WASHER 1391402 - Caterpillar

Illustration 1 g00287035
Pressure Regulating Valve (1) Adjustment screw. (2) Regulator inlet. (3) Regulator outlet.Check and adjust the pressure regulating valve by using the following procedure:
Drain the line to the pressure regulating valve or drain the air storage tank.
Disconnect the regulator from the starter control valve.
Connect an 8T-0849 Pressure Gauge Group to regulator outlet (3) .
Put air pressure in the line or the tank.
Check the pressure.
Adjust the pressure regulating valve to the value that is shown for the Recommended Air Pressure Setting.
Remove the air pressure from the line or the tank.
Remove the 8T-0849 Pressure Gauge Group and connect the air pressure regulator to the line to the air starting motor.Each engine application must be inspected in order to determine the most advantageous starting conditions. The settings for the pressure regulating valve are affected by the following factors:
Loads from attachments that are pulled by the engine during the start-up
Ambient temperature conditions
Oil viscosity
Capacity of air reservoir
Condition of the engineThe Recommended Air Pressure Setting for the air starting motor is the following values.Minimum ... 1034 kPa (150 psi)Maximum ... 1723 kPa (250 psi)The advantage of setting the valve at the higher pressures is the increased torque for the starting motor and the faster rotation of the engine. The advantage of setting the valve at the lower pressures is the longer time of the engine rotation for the given reservoir capacity of the supply air.