Lincoln Electric RANGER 250 SVM150-A Service Manual page 116

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ENGINE/STATOR/ROTOR REMOVAL AND REPLACEMENT (continued)
6. Double check that the spark plug wires
are disconnected. You will be turning the
rotor during this procedure, and this could
cause engine kickback.
7. Hold the rotor shaft with locking pliers. With
the 5/8" wrench or an impact wrench,
remove the rotor thru-bolt. Hold the rotor
with one hand and shock the wrench with a
mallet to loosen the thru-bolt. The thru-bolt
has a centering washer, tapered to conform
to the rotor shaft.
8. Remove the thru-bolt and washer from the
end of the rotor.
9. Install the appropriate long thru-bolt (two
are provided) supplied with Lincoln Electric
Rotor Puller Kit S20788.
must face out. Screw in the bolt with the
slot head screw driver until the bolt bottoms
out on the engine crankshaft, about 3/4".
10. Turning it counterclockwise, screw in the
left-hand thread rotor removal tool from the
kit into the rotor shaft. Carefully prevent the
rotor from turning - use locking pliers.
Tighten the tool to approximately 50 ft lbs
with the torque or impact wrench. The rotor
should "pop" off the engine crankshaft.
11. If the rotor does not pop off, continue to
carefully prevent the rotor shaft from turning
and tighten the rotor removal tool an addi-
tional 5 ft lbs. until the rotor pops off the
engine crankshaft.
12. With the 7/16" wrench, remove the side fire-
walls.
13. With the 9/16" wrench, remove the four
bolts that hold the stator to the engine.
There is one lock washer per bolt.
14. Carefully remove the stator/rotor assembly
from the engine. Once the assembly is sep-
arated from the engine, be careful that the
rotor does not fall out of the stator.
TROUBLESHOOTING & REPAIR
The slot head
RANGER 250
15. Carefully remove the rotor from the stator.
You can tap carefully on the end of the rotor
shaft with a rubber mallet. Guide the rotor
carefully to prevent damage to its core.
REASSEMBLY NOTES
Reassemble the rotor and stator to the Ranger
250 by carefully retracing the disassembly proce-
dure steps in reverse order. Keep the following
special points in mind as you proceed. A Lead
Reconnection Checklist is provided here to aid in
reassembly.
Rotor/Stator/Engine Reassembly
Refer to Figure F.30.
NOTE: Lincoln Electric recommends that you
install a new bearing (Lincoln part #M9300-85)
and tolerance ring (Lincoln part #S18044-9) any
time the stator and rotor are reassembled.
1. Fit the rotor into the stator, being careful not
to damage the rotor core against the stator.
Position the rotor so that the laminations are
at top and bottom and air gap at the sides.
This will limit movement of the rotor.
IMPROPER HANDLING OF THE ROTOR
CAN RESULT IN SHORTED WINDINGS
AND/OR LOST OUTPUT.
2. Tap the rotor carefully with a mallet to fit the
bearing all the way into the stator frame.
3. Clean the tapered engine crankshaft.
4. Using the hoist, carefully fit the stator/rotor
assembly onto the engine crankshaft.
5. Install the four bolts that mount the stator to
the engine. NOTE: Apply Loctite 271 thread
sealant to the two bottom bolts on the
ONAN engine, to prevent oil leakage from
the crankcase. With the 9/16" wrench, draw
the bolts up evenly in order to seat the rotor
bearing properly. Tighten moving diagonal-
ly from bolt to bolt.
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