Understanding the common Bobcat E35 excavator problems can help you recognize early warning signs, reduce downtime, and avoid expensive repairs.
Bobcat E35 Excavator Problems
1. Hydraulic System Problems
Hydraulic problems are among the most important issues to investigate when a Bobcat E35 loses digging power, moves slowly, or struggles to operate its boom, arm, or bucket.
Common symptoms
- Slow boom, arm, or bucket movement.
- Weak digging force.
- Hydraulic functions that hesitate or operate unevenly.
- Hydraulic fluid leaks around hoses, cylinders, or fittings.
- Hydraulic oil that overheats during extended operation.
Possible causes
Low hydraulic fluid, contaminated oil, clogged filters, damaged hoses, and worn seals can all affect hydraulic performance. More serious problems may involve the hydraulic pump, control valves, or internal leakage in a cylinder.
How to troubleshoot
Start by checking the hydraulic fluid level according to the operator’s manual and inspecting accessible hoses and connections for leaks. Follow the recommended maintenance schedule for hydraulic filters and fluid.
If the oil level is correct but the excavator still operates slowly, a technician may need to test hydraulic pressure and inspect the pump and control valves.
Important: Never use your hands to search for a hydraulic leak. High-pressure fluid can penetrate the skin and cause a medical emergency. Lower attachments safely, shut down the machine, and relieve pressure according to the manufacturer’s procedure before inspection.
Related New Holland TC30 Problems(8 Causes + Solutions)
2. Engine Starting Problems
A Bobcat E35 that cranks slowly, fails to start, or starts intermittently can interrupt work and make the machine unreliable.
Common symptoms
- The engine does not crank.
- The starter clicks without turning the engine.
- The engine cranks but does not start.
- Starting becomes difficult after the machine has been sitting.
- The engine starts and then stalls.
Possible causes
A weak battery, loose battery terminals, corroded electrical connections, a faulty starter, or a charging-system problem can prevent the engine from starting. Fuel-related causes include a clogged fuel filter, contaminated diesel, air in the fuel system, or a fuel supply problem.
Cold weather and overdue maintenance can also contribute to difficult starting.
How to troubleshoot
Check the battery condition and terminal connections first. Confirm that the machine’s safety interlocks and starting procedure are being followed. If the starter operates normally but the engine does not fire, inspect the fuel supply and filters according to the service manual.
Avoid repeatedly cranking the engine for long periods, as this can overheat the starter and drain the battery. Persistent starting problems may require electrical or fuel-system diagnostics.
Related 743 Bobcat Problems(7 Causes + Solutions)
3. Engine Overheating
Engine overheating can reduce performance and cause serious damage if the machine continues running under excessive temperatures.
Common symptoms
- The temperature warning light activates.
- The engine loses power during heavy work.
- Coolant levels drop repeatedly.
- The engine compartment becomes unusually hot.
- The machine shuts down or runs poorly when working for extended periods.
Possible causes
A blocked radiator or cooling system, low coolant, a faulty thermostat, a damaged cooling fan, or a worn drive belt may contribute to overheating. Dust, grass, and other debris can also restrict airflow through the cooling components.
How to troubleshoot
Allow the engine to cool before checking the coolant level. Inspect accessible cooling surfaces and remove accumulated debris using the method recommended by Bobcat. Check for visible coolant leaks and damaged hoses.
Never remove a radiator cap while the engine is hot. If overheating continues after basic checks, have the cooling system inspected before returning the machine to work.
Related Bobcat 873 Problems(9 Causes + Solutions)
4. Track and Undercarriage Wear
The E35’s rubber tracks and undercarriage components experience considerable stress when working on rough terrain, gravel, mud, and construction sites.
Common symptoms
- Tracks slipping or coming off.
- Uneven track wear.
- Excessive vibration while traveling.
- Unusual grinding or clicking noises.
- Reduced travel performance.
Possible causes
Incorrect track tension, worn rollers, damaged idlers, loose components, and debris lodged in the undercarriage can cause problems. Operating frequently on abrasive surfaces or making sharp turns on hard ground can accelerate wear.
Tracks that are too tight may also place unnecessary stress on the undercarriage and drive components.
How to troubleshoot
Inspect both tracks for cuts, missing sections, and abnormal wear. Remove accumulated debris and check for damaged rollers or idlers. Verify track tension using the procedure and specifications in the manual for your machine’s serial number.
Replace severely damaged components and investigate repeated track derailment rather than simply reinstalling the track each time.
Related Bobcat T190 Problems(6 Causes + Solutions)
5. Travel Motor and Weak Track Movement
Some operators may notice that one track moves more slowly than the other or that the excavator struggles to travel uphill.
Although undercarriage problems can produce similar symptoms, the cause may also lie in the hydraulic travel system.
Common symptoms
- One track moves slower than the other.
- The excavator turns unevenly.
- Travel becomes weak under load.
- One side stops moving intermittently.
- Unusual noises come from a final-drive area.
Possible causes
Potential causes include excessive track tension, a restricted hydraulic line, a defective travel motor, internal hydraulic leakage, or a problem with the control valve. A damaged final-drive component may also affect movement.
How to troubleshoot
Check track tension and look for visible obstructions or damage. Compare the symptoms when traveling forward and backward, but do not operate the machine if doing so could create a safety hazard.
If one track remains weak after basic checks, a technician should test the travel circuit and inspect the motor and final drive. Avoid replacing the travel motor without confirming the cause.
Related Bobcat 610 Common Problems(7 Causes + Solutions)
6. Electrical Problems and Warning Codes
Electrical faults can cause intermittent starting, warning lights, unexpected loss of functions, or problems with the machine’s control systems.
Common symptoms
- The instrument panel does not power up correctly.
- Warning lights remain illuminated.
