Toro TX525 - How It Works; Testing; ELECTRICAL Cont.; Oil Pressure Switch

ELECTRICAL
5-10 Rev. 000 TX525 Service Manual
Oil Pressure Switch
How It Works
How It Works
Purpose
Location
Testing
Testing
When the water temperature reaches an excessive
operating temperature the switch closes and connects
the high temperature audible alarm and indicator light
to ground. The alarm sounds and the indicator light
illuminates.
The oil pressure switch is located on the left side of the
engine under the alternator (Fig. 0815).
Fig 0815 PICT-5312
When the engine oil pressure builds the oil switch
opens which removes the ground to the oil light and the
indicator light goes out.
Oil Pressure (Factory Specications)
• Idle speed  7 psi
• Rated speed  2864 psi
• Allowable  21 psi
The oil pressure switch indicates low oil pressure and
activates the oil light on the dash and the audible alarm.
It is not practical to test the water temperature switch in
a shop environment. Ground the lead connected to the
swtich to ensure the alarm sounds and the indicator light
illuminates.
The switch can be tested with an ohmmeter. There
should be continuity between the wire terminal and
ground with the engine not running. (There should be no
continuity between the wire terminal and ground when
the engine is running.)