HT 105, HT 134, HT 135
English
32
Maintenance and Care
The following intervals apply for normal operating conditions. The specified intervals 
must be shortened accordingly when working for longer than normal or under difficult 
cutting conditions (extensive dust, etc.).
Before starting work
At the end of work and/or 
daily
Whenever tank is refilled
Weekly
Monthly
Annually
If faulty
If damaged
As required
Complete machine
Visual inspection (condition, leaks) XX
Clean X
Control handle Function test XX
Air filter
Clean XX
Replace
2)
X
Manual fuel pump (if present)
check X
Have repaired by a specialist dealer
1)
X
Fuel pickup body in fuel tank
Have checked by dealer
1)
X
Have replaced by servicing dealer
1)
XXX
Fuel tank Clean XX
Carburetor
Check idle adjustment – chain must not 
rotate
XX
Adjust idle speed X
Spark plug
Adjust electrode gap X
Replace after every 100 hours of 
operation
Cooling air intakes
Visual inspection X
Clean X
Valve clearance
1)
If power is low or cranking effort very 
high, have valve clearance checked 
and, if necessary, adjusted by dealer
1)
X
Spark arresting screen in muffler
Check if installed X
Check or replace
1)
X
All accessible screws, nuts and bolts (not 
adjusting screws)
Tighten X