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TROUBLESHOOTING & REPAIR
F-30 F-30
RANGER 305D
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.5– STROBE MARK LOCATION
STROBETACHMARKFAN HUBENGINE SPEEDCONTROL LEVER
TEST PROCEDURE
Strobe-TachMethod
1. Turn the engine off
2. open the top and right side engine service
access doors.
3. Place a highly visible mark on the engine
cooling fan hub. See Figure F.5.
4. Connect the strobe-tach according to the
manufacturerʼs instructions.
5. Start the engine and place the idle switch in
the “HIGH IDLE” position. Make sure that
there is no load on the machine.
6. Direct the strobe-tach light on the fan hub
that had been marked earlier, and synchro-
nize the light with the rotating mark. Seethe
strobe-tach manufacturer instructions.
The tach should read between 3625 and
3675 RPM.
7. Move the idle switch to the “AUTO IDLE”
position and wait for the idle solenoid to
energize, and the engine RPM to drop and
stabilize at the low idle RPM.
8. Synchronize the strobe-tach to read the low
idle RPM.
If either of the readings is incorrect, proceed
to the “THROTTLE ADJUSTMENT PROCE-
DURE” later in this section.