Fuel Tank; Piston And Cylinder - Husqvarna 455 Rancher Workshop Manual
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Also See for 455 Rancher:
- Operator's manual (148 pages) ,
- Workshop manual (40 pages) ,
- Operator's manual (92 pages)
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Repair instructions
Fuel tank vent
The two-way valve has the following properties:
• Has a controlled opening pressure outwards and
inwards that prevents overpressure and under-
pressure arising in the fuel tank, which can affect
the engine. This also impedes fuel leakage.
• Opening pressure outwards 100-450 mbar.
• Opening pressure inwards (vacuum) max.
70 mbar.
Testing
Opening pressure outwards:
1. Open the fuel cap and let the fuel cap remain
off during the entire check. Empty the fuel from
the tank.
2. Connect the pump, part no. 531 03 06-23 to
the tank valve.
3. Switch the pump to vacuum mode.
4. Pump 3 times.
5. The indicator should stop in between
10-45 kPa after pumping.
Opening pressure inwards:
1. Open the fuel cap and let the fuel cap remain
off during the entire check. Empty the fuel from
the tank.
2. Connect the pump, part no. 531 03 06-23 to
the tank valve.
3. Switch the pump to pressure mode.
4. Pump 3 times.
5. The indicator should stop on max 7 kPa
after pumping.
34
– English
Tank vent replacement
Pull out the tank vent with a pair of knurled fl at
pliers.
Gently push the new tank vent into place using a
suitable sleeve.
Piston and cylinder – removal
1
Remove:
• cylinder cover
• carburettor (see "Carburettor – removal")
• silencer
• spark plug
•
hand guard (2 screws)
2
Unbolt the vibration damping spring from the front
handle.
3
Undo the four cylinder bolts from the underside
and lift the cylinder off carefully.
4
Cover the opening in the crankcase.
5
Remove the circlips from the ends of the gudgeon
pin and press it out. Then lift off the piston.
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