| Tools Needed | Quantity |
| 8T-0849 Pressure Gauge Group | 1 |
 | |
| Illustration 1 | g00692961 |
Section view of a typical pressure regulating valve (1) Adjustment screw (2) Regulator inlet (3) Regulator outlet | |
Use the following procedure to check and adjust the pressure regulating valve:
- 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 (3) .
- Apply air pressure to regulator inlet (2) 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 engine
The minimum recommended air pressure is 1034 kPa (150 psi).
The maximum allowable air pressure is 1551 kPa (225 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. Additionally, a lower air pressure reduces wear on the starting motor.