostic checklist.
Manual Section: Engine Suddenly StopsFrequently Asked Questions
What are the recommended service intervals?
The maintenance schedule is organized by interval. Daily checks include coolant and fuel levels, while every 50 service hours you drain water from the fuel tank and separator. Engine oil changes fall at 250 hours and hydraulic oil at 1000 hours. Annual servicing covers electrical wiring and fuses; biennial servicing replaces radiator hoses and coolant.
What fluids and capacities does this machine require?
Capacities vary by system. The fuel tank holds 45.1 L. Engine oil volume with the filter is 5.3 L, and total displacement is 1647 cc. The hydraulic tank takes 35 L, with a whole oil volume of 61 L, and the drive unit gear oil is approximately 0.6 L.
How to troubleshoot engine won't start?
Several causes are common: the pilot control lock lever sitting in "UNLOCK", fuel that is too viscous, or air and water in the fuel system. Move the lock lever to "LOCKED", check the fuel filter and replace it if needed, and drain water from the tank. A nearly dead battery should be recharged.
What are the hydraulic system specifications?
For the U35-4, the maximum theoretical displacement at the AUX1 port is 60.5 L/min, and the maximum attachment pressure reaches 17.2 MPa (175 kgf/cm²). The hydraulic oil tank holds 35 L, with a total system volume of 61 L.
What torque specifications are listed?
After track adjustment is complete, the grease fitting should be tightened. The required tightening torque for that fitting is between 98 and 108 N-m.
What format is this Kubota U35-4 manual in?
This is a 122-page searchable PDF that 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 in the cab.
Document Quality
This document is a scanned PDF with an OCR layer, enabling you to search and copy the full text. While the text is generally crisp and easy to read, some characters show minor pixelation typical of OCR processing. The diagrams and illustrations are raster images, which means they will pixelate if you zoom in significantly, but their labels are consistently readable. Pages are clean, with no noticeable scan artifacts, stains, or skewed content.
Reviews
There are no reviews yet.