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Old 08-09-2018, 06:03 AM   #26 (permalink)
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Most hydraulic systems run around 3000 psi. I'd usually throw a 5000psi oil filled gauge on and try that first.

If it is shot I'm sure you could either find parts for it or retrofit something else in its place. Might be a pain in the ass or pretty simple depending on how it is mounted and driven. Just try and get something that moves similar volume if you do go the retrofit route. Do you happen to have a pic of the pump and where it is mounted?
Yep, less than $20 on Amazon (plus a fitting to connect it in) and you are good to go.

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Old 08-09-2018, 06:09 AM   #27 (permalink)
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That battery hold down scares me. Wouldn't take much to lay something from the (+) terminal to ground.
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Old 08-09-2018, 09:20 AM   #28 (permalink)
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Originally Posted by billybob_81067 View Post
Most hydraulic systems run around 3000 psi. I'd usually throw a 5000psi oil filled gauge on and try that first.

If it is shot I'm sure you could either find parts for it or retrofit something else in its place. Might be a pain in the ass or pretty simple depending on how it is mounted and driven. Just try and get something that moves similar volume if you do go the retrofit route. Do you happen to have a pic of the pump and where it is mounted?
Copy, I'll get a gauge coming for it.
A couple places I've talked to said to get rid of it, it's too old, etc. but it's the perfect size for my small shop and I'm into it a little north of $1000. Anything comparable would be much larger and much much more expensive.
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Old 08-09-2018, 09:23 AM   #29 (permalink)
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Not ideal but easily hooked up to the charger now.
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That battery hold down scares me. Wouldn't take much to lay something from the (+) terminal to ground.
would it make you feel better if I put a boot over the positive "(+)" terminal?
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Old 08-12-2018, 11:48 PM   #30 (permalink)
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Pulled the control valve out with the help of my forklift mechanic buddy. No seals or places for seals in the spools, but no pitting either.
Pressure relief valve was maxed out, we are speculating that the spring is worn out.
With weight on, the forks drift down when you are trying to lift at idle but we are starting to think that's how it should be, until you throttle up?
However, it still won't lift much of anything. I have a pressure gauge to try tomorrow and he is going to see about a flow gauge from work. Letting it idle with the high pressure line feeding into a bucket it seems to have no flow issues.
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Old 08-13-2018, 01:11 AM   #31 (permalink)
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Forks should not drift down...
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Old 08-13-2018, 06:05 AM   #32 (permalink)
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Forks should not drift down...
This. Does it hold when you shut it off and/or don't move the control lever??
If not, its probably a leaking control valve. If it holds with the lever in neutral, but not when you are trying to raise it, its probably a bad pressure relief valve.

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Old 08-13-2018, 08:06 AM   #33 (permalink)
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This. Does it hold when you shut it off and/or don't move the control lever??
If not, its probably a leaking control valve. If it holds with the lever in neutral, but not when you are trying to raise it, its probably a bad pressure relief valve.

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With the levers in neutral it holds, only drifts down when trying to raise it. Feels like 300 rpm is all it needs to start raising again.
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Old 08-13-2018, 08:45 AM   #34 (permalink)
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With the levers in neutral it holds, only drifts down when trying to raise it. Feels like 300 rpm is all it needs to start raising again.
Either the relief valve spring is bad (sounds like this is the case), and/or the pump is weak...

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Old 08-13-2018, 09:26 AM   #35 (permalink)
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With the levers in neutral it holds, only drifts down when trying to raise it. Feels like 300 rpm is all it needs to start raising again.

Ok that makes more sense... They should hold in neutral.


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Either the relief valve spring is bad (sounds like this is the case), and/or the pump is weak...

Aaron Z
Try finding a spring to swap into that relief valve and make sure it doesn't have shit in it keeping it from closing. Then if that still doesn't do it pressure test the pump.
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Old 08-13-2018, 09:55 AM   #36 (permalink)
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Ok that makes more sense... They should hold in neutral.




Try finding a spring to swap into that relief valve and make sure it doesn't have shit in it keeping it from closing. Then if that still doesn't do it pressure test the pump.
We tore down the valves yesterday and cleaned them thoroughly. The adjustment for the pressure relief spring was totally maxed out so I'm inclined to think weak spring. I hope so... Pump sounds expensive.
I have a pressure gauge coming today, but wouldn't a flow meter be better in this case?
Yesterday was my first ever time really dealing with hydraulics.
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Old 08-13-2018, 03:20 PM   #37 (permalink)
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We tore down the valves yesterday and cleaned them thoroughly. The adjustment for the pressure relief spring was totally maxed out so I'm inclined to think weak spring. I hope so... Pump sounds expensive.
I have a pressure gauge coming today, but wouldn't a flow meter be better in this case?
Yesterday was my first ever time really dealing with hydraulics.
You can have flow at low pressure and still have a worn out pump. When the pressure goes up it starts bypassing internally if the pump is worn out and you get no flow or pressure.

You need both pressure and flow in order for it to work. You can have a system with 10k pressure that only flows a thimbleful of fluid and it will lift like a son of a bitch but extremely slowly. Or you can have a pump that flows well but has no pressure and you get what it sounds like you have now. Won't raise its own weight unless revved up.
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Old 08-13-2018, 10:20 PM   #38 (permalink)
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You may be able to just shim the relief valve spring (washer) to test it.

There's a good chance the pump is worn out and they were cranking the relief valve in an effort to 'fix' it.

Depending on the pump it may be easy to source one that is generic/similar that will work...
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Old 08-13-2018, 10:59 PM   #39 (permalink)
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There's a good chance the pump is worn out and they were cranking the relief valve in an effort to 'fix' it.
That's my bet...
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Old 08-15-2018, 06:39 AM   #40 (permalink)
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That's my bet...
Would it have a suction strainer in it? I've had tractors with weak hydraulic system where that was all that's wrong with it.
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Old 08-15-2018, 07:39 AM   #41 (permalink)
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Would it have a suction strainer in it? I've had tractors with weak hydraulic system where that was all that's wrong with it.
That could do it.

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