Hayter Mowers Harrier 48 491G - Manual (Page 10)

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Friction Disc
The cutterblade is driven by the engine via a friction
disc to help prevent damage occurring to the engine
crankshaft and cutting mechanism when a hidden
obstruction or overload is encountered. (Refer fig.18)
Always stop the engine when a hidden obstruction
or excessive vibration is encountered. Disconnect the
spark plug lead and examine the cutting mechanism.
ALWAYS replace a damaged cutterblade - Refer to
“Maintenance”.
Non Grassed Areas
When moving the mower across non-grassed areas, stop
the engine and set the mower to the maximum height of
cut to protect the cutting mechanism. (Refer fig.19)
Maintenance Schedule
Follow the hourly or calendar intervals, whichever occurs
first. More frequent service will be required if working for
prolonged periods under dusty, dry conditions, or when
airborne debris is present or after extensive operation
cutting tall, dry grass.
First 5 Hours
- After the very first five hours change the engine oil
- Adjust the autodrive clutch cable
Daily
- Check the oil level
- Remove grass debris from around the engine, exhaust/
exhaust guard, air ways in the top cowl, underside of
the deck housing and from the grassbag and check for
signs of damage.
- Check the condition of guards and safety devices.
- Check condition of cutterblade.
25 Hours Or Every Season
- Change the engine oil if continuously operating under
heavy load or high ambient temperature.
- Service the air cleaner.
- Lubricate wheels, pivot points and linkages and grease
the inner control cables at point of entry and exit from
their outer casing.
- Check the clutch cable adjustment.
- Sharpen the cutterblade.
50 Hours Or Every Season
Change the engine oil.
100 Hours Or Every Season
- Clean the engine cooling system. Clean more often
under dusty conditions or when airborne debris is
present or after prolonged operation whilst cutting tall,
dry grass.
- Replace the spark plug.
Engine Detail (Refer fig.20)
Fig. 18
OPERATING THE MOWER / MAINTENANCE SCHEDULE
Fig. 19 Fig. 20
1. Air Cleaner
2. Fuel Cap
3. Start Grip
4. Cover
5. Oil fill/Dipstick
6. Exhaust Guard
7. Exhaust
8. Spark Plug / Lead
9. Carburettor 7
1
8
9
6
5
3
4
2