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520 Tachometer Lamp Causing Housing Damage

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Cable

The 520 tractors were sent to dealers with an incorrect lamp in the tractor's tachometer.  This lamp was of too high a wattage such that the plastic housing gets burned to the point it is ruined.  Suggest owners of 520 tractors from years 1991 to 1995 read the service bulletin.

 

 

Not specified in the bulletin is how to tell if your tractor has the incorrect lamp.  Remove the lamp from it's holder and look for a number stamped on the brass base.  It should read 53x in which case your tachometer is probably healthy.  If it reads 1816 the tachometer will be burned by the extra heat from the lamp.

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smoreau

Interesting! I know that there is a lot of stuff in the tach and they are no ware as bright as the other gauges. They always fog up in the cooler months.

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boovuc

Noticed the same thing Scott.

 

I'll have to look. Right now, I have a lamp that is burned out and I can't get it to come out of the lamp holder. I can't remember which gauge it was in though without looking and I'm not going back outside tonight. I froze for 9 hours straight at work today!

 

Thanks Cable!

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zieg72

My 520H housing was melted

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boovuc

The bulb that is out on mine is the vacuum, ("Power" gauge). The tach is lit but I noticed it is noticeably dimmer than the bottom two gauges.

 

What is the proper Toro number for it and are these bulbs available elsewhere as in NAPA, etc?

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cheesegrader

One of mine is melted.

I would never have figured out what is wrong without this.

Thanks

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P3x

Had the same problem with a couple of gauges on my 520.  Replaced the bulb with a GE53 (14.4V) think the Toro PNs crossed.to it. After reading this post, think the GE bulb may be too "Hot..."

 

Bulb would not stay in the socket. Fixed by making a form of the inner ID of the socket with thin aluminum flashing. Applied a thin coat of vaseline to flashing contacting the burnt away area then applied Hi Temp RTV around the area.  Has held up well so for (2-3 years).

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