Figure 4-7. Oil Pressure Regulator

4-14.3. COMPRESSOR IMPELLER/GROOVE PULLEY

TM-5-4310-393-14 Air Compressor Diesel Engine Driven 20 CFM 3200 PSI Model KA7-DA Manual
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TM 5-4310-393-14 a port at the base of the second stage cylinder. A sight glass is provided at the return port When oil pressure is properly regulated, full oil flow is visible without bubbles. Adjustment of the lube oil pressure regulator is described in paragraph 3-14.1. A plug in the top of the mounting flange provides a connection for a pressure gauge to check oil system pressure Normal operating oil pressure is 850 psi ± 50 psi If proper oil pressure cannot be maintained by the regulator, the unit must be replaced. C. Replace. 1. Replacing the Oil Pressure Regulator. CAUTION The regulator is internally spring loaded. Remove and disassemble with care. a. Remove inlet and return oil lines ( Figure 4-7, Items 2 and 3). Cap or plug open ends to prevent contamination of the oil system b. Remove mounting socket head cap screws (1) and remove the regulator (4) and O-ring (8). c. Install O-ring with halo carbon grease into piston cylinder d. Install the regulator by attaching it to the third stage cylinder with the socket head cap screws as original. e. Reinstall the oil lines from the oil pump and from the second stage cylinder Figure 4-7. Oil Pressure Regulator NOTE Before the compressor is placed in service it will be necessary to check oil pressure with a suitable pressure gauge. f. Remove the plug (7) from the gauge port, fitting (6) in the top of flange (5). g. Install a calibrated test pressure gauge, suitable for testing oil pressure in the range of 700 to 1000 psi (48.9 to 69 bar) The connector (6) is for 6mm L tube. h. With the compressor in operation, verify that oil pressure is normal and the regulator is properly adjusted in accordance with paragraph 3-14.1. 2. Oil Lines a. The oil lines provided with the model CAPITANO-PD are available as assemblies. In case of damage they should be replaced as assemblies The oil lines consist of a supply line between the oil pump and the oil pressure regulator, and a return line from the oil pressure regulator to the second stage cylinder. Each is fabricated of 6 mm OD tube, shaped to fit the configuration of the compressor. The supply line includes a filter which is an integral part of the line. 4-17

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