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DISCUSSION FORUMS : Forkliftaction.communicate
Forum: Technical arena
Discussion:  Nissan power steering problems
Number of messages: 19
START MESSAGE:
aled_w
wales, United Kingdom 		A power transistor failed causing damage to an output transistor for the power steering on the main circuit board. We have been told by Nissan that this was due to excessive use of the steering lock causing damage to the current limiting circuit and that repairing the circuit may cause further damage. A new circuit board is £2500.
Our concern is that due to a small warehouse we regularly use the steering lock. Surely the Fork truck is desgined for regular steering lock use and that the current limiting circuit should be desgined to protect the system from any problems. What certainty do we have that 18months after buying a new circuit board the same thing happens again. What risks are there in reparing the board.
Can somebody please advise us as we are only a small company.

Posted 21 Jan 2006 00:46 AM Reply  Report this message
REPLIES: Sort replies by
daniel_g
Flevoland, Netherlands 		If you have only had the unit for 18 months (I'm guessing as this is the only time reference you give) and based on you being a small company you have low hours then you need to chase up Nissan.

Manufacturers as far as possible build in safety systems to protect the various circuits, but this can sometimes either be overlooked, not upto the job, or simply not possible, economically or design wise.

Having said the above sometimes there are some issues which occur which can be related to the application, but I am not sure yours is one of them by the sounds of it.

If your machine is only 18 months old and the hours are reasonable then I would suggest pushing the agent who sold the unit harder for either complete or partial cost recovery of a new part.  If you still have no sucess, and you are only dealing with a Distributor or even lower on the chain a sub-dealer it could be worth contacting Nissan themselves.  You can find a UK contact name on the Nissan Forklift Europe website under Distributors......just an idea.

Posted 26 Jan 2006 04:23 AM Reply  Report this message
Lifter
New South Wales, Australia 		I presume the model is a CWP02 we have a few of these on hire and have had the same problem.  We have tried repairing the boards and aftermarket transistors but usually not successfully.  We believe the main cause is when the battery gets low and the truck is held on lock or hits something it spikes the transistor which then blows the board.  Fit a curtis guage to the machine to enusure hydraulic cut out when the battery charge is low the guage on the truck is not all that reliable.  Fit the 100amp transistors the latest ones if the originals were the 75amp type.

Posted 27 Jan 2006 08:10 AM Reply  Report this message
mike_n
Alberta, Canada 		I agree with Lifter.
We too have found these systems poor.
Posted 11 Feb 2006 02:50 AM Reply  Report this message
aled_w
wales, United Kingdom 		Thanks for your replies. We have followed Lifters advice and all is well at the moment. We will take extra care with the batteries in the future.

It's interesting though , that Nissan will not issue any information with regard to this card. They seemed to now about the problem when we explained what had happened and said the only solution was to buy a new card at a cost of £2500.

It seems Nissan believe they can make a lot of money from your own mistakes.

Thanks again for all your help.

Posted 16 Feb 2006 01:52 AM Reply  Report this message
FrankieW
Parksville Areal, Canada 		Hi welshman.
its true that you must have a PO2 that a very reliable truck generally-However the weak parts are the steering & the pump contacter.
We here in Canada have had a lot of problems with the steering issues.
It is the weakest part of the truck you need to keep on top of the maintenence of the steering motor which also has a sensor inside of it - definately not one of nissans better ideas- however getting back to your Question you can buy a Rebuilt card from your friendly nissan dealer they may ( the parts dept ) not be aware of this or to lazy to check.

The other weak piont is the pump contacter if you have transisteroised panel you are ok but if you purchased the cheap model you will be burning out the contact tips every 5 mins there is a relativly cheap fix for this let me know if you need the info.

-------------------------
FrankieW Technician

Posted 2 Jun 2006 10:31 AM Reply  Report this message
adrian_w
East Yorkshire, United Kingdom 		Also check the steer motor for earth leakage as carbon build up can cause the units to fail.

-------------------------
Premier Mechanical Handling,
Hull.
UK

Posted 7 Jun 2006 07:18 AM Reply  Report this message
freetman
Pennsylvania, United States 		What do you mean by steering lock?

Posted 13 Jul 2006 00:25 AM Reply  Report this message
justinm
New York, United States

 		i think he means they steer it till it hits the stops and holds it there and the steer valve goes into bypass wich works the motor harder
all traction/pump/steer systems will suffer if ur not religious with ur charging habits
the difference between old and new equipment is the cost of contactor tips and recs over entire transistor boards
itll take 5 breakdowns of an old scr system to equal 1 blown board
hard lessons to learn

here in ny ppl are very stubborn trying to push 20 hours use on a 4 hour charge and they dont understand y i am there twice a week lol

when the voltage is low the amps go up and so does resistance so if there is a bad connection/ solder point or anything the problem increases exponentially as resistance increases as bad components get hotter and poof ur out 4500 us dollars on 1 call
also check for worn motor bearings or any restrictions/ crimped hydraulic lines in the steer system

Modified 16 Jul 2006 07:20 AM
by poster. 		Reply  Report this message
freetman
Pennsylvania, United States 		Does anybody know the part number is for the 75 amp IGBT’s?

Posted 21 Mar 2008 04:48 AM Reply  Report this message
mok_e
JOHOR, Malaysia 		Dear freetman,
You can try refer to RS component or farnell component for 75/100 amp IGBT.
Normally if I found steering malfunction, we will modify using local make steering board.

Posted 28 Mar 2008 03:34 PM Reply  Report this message
diego_c
Buenos Aires, Argentina

 		29327-2K011-F1 (sold in pairs)
Information from Customer Satisfaction department-Parts

Posted 5 Oct 2009 00:35 AM Reply  Report this message
bigd_b
Victoria, Australia 		This problem can be fixed for under $1000.00.
Send me board and I will repair.
I will return the repaired board to you
with a new set (2) of IGBT transistors.
I have done about eight in the last year or so
with no returns, incuding two for Nissan!
Posted 5 Apr 2010 11:38 AM Reply  Report this message
elektrodrive
West Midlands, United Kingdom

 		If you cannot get the board repaired and are willing to use it with it as is then you can always add a contactor in series with the motor and feed the contactor coil supply off some form of interlock switch handbrake, seat switch etc.  Most likely will still have a error code on the display though, but should work your steer motor.

Posted 2 Jun 2010 05:55 AM Reply  Report this message
micky
west sussex, United Kingdom 		on po 1/2  when you have replaced the igbt (use 100 amp) hold down buttons 1 and 3 swith on and go up to steering and change current limit and steering effort to 85% from the original 110%.(official nissan service information)

Posted 2 Jul 2010 04:29 AM Reply  Report this message
freetman
Pennsylvania, United States 		Is this part of a Nissan service gram? If so could you send it to me?

Posted 3 Jul 2010 04:39 AM Reply  Report this message
Barry_m
B.O.P., New Zealand 		I have repaired many of these cards with this problem over the years and so far the repair cost has always been under NZ$300. I often wonder about some of the outrageous amounts some people charge for these repairs.

Posted 5 Mar 2013 03:12 PM Reply  Report this message


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