Troubleshooting - Homelite UT33600 Operator's Manual

Problem
Engine will not start
Engine does not reach full
speed and emits excessive
smoke
Engine starts, runs, and
accelerates but will not idle
Line will not advance
Spool retainer hard to turn
Grass wraps around drive
shaft housing and string
head
Engine starts and runs but
string head does not turn

TROUbLESHOOTINg

Possible Cause
1. No spark.
2. No fuel.
3. Engine is flooded.
1. Incorrect lubricant/fuel mixture.
2. Air filter is dirty.
3. Spark arrestor screen is dirty.
4. Spark plug fouled.
1. Idle speed screw on carburetor
needs adjustment.
1. Line is welded to itself.
2. Not enough line on spool.
3. Line is worn too short.
4. Line is tangled on spool.
5. Engine speed is too slow.
1. Screw threads are dirty or
damaged.
1. Cutting tall grass at ground level.
2. Operating trimmer at part throttle.
1. Shafts are incorrectly assembled.
Page 14 — English
Solution
1. Clean or replace spark plug. Reset spark plug
gap. Refer to Spark Plug Replacement earlier
in this manual.
2. Push primer bulb until bulb is full of fuel. If bulb
does not fill, primary fuel delivery system is
blocked. Contact an authorized service dealer. If
primer bulb fills, engine may be flooded, proceed
to next item.
3. Set the CHOKE lever to the START position.
Squeeze the trigger and pull the rope repeatedly
until the engine starts and runs.
NOTE: Depending on the severity of the flooding,
this may require numerous pulls of the rope.
1. Use fresh fuel and the correct 2-cycle lubricant
mix. (50:1).
2. Clean air filter screen. Refer to Cleaning Air
Filter earlier in this manual.
3. Contact an authorized servicing dealer.
4. Clean or replace spark plug. Reset spark plug
gap. Refer to Spark Plug Replacement earlier
in this manual.
1. Turn idle speed screw clockwise to increase idle
speed. See Figure 15.
1. Lubricate line with silicone spray.
2. Install more line. Refer to the applicable line
replacement section in this manual.
3. Pull lines while alternately pressing down on and
releasing spool retainer.
4. Remove line from spool and rewind. Refer to
the applicable line replacement section in this
manual.
5. Advance line at full throttle.
1. Clean threads and lubricate with grease - if no
improvement, replace the spool retainer.
1. Cut tall grass from the top down to prevent
wrapping.
2. Operate trimmer at full throttle.
1. Reassemble shafts. Refer to Connecting the
Power Head Shaft and Trimmer Shaft in the
Assembly section of this manual.