[1] – Park machine safely.
[2] – Remove side panels.
[3] –
→NOTE:
Indicator does not function correctly when plastic indicator housing is damaged.
Locate and check air filter restriction indicator (A).
a. If window (B) is clear or yellow, no air cleaner service is required.
b. If window (B) shows fully red, air cleaner requires immediate service.
[4] –
→NOTE:
The air filter restriction indicator operation can be checked by unscrewing indicator from air filter outlet tube and sucking on the indicator′s vacuum port with your mouth. The indicator window (B) should show easy movement of indicator moving into the red zone and hold there until the release button (C), on top of indicator, is depressed.
Service air cleaner elements if needed.
[5] – Push reset button on top of air filter restriction indicator
Results:
Momentarily run engine at full throttle. If red indicator still moves and into the window after resetting button:
– Replace primary (large) filter element.
– Reset air filter restriction indicator button, and retest. If red indicator is still visible after retest:
– Replace secondary (small) filter element.
– Reset air filter restriction indicator button, and retest. If red indicator is still visible after retest:
– Check air filter housing, outlet and inlet tubes, unloader valve diaphragm.
– Run with both filter elements removed and recheck.
Procedure (Simulated Excess Restriction):
1. Make sure that park brake is ON. Start and run engine at SLOW idle.
2. Cover the air cleaner intake tube (A) with a piece of cardboard.
3. Watch air filter restriction indicator (B). The indicator should move into the red area.
4. Remove cardboard and stop engine.
5. Push indicator reset button, indicator should clear.
Results:
If restriction indicator DID NOT move, or moved little, check for:
– Loose or damaged hose clamps.
– Air leaks in air filter to intake manifold hose.
– Air leaks in intake manifold.
– Air leaks at indicator mounting threads.
– Cracked indicator housing or diaphragm.
– Clogged screen inside indicator mounting nipple.