code 66 and 68 - Technical Troubleshooting discussion in Forkliftaction's forums

Crown SC4000:
code 66 and 68

could us a diag break down what to check
for code 66 and 68 truck will move backwards but not forward

Posted 30 Jan 2013 02:22
Modified 30 Jan 2013 02:24 by poster
Discussion started by tschoap
South Carolina, United States

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I have a similar occurrence on an SC4020-35. When attempting fwd. or rev. the unit moves about an inch or two and then stops and either code 66 or 68 appears. Any ideas!

Posted 14 Sep 2023 07:46
Reply by DaveSr
California, United States

Never too old or too experienced to learn more.

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sc4000
Code 66 - Field fet exceeded expected current limit
Code 68 - PMT enable signal from slave controller to master controller went below 5vdc.

seeing as how you can drive in reverse i would guess you have lost a transistor for fwd. and since the slave is dropping enable it is more than likely in the slave controller.

Posted 11 Feb 2013 09:53
Reply by stam
Ontario, Canada

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replace the complete directional contactors.

Posted 30 Jan 2013 22:35
Reply by edward_t
South Carolina, United States

"it's not rocket surgery"

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