ok, i have this unit that will side shift fine, travel fine but when you try to lift the motor does turn on and spin, i see its "cavitating" in the tank, thought it was a valve stuck open, replaced it but still doing the same thing, I'm thinking the valve in the cylinder may be stuck, we can't do a big tear down to check due to located in a store and can't leave down or open, any thoughts on this? we have power to the solenoid, we did "bump" the lift with the valve out and it gets pressure as well. thanks in advance.
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Kinda the direction I was thinking was the relief valve, I tried the pull the sideshift handle at the same time and nothing, the battery shows good during sideshift but drops with lift not terrible bit it goes to 23 vs sideshift of 24, I think I will try the relief valve, with the pump working like you said that's really the only other option, I will post the outcome, thank you all for the help.
Have you tried when lift lever operated pulling side shift lever? If this makes the truck work I suspect there is a fault in the truck software and it will require the operating software reloading.
forgive me for stating the obvious but, if you have cavitation in the tank the hydraulic motor must be turning to create flow in order to make cavitation. you would actually hear the motor running. The contactor would pull in (with an audible click), then the motor would start running immediately with an audible sound.
But before you do ANY of that check your battery voltage, make sure the battery is fully charged before any testing. Does this have an industrial battery? or is it a battery pack? Check the fluid, make sure it is over the top of the cell plates if you have access to the cells. If the battery is discharged it cannot supply enough voltage to make the motor run correctly.
24v system? you should be reading on a vom at least 25.5v or more for the motor to turn fast enough and have the power to run the hydraulic system.
Even a dead/discharged battery should run the motor slowly, it just may not have the power to do much under a load. But if the motor is really not turning then those batteries are more than likely dead.
(IF the battery checks out ok) what i would check is the relief valve, if that is stuck open, pressure spring broken the fluid would just bypass back to tank.
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