Air Filter Service Indicator - Toro Groundsmaster 5900 Series Service Manual

Air Filter Service Indicator

Testing
Electrical System: Component Testing
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1. Air filter
The air filter service indicator is a normally open (N.O.) vacuum actuated switch
attached to the air filter body
when the engine is running and the air filter elements become restricted, closing
the switch.
The air filter service indicator and its circuit wiring can be tested as a TEC
input using the InfoCenter Display (see
testing determines that the switch and circuit wiring are not functioning correctly,
proceed with the following test procedure:
1. Make sure key switch is OFF. Remove key from key switch.
2. Disconnect the service indicator from the wiring harness and remove
(unscrew) service indicator from air cleaner assembly.
3. Check the continuity of the service indicator by connecting a multimeter
(ohms setting) across the indicator terminals.
4. There should be no continuity (infinite resistance) between the service
indicator terminals.
5. Connect a hand operated vacuum pump to the switch fitting and apply 25 in.
Hg (−84 bar) of vacuum to close the switch. There should be continuity (zero
resistance) between the service indicator terminals.
6. If testing determines that service indicator is faulty, replace the indicator.
7. Install the service indicator and connect the indicator to the machine wiring
harness (see Air Filter (page
8. If the service indicator tests correctly and a circuit problem still exists, check
the wire harness (see
1
2
Figure 251
2. Air filter service indicator
(Figure 251). A high vacuum condition occurs
InfoCenter Display (page
4–11)).
Appendix A (page A–1)).
Page 6–108
6–9)). If
Groundsmaster ® 5900 & 5910
16227SL Rev B