Discussion:
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
  • By calvin
  • joined 14 Jul'16 - 19 messages
  • Illinois, United States

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

Editorial calendar - planned features
CONSTRUCTION FORKLIFTS
HANDLING GOODS IN THE COLD
LOADING/UNLOADING FREIGHT
BROWNFIELD AUTOMATION
FORKLIFT ATTACHMENTS
BATTERY AFFORDABILITY AND LIFETIME
FORKLIFT SAFETY
Global Industry News
edition #1258 - 27 November 2025
In this week’s Forkliftaction News , we report on Hyster-Yale laying off staff in the US amid what it describes as “challenging market conditions”... Continue reading
Upcoming industry events …
December 4–7, 2025 - Goyang, Korea, Republic Of
March 10-12, 2026 - Hong Kong, Hong Kong
June 30-July 2, 2026 - Birmingham, United Kingdom
JLG G12-55A
Morgantown, Pennsylvania, United States
Used - Sale & Hire
Toyota 02-2TD20
Yokohama, Japan
Used - Sale

PREMIUM business

Lift Technologies Inc.
Global leader - manufactures masts, carriages, sideshifters & fork positioners
Editorial calendar - planned features
CONSTRUCTION FORKLIFTS
HANDLING GOODS IN THE COLD
LOADING/UNLOADING FREIGHT
BROWNFIELD AUTOMATION
FORKLIFT ATTACHMENTS
BATTERY AFFORDABILITY AND LIFETIME
FORKLIFT SAFETY