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John deere sst15 spin steer lawn tractor service repair manual (tm1908)
1. TM1908 JULY 2004
JOHN DEERE
WORLDWIDE COMMERCIAL & CONSUMER
EQUIPMENT DIVISION
ïçðè
Ö«´§ îððì
Spin-Steer Lawn Tractor
SST15, SST16 and SST18
TECHNICAL MANUAL
North American Version
Litho in U.S.A.
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21. Û²¹·²» ó Þ®·¹¹ ¿²¼ ͬ®¿¬¬±² Ü·¿¹²±¬·½ ó îð
ENGINE - BRIGGS AND STRATTON DIAGNOSTICS
Engine Starts Hard
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(11) Is carburetor adjusted properly, clean? See
“Carburetor Adjustment” on page 28.
No - ß¼¶«¬ ±® ½´»¿²ò Í»» Ý¿®¾«®»¬±® ß¼¶«¬³»²¬Œ ±²
°¿¹» îèò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(12) Is magneto kill circuit grounded - shorted? See
“Ignition Circuit Operation” on page 142 In the
Electrical section.
Yes - λ°¿·® ¿ ²»»¼»¼ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(13) Does engine lack compression? See
“Compression Test” on page 30.
Yes - ݸ»½µ ª¿´ª»ô °·¬±² ¿²¼ ®·²¹ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(14) Do valve tappets need adjustment? See “Valve
Inspection and Repair” on page 47.
Yes - Í»» Ê¿´ª» ײ°»½¬·±² ¿²¼ λ°¿·®Œ ±² °¿¹» ìéò
No - Ù± ¬± ²»¨¬ ¬»°ò
(15) Are valves and/or valve seats burned or are
valve seats loose? See “Valve Inspection and
Repair” on page 47.
Yes - Í»» Ê¿´ª» ײ°»½¬·±² ¿²¼ λ°¿·®Œ ±² °¿¹» ìéò
No - Ù± ¬± ²»¨¬ ¬»°ò
(16) Has engine seized?
Yes - Í»» Û²¹·²» λ³±ª¿´ ¿²¼ ײ¬¿´´¿¬·±²Œ ±²
°¿¹» ìîò
No - Ù± ¬± ²»¨¬ ¬»°ò
(17) Is camshaft worn?
Yes - Í»» ®»°¿·® »½¬·±²ò
Symptom: Engine Cranks But Does Not Start
½ CAUTION: Avoid Injury! Do not rotate engine
with starting motor if the spark plugs are
removed. Gasoline spray from the open
cylinders may be ignited by ignition spark and
cause an explosion or fire.
IMPORTANT: Avoid damage! Perform a visual
inspection first to determine if battery cables are
tight and not corroded and if the battery is of
sufficient size to turn the engine over at minimum
cranking speed of 350 rpm.
Symptom: Engine Starts Hard
(1) Are battery cables loose or dirty?
Yes - Ì·¹¸¬»² ±® ½´»¿²ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(2) Is battery fully charged? See “Battery Voltage &
Specific Gravity Tests” on page 178 in the
Electrical section.
No - ݸ¿®¹» ¾¿¬¬»®§ò Í»» Þ¿¬¬»®§ ó ݸ¿®¹»Œ ±²
°¿¹» ïéç ·² ¬¸» Û´»½¬®·½¿´ »½¬·±²ò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(3) Is air cleaner dirty?
Yes - Ý´»¿² ±® ®»°´¿½»ò Í»» ß·® Ý´»¿²»® λ³±ª¿´
¿²¼ ײ¬¿´´¿¬·±²Œ ±² °¿¹» ííò
No - Ù± ¬± ²»¨¬ ¬»°ò
(4) Is fuel pump defective?
Yes - λ°´¿½»ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(5) Is ignition coil air gap adjusted properly? See
“Ignition Armature Air Gap Adjustment” on
page 32.
No - ß¼¶«¬ ¿ ²»»¼»¼ò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(6) Is carburetor adjusted properly, clean? See
“Carburetor Adjustment” on page 28.
No - ß¼¶«¬ ±® ½´»¿²ò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(7) Are spark plugs loose/dirty?
Yes - Ý´»¿² ±® ®»°´¿½» ¿²¼ ¬·¹¸¬»² ¬± °»½·º·½¿¬·±²ò
No - Ù± ¬± ²»¨¬ ¬»°ò
22. Û²¹·²» ó Þ®·¹¹ ¿²¼ ͬ®¿¬¬±² Ü·¿¹²±¬·½ ó îï
ENGINE - BRIGGS AND STRATTON DIAGNOSTICS
Engine won’t shut off
Loss of power
(8) Is fuel old or contaminated?
