Troubleshooting Ride Control Failure on the New Holland LB110 Backhoe Loader

[MikePhua]

The LB110 and Its Ride Control System
The New Holland LB110 is a versatile backhoe loader developed in the early 2000s by New Holland Construction, a division of CNH Industrial. Designed for mid-range excavation, trenching, and material handling, the LB110 features a turbocharged diesel engine, four-wheel drive, and a hydraulic ride control system that enhances operator comfort and load stability during travel.
Ride control works by integrating a nitrogen-charged accumulator into the loader’s lift circuit. When activated, it absorbs shock loads from the front bucket, reducing bounce and improving control at higher speeds. This system is especially valuable when transporting full buckets across uneven terrain, minimizing spillage and wear on the loader arms.
Terminology and Component Notes
- Ride Control: A hydraulic damping system that cushions loader movement during travel.
- Accumulator: A pressurized chamber containing nitrogen and hydraulic fluid, used to absorb shock loads.
- Solenoid Valve: An electrically actuated valve that opens or closes hydraulic flow based on switch input.
- Lift Circuit: The hydraulic pathway that controls the raising and lowering of the loader arms.
- Fuse Panel: The electrical distribution block that protects circuits and powers control systems.
Symptoms of Ride Control Failure
When ride control fails, the machine may feel stiff or overly bouncy during travel. Operators often notice increased jarring when crossing rough ground, and bucket loads may spill more easily. In the LB110, failure typically presents as a complete loss of damping, with no change in behavior when the ride control switch is toggled.
Common symptoms include:

• No response when activating the ride control switch
  
• Loader arms feel rigid and transmit shock directly to the cab
  
• Accumulator shows no pressure or fluid movement
  
• Fuses appear intact but system remains inactive
  
• No audible change in hydraulic tone when switch is engaged
  

One operator reported checking the fuse panel first, finding no blown fuses, but was unsure where to look next. This is a typical starting point, but the system’s complexity requires deeper inspection.
Diagnostic Strategy and Inspection Points
To isolate the fault:

• Verify that the ride control switch is sending voltage to the solenoid valve. Use a multimeter to test continuity and voltage output.
  
• Locate the solenoid valve in the loader lift circuit. It may be mounted near the hydraulic control block or accumulator.
  
• Check the solenoid coil for resistance. A failed coil will show open circuit or unusually high resistance.
  
• Inspect the accumulator for pressure. If the nitrogen charge is depleted, the system cannot absorb shock loads.
  
• Examine hydraulic lines for leaks or blockages. A pinched or clogged line can prevent fluid movement.
  
• Confirm that the loader arms are not locked out by a mechanical override or safety interlock.
  

In one documented case, the solenoid valve had failed internally, and although the switch and fuse were functional, the valve never opened. Replacing the valve restored full ride control function.
Accumulator Maintenance and Recharge Procedure
The accumulator is a critical component and must be maintained properly. Over time, nitrogen can leak through seals or be consumed during operation.
To recharge:

• Use a nitrogen charging kit with a compatible Schrader valve fitting
  
• Connect the kit to the accumulator and slowly pressurize to manufacturer spec (typically 500–800 psi)
  
• Monitor pressure with a calibrated gauge
  
• Do not use compressed air or oxygen, as these pose explosion risks
  
• Inspect for leaks using soapy water or ultrasonic detectors
  

If the accumulator is damaged or leaking internally, it must be replaced. Attempting to weld or repair the shell is unsafe and not recommended.
Electrical System Checks and Fuse Integrity
Even if fuses appear intact, corrosion or poor contact can prevent current flow. Remove and inspect each fuse, clean terminals with contact cleaner, and reseat firmly. Check the fuse rating against the service manual to ensure proper amperage.
Also inspect:

• Ground connections near the cab and hydraulic block
  
• Wiring harness for chafing or rodent damage
  
• Relay function if applicable to the ride control circuit
  

One technician found that a loose ground wire near the loader valve block caused intermittent ride control failure. After tightening and cleaning the terminal, the system resumed normal operation.
New Holland’s Loader Legacy and LB110 Market Impact
New Holland Construction has produced backhoe loaders since the 1960s, with the LB series representing a modernized approach to operator comfort and hydraulic refinement. The LB110 was part of a global push to compete with CAT, JCB, and Case in the mid-size backhoe market.
Sales of the LB110 were strong in Europe, Australia, and Latin America, with thousands of units deployed in roadwork, agriculture, and utility sectors. Its ride control system was a key selling point, offering smoother travel and reduced fatigue for operators covering long distances.
Conclusion
Ride control failure in the New Holland LB110 is often electrical or hydraulic in nature, and requires a methodical approach to diagnose. From solenoid valves to accumulators, each component plays a role in delivering smooth, stable loader performance. With proper inspection, maintenance, and targeted repair, the system can be restored—bringing back the comfort and control that define the LB110’s reputation. In the world of backhoe loaders, ride control isn’t just a luxury—it’s a working advantage.