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Read articles →This is a real repair walkthrough from an owner whose 3520 developed a hole near the radiator neck, causing coolant loss and cap leaks. He shows the damage, a failed JB Weld patch, then the full swap: draining coolant, removing four bolts and hoses, comparing old versus new radiator, noting a non-factory overflow tank, and refilling with 50/50 coolant. Useful for owners facing overheating or radiator replacement on this model.
Posted by an owner-operator documenting a hands-on DIY fix on their own 3520, not a dealer or professional shop.
There was a big hole near the radiator neck on the inside, which caused the radiator cap to leak and the tractor to spew antifreeze and overheat.
Drain the antifreeze, remove a hose clamp and hose, take out four bolts, disconnect the overflow line and the hose into the water pump, then pull the radiator out.
The owner found studs with threading that could take a bolt and washer, but decided not to reinstall them unless problems like jostling appear later.
The funnel instructions indicated it holds 5.5 quarts of 50/50 diluted coolant.
