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hydraulic fluid

mark sr I've always used ISO 68 hydraulic fluid in my NAA because that's what it called for but I was wondering if the fact that it has the replacement piston pump changes things ?? I've used the ISO 68 [from TSC] for 20+ yrs and my hydraulics work good although it was slow until it warmed up this past winter. It does have some water mixed in with the fluid so that might be why.

Just want to make sure I use the correct fluid when I change it.

Jim Loveridge I've been using Valvoline R&O hydraulic fluid in mine for several years now. It seems to work just fine. The R&O stand for rust and oxidation.

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