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TROUBLESHOOTING & REPAIR
F-31 F-31
RANGER 305D
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.6 – SOLENOID
Frequency Counter Method
NOTE: A dedicated frequency counter can be
used for this test, but many high quality digital
multimeters also have this function, and can be
easily utilized. See the manufacturer instruc-
tions for your frequency counter or multimeter.
1. Set your frequency counter per the meter
manufacturer instructions, and plug it into
one of the 120VAC auxiliary receptacles.
2. Start the engine and place the idle switch in
the “HIGH IDLE” position. Make sure that
there is no load on the machine.
The frequency should read between 60.5
and 61.5 Hz.
3. 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.
The frequency should read between 40 and
42 Hz.
If either of the readings is incorrect, pro-
ceed to the “THROTTLE ADJUSTMENT
PROCEDURE” later in this section.
NOTE: For the Ranger 305D, and any other
Lincoln Electric 3600 RPM (2 Pole) machine,
engine RPM can be determined by multiplying
the frequency, in Hz. By 60. (Example: 60 Hz *
60 - 3600RPM)
Low Idle
Jam Nuts
Swivel
Fitting
Solenoid
Rubber
Boot
High Idle
Screw &
Jam Nut
Engine Speed
Control Lever
Engine
Solenoid & Fuel
Pump Bracket
Electric Fuel Pump
(codes 10926 &11121 only)
INCREASE
(RPM)
DECREASE
(RPM)
MOVING ENGINE
SPEED CONTROL
LEVER
• Solenoid viewed from above and shown in High Idle position •