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Forklift question

Old 01-03-2019, 10:26 PM
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Default Forklift question

Few years ago I purchased an old warehouse and in it was an older 87 Yale 3500 lb gasoline forklift that I just recently got up an running.
By the way I am aware of the CO2 omissions put out by a gasoline engine and with the doors open and fans running, the place is well ventilated! And my co2 detector proves it! <---- just thought I'd go ahead and nip those comments in the bud...😁
The lift seems to run fine and work good except foaming hydraulic fluid bubbles up out of the fill cap. I've put 5 gallons of hydraulic fluid it.
but it still foams out. To my understanding which I could be totally wrong, is that it will only foams when it's low on fluid, because the hydraulic pump is sucking air creating foamy bubbles which displaces the hydraulic fluid causing it to bubble out.. Now if I overfill, it will just over flow clear normal hydraulic fluid.. right? Or am I wrong? Or is there another reason the hydraulic fluid would get foamy? Or is it low on fluid? I would think 5 gallons
should top it off pretty good..
I appreciate any suggestions,
thanks,
Patrick
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Old 01-03-2019, 10:48 PM
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I have very limited knowledge of hydraulics but on my bobcat every time I have a hose blow the tank gets a little frothy. If you keep having to add fluid you really need to find the leak and fix it. It’s sucking air in from somewhere.
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Old 01-03-2019, 11:02 PM
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You might have some H2O contamination.
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Old 01-04-2019, 02:56 AM
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Originally Posted by TrueGrain View Post
By the way I am aware of the CO2 omissions put out by a gasoline engine and with the doors open and fans running, the place is well ventilated! And my co2 detector proves it! <---- just thought I'd go ahead and nip those comments in the bud...😁
You need a new CO2 detector. It should be going off constantly since normal air is .04% CO2. Why do you have one? I would just toss it and go get a CO detector, that stuff will kill you.


Seriously, check hydraulic hoses and fittings. The pump pushes and sucks fluid. If there's a leak on the suction side air will get it.
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Old 01-04-2019, 03:08 AM
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You have a dry hose leak most likely be very carful to find it tilt the forks back lift under load and watch for the puddle. Might take a while but you will find the wet hose replace bleed n good to go
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Old 01-04-2019, 04:16 AM
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Suction hose from tank to pump . You are pulling air
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Old 01-04-2019, 04:53 AM
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Originally Posted by fireisland1 View Post
Suction hose from tank to pump . You are pulling air
this would be my guess. Could also be collapsing or clogged.
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Old 01-04-2019, 04:54 AM
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Can you pull an oil sample from the hydraulic tank to see if it is contaminated. If you are that low on fluid it has a leak, most common leak on a forklift is the lift cylinder in the mast. If the leak is bad they are a pita to fix.
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Old 01-04-2019, 05:51 AM
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Originally Posted by savage View Post
You might have some H2O contamination.
This would be my guess.
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Old 01-04-2019, 05:56 AM
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Originally Posted by autobaun70 View Post


this would be my guess. Could also be collapsing or clogged.
ditto the foam is from an air leak on the suction side. It could be in the pump itself. BTW foam greatly reduces the force transmission capability of hydraulic fluid.
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Old 01-04-2019, 06:09 AM
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If there's a filter/strainer on the suction side, ensure it's tight/clean.
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Old 01-04-2019, 06:27 AM
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Originally Posted by AfterHoursNLCT View Post
If there's a filter/strainer on the suction side, ensure it's tight/clean.

I have had foaming issues also, and it always leads to a dirty filter or strainer, drain fluid, clean strainer in trans, change filter,

seeing the machine sat for a while the sump may be dirty and clogging the internal stainer
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Old 01-04-2019, 06:32 AM
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OP, if you have the exact model of the lift and preferably serial number I may be able to dig you up a service manual. Look for the serial # plate, and the capacity tag. Sometimes they are one in the same, sometimes they arenít. I have an archive of several hundred lift manuals from my time in the business.
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Old 01-04-2019, 07:10 AM
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87 forklift that hasn't been run in years. Do yourself a favor, and replace all of the hydraulic hoses. Fill, and bleed the system.
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Old 01-04-2019, 03:21 PM
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Originally Posted by autobaun70 View Post
OP, if you have the exact model of the lift and preferably serial number I may be able to dig you up a service manual. Look for the serial # plate, and the capacity tag. Sometimes they are one in the same, sometimes they arenít. I have an archive of several hundred lift manuals from my time in the business.
I'm not 100% sure of exactly what it is other than a Yale. I looked at numerous pictures online and the ones that come closest are 1985-1988ish.
someone painted this thing at one time and all the plates are unreadable.. 😕
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Old 01-04-2019, 03:24 PM
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Thanks for all the help guys! This is what makes THT so awesome!
I think everything on this forklift leaks slightly but nothing crazy.
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Old 01-04-2019, 04:31 PM
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Hit the two plates circled with some steel wool. Info should be stamped/engraved into them. Donít try to remove them first. Likely rivers and adhesive holding them on. If you try to take them off they will rip in half most of the time.

on the older side of what I have info on, but Iíll give it a shot. Shoot me a pm when you post to insure I see it if you can
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