Troubleshooting - Troy-Bilt 70 Operator's Manual

6
Trouble
Shooting
For repairs beyond
the minor adjustments
listed here, contact
an authorized service
dealer.
Problem
Engine fails to start
Engine runs erratic
Engine overheats
Occasional skips
(hesitates) at
high speed
Excessive Vibration
Unit does not
discharge
Rate of discharge
slows considerably
or composition of
discharged material
changes
Unit fails to propel itself
or slips when drive
control is engaged
Cause
1. Throttle lever not in correct starting
position.
2. Spark plug wire disconnected.
3. Choke not in CHOKE position (if
equipped).
4. Fuel tank empty or stale fuel.
5. Engine not primed (if equipped).
6. Faulty spark plug.
7. Safety switch not depressed.
8. Safety switch wire is not connected to
engine or not properly grounded.
1. Spark plug wire loose.
2. Unit running on CHOKE (if equipped).
3. Blocked fuel line or stale fuel.
4. Low engine RPM.
5. Water or dirt in fuel system.
6. Dirty air cleaner.
7. Carburetor out of adjustment.
1. Engine oil level low.
2. Dirty air cleaner.
3. Carburetor not adjusted properly.
1. Spark plug gap too close.
2. Carburetor idle mixture adjustment
improperly set.
1. Loose parts or damaged impeller.
1. Discharge area clogged.
2. Foreign object lodged in impeller.
3. Low engine RPM.
4. Vacuum bag is full.
1. Low engine RPM.
2. Chipper blade dull.
1. Drive control cable out of adjustment.
2. Drive belt worn or damaged.
18
Remedy
1. Move throttle lever to FAST or
START position.
2. Connect wire to spark plug.
3. Move choke lever to CHOKE
position.
4. Fill tank with clean, fresh gasoline.
5. Prime engine as instructed in
Engine Manual.
6. Clean, adjust gap, or replace.
7. Safety switch must be depressed
by the front tab on the bag handle
when securing the bag.
8. Connect safety switch wire to
engine connector and ground to
mounting bracket.
1. Connect and tighten spark
plug wire.
2. Move choke lever to OFF position.
3. Clean fuel line; fill tank with clean,
fresh gasoline.
4. Always run engine at full throttle.
5. Drain fuel tank. Refill with
fresh fuel.
6. Refer to engine manual.
7. See authorized service dealer.
1. Fill crankcase with proper oil.
2. Refer to engine manual.
3. See authorized service dealer.
1. Adjust gap to .030".
2. See authorized service dealer.
1. See authorized service dealer.
1. Stop engine immediately and
disconnect spark plug wire. Clean
flail screen and inside of discharge
opening.
2. Stop engine and disconnect spark
plug wire. Remove lodged object.
3. Always run engine at full throttle.
4. Empty bag.
1. Always run engine at full throttle.
2. Replace chipper blade or see your
authorized service dealer.
1. Follow adjustment procedure
in Servicing Your Yard Vacuum
section of manual.
2. See authorized service dealer.