10.0 MAINTENANCE
Blower motor Re−Grease
(N75−160 Aircooled units) 6 Months or 4000 Hrs
Apply high melting point grease into the blower motor drive end bearing using a grease gun at the nipple provided.
Stop when excess grease is seen at the relief port.
Main motor Re−Grease instructions
HPM 250L motor
Apply Exxon Polyrex - EM or Mobilith - CHC 220 grease into main motor drive end and
Drive end and
Stop when excess grease is seen at the relief port.
Coolant hoses
•The flexible hoses that carry coolant through the cooling system may become brittle with age and will require replacement. Have your local Ingersoll Rand Distributor or Air Center inspect them every 3 months and replace them as needed or every 2 years.
•Depending on the location of the hose, it may contain compressor coolant. It is recommended to drain the coolant into a clean container. Cover the container to prevent contamination. If the coolant is contaminated, a new charge of coolant must be used.
•Remove the hose.
• Install the new hose and refill the unit with coolant. Start the compressor, check for leaks and check coolant level. Refill as necessary
Pressure relief valve check
The pressure relief valve must be frequently tested and regularly maintained. Remove from the machine and check for the correct operating pressure. Adjust as necessary. If operating conditions are particularly severe, the frequency of testing and maintenance must be increased accordingly. A pressure relief valve check must also be performed at the end of any non−service period. The user must establish the frequency of such tests as it is influenced by such factors as the severity of the operating environment.
caution
High pressure air will discharge through the dis- charge ports of the valve during pressure relief valve check. Wear ample clothing, gloves, safety glasses and ear protection during valve testing.
Run the compressor for about 10 minutes by venting air from the system to let the unit warm up. With the unit running, test at or near the maximum operating pressure by opening the valve for the minimum period required to flush the valve seat free of debris. This can be accomplished by holding the test lever fully open or unscrewing the spring pressure retaining cap, depending on the type of valve installed. If there is no evidence of discharge or the valve does not fully close, discontinue use of equipment and contact a licensed contractor or qualified service personnel.
The pressure relief valve should also be tested and re−calibrated in accordance with any national or local codes that may exist. If no code exists, IR recommend that the pressure relief valve is recalibrated at intervals of one year.
Air filter change procedure
•Unclip the retaining cap and withdraw the old element.
•Fit the new element and refit the retaining cap.
Air filter change procedure N250/300H−2S
•Loosen wing nut on top of inlet filter housing. Lift cover up and away to expose elements.
•Carefully remove the old element to prevent dirt from entering the the compressor inlet.
•Thoroughly clean the element housing and wipe all surfaces
•Install new element and inspect to ensure that they have seated properly.
•Install top of inlet filter housing.
•Inspect the rubber seal on the retainer wing nut and replace seal if required.
•Tighten wing nuts.
Aircooled Cooler Cleaning
Ensure that the compressor is isolated from the compressed air system and is vented of all pressure. When undertaking any work on the compressor always use certified lifting equipment and employ sound working principles.
Ensure that the main power disconnect switch is locked off and tagged.
Visually check the outside of the cooler cores to be certain that a complete cleaning of the cooler is required. Frequently, dirt, dust or other foreign material may only need to be removed with a vacuum to remedy the problem.
When the cooler is covered with a combination of oil, grease or other heavy substances that may affect the unit’s cooling, then it is recommended that the cooler cores be thoroughly cleaned on the outside.
If it is determined that the compressor operating temperature is higher than normal due to the external passages between the fins of the cooler cores being restricted with deposits of foreign material, then the cooler should be removed for cleaning.
86IRN37 - 160K - CC & IRN50 - 200H
http://air.irco.com
