Hyster 635XL:
starts then dies

i have a Hyster 635XL that starts runs for a few seconds then dies out checked the vaporizer and lockout all the diaphragms look good and nothing sticking. also when it dies out 2 lights illuminate on the dash but they are not labeled as to what they are. any help would be appreciated thanks.
  • Posted 26 May 2016 02:58
  • Discussion started by jsanchez89
  • Illinois, United States
Showing items 1 - 10 of 10 results.
324692 is the hyster number for the engine oil filter for the mazda M4-121 engine.
  • Posted 3 Jun 2016 05:55
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
ok so i pulled the mixer apart and found that there was a lot of build up in there. cleaned it up and shes a runner thank you for your help last question i have is do u know the oil filter # for this forklift gonna do an oil change and i have multiple filter #s coming up searching it and want to use the right one thanks again for your help swoop223
  • Posted 3 Jun 2016 03:34
  • Reply by jsanchez89
  • Illinois, United States
Thank you swoop223 i will pull the mixer apart tomorrow and see what it looks like in there and see if i can determine what is going on with it. I will post what i find tomorrow and if it has been fixed or not
  • Posted 2 Jun 2016 08:31
  • Reply by jsanchez89
  • Illinois, United States
the LP system on this truck is an impco with mazda M4-121 engine?
fairly basic LP system, if lockoff checks ok the only other problem could be in the vaporizer which you said you had rebuilt?
and then is the mixer diaphragm, check the seat where the metal bullet inside the diaphragm where it fits over the air inlet nozzle inside the mixer. If it is dirty or the bullet button does not seat properly, if spring is damaged, or if vacumm hose is not connected to correct location the engine will not run correctly.
The vacuum hose to the lock-off hooks directly to the base of the mixer housing. Then there is a second vacuum line that goes from another port on the mixer to the vaporizer as a balance line for the outer diaphragm. Then there is a line between the vacuum lock-off and the vaporizer, usually a steel line.

i would pay attention to the mixer though, it sounds like there is a problem inside that which is why it will crank and run for a sec and then shut down.

Also check the engine oil pressure switch, see if there is more than one pressure sensor, if there is make sure it is not leaking, it could be leaking down while running , loosing its pressure so to speak and causing the ignition to shut the engine down. If there is just one sensor then more than likely it is just for the oil pressure light only and would not affect the engine if it fails.

i did not mention it before, but you said something about the 2 lights lighting up on the dash when the engine shuts off? that is normal, those are the ignition light and probably the oil pressure light coming on when the engine stops while the key is still turned on.
  • Posted 2 Jun 2016 08:15
  • Modified 2 Jun 2016 08:19 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Haha just realized i kept reading it wrong i feel dumb thank you for your help so far hope to hear from you soon
  • Posted 2 Jun 2016 01:10
  • Reply by jsanchez89
  • Illinois, United States
Mr Sanches
I looked at your photo of the dataplate and as i suspected it is an S35XL with a serial number B010B6447K.
Let me do some checking in my material and see what i have on this, I'll get back to you later on today and let you know what i find,

Thanks
  • Posted 2 Jun 2016 01:03
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
https://goo.gl/photos/kTQBWGEQbEc4u3ku7
I attached a picture to show model and serial # the 635xl i pulled from the tag. But i have also taken apart the vaporizer and replaced the diaphrams and it appears to be working how it should. And i do have spark because it starts runs for a few seconds then dies out.
  • Posted 1 Jun 2016 23:32
  • Reply by jsanchez89
  • Illinois, United States
model number looks wrong? are you sure about that one?
they usually start with S35xl or H35xl (for gas and lp trucks)
electric trucks usually start with like E35xl.
AND a truck serial number would be more helpful for more accurate information.

besides the above
check to see if you are getting spark at the plugs.
if not then you have an ignition/distributor problem.

verifying the fuel lockoff is only one step, the lp vaporizer/evaporator can also be a problem, plus check the diaphragm inside the mixer and make sure it is intact and not crudded up or damaged.

without the correct model and serial number it is going to be difficult to help you with accurate information.
  • Posted 1 Jun 2016 21:55
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Sorry for the delay i checked the fuel lockoff by disconecting the fuel out hose and drawing a vacuum on the lockoff and i get flow of lp coming out.
  • Posted 1 Jun 2016 04:11
  • Reply by jsanchez89
  • Illinois, United States
Are you loosing ignition? How did you check the fuel lockoff?
  • Posted 26 May 2016 22:34
  • Reply by BREWSKI
  • Nebraska, United States

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