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Topic Review (Newest First)
08-15-2018 07:39 AM
aczlan
Quote:
Originally Posted by Tizken View Post
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.

Aaron Z
08-15-2018 06:39 AM
Tizken
Quote:
Originally Posted by billybob_81067 View Post
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.
08-13-2018 10:59 PM
billybob_81067
Quote:
Originally Posted by DirtyComanche View Post

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...
08-13-2018 10:20 PM
DirtyComanche 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...
08-13-2018 03:20 PM
billybob_81067
Quote:
Originally Posted by sammyg View Post
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.
08-13-2018 09:55 AM
sammyg
Quote:
Originally Posted by billybob_81067 View Post
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.
08-13-2018 09:26 AM
billybob_81067
Quote:
Originally Posted by sammyg View Post
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.


Quote:
Originally Posted by aczlan View Post
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.
08-13-2018 08:45 AM
aczlan
Quote:
Originally Posted by sammyg View Post
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...

Aaron Z
08-13-2018 08:06 AM
sammyg
Quote:
Originally Posted by aczlan View Post
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.

Aaron Z
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.
08-13-2018 06:05 AM
aczlan
Quote:
Originally Posted by DirtyComanche View Post
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.

Aaron Z
08-13-2018 01:11 AM
DirtyComanche Forks should not drift down...
08-12-2018 11:48 PM
sammyg 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.
08-09-2018 09:23 AM
sammyg
Quote:
Originally Posted by sammyg View Post
Not ideal but easily hooked up to the charger now.
Quote:
Originally Posted by madisonjam85 View Post
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?
08-09-2018 09:20 AM
sammyg
Quote:
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.
08-09-2018 06:09 AM
madisonjam85 That battery hold down scares me. Wouldn't take much to lay something from the (+) terminal to ground.
08-09-2018 06:03 AM
aczlan
Quote:
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?
Yep, less than $20 on Amazon (plus a fitting to connect it in) and you are good to go.

Aaron Z
08-09-2018 12:20 AM
billybob_81067
Quote:
Originally Posted by sammyg View Post
That's kind of my next step, honestly I have no idea what sort of gauge to even go with, or what kind or pressures it should be running at. I have a friend who is a forklift mechanic who said he'll swing by this weekend and take a look at it. My concern is if it is the pump, can I retrofit something else in it's place?
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?
08-09-2018 12:01 AM
sammyg
Quote:
Originally Posted by billybob_81067 View Post
I'd bet pump is getting weak. Any way you can throw a gauge on it to pressure test it?
That's kind of my next step, honestly I have no idea what sort of gauge to even go with, or what kind or pressures it should be running at. I have a friend who is a forklift mechanic who said he'll swing by this weekend and take a look at it. My concern is if it is the pump, can I retrofit something else in it's place?
08-08-2018 11:34 PM
billybob_81067
Quote:
Originally Posted by sammyg View Post
Re assembled the ram, stripped and painted it, re installed, which was dang near a pain... Fueled it up again, got it running, had high hopes at first. It lifted the first 4 inches right off idle and that was it, then back to the same old thing having to throttle it up to get it to move, but this time, the shaft was staying dry. It still won't lift much more than it's own mast.
So, now I'm not sure where to go from here. Maybe the pump is going bad? Maybe one of the lines is clogged? It doesn't seem to have a filter anywhere.
I'd bet pump is getting weak. Any way you can throw a gauge on it to pressure test it?
08-08-2018 11:24 PM
sammyg Re assembled the ram, stripped and painted it, re installed, which was dang near a pain... Fueled it up again, got it running, had high hopes at first. It lifted the first 4 inches right off idle and that was it, then back to the same old thing having to throttle it up to get it to move, but this time, the shaft was staying dry. It still won't lift much more than it's own mast.
So, now I'm not sure where to go from here. Maybe the pump is going bad? Maybe one of the lines is clogged? It doesn't seem to have a filter anywhere.
08-04-2018 07:23 PM
Azzy2000 Cool project!

I love that it is that old and still putt putting along
08-02-2018 02:04 PM
sammyg Well, in the on going saga of this old lift, the seals are for the newer style cylinder. So... Back to the beginning. I contacted the o ring store above and they should be able to get me the correct chevron style packing.
The bore is slightly rusty and pitted but only at the top where the dead head bump stop is located, the seals shouldn't contact that area I don't think. I'll measure when putting it back together, likely hone it a little just in that area, and if its bad enough I'll just make a longer bump. Where there's a will there's a way right?
When I disassembled there was a LOT of fluid on top of the piston. I'm guessing that's not supposed to be the case
By the way. These things make a huge mess when pulling them apart
07-16-2018 07:04 PM
sammyg Thanks to the internet I was able to track down a "close enough" owners manual and parts book. I was also able to find the extinct parts.
06-29-2018 07:07 AM
rockota
Quote:
Originally Posted by sammyg View Post
Yeah, that's.... Too... Bad....
06-29-2018 02:01 AM
DirtyComanche Cool projected. Sub'd for updates.
This thread has more than 25 replies. Click here to review the whole thread.

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