Spark Plug Service; Fuel Filter Service; Engine Adjustment - Lincoln Electric RANGER 250 SVM150-A Service Manual

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Air Filter Paper Element Service
1. Loosen the cover retaining knob and remove the
cover.
2. Remove the pre-cleaner from the paper element.
3. Remove the element cover nut, element cover, and
paper element.
4. Do not wash the paper element or use pressurized
air, as this will damage the element. Replace a
dirty, bent, or damaged element with a new ele-
ment. Handle new elements carefully; do not use
if the sealing surfaces are bent or damaged.
5. When servicing the air cleaner, check the air
cleaner base. Make sure it is secured and not bent
or damaged. Also check the element cover for
damaged or improper fit. Replace all damaged air
cleaner components.
NOTE: Before the air cleaner is reassembled, make
sure rubber seal is in position around the stud. Inspect,
making sure it is not damaged and seals with the ele-
ment cover.
6. Reinstall the paper element, pre-cleaner, element
cover, element cover nut, and air cleaner cover.
Secure the cover with the cover retaining knob.

SPARK PLUG SERVICE

To ensure proper engine operation, the spark plugs
must be properly gapped and free of deposits.
WARNING
The muffler becomes very hot during operation and
remains hot for a while after stopping the engine. Be
careful not to touch the muffler while it is hot.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a plug wrench to remove the spark plugs.
4. Visually inspect the spark plugs. Discard them if
the insulator is cracked or chipped. Clean the
spark plug with a wire brush if it is to be reused.
5. Measure the plug gap with a feeler gauge. Correct
as necessary by bending the side electrode.
6. Check that the spark plug washer is in good condi-
tion and thread the spark plug in by hand to pre-
vent cross-threading.
MAINTENANCE
7. After the spark plug is seated, tighten with a spark
plug wrench to compress the washer.
• If installing a new spark plug, tighten 1/2 turn after
the spark plug seats to compress the washer.
• If reinstalling a used spark plug, tighten 1/8 - 1/4
turn after the spark plug seats to compress the
washer.
Spark Plug Gap: .030 in. (0.76 mm)-Kohler
Spark Plug Torque: 20 ft. Lb. (27 N-m)-Kohler
The spark plug must be securely tightened. An improp-
erly tightened spark plug can become very hot and
may cause engine damage.
Use only the recommended spark plug or equivalent.
A spark plug which has an improper heat range may
cause engine damage.

FUEL FILTER SERVICE

1. Check the fuel filter for water accumulation or sed-
iment.
2. Replace the fuel filter if it is found with excessive
water accumulation or sediment.

ENGINE ADJUSTMENT

OVERSPEED IS HAZARDOUS.
The maximum allowable high idle speed for this
machine is 3750 RPM, no load. Do NOT tamper with
governor components or setting or make any other
adjustments to increase the maximum speed. Severe
personal injury and damage to the machine can result
if operated at speeds above maximum.
Adjustments to the engine are to be made only by a
Lincoln Service Center or an authorized Field Service
Shop.
RANGER 250
.025 in. (0.64 mm)-Onan
11 ft. Lb. (14 N-m)-Onan
CAUTION
WARNING
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