Crown SC 4000 9A112945
The original problem was steer motor smoking and brushes worn out, it was looking pretty tuff but had it rebuilt.
With in the first two hours it through out all the copper out of the armature and seized.
Ordered a new motor and installed , checked voltages, checked pump and after two hours motor is extremely hot.
This machine only has a two hour battery so at this point voltages were getting low but the other motors did not show any signs of overheat.
What might cause this problem ?
Showing items 1 - 5 of 5 results.
Curiosity killed the cat....pressure checked at 1250 psi right on, motor cable resistance good but oil soaked in areas so I replaced them and voltages 35.8 to 36 volts under load.
I`ve been monitoring the issue, still running hot like a firecracker ( like the sister truck ) but still running strong :-)
Check the relief valve setting in the steering pump, its built in. Should be 1200-1250psi I think, measure at the pressure outlet from the pump or before it goes into the SCU (orbitrol). If the steer pump relief valve isn't unloading it will overload the motor. Also i'd recommend putting a clamp meter on the motor cables and see what current its actually drawing as well as checking the voltage at the motor compared to the battery.
also consider the pressure settings (?too high a relief setting?) and the possibility of pulling in air through the inlet side hose.
Good call Swoop , sometimes we over look the obvious. Cables looked ok but will check the resistance.
2 things come to mind
first the 2hr battery thing, when voltages do get low the amp rate increases exponentially so this may be part of the heat contribution.
second, the cables to the steer motor, are they good? high resistance in the cables can cause this heat issue.
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