Husqvarna oil guard system

[mikecotterill]

Ok so it's not really arb related but we have a husky disc cutter at work, tried it today, it started revved up for a few seconds then would only idle. So borrowed one from another yard, worked fine till we filled it up again, then the same thing, so obviously the fuel seemed to be an issue. So I googled the oil guard couldn't get much info except, your supposed to use husky two stroke or if you use any other you had to deactivate the system, couldn't find out how, until we figured out you had to pull a little plug out. So the questions is (finally!) anyone know how it works exactly, how does it know what oil is used? Also presumably there's a bit of a computer in it to stop the engine revving up??

 

 

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[Daniël Bos]

It works by using an optical sensor that detects the correct colour. The correct oil has a particular dye to accomplish just the right colour.

 

The next bit I borrowed from elsewhere on the interweb.

 

 

 

 

 

 

Disengaging OilGuard

(K760 OilGuard)

When the machine is delivered, the OilGuard plug (A) and

the blue indicator pin (B) are fitted in the tank.

 

• If you are in a situation where you do not have access to

Husqvarna OilGuard oil, but you have oil of a similar

quality, you can deactivate the OilGuard system using the

disconnection function.

 

• To deactivate the function, pry off the OilGuard plug using

a screwdriver and then break off the indicator pin. Now fit

the disconnector plug © in the tank to complete

deactivation and to cover the hole.

 

• If you want to reactivate the OilGuard system, press the

OilGuard plug again. The system is then reactivated, but

note that the broken indicator pin cannot be refitted. A

broken indicator pin indicates that the OilGuard system

has been disconnected.

 

• A broken indicator pin indicates that the OilGuard system

has been disconnected.

 

• You can purchase a new indicator pin as a spare, but this

is only sold in grey which indicates that the OilGuard

system has been deactivated since the machine left the

factory.

[mikecotterill]

It works by using an optical sensor that detects the correct colour. The correct oil has a particular dye to accomplish just the right colour.

 

The next bit I borrowed from elsewhere on the interweb.

 

 

 

 

 

 

Disengaging OilGuard

(K760 OilGuard)

When the machine is delivered, the OilGuard plug (A) and

the blue indicator pin (B) are fitted in the tank.

 

• If you are in a situation where you do not have access to

Husqvarna OilGuard oil, but you have oil of a similar

quality, you can deactivate the OilGuard system using the

disconnection function.

 

• To deactivate the function, pry off the OilGuard plug using

a screwdriver and then break off the indicator pin. Now fit

the disconnector plug © in the tank to complete

deactivation and to cover the hole.

 

• If you want to reactivate the OilGuard system, press the

OilGuard plug again. The system is then reactivated, but

note that the broken indicator pin cannot be refitted. A

broken indicator pin indicates that the OilGuard system

has been disconnected.

 

• A broken indicator pin indicates that the OilGuard system

has been disconnected.

 

• You can purchase a new indicator pin as a spare, but this

is only sold in grey which indicates that the OilGuard

system has been deactivated since the machine left the

factory.

 

Where was that from mate? I gather there was a diagram with it? One of the worse ideas I can think of!

 

 

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[Daniël Bos]

That was on arborist site.com.

Only that text part of the manual though, no pictures.

But I think there's a little cover near the on/off switch that hides the trickery and that's where it can be disarmed.

[mikecotterill]

That was on arborist site.com.

Only that text part of the manual though, no pictures.

But I think there's a little cover near the on/off switch that hides the trickery and that's where it can be disarmed.

 

Yeah that's the bit we removed, but I couldn't understand the bit about breaking the tab off. But I found a PDF copy on the net from the info you posted. I'm still interested to know how it controls the engine revs though?

 

 

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[Daniël Bos]

Black magic!

 

I actually think its quite a good system. That machine is designed to be used on building sites etc where a large array of skills converge, not all clued up on the correct fuel for a 2T engine...

 

I could see it being quite good on "homeowner" type saws etc, but they'd have to adapt it so it could either be tuned to the oil of choice or be happy with aspen.

[mikecotterill]

Yeah well that's the issue, I agree it would be a good idea to check there was oil in there, but only working with a particular make oil, then causing the thing not to run right with no obvious explanation of the fault is just daft. Even if it had stickers on it saying only use husky oil guard oil would help. One has gone back to the hire shop last week with the same "fault"

 

 

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[Daniël Bos]

A bit more:

 

A blue box inside the engine of an OilGuard machine incorporates a light emitting diode (LED), which monitors the colour of the fuel fed to the engine. A yellow dye in the lubricant acts as a colour filter, blocking blue light and, in turn, preventing a photo-transistor from activating an electronic circuit breaker. If the system does not detect the pigment, then the circuit breaker connects to ground and limits the engine speed to only 3,800 rpm.

 

 

Ps I thought the bit about breaking off a thingie was just to indicate it had been run with the system turned off.

So the "non-guard" plug would not fit until the bit has been removed?

 

Pps: add yellow food dye and see if it'll run on normal mix.

[mikecotterill]

Well the bit you pull out has a bit of metal on it, which must obviously complete the circuit or not. I presume that's the bit you break off then shove the rest back in to stop crud getting in.

 

 

 

 

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[Eddie@aspen]

If you what to use Aspen then the only way at the present time is to use Aspen4 and Husqvarna 2stroke for the oil guard system. Still far lower emissions and cleaner running but still having to mix your own oil.