Not trying to steal your topic, But I have a question related.
Hydraulic Fluid Question.
What about a 1967 GMC 9500 with a 65' Grove hydraulic ladder?
I did some searching a few years ago, and there is not much info out there on the Hydraulics at all.
Heck, I can't even find a print on the design of the hydraulic system.
AW68 will be the one I use, unless somebody tells me different.
My thoughts are, that if it is not a Fyrquel brand hydro oil, and the right viscosity, it will work just fine.

Thanks
Don



1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!