| |
| Illustration 1 | g06375370 |
|
Schematic representation of the hydraulic fan and brake pump, brake charging valve, and hydraulic fan. | |
The cold start bypass solenoid (1) is energized to shift the cold start valve spool to the open position. When the solenoid is energized, oil is allowed to short-cycle from the fan and brake pump outlet to the inlet. The result is a reduced load on the engine when starting. The solenoid is energized until the engine reaches low idle after cranking.
| |
| Illustration 2 | g06356741 |
|
Schematic representation of the hydraulic fan and brake pump, brake charging valve, and hydraulic fan. | |
Fan speed control solenoid (1) controls the position of the fan speed control valve spool. The solenoid is energized to shift the valve spool and cause oil to bypass the fan motor. Reduced oil flow to the motor results in lower fan speed. The fan speed control solenoid responds to engine temperature and hydraulic oil temperature, to maintain constant system temperatures.
Control Solenoid (Reversing Fan Attachment)
| |
| Illustration 3 | g06356746 |
|
Schematic representation of the reversing fan attachment. | |
The reversing fan solenoid (1) is energized to shift the control valve spool. When the control valve spool opens, pressurised oil enters the swashplate angle piston. The swashplate angle piston tilts the swashplate to control motor displacement and rotation direction.