If your topping off you should match whats in there.
Original spec is SAE10 engine oil.
ISO 32 would be an equivalent hydraulic oil.
If the pump is tuckered you can use SAE20 or ISO 42 but it may be a bit sluggish until it warms up.
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Fifteen
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| Faulkner Farm, West Drove, Wisbech, Cambridgeshire, PE14 7DP, UK
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