Hi, my uncle has a dexta that probably has clocked over 15000 hours. It has gotten no other love than oil changes and has worked flawlessly, but this spring something has happened to its hydraulics.
With light load on the lifters, it only lifts halway up(haven´t tried taking the load off) The movement of the lifters is smooth, but I have to move the main control lever all the way to its endpoint several times to make it go this high, somtimes it stops even at a lower point. The lifters stay up and doesnt sag.
I drained some oil, because there was to much oil in the reservoir, and the color was clear.
I´m planning to take off the hydralic cover and take a look, but what should I look for?
Hydraulics lifters stops halfway up.
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volvobaggen
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Re: Hydraulics lifters stops halfway up.
Welcome to the board.
Things to try to help identify your problem:
1. Is the lift in Draft or Position Control? Little lever on the side of the lift. Up for Position, Down for Draft. In Position Control, start with the control lever at the bottom of the quadrant, with engine running, and move the lever slowly up the quadrant, noting where the arms start to lift. They should start to lift within 25mm of the bottom stop.
2. Select Draft Control, lever down, move the control lever to the top of the quadrant. The lift arms should raise. When they stop raising, push the Position Control/Draft Control lever towards the rear. Lift arms should raise further.
These two tests will help you identify the problem. If in test 1 the lift does not start to raise within 25 mm, the internal settings are not correct or the Position Control follower pin is worn. If in test 2 pushing backwards on the selector causes the lift to raise, the Position Control follower pin that moves on a cam on the lift arms, is worn.
Neither of these problems is a big job, do a search on the board for the dimensions of the Position Control pin and check Hydraulics on the Wiki (passwords "fordsontractorpages" and "dotty") for the lift settings.
Things to try to help identify your problem:
1. Is the lift in Draft or Position Control? Little lever on the side of the lift. Up for Position, Down for Draft. In Position Control, start with the control lever at the bottom of the quadrant, with engine running, and move the lever slowly up the quadrant, noting where the arms start to lift. They should start to lift within 25mm of the bottom stop.
2. Select Draft Control, lever down, move the control lever to the top of the quadrant. The lift arms should raise. When they stop raising, push the Position Control/Draft Control lever towards the rear. Lift arms should raise further.
These two tests will help you identify the problem. If in test 1 the lift does not start to raise within 25 mm, the internal settings are not correct or the Position Control follower pin is worn. If in test 2 pushing backwards on the selector causes the lift to raise, the Position Control follower pin that moves on a cam on the lift arms, is worn.
Neither of these problems is a big job, do a search on the board for the dimensions of the Position Control pin and check Hydraulics on the Wiki (passwords "fordsontractorpages" and "dotty") for the lift settings.
Fordson Tractor Pages, now officially linked to: Fordson Tractor Club of Australia, Ford and Fordson Association and Blue Force.
Brian
Brian
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volvobaggen
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Re: Hydraulics lifters stops halfway up.
Thanks for fast reply, I will go out and start testing.
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volvobaggen
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Re: Hydraulics lifters stops halfway up.
So here are the test results:
In position control: The lift didnt start moving until the control lever was moved 3/5 through the quadrant. If the control lever was moved slow and gently, the lift went a lot higher than if it was moved fast.
In draft control: Moved the control lever through the whole quadrant, the lift didnt move at all. I tried to force the postion/draft control lever towards the rear of the tractor, but I could not move it beyond 6 o´clock.
Position control follower pin issue?
A little off topic funny story: Talked to my uncle today, and this tractor has taken a lot of beating. There is no cap on the vertical exhaust outlet so a lot of rain and snow found its way into the exhaust manifold this winter. He didnt realise that a chunk of ice was blocking the exhaust when he tried to start it. The engine was sounding a bit dead as he tried to start it, so he gave the engine treatment with starting fluid. The engine started with a bang and a chunk of ice was launched out the exhaust.
In position control: The lift didnt start moving until the control lever was moved 3/5 through the quadrant. If the control lever was moved slow and gently, the lift went a lot higher than if it was moved fast.
In draft control: Moved the control lever through the whole quadrant, the lift didnt move at all. I tried to force the postion/draft control lever towards the rear of the tractor, but I could not move it beyond 6 o´clock.
Position control follower pin issue?
A little off topic funny story: Talked to my uncle today, and this tractor has taken a lot of beating. There is no cap on the vertical exhaust outlet so a lot of rain and snow found its way into the exhaust manifold this winter. He didnt realise that a chunk of ice was blocking the exhaust when he tried to start it. The engine was sounding a bit dead as he tried to start it, so he gave the engine treatment with starting fluid. The engine started with a bang and a chunk of ice was launched out the exhaust.
Re: Hydraulics lifters stops halfway up.
Yes, you need to remove and replace the Position control pin and reset the adjustments.
Fordson Tractor Pages, now officially linked to: Fordson Tractor Club of Australia, Ford and Fordson Association and Blue Force.
Brian
Brian
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volvobaggen
- Not Quite Blue Yet
- Posts: 7
- Joined: Mon Jun 27, 2011 3:29 pm
- Location: Norway
Re: Hydraulics lifters stops halfway up.
The lift now works, yay 
After a lot of trouble using metric pipes on the housing bolts, I got hold of a proper size english imperial unit spanner. After that everyting got a lot easier.
I was shocked when uncovered the hydraulics housing and peeked down. There was a lot of sand and dirt deposits in the rear of the hydraulics box where the lift arms enters the housing. Also sediments was present in the bottom of the reservoir. Cleaned it all out with diesel and rags and wondered why the filter and pump was not jammed/broken down. I had an extra dexta hydraulics cover from a scrapped dexta that I ended up using. I inspected the position control pin on both the hydraulic covers, and in both instances 30-40% of the diameter was worn down. Compared to my spare hydraulics cover, the old one had a feeling of beeing "worn down" when moving the control lever(feeling of slack/inertia). In addition the position control rod was a bit out of position where it contacs the control valve actuating lever. Im going to dismantle the hydraulics cover when I get time, but I think there might be more work to it than just making the proper adjustments. Even with a worn position control rod, the hydraulics works perfectly (I admit beeing sloppy, but I didnt have the time or proper enviroment to disassemble)
The old dexta will still be working the "fields"(just small patches of dirt and rock) here in Norway, and thank you for helping me Brian.
After a lot of trouble using metric pipes on the housing bolts, I got hold of a proper size english imperial unit spanner. After that everyting got a lot easier.
I was shocked when uncovered the hydraulics housing and peeked down. There was a lot of sand and dirt deposits in the rear of the hydraulics box where the lift arms enters the housing. Also sediments was present in the bottom of the reservoir. Cleaned it all out with diesel and rags and wondered why the filter and pump was not jammed/broken down. I had an extra dexta hydraulics cover from a scrapped dexta that I ended up using. I inspected the position control pin on both the hydraulic covers, and in both instances 30-40% of the diameter was worn down. Compared to my spare hydraulics cover, the old one had a feeling of beeing "worn down" when moving the control lever(feeling of slack/inertia). In addition the position control rod was a bit out of position where it contacs the control valve actuating lever. Im going to dismantle the hydraulics cover when I get time, but I think there might be more work to it than just making the proper adjustments. Even with a worn position control rod, the hydraulics works perfectly (I admit beeing sloppy, but I didnt have the time or proper enviroment to disassemble)
The old dexta will still be working the "fields"(just small patches of dirt and rock) here in Norway, and thank you for helping me Brian.