- The engine fails to start consistently.
- Controls or accessories stop working intermittently.
- The machine displays a diagnostic code.
Possible causes
Common possibilities include a weak battery, corroded terminals, damaged wiring, blown fuses, faulty relays, or defective sensors. On electronically controlled models, a fault may also involve a controller or communication circuit.
How to troubleshoot
Inspect accessible wiring and battery connections for corrosion, loose fittings, or damage. Check fuses against the correct diagram rather than replacing them with higher-rated alternatives.
Related Bobcat Zero Turn Mower Problems(9 Common + Solutions)
7. Swing or Slewing Problems
The swing system allows the upper structure to rotate relative to the undercarriage. Problems here can make positioning the bucket difficult and reduce productivity.
Common symptoms
- The upper structure rotates slowly.
- Swing movement becomes jerky.
- The machine struggles to rotate under load.
- Unusual noises occur during rotation.
- The upper structure continues rotating farther than expected after the control is released.
Possible causes
Potential causes include hydraulic pressure problems, worn swing motor components, control valve faults, restricted hydraulic lines, or a mechanical issue in the swing mechanism. An engaged swing lock can also prevent rotation on applicable configurations.
How to troubleshoot
Confirm that any swing lock is disengaged and check for obvious obstructions. If the swing remains slow or irregular, have the hydraulic circuit and swing components inspected.
Do not attempt to adjust pressure-relief valves without the correct service procedure and testing equipment.
Related Bobcat S250 Skid Steer Problems(9 Causes + Solutions)
8. Poor Digging Performance
An E35 that struggles to dig may have an underlying hydraulic problem, but the issue is not always a mechanical failure.
Common symptoms
- The bucket struggles to penetrate the ground.
- The boom or arm feels weak.
- Digging cycles take longer than usual.
- The machine stalls or loses momentum under load.
Possible causes
Low hydraulic fluid, reduced pump output, incorrect engine speed, worn bucket teeth, or difficult ground conditions can affect digging performance. Incorrect operating technique can also make the excavator appear weaker than it is.
How to troubleshoot
Inspect the bucket teeth and replace them when worn. Check fluid levels and confirm that the engine is reaching the appropriate operating speed.
Avoid forcing the bucket through material beyond the machine’s capabilities. If multiple hydraulic functions become weak simultaneously, have the hydraulic system checked for pressure or flow problems.
How to Prevent Bobcat E35 Excavator Problems
Preventive maintenance is generally less expensive than repairing a major component after failure. Follow the maintenance schedule for your particular E35 model and serial number.
Recommended practices include:
- Check fluid levels: Inspect engine oil, coolant, and hydraulic fluid as directed by the operator’s manual.
- Maintain the cooling system: Keep the radiator and other cooling surfaces free of debris.
- Inspect hydraulic hoses: Look for leaks, abrasion, damaged fittings, and deteriorating hoses.
- Maintain the undercarriage: Remove packed mud and debris, inspect the tracks, and verify tension.
- Grease lubrication points: Follow the specified intervals for the boom, arm, bucket linkage, and other applicable points.
- Replace filters on schedule: Use the correct filters and fluids for the specific machine.
- Investigate warning codes promptly: Record diagnostic information instead of ignoring warning lights.
- Inspect before operating: Look for fluid leaks, damaged components, loose fittings, and abnormal track wear.
Bobcat provides model-specific operation and maintenance manuals with the correct procedures and service requirements.
Is the Bobcat E35 a Reliable Excavator?
The Bobcat E35 can be a practical compact excavator for contractors, landscapers, and property owners who need a machine for everyday digging and site preparation. However, its reliability depends on maintenance history, operating conditions, operator technique, and the condition of individual components.
When buying a used E35, inspect the hydraulic system, engine, undercarriage, swing mechanism, and electrical controls. Check service records and operate the machine long enough to identify leaks, unusual noises, overheating, or weak movement.
Pay particular attention to the machine’s serial number because service procedures and parts can differ between production versions.
There is not enough evidence to conclude that every E35 suffers from a particular widespread defect. The problems discussed above are potential failure points and troubleshooting concerns, not proof of a model-wide reliability issue.
FAQs
What is the most common problem with the Bobcat E35?
Hydraulic performance issues, starting difficulties, undercarriage wear, and electrical faults are all possible concerns. The most likely problem depends on the machine’s age, operating hours, maintenance history, and symptoms.
How many hours will a Bobcat E35 last?
There is no single guaranteed service life. A well-maintained machine operated within its rated capabilities can last substantially longer than a poorly maintained one. Service records and component condition are more useful than operating hours alone when evaluating a used excavator.
Why does my Bobcat E35 have weak hydraulics?
Possible causes include low or incorrect hydraulic fluid, restricted filters, reduced pump output, internal leakage, or a control valve problem. Begin with basic checks and use a qualified technician for hydraulic pressure testing.
Is the Bobcat E35 expensive to repair?
Repair costs vary considerably. Routine servicing and minor hose repairs are generally less expensive than rebuilding a hydraulic pump, replacing a travel motor, or repairing major undercarriage components. Obtaining a diagnosis before ordering parts helps avoid unnecessary expenses.
Should I buy a used Bobcat E35?
A used E35 may be a worthwhile purchase if it has a sound maintenance history, healthy hydraulic performance, a serviceable undercarriage, and no unresolved warning codes. Arrange a professional inspection before buying, especially if the machine has high operating hours or visible signs of neglect.
Final words
Most Bobcat E35 problems are easier to manage when identified early. Regular inspections, correct fluids, proper track maintenance, and prompt attention to unusual symptoms can help reduce downtime and extend the excavator’s working life. When a problem involves high-pressure hydraulics, major engine repairs, or electronic controls, use the service information for your exact machine and seek qualified assistance.
