Search found 272 matches

by Gard
Thu Jan 23, 2020 9:47 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

Its an interesting mystery to me as to what is not working in there. I know I would have a hard time giving up on the original system but I do not have any one tractor that I really need on the farm. I can understand the need to get it working one way or another (external pump) but its kind of a sha...
by Gard
Tue Jan 21, 2020 5:46 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

I agree it is not a variable displacement pump but based on the description in the manual copied below, I still think the bottom bush needs to be free to move in pump bore. Also I think the bushes need to be thick enough so the O-ring is compressed and sealed when the cover is bolted in place. If th...
by Gard
Mon Jan 20, 2020 1:47 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

I think what you are seeing is consistent with a pump that is unable to put out enough pressure to overcome the spring on the non return valve shown at 4 in origional diagram or O in second diagram. If I understand correctly you only get flow in the blue path when both valves are raised. Another les...
by Gard
Mon Jan 20, 2020 3:17 am
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

As stated earlier I also wonder what was the original fault that someone disassembled it (and then put together wrong). I do not know what inspection measurements are for the gears and bushings. One thing in the schematic drawing above is the left one of the 3 way valves that feeds the lift cylinder...
by Gard
Wed Jan 15, 2020 1:24 am
Forum: DBTC Forum
Topic: Cropmaster petrol to diesel
Replies: 18
Views: 6013

Re: Cropmaster petrol to diesel

I have parts lists for a 900, large sections are broken out for the different fuel types, diesel, TVO and gasoline. I think the 900 engine was similar or the same as the cropmaster engines but do not know for sure. It would not be too hard to look up part numbers between the gas and diesel engines. ...
by Gard
Sun Jan 12, 2020 12:32 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

Congratulations on sorting out the pump problem, in hindsight it is clear from the exploded parts diagram that the drive is on the right. I always tend to put things back the way they were, I think in the future I will also check the parts diagram as they are going together! You never know who was i...
by Gard
Tue Jan 07, 2020 2:00 pm
Forum: DBTC Forum
Topic: flushing out transmission/Hydraulics
Replies: 8
Views: 310

Re: flushing out transmission/Hydraulics

I also had good luck with the diesel flush. The other thing my owners manual suggests is drain oil when hot, and let it set in a large container. Allow time for the crap to settle to the bottom, the clean oil on top can be carefully decanted and put back in tractor and discard the bottom gallon or s...
by Gard
Mon Jan 06, 2020 11:36 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 39
Views: 1347

Re: DB 990A Implematic Hydraulics Not Working

I looked at my 990 implematic and found the "grub screw" part #3 on the Case IH parts page is a 5/16 BSF bolt, 1.5" long that appears to be threaded full length. The head of the bolt bears on the plunger part #6. There is a lock nut on the front side of the lever. I looked on the brittishfasteners.c...
by Gard
Sun Jan 05, 2020 11:49 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 39
Views: 1347

Re: DB 990A Implematic Hydraulics Not Working

I would be surprised to find BSF whitworth bolts or wrenches at the local hardware store but are easy to find on the internet, in the US, I have had good luck with britishfastners.com
by Gard
Sat Jan 04, 2020 9:18 pm
Forum: DBTC Forum
Topic: 885 retard screw
Replies: 15
Views: 450

Re: 885 retard screw

That looks awesome, nice job
by Gard
Tue Dec 31, 2019 5:26 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 96
Views: 2462

Re: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?

I don't know if your pump is the same as mine but I had bushings in the bottom (under the gears) that needed to be removed, there were Orings under the bushings that needed replacement and these bushings need to move somewhat vertically in the pump housing. I think the link should bring you there. I...
by Gard
Tue Dec 24, 2019 2:41 pm
Forum: DBTC Forum
Topic: Crank scroll seal
Replies: 10
Views: 432

Re: Crank scroll seal

On some engines the crankcase is vented to the intake manifold, this will create a small negative pressure (vacuum) in the crankcase when everything is working correctly. As Ollek states, when the the motor gets older, and rings worn, there will be enough blow by of the rings so the there can be a p...
by Gard
Fri Dec 20, 2019 2:07 pm
Forum: DBTC Forum
Topic: Reduction unit Special C spanner
Replies: 8
Views: 466

Re: Reduction unit Special C spanner

cobbadog, nice job on the pullers. To answer the original question, I measured the spanner I made for disassembling the final drives on a 990 implematic, it looks to be 4" diameter. I cut it from 7/16 steel plate with a torch and cleaned it up with grinder, not as pretty as the purchased one but wor...
by Gard
Mon Dec 16, 2019 11:44 pm
Forum: DBTC Forum
Topic: Voltage Regulator / Dynamo
Replies: 16
Views: 614

Re: Voltage Regulator / Dynamo

philedge, thanks for the additional info, This is different from the manual I have and may be more appropriate for someone with a selectomaatic tractor.
by Gard
Mon Dec 16, 2019 2:29 pm
Forum: DBTC Forum
Topic: Voltage Regulator / Dynamo
Replies: 16
Views: 614

Re: Voltage Regulator / Dynamo

In my case it was the electrical points being corroded and worn out on the old unit, The rivits needed to be drilled out to access the interior. I would not be too surprised if the new unit needed to be adjusted, I think the paint on the screws may be more about anti-vibration than tamper proof. Cer...