CMP40L sn#CMP450L-0211-9589KF This unit was being used and all of the sudden lost all travel functions.this has the high/low trans.All of the solenoids are working when the gear is selected.I have changed the charging pump,disassembled the control valve and found no abnormalities.changed the filters on the top side and the screen in the lower case.I am looking for any guidance on this as I dont know how else to proceed.Thank you.
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After checking the inching valve if this makes no difference check the following below.
On the side of the transmission valve chest (end nearest to the front of the truck)there are 2x blanking plugs.Remove these plugs.Internally there is a port which you can remove with an allen key.This usually blocks if there is any contamination and causes the truck to lose all drive.I would also reccomend removing the transmission oil screen which is located on the underside of the left hand side of the transmission and has a small hose running to the transmission pump.We have seen a few of these where they are heavily contaminated with aluminium after the torque convertor has started to break up leading to contamination of the transmission oil system.
It sounds like the inching valve is stuck. I would like to see what the pressures are in order to get a better idea of what is happening.
tried hooking a pressure guage to it to see if there is any pressure on the torque converter pump or clutch packs yet?
should be some plugs in the control valve to put a guage and check this... no?.
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