Air-Operated Pump LL/83834 For Single-Line Lubrication Systems The LL/83834 air-operated pump is a positive-displacement lubrication pump designed for reliable grease delivery in single-line lubrication systems. All models are air-operated and deliver a controlled maximum volume per stroke. The unit integrates solenoid air valves and adjustable solid-state time controls directly into the pump body for precision and efficiency.