Troy-Bilt 070 Manuel D’Utilisation

Engine fails to start

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.  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.

Engine runs erratic

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.  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.

Engine overheats

1.  Fill crankcase with proper oil.
2.  Refer to engine manual.
3.  See authorized service dealer.

1.  Engine oil level low.
2.  Dirty air cleaner.
3.  Carburetor not adjusted properly.

Occasional skips 

(hesitates) at 

high speed

1.  Adjust gap to .030”.
2.  See authorized service dealer.

1.  Spark plug gap too close.
2.  Carburetor idle mixture adjustment 

improperly set.

Unit does not 

discharge

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.  Discharge area clogged.

2.  Foreign object lodged in impeller.

3.  Low engine RPM.
4.  Vacuum bag is full.

Rate of discharge 

slows considerably 

or composition of 

discharged material 

changes

1.  Always run engine at full throttle.
2.  Replace chipper blade or see your 

authorized service dealer.

1.  Low engine RPM.
2.  Chipper blade dull.

Excessive Vibration

1.  Loose parts or damaged impeller.

1.  See authorized service dealer.

Unit fails to propel itself 

or slips when drive 

control is engaged

1.  Follow adjustment procedure 

in Servicing Your Yard Vacuum 
section of manual.

2.  See authorized service dealer.

1.  Drive control cable out of adjustment.

2.  Drive belt worn or damaged.