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TM5-4210-229-14&P
5-7.
RESCUE SAW REPAIR (Continued).
(45)
Remove fuel tank and disassemble by
removing fuel cap (156), O-ring (157), filter
(158), vent kit (159), strainer (160), hose
(161), nipple (162), sleeve (163), and fuel
hose (164) from tank (165).
(46) Remove screws (150 and 166) and separate
right
and
left
hand
crankcase
halves.
Remove crankshaft (167), bearing (168) and
gasket (169).
(47)
Remove cylinder pin (170) and bearing (171)
from right hand crankcase half (172) and seal
(173) nut (174), and bearing (171) from left
hand crankcase half (175).
b.
Rescue Saw Carburetor Disassembly.
(1)
Remove four screws (176) and remove
diaphragm cover (177) with diaphragm (178)
and gasket (179).
(2)
Remove screw (180), [ever (181), lever
spindle (182) and spring (183).
(3)
Remove inlet needle valve (184), washer
(185), and the valve (186).
(4)
Remove governor (187) and seal (188).
(5)
Remove four screws (189), fuel pump cover
(190), gasket (191), pump diaphragm (192)
and strainer (193).
(6)
Remove nipple (194), idle screw (195) with
nylon ball (196), high speed adjust screw
(197) with spring (198) and low speed adjust
screw (199) with spring (200).
(7)
Remove screw (201) and throttle flap (202).
Remove lockring (203), washer (204) and seal
(205). Slide throttle shaft out and remove
seal (206), two bushings (207), and spring
(208) from shaft (209).
(8)
Remove screw (210), choke flap (211), choke
shaft (212), and spring (213) with ball (214).
INSPECTION
a.
Rescue Saw, Ignition Inspection
(1)
Remove cable (88) from spark plug (147).
Hold wire by insulation with terminal end
about 1/8 inch from metal body of spark plug.
(2)
Crank engine. If a bright hot spark jumps
gap, magneto is operating correctly.
(3)
Remove spark plug (147) and reconnect cable
(88).
(4)
Ground plug into cylinder body and crank
engine. If hot spark jumps the spark gap, the
ignition system is operating satisfactorily.
b.
Rescue Saw Spark Plug Inspection.
(1)
Remove spark plug (147). Check for any
cracks in porcelain and for points that are
pitted or burned.
(2)
Check point gap with a wire feeler gauge.
c.
Rescue Saw Magneto Inspection.
(1)
Inspect transistor coil (89) for cracked or
burned insulation. Make sure lead wires are
intact, especially where they enter the coil.
Inspect for open circuits, shorts, and grounds.
Inspect armature plate (93) for cracks, breaks
or excessive wear.
(2)
Inspect electronic ignition (133) for damaged
lead or dents or gouges in case.
NOTE
Move blade to within 1 inch of magnet. The
blade should be pulled against magnet if
magnet is properly charged.
(3)
Check flywheel magnets by holding a screw
driver on extreme end of handle with blade
down.
(4)
Test magneto by actual engine operation.
d.
Rescue Saw Crankshaft and Piston Inspection.
Never attempt to straighten a bent crankshaft.
5-14
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