Craftsman 79960 - Safety Interlock

TROUBLESHOOTING POINTS
Before performing any of the corrections in this Troubleshooting Chart, refer to the appropriate information
contained in this Manual for the correct safety precautions and operating or maintenance procedures.
PROBLEM !
EngineDoesNot Start
EngineRunsPoorly
Engine Overheats
Chipper DoesNot Chip
ChippingPerformanceIs
Poor
POSSIBLE CAUSE
1 Spark plug wire disconnected
2, EngineControl Lever in OFFposition
3 Fueltank empty
4 Stale gasoline
5 Safety Interlock switch hasfailed
6 Collection bag or blower deflector not installed
7 Incorrect Control Lever setting
8, Dirty air filter
9, Defective or incorrectly gapped spark plug
t0 Carburetor out of adjustment
t Badsparkplug
2 IncorrectEngineControlLeversetting
3 Dirtyairfilter
4 Carburetoroutofadjustment
5 Stalegasoline
6, Dirtor waterinfueltank
7 Enginecoolingsystemclogged
1 Enginecooling system clogged
2 Carburetor out of adjustment
3 Oillevel is tow
t Solidobjectjammedin unit
2 Brokenor missingchipperblade
I LDull chipper blade
2, Enginenot reaching full RPM
3 Excessivelyworn engine shaft bearing(s)
4 Loose engine mounting bolts
5, Chipper bladeto anvil clearance incorrect
CORRECTION
1 Reconnectwire
2 Put EngineControl Lever in START(Page 20)
3 Add gasoline (Page 19)
4 Drain gasolineand add fresh gasoline
5 Contact SearsService Center
6 Install collection bag or blower deflector
7 Put Controt Lever in START(Page20)
8 Replacefilter (Page 28)
9 Inspect spark plug (Page28)
10 Contact SearsService Center
! Replacespark ptug (Page29)
2 Put Lever in correct setting (Page 20)
3, Replacefilter (Page 28)
4 Contact SearsServiceCenter
5 Drain gasoiine and add fresh gasoline
6 Contact SearsServiceCenter
7 Cleanair intake screen and cooling fins
(Page 28)
1
2
3
Cleanair intake screen and cooling fins
(Page 28)
Contact SearsService Center
Checkandaddoil(Page27)
1 Checkfor andremoveanyobstruction
(Page26)
2. Replaceblade(Page30)
1 Sharpenor replaceblade(Page30)
2 ContactSearsServiceCenter
3, ContactSearsServiceCenter
4 Tightenbolts(Page29)
5: ContactSearsServiceCenter(correct
clearanceis 030"-090")
33