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F-31 TROUBLESHOOTING & REPAIRF-31
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.6 – SOLENOID
Electric Fuel Pump | Solenoid & Fuel | Engine |
Pump Bracket | ||
(codes 10926 &11121 only) |
| Engine Speed |
|
| |
|
| Control Lever |
High Idle |
|
| Low Idle | Swivel |
|
Screw & |
|
|
| ||
Jam Nut | Rubber | Solenoid | Jam Nuts | Fitting | MOVING ENGINE |
|
|
| SPEED CONTROL | ||
| Boot |
|
| LEVER | |
|
|
|
| INCREASE | DECREASE |
|
|
|
| (RPM) | (RPM) |
• Solenoid viewed from above and shown in High Idle position •
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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)
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