Troubleshooting the Starter Circuit on the 2007 New Holland L170

[MikePhua]

The New Holland L170 and Its Role in Compact Construction
The New Holland L170 skid steer loader was introduced in the mid-2000s as part of New Holland’s push to expand its compact equipment lineup. New Holland, a brand under CNH Industrial, has roots dating back to 1895 and has long been recognized for its agricultural and construction machinery. The L170 was designed for versatility in tight spaces, offering a rated operating capacity of approximately 700 kg (1,550 lbs) and a gross engine power of around 50 horsepower.
With thousands of units sold across North America and Europe, the L170 became popular among landscapers, small contractors, and municipal maintenance crews. Its compact footprint, mechanical simplicity, and hydraulic performance made it a reliable choice for tasks ranging from grading and trenching to snow removal and pallet handling.
Starter Circuit Design and Terminology
The starter circuit in the L170 is a conventional 12V system designed to energize the starter motor and crank the engine. It includes:

• Ignition Switch: Sends voltage to the starter relay when turned to the “start” position.
  
• Starter Relay: Acts as an intermediary between the ignition switch and the starter solenoid.
  
• Starter Solenoid: Mounted on the starter motor, it engages the motor’s drive gear with the engine flywheel.
  
• Battery: Supplies power to the entire system.
  
• Ground Circuit: Completes the electrical loop; poor grounding is a common failure point.
  

Terminology annotation:

• Cranking Voltage Drop: A reduction in voltage during engine start, often caused by resistance in cables or terminals.
  
• Solenoid Click: Audible indication that the solenoid is receiving power but may not be engaging the motor.
  
• Continuity Test: A diagnostic method using a multimeter to verify electrical path integrity.
  

Common Failure Symptoms and Diagnostic Strategy
When the L170 fails to start, the issue often lies within the starter circuit. Symptoms include:

• No response when turning the key
  
• A single click but no cranking
  
• Intermittent starting behavior
  
• Blown fuses or melted terminals
  

To diagnose the issue, follow these steps:

• Check battery voltage under load; it should remain above 10.5V during cranking
  
• Inspect battery terminals and cables for corrosion or looseness
  
• Test the starter relay by bypassing it with a jumper wire
  
• Verify continuity between ignition switch and relay
  
• Check ground connections from battery to frame and engine block
  
• Remove and bench-test the starter motor if necessary
  

In one case, a contractor in Ohio reported that his L170 would not crank despite a new battery. The issue was traced to a corroded ground strap hidden beneath the engine mount. Replacing the strap restored normal function.
Field Anecdotes and Practical Solutions
A technician in Alberta shared a story where an L170 refused to start during a snowstorm. The operator had replaced the ignition switch, but the problem persisted. After tracing the circuit, the technician discovered a faulty relay that had failed due to moisture ingress. Installing a sealed relay and applying dielectric grease to the terminals solved the issue permanently.
Another operator in Georgia installed a push-button bypass switch directly to the starter solenoid as a temporary fix. While not recommended for long-term use, this allowed the machine to remain operational until proper repairs could be made.
Preventative Maintenance and Recommendations
To avoid starter circuit issues, implement the following:

• Clean and tighten battery terminals monthly
  
• Inspect wiring harnesses for abrasion and moisture intrusion
  
• Replace relays and solenoids every 1,500 operating hours or as needed
  
• Use sealed connectors and heat-shrink tubing in high-moisture environments
  
• Keep a wiring diagram and multimeter in the service truck for quick diagnostics
  

For fleet managers, integrating electrical inspections into regular service intervals can prevent costly downtime. Training operators to recognize early signs—such as slow cranking or inconsistent starts—can lead to faster resolution.
Broader Context and Industry Trends
Starter circuit failures are common across compact equipment, especially in older models. As machines age, wiring insulation degrades, and connectors corrode. Manufacturers are now integrating solid-state relays and CAN-bus diagnostics into newer models to improve reliability and simplify troubleshooting.
In 2021, a rental company in Texas reported a 20% reduction in service calls after retrofitting their fleet with upgraded starter harnesses and sealed relays. This proactive approach is gaining traction among high-utilization operations.
Conclusion
The 2007 New Holland L170 remains a dependable skid steer loader, but like all machines, it requires attention to its electrical systems. Starter circuit issues can be frustrating, but with a structured diagnostic approach and preventative care, they can be resolved efficiently. Whether clearing snow or grading a driveway, the L170 continues to serve as a compact powerhouse—provided its circuits are kept clean, tight, and dry.