TM 9-2320-209-34-2-1 d. Air Cylinder and Air Tube Cleaning, Inspection, and Repair. WARNING Dry cleaning solvent is flammable. Do not use near an open flame. Keep a fire extinguisher nearby when sol- vent is used. Use only in well-ventilated places. Fail- ure to do this may result in injury to personnel and damage to equipment. 1. Clean air cylinder (1) and end cover (2) with dry cleaning solvent. 2. Check that inside of air cylinder (1) and end cover (2) has no scratches or nicks. Small scratches can be rubbed out with crocus cloth. If any scratches cannot be rubbed out, throw away air hydraulic cylinder and get a new one. 3. Put a coat of preservative oil on air cylinder (1) and end cover (2). 4. Check that air tube (3) has no cracks, flattened areas or other damage. If air tube is damaged, throw it away and get a new one. END OF TASK 12-23