Hi, i'm new in here.
I just bought an Clark TM12 forklift. This is my first forklift, so i need a users manual, service manual, and maybe a wirediagram (Having some troubles)
Well, the forklift drives well, except, It can't raise the forks, and the steering don't work either.
I dit find the contactors/relays? that starts the steeringunit, and the hydraulicunit.
If i give the coil power directly from a powersource, the respective device start. ie. the steeringmotor, or the hydraulic unit to lift and tilt the forks.
As an "emergency-repair" to use the forklift, i coupled a relay to the switch sitting near the levers to raise/lower/tilt, and it works great.
The steeringunit is started by a switch, coupled to a relay. So everything is working, just not the correct way.
It will be nice to find the failure, so everything works like the factory had in mind. So i have a bounch of questions
Why is there 4 switches to the steering? And what are they starting/stopping? I see two of the switches, triggers another relay (Not the one that starts the motor)
There is a box labeled Pulsomatic Mk. X, i don't know if that is a sort of controller?
What can i do to locate the failure? Bad connections, broken controller?
Thanks in advance. (And sorry, English ins't my native language)
Showing items 1 - 13 of 13 results.
Did you ever get this fixed? I have a problem too!
I have a fault with my pulsomatic controller! Anyone with a circuit diagram or wiring diagram? Any help or advise would be appreciated.
I repaired one TM12 with problem in pulsomatic controller electronic. It would been much easier with schematic diagram to find the two faulty transistors
the four switch are for the weels when i go left and the steer weel is om position 30 degray the left motor go turn backwards and when i go to right same the right motor go turn backwards
Its 3 wheel when this is not working you have no power when the steer wiel is compleet turn to left ore right and for smooth drive left en right direction. and you can make circel drive
John
Look always to SN. number
And to Gef....... very importend there are different drawings
with littel small box below sometimes 3 ore 2 ore pompcontroller
There many type
Give the Serial number Complete with Gef number 7000 - 7001 - 4800 5400 etc etc several type
regards
John.
Hi, send me an email at: carstenks (at) gmail dot com, and i'll send you the wiring diagram.
the wiring-diagram would be a great help
Sorry, i just have the wiring-diagram.
did you ever find a parts, service, user manual for a clark TM 12.
Really could use a copy, any help would be greatly appriciated
thanks
Hello, could someone send me the circuit diagram of this Clark?
Thanks!
The Controller allows the triggered input through the plastic logic card to sellect your direction contactors, and also allows the system to trigger the thyristors within the aluminium block which in turn allows your motors to turn and drive the truck, if there is a fault condition the system has a fail safe circuit in the card which will trip out the contactors to prevent any serious damage or injury. Traction control is in reference to the pulsomatic system.
As for the switches on the steer hub, not sure but sounds like your truck is probably twin drive with 2 motors, and the switches probably drop out one of the motors when in one lock and vice versa. I know the system but am not familiar with the actual truck sorry.
Thank you for your answer, Elektrodrive.
Yes, the controller is as you said an alloyblock, and a plasticbox. What is the controller exactly doing? - I've got a wirediagram by email, and the circuit looks quite simple.
As far as I can se from the diagram, the coils are negative-triggered/fed with a positive constantly.
Btw. in the diagram, tractioncontrol is mentioned - Is this like in a car? Mine is spinning the wheels easily, so i guess this is broken.
What is the idea with 4 switches on the steering hub? 2 of them seems to activate a contator (Not the same as starts the hyd-pump), when the wheel is fully turned.
Hi there
I dont know much about the truck itself, but I can tell you a bit about the pulsomatic. Its a cableform control unit which controls the drive system. If i understand its a pulsomatic mark 10 system then it will be a power unit made up of 2 black aluminium blocks clamped together. Some of these have a small module which has a row of spade terminal connectors normally coloured yellow, blue,red, white and green i think.
The other unit looks similar but has a logic card enclosed in a black plastic box known as the 17191 logic card.
From what i understand for these controllers, the power steer and pump do not work through pulsomatic controller, rather the contactor is supplied with a direct feed either pos or neg and the other feed to the contactor coil is switched through switches.
For example if the power steer contactor coil is fed with a direct positive, then perhaps either through the park brake switch or seat switch they feed a negative supply to the contactor coil.
Similar with pump contactor if its fed directly with a positive then the hydraulic lever switches the negative supply.
The problem is possibly a lost feed either directly to the contactor coils or from the switching side. I would guess the direct common feed to the contactor coil has been lost. If someone can provide a diagram it should be simple to follow.
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