My M4700 is a pretty simple tractor...or so I thought... Only one safety switch activated by the range-lever (the forward-Reverse-Low-High selection lever) on this DT (manual transmission.). The neutral start safety switch is kind of troublesome to get to... and that was my suspicion because occasionally turning the key would not result in engine rotation despite other things lighting-up (such as a high battery-discharge from the GlowPlugs which apparently heat up anytime the key is turned to Start.)
But if I wiggled that Range lever a couple times it would usually turn over quickly and start.
However this afternoon.... no joy. Wiggle that lever to death and no rotation.
Grab a VOM and 12 volts available at the big starter-terminal (direct connection from Positive Battery Post, of course.)... but no rotation. Pulling the little spade connector off the starter-solenoid I only measure 10-volts when the key is turned to the start position.
I struggled beneath the tractor and reached over the rear axle and disconnected the neutral start switch associated with the Range Lever and by-passed the switch. No joy.
Grabbing my good ol’ Snap-On push-button starter-by-pass switch, I hook one alligator clip to the big starter terminal and the other alligator clip to the spade terminal on the starter-mounted solenoid...and she starts right up!
Soo... apparently 10 Volts ain’t enough (perhaps low current?) but direct-connection to battery voltage will rotate the starter.
I believe the last time this happened I suspected another heavy-duty relay (the pic on the far right below of the black plastic relay) inside the instrument panel that Kubota wants $110 for (and cross-reference aftermarket part is the same)... I had disassembled it and used my wifes nail-file to clean the points and the starter worked again. Perhaps this is the problem this time also... but somehow I was reluctant to believe it Previously and this time I wasn’t convinced either.
I have a heavy-duty metal-can relay (The pic on the far left below... a “grounded” relay...meaning just like the black pastic one, it requires power to it’s little terminal to close the relay main contacts... (as opposed to the typical “powered“ automotive relay that is not grounded and the little terminal is looking for a ground to close the main contacts).... It is a $20 part and I plan to replace the cheap plastic $110 Kubota part with this large metal $20 one and I’ll report back.
But if I wiggled that Range lever a couple times it would usually turn over quickly and start.
However this afternoon.... no joy. Wiggle that lever to death and no rotation.
Grab a VOM and 12 volts available at the big starter-terminal (direct connection from Positive Battery Post, of course.)... but no rotation. Pulling the little spade connector off the starter-solenoid I only measure 10-volts when the key is turned to the start position.
I struggled beneath the tractor and reached over the rear axle and disconnected the neutral start switch associated with the Range Lever and by-passed the switch. No joy.
Grabbing my good ol’ Snap-On push-button starter-by-pass switch, I hook one alligator clip to the big starter terminal and the other alligator clip to the spade terminal on the starter-mounted solenoid...and she starts right up!
Soo... apparently 10 Volts ain’t enough (perhaps low current?) but direct-connection to battery voltage will rotate the starter.
I believe the last time this happened I suspected another heavy-duty relay (the pic on the far right below of the black plastic relay) inside the instrument panel that Kubota wants $110 for (and cross-reference aftermarket part is the same)... I had disassembled it and used my wifes nail-file to clean the points and the starter worked again. Perhaps this is the problem this time also... but somehow I was reluctant to believe it Previously and this time I wasn’t convinced either.
I have a heavy-duty metal-can relay (The pic on the far left below... a “grounded” relay...meaning just like the black pastic one, it requires power to it’s little terminal to close the relay main contacts... (as opposed to the typical “powered“ automotive relay that is not grounded and the little terminal is looking for a ground to close the main contacts).... It is a $20 part and I plan to replace the cheap plastic $110 Kubota part with this large metal $20 one and I’ll report back.
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