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When a JCB 110 Robot—part of JCB’s “Robot” skid-steer loader series—is starved of diesel (for instance, after bogging or fuel depletion), it needs manual priming to remove air from the fuel system. Without this step, the engine won’t fire or may stall repeatedly.
Step-by-Step Fuel System Priming
Terminology Explained
Why This Process Matters
Diesel fuel systems depend on unbroken fuel continuity. Air sections destroy the necessary pressure and interrupt injector performance. By venting injectors and establishing prime, you restore the system’s integrity and allow for reliable ignition and operation.
A Real-World Scenario
A farmer in Australia pulled his 110 Robot free of a muddy bog only to discover it had run completely out of fuel. After refilling the tank, he followed the priming steps: slightly loosen injectors, crank the engine, observe bubbling fuel, and tighten connections in sequence. Once the last injector was secured, the engine roared back to life—no mystery, just proper priming.
Final Notes
Priming the system by venting injectors and using the hand pump is essential when your JCB Robot runs dry. It restores fuel flow and allows the engine to start reliably. Always replace fuel filters first, prime carefully, and crank methodically from nearest to farthest injector. Safe, effective recommissioning keeps your machine running smoothly.
Step-by-Step Fuel System Priming
- Relieve Air via Injectors
Start by slightly loosening the fuel line connections at each injector (beginning with those nearest the fuel tank). This creates an escape path for trapped air.
- Manually Pump Out Air
Operate the hand-primer pump or turn the ignition key to crank the engine slowly. Fuel (along with any air bubbles) should begin expelling from the loosened injector lines.
- Sequentially Tighten Injectors
Once clear, tighten the injector connections closest to the cab first. Continue cranking to purge additional air. Gradually move toward the final injector, leaving that one slightly loosened until no more bubbles appear.
- Final Injector Closure and Engine Start
Tighten the last injector line. Crank the engine again using the key. If primed correctly, the engine should start.
- Fuel Filter Check
Before or during the priming process, ensure you’ve replaced any dirty fuel filters—this keeps airflow minimal and supports clean fuel delivery.
Terminology Explained
- Robot Series: JCB’s line of compact skid-steer loaders, including models like the 110, designed for tight-space versatility.
- Injector Line: Small piping delivering fuel from the injection pump to each cylinder’s injector.
- Hand Priming Pump: A manual pump used to draw fuel through the system—stop air intrusion after a fuel run-out.
- Air Lock: When air pockets in the fuel system interrupt steady fuel delivery, preventing normal engine operation.
Why This Process Matters
Diesel fuel systems depend on unbroken fuel continuity. Air sections destroy the necessary pressure and interrupt injector performance. By venting injectors and establishing prime, you restore the system’s integrity and allow for reliable ignition and operation.
A Real-World Scenario
A farmer in Australia pulled his 110 Robot free of a muddy bog only to discover it had run completely out of fuel. After refilling the tank, he followed the priming steps: slightly loosen injectors, crank the engine, observe bubbling fuel, and tighten connections in sequence. Once the last injector was secured, the engine roared back to life—no mystery, just proper priming.
Final Notes
Priming the system by venting injectors and using the hand pump is essential when your JCB Robot runs dry. It restores fuel flow and allows the engine to start reliably. Always replace fuel filters first, prime carefully, and crank methodically from nearest to farthest injector. Safe, effective recommissioning keeps your machine running smoothly.
