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STROBE
TACH
MARK
FIGURE F.4 - STROBE MARK LOCATION
ENGINE THROTTLE ADJUSTMENT TEST (CONTINUED)
TEST PROCEDURE
Strobe-Tach Method
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 cool-
ing fan blade. See Figure F.4.
4. Connect the strobe-tach according to the man-
ufacturer’s 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 blade
that had been marked earlier, and synchronize
the light with the rotating mark. See the
strobe-tach manufacturer instructions.
The tach should read between 1860 and 1890
RPM.
7. Move the idle switch to the “AUTO IDLE” posi-
tion 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.
Low idle speed should be 1300-1400 RPM.
If either of the readings is incorrect, proceed to
the THROTTLE ADJUSTMENT PROCE-
DURE later in this section.
TROUBLESHOOTING & REPAIR
F-30 F-30
VANTAGE® 400
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