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Forum:

Mechanical Troubleshooting

Brand: Hyster - Model: S50XM

Number of messages: 13

START MESSAGE:

SPFBob
Michigan, United States

Hello and good day. We have an issue with our GM 3.0 engine stalling for no apparent reason. Once it stalls it will start right back up and go. The unit just had a tune up 6 weeks ago. Mind you somedays it will run all day w/o stalling other days it will stall numerous times. No fuel leaks, very few vacuum hoses on the unit, all hoses are new. New fuel vaporizer, filter etc...Changed the ignition switch. New air filter. Checked all electrical connections at the starter. Puzzled...

-------------------------
BS

Posted 27 Mar 2012 04:36 AM

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REPLIES:

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meliftman
Alabama, United States

It could be the diaphram device thatr prevents the throttle from snapping shut on deceleration. On newer units, it is adjustable at the lever. Have to ponder on it for more.

-------------------------
Liftman
Equipment, Inc.
Mobile, Al.

Posted 29 Mar 2012 11:03 AM

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Jplayer
North Carolina, United States

i believe meliftman is refering to what is called a "dashpot" or vacum deceleration valve located on the throttle linkage at the mixer body.
I'd also look into seeing if this truck has an antirestart timer on it, cat uses those and they have been problems in the past that cause issues such as this.

More thoughts to ponder ;o)

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Modified 29 Mar 2012 08:37 PM
by poster.

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meliftman
Alabama, United States

Hyster doesn't use anti-restart timer like the cat, on anything that I know of, but they do use a revolutionary switch which can do this also. It is mounted near the battery box. It must sense distributor rotation and can work intermittantly.

-------------------------
Liftman
Equipment, Inc.
Mobile, Al.

Posted 30 Mar 2012 12:14 AM

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Jplayer
North Carolina, United States

i just thought of one other problem we had with the GM V6's a while back, the oil pressure sensor beside the distributor can cause engine shutdown or no start conditions. I've had to deal with this once or twice and the guys in the shop as well a few times.
More thoughts to ponder on ;o)

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Posted 30 Mar 2012 01:01 PM

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SPFBob
Michigan, United States

First off i would like to thank everyone for the assistance. I am still pondering my issue. Let me go into a little more detail. S/N D187V31527B. Gave the Lift Truck a tune up 2 months ago, all was fine. We had a radiator issue. Installed NEW radiator. All is fine. A week or so later we started experiencing stall issues. Replaced LPG filter and vaporizer. No change in the operation. Removed carb cover and checked the diaphram, no holes, saw a couple weak areas. Did not replace. Found a leak at the intake/exhaust gasket. I don't know who did the repair on this but i found only 1/2 a gasket, someone cut the gasket ends off. The exhaust was gasketed with what looked to be Locktite 515. The repair lasted a few years. Replaced the gasket. No change to the stalling issue. :( That's where i'm at today. 3-30-2012 Going to do some electrical checks today, also checking sensors, "it's always a sensor issue" (Joke with the Mectron Engineering guys.) Thanks again folks.

Shannon Precision Fastener

-------------------------
BS

Posted 30 Mar 2012 09:08 PM

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bbforks
Pennsylvania, United States

When you replaced the radiator- did the engine overheat? I had a Toyota with a 3 L GM where heat was a problem. Had a intermitant shut off problem which turned out to be a bad coil pack.

-------------------------
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!

Posted 5 Apr 2012 11:31 PM

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SPFBob
Michigan, United States

Yippie Ki Ya!! The unit is fixed. Ended up being the Throttle Position Sensor and the Foot Pedal Position Sensor.

Thank you for all the assistance.

Bob

Posted 5 Apr 2012 11:44 PM

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Jplayer
North Carolina, United States

cool beans bob ......
woohoo! :o)

generally the TPS or PPS would throw a code or a flashing light on the dash though
You didnt mention anything about that, didnt notice it i guess ;o)

you replaced both units? the pedal position sensor AND the throttle position sensor (throttle body)?

yeesh ... money money .... :oD

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Modified 6 Apr 2012 08:40 AM
by poster.

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meliftman
Alabama, United States

This particular 3.0 engine has a throttle position sensor mounted on the throttle body that can be replaced without replacing the whole throttle body. Yep, them sensors can cause strange problems.

-------------------------
Liftman
Equipment, Inc.
Mobile, Al.

Posted 6 Apr 2012 08:52 AM

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Jplayer
North Carolina, United States

well thats good info to know michael
gotta love them hyster engineers that were thoughtful to think of that ;o)

cant say that about the mcfa engineers, we have to replace the complete throttle body if the sensor goes bad .... doh!

-------------------------
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net

Posted 6 Apr 2012 09:11 PM

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SPFBob
Michigan, United States

Had no lights flashing on the dash. Called up Great Lakes and sent in a tech with laptop, scanned system and found the 2 bad sensors.
Cost for the parts was approx...$180.00
Service call plus 2 hours approx.$210.00
Having an excellent technician...Priceless!

Posted 7 Apr 2012 00:08 AM

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meliftman
Alabama, United States

Sometimes you just gotta have the laptop with the right program.

-------------------------
Liftman
Equipment, Inc.
Mobile, Al.

Posted 9 Apr 2012 11:55 AM

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