KD Complete Engine Idler Kit for 10 HP Kohler Diesel Air Compressors

The complete idler kit for 10 HP Kohler diesel engine driven air compressors. The idler is what lets an engine driven machine run continuously instead of stopping and restarting: when the tank reaches cut out pressure the control air signal pulls the engine down to idle and unloads the pump, and when pressure falls to cut in it lets the engine back up to working speed.

Without a working idler you get one of two bad outcomes. Either the engine sits at full throttle all day against a loaded pump, burning fuel and heat, or the machine stalls and has to be restarted against pressure every cycle.

Details

• ACP part number: M5604
• Model: KD Complete Idler Kit
• Engine: 10 HP Kohler diesel
• Supplied complete rather than as individual components

When to replace the whole kit

Idlers fail progressively rather than all at once. The air cylinder seals harden and the cylinder stops holding, the spring loses its rate, the tie rod end develops play, and the control tubing goes brittle and cracks at the fittings. By the time one of those has failed outright the others are usually close behind, which is why a complete kit is often the better buy on a machine that has been in service for years. If you have diagnosed a single failed part, the individual spring, air cylinder, tie rod end and 1/4 in nylon control tube are all available separately.

Symptoms of a tired idler

The engine will not drop to idle at cut out and keeps screaming against a closed unloader. Or it drops to idle but is slow and lazy coming back up when the tank calls for air. Or it hunts between the two. Before replacing anything, check that the control air line is clear and that the pilot valve is actually signalling, because a slow signal looks exactly like a worn idler.

Related parts

We also stock engine idler assemblies for the Honda GX390, GX620 and GX630 and for Kohler K series, Magnum, Command and CH440ST gas engines, bullwhip idler throttle controls in three lengths, and CDI pilot valves for the control signal.

Questions

Tell us the engine model from the engine tag and the compressor make and model, and the Warthog Air Compressor Store team will confirm the right idler before you order.

Complete KD engine idler kit for 10 HP Kohler diesel driven air compressors, controlling engine speed between cut in and cut out pressure.