LINES GP-FRONT 1158895 - Caterpillar

Required Tools
Table 1
Required Tools Qty
8T-0849 Pressure Gauge Group 1 Test Preparation
Illustration 1 g03781028
Section view of a typical pressure regulating valve
(1) Regulator outlet
(2) Adjustment screw
(3) Regulator inlet
Relieve the air pressure to the pressure regulating valve.
Disconnect the pressure regulating valve from the starting motor's control valve.
Connect an 8T-0849 Pressure Gauge Group to regulator outlet (1). Test Procedure
Apply air pressure to regulator inlet (3) and measure the pressure.
Adjust the pressure regulating valve to the value that is shown for the recommended air pressure setting.
Relieve the air pressure to the pressure regulating valve.
Remove the 8T-0849 Pressure Gauge Group. 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 minimum and the maximum operating pressure will depend on the type of starter. The recommended operating pressure is stamped on the identification tag for the starter.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. Additionally, a lower air pressure reduces wear on the starting motor.