MikeOConnor
Silver Member
- Joined
- Dec 16, 2002
- Messages
- 170
- Location
- Western Wisconsin
- Tractor
- Two Power-Trac 1850s (preferred for mowing and grapple-bucket clearing type work on really steep hills). Kubota M680 for snowblowing, grading, bucket.
Hi all,
Remember my "1850 hydraulic pressure pulsates" puzzler a while back? Here's the link to the thread:
http://www.tractorbynet.com/forums/power-trac/313875-1850-hydraulic-pressure-pulsates-any.html
The semi-OK cure was the replacement of the brake-tender and charging valves, but things still weren't quite right. The pulsating was fixed, but the draft control that holds up the mower deck, and the seat-tilting piston, were operating at really low pressure after that. I limped along for a while but decided to start working on getting that fixed too.
The culprit of (I think) all of these problems has finally been revealed. An "old version" of the draft-control valve, which according to Terry, caused them all kinds of headaches. Replacing mine with a new one has:
- fixed the draft-control -- it's now working better than it has in years
- fixed the tilt seat -- it's now working better than it has in years
- cured a miner, but persistent, engine-overheating problem that's been with me for years
I think this rascal may have also been:
- the cause of repeated replacements of blown-seal charging-valves over the years
- the actual root cause of the "pulsating" problem
So here's a picture of my replacement one -- you can tell if you have a new one by looking at this picture. If the hex head sticks up 3/4ths of an inch like the one in this picture does, you have a new-version valve. If it only sticks up about 1/4th of an inch (about as high as where the arrow is pointing) you have an old-style one and, if you have any of those weird pressure-related problems that I listed, you might want to get a new one.
It's like driving a new tractor!
Remember my "1850 hydraulic pressure pulsates" puzzler a while back? Here's the link to the thread:
http://www.tractorbynet.com/forums/power-trac/313875-1850-hydraulic-pressure-pulsates-any.html
The semi-OK cure was the replacement of the brake-tender and charging valves, but things still weren't quite right. The pulsating was fixed, but the draft control that holds up the mower deck, and the seat-tilting piston, were operating at really low pressure after that. I limped along for a while but decided to start working on getting that fixed too.
The culprit of (I think) all of these problems has finally been revealed. An "old version" of the draft-control valve, which according to Terry, caused them all kinds of headaches. Replacing mine with a new one has:
- fixed the draft-control -- it's now working better than it has in years
- fixed the tilt seat -- it's now working better than it has in years
- cured a miner, but persistent, engine-overheating problem that's been with me for years
I think this rascal may have also been:
- the cause of repeated replacements of blown-seal charging-valves over the years
- the actual root cause of the "pulsating" problem
So here's a picture of my replacement one -- you can tell if you have a new one by looking at this picture. If the hex head sticks up 3/4ths of an inch like the one in this picture does, you have a new-version valve. If it only sticks up about 1/4th of an inch (about as high as where the arrow is pointing) you have an old-style one and, if you have any of those weird pressure-related problems that I listed, you might want to get a new one.
It's like driving a new tractor!
