How It Works; Testing; Oil Pressure Switch; Purpose - Toro TX525 Service Manual

ELECTRICAL

How It Works

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.

Testing

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.

Oil Pressure Switch

Purpose

The oil pressure switch indicates low oil pressure and
activates the oil light on the dash and the audible alarm.
5-10

Location

The oil pressure switch is located on the left side of the
engine under the alternator (Fig. 0815).
Oil Pressure (Factory Specifications)
• Idle speed ­ 7 psi
• Rated speed ­ 28­64 psi
• Allowable ­ 21 psi

How It Works

When the engine oil pressure builds the oil switch
opens which removes the ground to the oil light and the
indicator light goes out.

Testing

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.)
Rev. 000
Fig 0815 PICT-5312
TX525 Service Manual