Maintenance, Grinding heads | Husqvarna PG680, PG820 instruction

Maintenance

Used correctly, the machine is an extremely low-main- tenance and reliable.

This section covers the general maintenance items that need attention on a periodic basis.

There are three main mechanical items to check:

1.Grinding Heads.

2.Planetary drive system.

3.Planetary seal.

Grinding heads

There are 2 different grinding head options:

11.Conventional / Demolition heads—designed for heavy duty preparation grinding where an extremely robust system is required.

2.Spring steel head system—designed more for ﬁnish- ing or lighter grinding applications.

CONVENTIONAL/DEMOLITION HEADS

The below diagram illustrates the main parts compris- ing this type of grinding head.

1.Head mate

2.Head plate

3.Head lock

4.Head spring

The interrelation between the above four components enables a dynamic system which is both robust and ﬂexible.

The head pins are ﬁxed to the head plate giving rigid- ity and stability. The head mate is situated above the head plate and is held in place by a series of holes

– head pin holes.

1.1.

	2.		2.
1.	Head mate	1.	Head plate
2.	Head pin hole	2.	Head pins

Between the head plate and head mate are 3 white silicone springs which give shock absorption and ﬂex- ibility in the system.

The head pins are able to move within the head pin holes, creating a shock absorber type system similar to that in most motor vehicles.

Over an extended period of time, the head pin holes wear open. Along with this, the head pins wear and reduce in diameter. This combined wearing of the two creates excessive movement or “slop” within the grind- ing heads. This “slop” will eventually cause vibration whilst the machine is operating.

Routine checks for slop in the grinding heads are recommended. Life expectancy for grinding heads can vary between 6 and 12 months depending on amount of usage.

Replacement heads are available and simply bolt into place when the old ones are removed

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