Cat Lift Trucks (& Caterpillar) M50DP:
CAT M50DP -- No errors on display yet truck won't move...

My CAT won't move. It does everything else right lift, steer etc...
I pulled the cover on it put the logic board in diag mode but the instructions there fail the clarity test!
It says at the top of the block:
SYSTEM CHECK WITH STATIC DIAGNOSTICS
Disconnect battery prior to disconnecting drive fuse.

Since I can't find a "drive fuse" any where on the schematic, I'm pretty
much at a stand still.
There is a line fuse attached to the line contactor. However when I pull that fuse, the display still shows d.
I've tested that fuse and its good.
Anyway I just want to cycle thru the items in the list but can't get past that fuse...

Battery voltage is a 37.1 so I do have a partially charged battery.

At turn on the line contactor does pull in and a few seconds later drops back out. No other contactors do anything...
Thanks in advance,
Calvin
  • Posted 25 Mar 2017 07:27
  • Discussion started by calvin
  • Illinois, United States

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