440 hydraulics
- GaCatskinner
- 420 crawler
- Posts: 35
- Joined: Mon Aug 31, 2015 4:00 pm
- Location: North Georgia
440 hydraulics
Mine has the hydraulic 6 way blade. Every other dozer I've ever run could lift the front of the machine up with down pressure from the blade. Is this the case with the 440? I think one of my lift cylinders is bypassing but I didn't want to tear into them if the machine wasn't capable of lifting itself up.
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
It should easily lift it's nose.May have an issue in the control valve. gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford
- GaCatskinner
- 420 crawler
- Posts: 35
- Joined: Mon Aug 31, 2015 4:00 pm
- Location: North Georgia
That's what I thought. I'm trying to decide which to tear into first. I've rebuilt tons of cylinders through the years but I don't think I've ever been in a valve. The blade lifts fine but leaks down very slowly when you let off the valve. It lowers fine but when it gets to the ground it starts bypassing instead of giving down pressure.
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
Sounds like no fluid or not enough being delivered to the lift/down pressure cylinders. I'd check the valve body for the problem. Check to see if you have good pressure on the other cylinders in both directions before tearing it apart.. gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford
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- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
- GaCatskinner
- 420 crawler
- Posts: 35
- Joined: Mon Aug 31, 2015 4:00 pm
- Location: North Georgia
- Stan Disbrow
- 350 crawler
- Posts: 2899
- Joined: Fri Jul 15, 2005 3:13 pm
- Location: Raleigh, NC
- GaCatskinner
- 420 crawler
- Posts: 35
- Joined: Mon Aug 31, 2015 4:00 pm
- Location: North Georgia
Okay the 2 problems were the detent between down pressure and float is wore out or it just doesn't have one and there is a fine line between neutral, down and float. Air in the cylinder was another problem. I got it to raise the front end up after I figured out where the right spot to hold the valve was. One thing else though is that you have to find the right spot on the valve and hold it there for a few seconds for it to start lifting.
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
Sounds like you were floating, which is a nice option but not when you're trying to dig in. gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford
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- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
Seems like something is wore or bad in your spool, causing you to have to have it in the "sweet spot" so it will raise. I could be wrong though.
I'm still trying to figure out why mine will raise the front end and hold it up, however when the blade is up in the air it can't hold itself up and will drift down.
I'm still trying to figure out why mine will raise the front end and hold it up, however when the blade is up in the air it can't hold itself up and will drift down.
Ben
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
- Stan Disbrow
- 350 crawler
- Posts: 2899
- Joined: Fri Jul 15, 2005 3:13 pm
- Location: Raleigh, NC
Hi,
Mine drifts down because the rod seals drip.
Not bad enough for me to bother replacing them yet. Maybe when it hits 60 years old (she is a 58 )....
Besides, what does one do with the used Hygard drained out of a hydrostat?
Yep. Put it into something drippy! Self-changing oil. It isn't a bug. It's a Feature!!
Stan
Edit: Hmmm. (58 ) with the right paren against the 8 turns into (58)
Mine drifts down because the rod seals drip.
Not bad enough for me to bother replacing them yet. Maybe when it hits 60 years old (she is a 58 )....
Besides, what does one do with the used Hygard drained out of a hydrostat?
Yep. Put it into something drippy! Self-changing oil. It isn't a bug. It's a Feature!!
Stan
Edit: Hmmm. (58 ) with the right paren against the 8 turns into (58)
There's No Such Thing As A Cheap Crawler!
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
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- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
Maybe that's why mine drifts down also then. My rod seals leak. One is pretty bad. I should take it off over winter. I hate the thought of hydro oil everywhere. I should've put quick connects on all the hoses like I initially wanted, then it'd be a breeze to take a cylinder/ the whole blade off.
Ben
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
Great Grandpa's 1960 440ICD 602 blade
Between SN's: 455,633 - 456,801
Currently Rebuilding/Restoring
If you do put on quick connect fittings just watch what size you put on. They are rated by gpm of flow, which is pretty low to begin with on these old girls... it could slow down you cylinder movements a little bit.whiteclipse16 wrote:Maybe that's why mine drifts down also then. My rod seals leak. One is pretty bad. I should take it off over winter. I hate the thought of hydro oil everywhere. I should've put quick connects on all the hoses like I initially wanted, then it'd be a breeze to take a cylinder/ the whole blade off.
1956 JD420, gearmatic 8a winch, custom 6 way blade and FOPS.
In the last 20 plus years, I have only had one crawler blade drift due to the valve, and I had just rebuilt the valve incorrectly. ALL others were bad cups in the cylinders. Not that it can't be, but I have never found that to be the case.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
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