Komatsu FG14:
Issue with forklift

Hi all,
My first post so apologies on it being a problem. (dont know the model either)

Ive recently bought an old forklift that I feel may have some issues. This is the 1st forklift Ive ever used so not sure if it should act like this or its busted.

So essentially, its an old komatsu propane fuelled lift, with a Datsun Pu engine.
Symptoms are that when put into drive - reverse it VERY slowly starts going backwards (even at WOT) and slowly starts to accelerate - so in short accelerates very slowly in reverse.
Popping it into forward does the same but is much quicker to accelerate than in reverse.
Additionally it seems that there isnt much power to the wheels as when it gets slightly stuck it doesnt spin the wheels or hardly attempt to get out of any slight dip it is stuck in. Does that make sense? I wouldnt want to try but I feel if I tried to push/pull some thing it wouldnt have much power to the wheels before the transmission slipped.
You can see the pic here - http://www.thetropicalplantcompany.co.uk/newimages/IMG_7429.JPG
Its stuck there and has hardly any power to try and get out of the ditch.
any ideas?
Thanks in advance
Ben
  • Posted 5 Jan 2016 00:43
  • Discussion started by BenBaron
  • 134123, United Kingdom
Showing items 1 - 7 of 7 results.
Hi Marc,
Just as a quick update on this, I had it pulled out of the mud and managed to have a drive about in it and lift a few heavy things. I noticed that is seems to be very slow to start moving in reverse and on first start was worse - it needed alot of revs to get it moving. After say 5 mins or so of running about it seemed to respond much quicker and acceleration improved.
What worries me is with a decent sized load (around 300kg) and an incline the truck seemed to struggle a little going up the hill. Ive a load of heavy pallets coming in March that will come in around 1000kg or more and Im fretting that although it will lift them easily I may not be able to get them up the hill into our area.

Does this seem like it could be low transmission fluid level (im hoping) as I check the level when engine was cold and Ive since found it should be checked when running. Also because it improved with running I hoping more fluid got to the torque converter....

Additionally the lubrication chart on the truck seems to suggest that the torque converter oil is a different than the transmission oil - if that is the case then I cant see where to check/fill torque oil.

Try not to give me bad news ;)

Thanks in advance
Ben
  • Posted 19 Jan 2016 00:01
  • Reply by BenBaron
  • 134123, United Kingdom
That would be much appreciated Marc.
I cant seem to send you a mail though - cant see it anywhere or even I can pm you? Perhaps I havent posted enough?
anyway my email is ben at brokerpartners co uk
thanks a million

Ben

Ps - checked the transmission fluid - that looks clean and enough in. Not checked diff fluid yet. Not sure how to check the inch valve although I have followed it from the brake pedal so sort of know the location where I should be looking.

Pretty sure there must be one as if I put brake on and rev no movement and engine revs freely, take pedal off and rev and it sounds strained.

When stuck in mud (which it is) should the wheels freely spin as it would with a car when stuck? all I get is a small "try" then it stops.
  • Posted 6 Jan 2016 21:27
  • Reply by BenBaron
  • 134123, United Kingdom
Hey Ben, I'm one of the old generation ;)
an FG15-10 started from '68 with an Datsun D11PU40 engine
an FG15-11 started from '77 with an Datsun D11PU144 engine
send me an email and will send you a part of the manual.
Regards
Marc
  • Posted 6 Jan 2016 02:06
  • Reply by marcb
  • ANTWERP, Belgium
You certainly know your stuff!!! Ive been searching for the model for ages!!! and yes it matches with Komatsu forklift, LPG, Model FG 15-10 that Ive found so great stuff!!!
manuals are my next hunt
Ps thanks for the tip about the rod - will check that out asap.
Thanks
Ben
  • Posted 5 Jan 2016 22:10
  • Reply by BenBaron
  • 134123, United Kingdom
Hey Ben, it must be an old FG15-10 or FG15-11 according to the motor that's been installed. If you follow the mechanical rods of the left pedal it will guide you to the transmission valve. it's normal that when you rev the motor up it will move. You can send the pictures to my email (it's in my profile) so I can take a look at it. I see what I can find of this machine.
Regards
Marcb
  • Posted 5 Jan 2016 03:37
  • Reply by marcb
  • ANTWERP, Belgium
Hi Marc,
thank you for the reply.
It seems my link to the image of the forklift has been removed. The forklift is an old one - I suspect 1980s but dont know for sure.

How do I know if there is an inching valve on the machine? If I put it in drive (forward or reverse) and not rev the forklift doesnt move at all (brake pedal unpressed). If I rev it then it starts to move. Is this normal behaviour?

Im trying to identify the model but not very successful at the moment.
Is there somewhere I can look for forklift workshop manuals to show me where the transmission fluid goes in/out?

If the clutch plates are burned then how big a job is that to swap?
  • Posted 5 Jan 2016 02:43
  • Reply by BenBaron
  • 134123, United Kingdom
Hello Ben, Please control 2 things at first:
1/ control the automatic transmission fluid level and colour (red)
2/ control the inching pedal and valve on the transmission, when you press the inching pedal (left pedal) you press in an axle on the transmission valve. When the pedal is released the axle has to come out completely!
If the colour of the oil is black I think that the clutch plates are burned :(
kind regards
Marcb
  • Posted 5 Jan 2016 02:18
  • Reply by marcb
  • ANTWERP, Belgium

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