I have main spring completely rebuilt by Pohl Spring in Spokane WA. I have the small spring also. The connecting linkages and pins are available but only as a pattern to make new ones. $500
I know the mounting points are different on the 5u but am not sure if the spring is the same
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.
Antique Caterpillar
Machinery Owners Club
1115 Madison St NE # 1117
Salem, OR 97301
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