Used Kubota U35 Mini Excavator 3.5 Ton Zero Tail Swing Crawler Digger for Sale

Answer:

The Kubota U35 is a 3.5-3.7 ton class mini excavator known for its zero-tail swing design and powerful Kubota diesel engine. Below are the detailed specifications for the U35-4 model, the most common variant in production since 2019 .

Complete Specifications Table:

Key Dimensions (Working Range):

• Max vertical digging depth: 2,013 mm

• Min turning radius (without swing): 2,250 mm

• Tail swing radius: only 48 mm (1.9 inches) beyond track width on U35-4

Answer:

Zero-tail swing (ZTS) means the excavator’s rear end (counterweight and engine hood) never protrudes beyond the track width during 360° rotation. The Kubota U35-4 takes this further with a tight tail swing design where the counterweight extends merely 1.9 inches (48 mm) beyond the track width, while the engine hood is recessed 5 inches inside the counterweight edge for maximum protection .

Key Benefits and Data:

1. Worksite Safety – Eliminates risk of rear-end collisions with walls, traffic, or workers. The operator no longer has to worry about damage to the excavator or job site structures, even in tight spaces .

2. Space Efficiency – Can work in spaces just wide enough for the machine itself, right up against a wall or fence, and dig a 9-10 foot trench with ease .

3. Protected Components – The engine hood is recessed inside the counterweight so that side panels and engine components are extremely well protected from impact damage .

4. Market Leadership – Kubota has been the world’s #1 selling compact excavator for 20 consecutive years (according to 2024 data), largely due to pioneering zero-tail swing technology .

Design Advantages:

• The U35 combines zero tail swing with independent boom swing and 360° house rotation

• Maintains stability of conventional tail swing machines through compact track width and specially designed counterweight for superb weight distribution

• The 30° angle of the upper track frame helps prevent dirt accumulation and makes cleanup easier

nswer:

With proper maintenance, the Kubota U35’s undercarriage components can achieve extended service life. Below is the comprehensive maintenance schedule based on Kubota recommendations and industry best practices .

Recommended Maintenance Schedule:

Undercarriage Life Expectancy:

Longevity Tips:

• Proper track tension adjustment can extend rubber track life by 50%

• Daily cleaning of undercarriage extends service life by up to 30%

• The undercarriage accounts for approximately 40-50% of lifetime repair costs

• Kubota’s X-frame substructure improves track frame rigidity for demanding high-cycle applications

• The crawler tension spring absorbs shock loads that affect rubber track service life

Answer:

Based on operator feedback, dealer experiences, and equipment forums, here are the most common issues reported for the Kubota U35 series along with diagnostic and repair guidance .

Most Common Issues and Solutions:

Diagnostic Tips from Experienced Technicians:

• The U35-4 features an intelligent fault diagnosis system on the LCD display that shows error codes and maintenance alerts

• If the machine runs rough and loses power when hot, suspect fuel starvation – check filters first before assuming pump failure

• Kubota had three different groups build the U35 control units, so ensure you have the correct schematic and manual for your specific serial number

Cost-Saving Tip:

• The two-piece configuration of boom and dozer cylinder hoses reduces hose replacement time by up to 60% and lowers replacement cost

Answer:

The Kubota U35 features a robust hydraulic system with proportional flow control that allows programming of up to five different oil flow rates for specific attachments directly from the digital control panel – no tools or manual adjustment required .

Compatible Attachments and Specifications:

Key Attachment Features of U35:

1. Proportional Auxiliary Flow Control – A convenient bi-directional rocker switch on the right-hand control lever enables easy operation of hydraulic thumbs, breakers, augers, and other attachments

2. Third-Line Hydraulic Return – Standard system allows oil recirculation directly to the tank without passing through control valves when operating one-way attachments, decreasing back pressure and increasing oil flow efficiency

3. Auxiliary Diverter Valve – Standard feature allows a second hydraulic attachment to be connected with oil flow switched between attachments without disconnecting the primary tool

4. Maximum Auxiliary Flow – 60 L/min (15.8 GPM) at system pressure

Performance Tips:

• Always confirm attachment flow requirements match the U35’s auxiliary output (max 60 L/min)

• Using undersized or oversized attachments can cause sluggish operation or hydraulic overheating

• The float function on the dozer blade (standard feature) enables quick ground finishing without adjusting blade height

Productivity Data:

• The U35 can dig a 9-10 foot trench with ease when working against walls or fences

• With the optional hydraulic angle blade, operators can angle the blade right or left using a thumb-operated rocker switch, eliminating repetitive repositioning when backfilling trenches

• The two-speed travel system (3.0/4.6 km/h) combined with auto down-shift ensures smooth operation when dozing and turning