Cutting Head - Husqvarna 371K Workshop Manual Supplement

For Husqvarna Parts Call 606-678-9623 or 606-561-4983

CUTTING HEAD

Belt drive
As with most other Husqvarna power cutters, the cutting disc on the 371K/3120K Air
Injection is driven by a drive belt running between the pulley on the crankcase and
the pulley on the drive shaft. As well as being simple, this type of transmission is
also lightweight.
This design also has a safety feature. If the cutting disc stops suddenly the drive
belt will slip and allow the engine to slow down more gently.
Sealed transmission cover
Large machines, such as the 371K and 3120K Air Injection, are frequently used for
wet-cutting. If water gets on the belt it acts as a lubricant and can lead to slipping.
These machines are therefore fitted with a sealed cover that prevents water from
reaching the belt. It also prevents dust from reaching the belt, which reduces wear.
In order to provide cooling for the transmission there are cooling vents in the cover
near the clutch (3120K).
Semi-automatic belt tensioning
There are almost as many different ideas about what is the correct belt tension as
there are power cutter operators. Husqvarna's semi-automatic belt tensioning
system is designed to solve this problem. A standard spring ensures the correct
tensioning force.
Under controlled laboratory conditions Husqvarna has determined the ideal belt
tension to ensure maximum belt life and ensure the right torque before the belt slips
on the pulley.
However it is still necessary to adjust the belt tension occasionally to compensate
for belt wear and stretching. This involves just three quick steps.
Drive belt
The drive belt on a power cutter is subjected to harsh, uneven wear and sometimes
high transient loads. The drive belt is also bent round a relatively tight radius over
the pulleys, which places special demands on the belt. The original belts fitted to
Husqvarna power cutters may look like any other belt, but they have been specially
designed for this purpose. The belt tensioning force that is set by the tensioning
spring has been chosen to suit original Husqvarna belts.
www.mymowerparts.com
7
English –