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SERVICE MANUAL
McCULLOCH
10
13
23
Fig. MC131—Exploded view of saw components
typical of alt modeta.
1. Starter housing
2. Rewind spring
3. Rope handle
4. Rope pulley
5. Fuel primer bulb
6. Front handle
7. Fuel tank
8. Heat shield
9. Fuel hose & screen
10. Air filter cover
11. Foam filter
12. Powerhead
13. Chain brake assy.
14. Engine housing
15. Throttle latch
16. Throttle rod
17. Return spring
18. Throttle trigger
19. Choke rod
20. Oil Unk
21. Oil pickup hose & screen
22. Stop switch contacts
23. Stop switch button
24. Fan hotising
24
chain brake operation, place saw on flat
surface and run at wide-open throttle.
Activate chain hand guard and chain
should stop moving immediately. Pull
hand guard rearward to disengage
brake. No adjustment of chain brake is
required. If brake fails to operate prop-
erly, disassemble and inspect for prob-
lem.
Tb disassemble chain brake, unbolt
and remove brake housing (8—Fig.
MC133) from saw. Engage the brake to
relieve spring tension. Remove brake
actuating lever (5) and carefully disen-
gage spring (6). Remove brake band (9)
from housing.
Inspect all components for evidence
of wear or damage and renew as neces-
sary. Brake band should be renewed if
any point is worn to a thickness of 0.020
inch (0.5 mm) or less.
When reassembling, lubricate pivot
points and latch engaging surface with
light coat of multipurpose grease.
REWIND STARTER, Tb disassem-
ble rewind starter, remove starter
housing (2—Fig. MC134) from fan
housing. Remove rope handle (1) and
allow rope and pulley to slowly rewind.
Remove pulley retaining screw (5) and
withdraw rope pulley (4). Care should
be taken when removing rewind spring
(3) not to allow spring to unwind uncon-
trolled.
Inspect starter pawls (16—Fig.
MC132) and springs (17) for wear or
damage and renew as necessary.
Rewind spring is contained in a case
(3—Fig. MC134). If spring becomes dis-
engaged from the case, it should be
wound into the case in a clockwise di-
rection from outer end. Starter rope
length is 50 inches (127 cm). Wind rope
on pulley in clockwise direction viewed
from flywheel side.
TD pre-tension rewind spring, com-
plete starter assembly and pass rope
through housing outlet. Install rope
handle, then pull a loop of rope back
through the outlet and engage rope in
notch of rope pulley. Rotate pulley one
tum clockwise with rope in notch. Re-
lease rope from notch in pulley. Rope
should be held snugly against the
starter housing.
Pull rope handle and check rewind
operation. With starter rope fully ex-
tended, it should be possible to turn
pulley at least an additional 1/2 tum
clockwise. Be sure excessive tension is
not placed on rewind spring, otherwise
spring may break when rope is pulled
to its fiill length. Repeat spring pre-
tension procedure until desired rewind
action is obtained.
Dlustrations county McCuUoch Corp.
393
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