Yes - λ°´¿½»
No - Ù± ¬± ²»¨¬ ¬»°ò
(9) Does engine lack compression? See
“Compression Test” on page 30.
Yes - ݸ»½µ ª¿´ª»ô °·¬±² ¿²¼ ®·²¹ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(10) Do valve tappets need adjustment? See “Valve
Inspection and Repair” on page 47.
Yes - ß¼¶«¬ ¿ ²»»¼»¼ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(11) Are valves and/or valve seats burned or are
valve seats loose? See “Valve Inspection and
Repair” on page 47.
Yes - λ°¿·® ±® ®»°´¿½» ª¿´ª» ¿²¼ñ±® »¿¬ ¿
²»»¼»¼ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(12) Is cylinder head warped? See “Cylinder Head
Inspection and Repair” on page 46.
Yes - λ°´¿½»ò Í»» ݧ´·²¼»® Ø»¿¼ λ³±ª¿´ ¿²¼
ײ¬¿´´¿¬·±²Œ ±² °¿¹» ìì ¿²¼ Í»» ݧ´·²¼»® Ø»¿¼
ײ°»½¬·±² ¿²¼ λ°¿·®Œ ±² °¿¹» ìêò
No - Ù± ¬± ²»¨¬ ¬»°ò
(13) Is exhaust system restricted?
Yes - Ý´»¿® »¨¸¿«¬ §¬»³ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(14) Is camshaft worn?
Yes - λ°´¿½»ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(15) Is connecting rod broken? See “Connecting
Rod Inspection” on page 50.
Yes - Í»» 笱²ô η²¹ ú α¼ λ³±ª¿´ ¿²¼
ײ¬¿´´¿¬·±²Œ ±² °¿¹» ìèò
No - Ù± ¬± ²»¨¬ ¬»°ò
(16) Are cylinder bore or rings worn? See “Piston,
Rings & Rod Removal and Installation” on page 48
and See “Cylinder Bore Inspection” on page 52.
Yes - Í»» 笱²ô η²¹ ú α¼ λ³±ª¿´ ¿²¼
ײ¬¿´´¿¬·±²Œ ±² °¿¹» ìè ¿²¼ Í»» ݧ´·²¼»® Þ±®»
ײ°»½¬·±²Œ ±² °¿¹» ëîò
Symptom: Engine Starts Hard
Symptom: Engine won’t shut off
(1) Is magneto kill circuit grounded - shorted? See
“Ignition Circuit Operation” on page 142 in the
Electrical section.
Yes - λ°¿·® ¿ ²»»¼»¼ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(2) Is carburetor adjusted properly, clean? See
“Carburetor Adjustment” on page 28.
No - ß¼¶«¬ ±® ½´»¿² ½¿®¾«®»¬±®ò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(3) Is fuel shutoff solenoid defective? See “Fuel
Shutoff Solenoid Test” on page 29.
Yes - λ°´¿½»ò
Symptom: Loss of power
(1) Is air cleaner dirty?
Yes - Ý´»¿² ±® ®»°´¿½»ò Í»» ß·® Ý´»¿²»® λ³±ª¿´
¿²¼ ײ¬¿´´¿¬·±²Œ ±² °¿¹» ííò
No - Ù± ¬± ²»¨¬ ¬»°ò
(2) Are fuel filter/lines clogged?
Yes - λ°´¿½» ±® ½´»¿²
No - Ù± ¬± ²»¨¬ ¬»°ò
(3) Is fuel pump defective?
Yes - λ°´¿½»ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(4) Is ignition coil air gap adjusted properly? See
“Ignition Armature Air Gap Adjustment” on
page 32.
No - ß¼¶«¬ ¿ ²»»¼»¼ò
Yes - Ù± ¬± ²»¨¬ ¬»°ò
(5) Are spark plugs loose/dirty?
Yes - Ý´»¿² ±® ®»°´¿½» ¿²¼ ¬·¹¸¬»² ¬± °»½·º·½¿¬·±²ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(6) Is fuel old or contaminated?
Yes - λ°´¿½» º«»´ò
No - Ù± ¬± ²»¨¬ ¬»°ò
(7) Is fuel shutoff solenoid defective? See “Fuel
Shutoff Solenoid Test” on page 29.