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| We've had a 4430 from new and have tried several thing to help improve starting. We've sent the pump to get rebuilt several times but didn't help much. Replacing the batteries with 12 volts really helped (batteries lasted 7+ years). With the old 6 volt batteries they were only lasting a couple years and burning out the starter every second year too. With the 12 volt batteries the starter has lasted 20+ years. We recently replaced the old Delco style starter with a Denso knock off. WOW!!! Spins it over like a new tractor! It still needs a shot or two of either. We installed a recirculating engine heater and that helps immensely when it gets really cold.
With our 8640 we've found some come out with the Delco starter and some have the Denso starter. The Delco is a slow pig that burns out easily. We have a parts tractor (blown engine) with a Denso starter so we put it on the 'new' 8640 and it spins over like new. The tractor also has a second positive cable running from the battery to the starter (not sure if that is really needed). Our Kenworth uses 4x group 31 batteries so I put a couple of the old batteries in the 8640 and will be seeing if the other two will fit the 4430. We just had to convert cable ends to lugs (which are MUCH better than the lead clamp style).
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Old 30 and 40 series John Deere Tractors starting hard
