Omega Engineering 185-210 DUS, JD 4045 manual CONTROLS-OPERATION and Adjustments

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4.12 CONTROLS-OPERATION AND ADJUSTMENTS

The compressor system is designed to match air supply and engine performance with the demand. The components of the control system are, the blowdown valve, start-run solenoid, compressor inlet valve, pressure regulator and an engine air cylinder.

The start-run valve that is open in the start run position. This allows air to by-pass the pressure regulator and go directly to the compressor inlet valve, closing it and to the engine air cylinder, holding the throttle at idle. When switched to the run position, shutting off the by-pass air. Control air now has to go through the pressure regulator.

The pressure regulator is referred to as a positive type and its operation is proportional to system pressure. As pressure increases it opens, allowing air to pressurize the inlet valve and air cylinder. When there is an air demand, the pressure decreases and the regulator starts to close, relieving the pressure in the inlet valve and air cylinder. An orifice in the regulator bleeds the air out of control line between regulator, engine air cylinder and inlet valve supplies a signal proportional to the system pressure the inlet valve will modulate. With no air demand the pressure rises, the signal air from the regulator closes the inlet valve. When an air demand is present or the pressure falls, the air signal is removed allowing the inlet valve to open to match air demand.

The blowdown valve has two functions in the system. First it prevents excessive pressure in the start and unload modes by bleeding off the small amount of air being drawn in during idle. Secondly it relieves or blows down the system on shutdown. This valve is not adjustable.

ADJUSTMENT

When performing control adjustments care must be taken in regard to safety as the compressor must be running. Be aware of moving parts, as well as, hot items, such as fans, belts and exhaust components.

IDLE OR UNLOAD SPEED ADJUSTMENT (For 100 PSI System)

With the compressor warmed up and all service valves closed, move start-run switch to run position. Air pressure will build to 120 psig. If air pressure is less than 120 psig, adjust regulator up by turning the adjusting screw clockwise. If air pressure is greater than 120 psig, adjust regulator down by turning the adjusting screw counter-clockwise. Check engine speed with a photo tachometer.

If idle speed is not as listed in specifications, adjustment will be required.

Note: If your unit is rated at a higher pressure add 20psi to the working pressure for unload pressure; ex: 150 PSI working = 170 unload.

IDLE SPEED ADJUSTMENT PROCEDURES

On the injection pump throttle arm, there are two adjusting screws. The air cylinder connected to the throttle arm, this air cylinder moves throttle to increase and decrease engine speed with air demand. When adjusting idle speed, the air cylinder should be fully extended moving throttle arm towards front of engine. To adjust idle speed, loosen locknut on adjusting screw towards rear of engine. Turning adjustment screw clockwise will increase speed. If proper speed cannot be obtained with the adjustment screws, it may require loosing the locknut on air cylinder shaft and adjusting clevis. By turning clevis onto shaft speed will increase, by turning clevis out, speed will decrease. After proper speed is set, tighten all locknuts.

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P/N: 307271

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Contents Serial Number Model Number 06/17/2008 MCM Omega ToolPage Table of Contents Page OWNER’S Responsibility IntroductionAIR Compressor Safety Precautions Tampering with Noise Control System Prohibited User ModificationParking SafetyBefore Starting the Compressor Compressor USE and Compressed AIRLifting ServicingDescription IntroductionRotary Compressor Components Engine Components Enclosure ChassisInstrument Panel Door FrameEmergency Shutdown Procedure Starting ProcedureRoutine Shutdown Procedure OperationEngine Fuel Specifications MaintenanceCold Weather Fuel 15 P/NOIL Filter Replacement Engine Cooling SpecificationsEngine OIL and Filter MixturesRadiator Radiator Pressure CAPCompressor OIL Coolant LevelCompressor OIL Specifications 19 P/N Compressor OIL FilterCompressor & Engine AIR Filter Maintenance Element ReplacementElement Inspection Cleaning Oilthermostat Belts & Belt AdjustmentSeparator Element Replacement Compressor OIL Thermostatic ValveCONTROLS-OPERATION and Adjustments AdjustmentIdle Speed Adjustment Procedures Pressure Regulator Adjustment BatteryRated Speed Adjustment InstrumentsDaily Operation Maintenance Schedule25 P/N Maintenance Schedule ChartCompressor AIR Filter Element Procedure for Ordering PartsTroubleshooting Troubleshooting27 P/N Symptom Cause Remedy Troubleshooting Chart29 P/N Clean or replace the element Warranty Boss INDUSTRIES, INC Genesis Drive LAPORTE,31 P/N Summary of Main Warranty Provisions Warranty Claims Preparation of Part Return WARRANTY/RETURN Goods InstructionsReturn or Warranty Claims Filing Procedures 33 P/NDamage in Transit General35 P/N Screw Compressor AIR-END Exchange ProgramPage 37 P/N Section Assembly DrawingsEngine & PARTS, Omega 185-210 DUS Frame & PARTS, Omega 185-210 DUSCompressor & PARTS, Omega 185-210 DUS Coolers & PARTS, Omega 185-210 DUSREV Description Date ENG Revision History 39 P/NSWITCH, Press 18# N.O /8MNPT BRACKET,ASSY ENG. AIR CleanerSWITCH, Temp 220 F NC Gold Contacts SENDER, Coolant Temperature 3/841 P/N 307271 CONNECTOR, Male 1/4 T X 1/4 D CONNECTOR, 1 Mjic X 1 MnptCONNECTOR, 1/4 Mnpt X 1/4 Tube 200PSI DEG RELIEF, 1/2 NPT 175 PSIBOLT, Battery Hold Down BRACKET, Battery Hold DownBATTERY, 12VOLT 650CCA a VALVE, Service 1 X 3/4-Y VentedLA PORTE, 45 P/NPANEL, DUS OIL Fill Access PANEL, DUS Rear AccessLatch ADJ Lever C2-33-35 WASHER, Flat Wide 1/4 SS47 P/N John Deere 4045 DF Engine
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