Hour Meter/Tachometer; Purpose; Location; How It Works - Toro 22317 Service Manual

4-PAW GAS/ELECTRICAL

Hour Meter/Tachometer

Purpose

The hour meter displays engine run time and is a service
reminder. When the engine is running, it also displays
the speed of the engine in revolutions per minute (rpm).
After 50 hours and then every 100 hours thereafter (that
is at 150, 250, 350, etc.) the screen displays CHG OIL
to remind you to change the oil. After every 100 hours,
the screen displays SVC to remind you to perform the
other maintenance procedures based on a 100, 200, or
400 hour schedule. These reminders come on starting
three hours prior to the service interval time and flash at
regular intervals for six hours.

Location

The hour meter is mounted below the ignition switch on
the upper frame assembly (Fig. 1218).
5/5-6
Fig. 1218 DSC-1372

How It Works

The digital inductive hour meter is an electronic clock
and RPM gauge. It is not repairable or resettable (Fig.
1219).

Testing

The hour meter uses inductive current flow from the
spark plug wire. Prior to replacing the hour meter, do a
continuity check on the wire that is wrapped around the
spark plug wire to the hour meter. If you have continuity,
replace the hour meter.
Toro Wheeled CUL Service Manual
Fig. 1219 IMG-0542a