Slow speeds. - Technical Troubleshooting discussion in Forkliftaction's forums

Crown RC3020-40:
Slow speeds.

hello all. working on a crown rc302040
ser # 1a222700

The machine is slow. Battery is good. Seems to be faster in reverse. Seems to completely quit sometimes when turning handle to the left. I'm aware of the switches underneath that slow speeds depending on which way you're turning. I just replaced the rear wheels on this machine and while I was under there I repaired the wiring on one of the switches and cleaned them up. But without a manual, what other checks could I do? Adjust the pot in the multifunction handle? Thanks.

Posted 27 Jun 2019 01:28
Discussion started by jackson_p
Tennessee, United States

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I only have 10 or 11v at all the drive motor terminals, battery voltage is 36.94v. Anyone know what could cause this?

Posted 16 Aug 2019 01:39
Modified 16 Aug 2019 01:40 by poster
Reply by jackson_p
Tennessee, United States

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I took apart the diode block, with the SCR, main rec and stuff, cleaned it all up checked all the wiring, did what tests I could, and reassembled it all. Everything back correct, and now the machine won't even move ! You can hear the motors trying, both contactors closing up in both directions. One contactor is new. It just has no **** , a few hours ago it was running around the shop full speed. w.t.f. !!!!

Posted 15 Aug 2019 05:43
Reply by jackson_p
Tennessee, United States

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just lifted machine up in air to verify both drive wheels are spinning. they are, just slowly. speed is being reduced somehow.

Posted 14 Aug 2019 22:48
Reply by jackson_p
Tennessee, United States

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spoke too soon, intermittent problem. lost speed again. got it back, lost again. here we go again with the diag.

Posted 14 Aug 2019 06:53
Reply by jackson_p
Tennessee, United States

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It was the entry bar switch. I jumped the 2 pin connector down there and now have full speed.

Posted 14 Aug 2019 01:03
Reply by jackson_p
Tennessee, United States

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What is the total battery volts at the main connector? If you are reading 36 volts with no load your batteries are dead.

Posted 14 Aug 2019 00:30
Reply by BREWSKI
Nebraska, United States

BREWSKI

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Tb11 voltages are :
1 = 32v
2 = 0v
3 = 0v
4 = 0v
5 = 36v
6 = 36v

steer switch inputs are good, height switch is working. machine is still slow, tilt up also very slow. any ideas at all ?

Posted 14 Aug 2019 00:20
Reply by jackson_p
Tennessee, United States

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Well we sent the old battery out and I didn't get the details I guess it was bad. Replaced it with what looks to be like a reman... forklift is moving now but it is still slow.

Posted 7 Aug 2019 23:21
Reply by jackson_p
Tennessee, United States

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any other ideas before possibly sending battery out to be repaired?

Posted 17 Jul 2019 22:26
Modified 17 Jul 2019 23:38 by poster
Reply by jackson_p
Tennessee, United States

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getting about 2.110 volts out of each cell... i'm sure this has a lot to do with it considering manual states older batteries can read 2.45 to 2.55.....

Posted 17 Jul 2019 00:29
Reply by jackson_p
Tennessee, United States

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moving again now after a short charge... still slow as not being able to pull a greasy string out a cats rear end.

Posted 16 Jul 2019 23:41
Reply by jackson_p
Tennessee, United States

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the switch is the same, and I've installed a different one in better shape, without resistor... i tested the switch before install and its doing what its supposed to do... now the machine won't even move fw/rev...... tried old switch again, in hand, with resistor wired up, without resistor, swapped wires... nothing... this thing is such a **** and i'm really getting sick of it lol. putting it on charge for now..

Posted 16 Jul 2019 23:32
Reply by jackson_p
Tennessee, United States

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The switch should be the same

Posted 16 Jul 2019 08:24
Reply by Ifixit
Pennsylvania, United States

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Thanks for the explanation. Understood, I guess the resistor could be completely bypassed then without any change of machine operation? (admitting freezing temps).. What I'm getting at is can I replace it with a switch that does not have the resistor included?

Posted 16 Jul 2019 07:50
Reply by jackson_p
Tennessee, United States

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Those resistors act as heaters for the switches. That truck was built for freezer applications. When the sensor senses temps below 32 degrees, it pulls in a relay and sends voltage to those heaters. It keeps moisture from forming inside the switch.

Posted 16 Jul 2019 07:34
Reply by Ifixit
Pennsylvania, United States

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