I've only heard of one PT fire that I recall. But, when you think of a gas engine, with a five gallon gas tank and 10 gallon hydraulic tank only inches away from it on the PT 422/425, in the same engine compartment, not counting the gas line, hydraulic lines, etc., it is a prudent measure...
PTRich had added a fire extinguisher to my Kohler-powered PT-425 when I got it. I'm glad it's there, and even more glad that I've never needed to use it.
EXAMPLE: When I was clearing my lot, the contractor had a hydraulid line burst on a 20-ton excavator, spraying fluid onto the muffler and caught on fire -- only minutes after we'd set fire to a huge brushpile about ten feet away from the excavator and got it roaring. Th eexcavator was being used to feed that fire....
Luckily I had a 13,500 GPH pump sitting at the pond, and a 1" PVC hose run to the site -- just in case. We put the engine fire out with the water, but could not put out the fire from all the hydraulic fluid that it dumped underneath when all the adjacent hoses burned...
We pumped thousands and thousands of gallons of water onto that excavator and the adjacent brush pile for the next three hours or so, just to keep the fire under control long enough for the contractor to rush to another site site and haul back a larger excavator to help move this disabled one. He had a little Komatsu dozer on site, but it wouldn't budge the excavator. When he returned with larger excavator, they used it to pull while the little dozer pushed and finally moved the disabled one. Then the dozer was able to use dirt to put out the hydraulic fluid fire.
I have no idea how much water we pumped that scary afternoon, but we dropped the water level in a 4-acre pond by about 4"...
If I hadn't had the pump and water line pre-positioned, the excavator would likely have been a total loss. As it was, I understand it cost about $15K to repair it.
Better safe than sorry...