Search found 321 matches

by Gard
Fri Sep 25, 2020 3:05 pm
Forum: DBTC Forum
Topic: Ebay Tractor Seat - DB990
Replies: 6
Views: 201

Re: Ebay Tractor Seat - DB990

For some of the replacement seats on the market, you can get technical drawings from the manufacturer, either by contacting them directly or off their web site. What I did is make some cardboard templates from the drawings to check clearance. I had issues with seat height, clearance to shift levers ...
by Gard
Wed Sep 02, 2020 12:39 pm
Forum: DBTC Forum
Topic: Dash lights.
Replies: 15
Views: 631

Re: Dash lights.

Working on various vehicles over the years, in my experience weird electrical symptoms are almost always a ground fault, several ground wires are connected together then connected to frame with screw, when this screw gets loose you end up with current flowing from one system backwards in to another....
by Gard
Mon Aug 31, 2020 4:41 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 32
Views: 887

Re: 1212 dynamo charging

I have a manual that has a procedure for troubleshooting the Lucas generator and adjusting the lucas regulator. I don't remember where I downloaded it from but I can send a copy if you PM me. I do not know if the 1212 system is covered but may provide some insight.
by Gard
Mon Aug 31, 2020 4:30 pm
Forum: DBTC Forum
Topic: 995 thrust bearing
Replies: 9
Views: 317

Re: 995 thrust bearing

I think the normal position of that adjusting screw is almost all the way in, a small amount of play in the clutch cross shaft and or linkage can use up the adjustment. The screw is long to make it easy to install the external clutch pedal return spring. At least this was my observation on my 990 im...
by Gard
Sun Aug 23, 2020 2:00 pm
Forum: DBTC Forum
Topic: Gresen loader valve seals
Replies: 13
Views: 448

Re: Gresen loader valve seals

There are tables and equations available that show the recommended O ring gland dimensions and tolerances for each O-ring size. It comes down to having a recommended percent compression in one direction and extra space for expansion in the other direction. Parker O Ring is one good source, there are...
by Gard
Mon Aug 17, 2020 4:49 pm
Forum: DBTC Forum
Topic: 880 selectomatic smokes heavily
Replies: 5
Views: 358

Re: 880 selectomatic smokes heavily

My understanding is other indicators of bad rings is poor compression and blow by which causes a pressure to build up in the crankcase. Does the engine try to lift the oil filler cap when running? If you are going to get the injectors serviced, that would be a good time to check the compression. Aro...
by Gard
Mon Aug 10, 2020 4:02 pm
Forum: DBTC Forum
Topic: Hydraulic relief valve
Replies: 8
Views: 505

Re: Hydraulic relief valve

I think if you are measuring 2000 psi than the pump and pressure relief valve are both working correctly? At least that is the spec for my tractor which I suppose may be different. So, do you want to increase the relief pressure above the factory setting to lift bigger bales than the tractor was des...
by Gard
Mon Aug 03, 2020 4:01 pm
Forum: DBTC Forum
Topic: 885N 3-point lift question
Replies: 3
Views: 282

Re: 885N 3-point lift question

I have found that TCU works well sometimes when using a mower. Other times (especially for rough terrain) the height control is better. Get the manual and then go try different things.
by Gard
Mon Aug 03, 2020 3:44 pm
Forum: DBTC Forum
Topic: 990 engine knock
Replies: 12
Views: 526

Re: 990 engine knock

db2d, can you describe the basic crankshaft test a little more. Is this without removing the oil pan? How much movement is normal or acceptable? Thanks
by Gard
Sun Aug 02, 2020 4:14 pm
Forum: DBTC Forum
Topic: 990 PTO power
Replies: 11
Views: 529

Re: 990 PTO power

Most equipment made today uses the 540 RPM PTO. If I am cutting a field with the brush hog that is not very tall I often use high PTO with low engine RPM. On tall fields I switch to low PTO and high engine RPM. I have an old Howard rototiller that can be used at either 1000 or 540 RPM depending on s...
by Gard
Sat Aug 01, 2020 12:51 pm
Forum: DBTC Forum
Topic: 990 engine knock
Replies: 12
Views: 526

Re: 990 engine knock

I think oil pressure can be another indicator of bearing problems, pressure will be low if the bearings are too loose.
by Gard
Thu Jul 30, 2020 1:33 pm
Forum: DBTC Forum
Topic: Selectamatic 880A second stage clutch won't depress
Replies: 8
Views: 438

Re: Selectamatic 880A second stage clutch won't depress

interesting, I have a 900 that will not disengage the PTO clutch but it sort of feels like the mechanism is engaging a 2nd stage spring. I assumed the plate is stuck or rusted to clutch pads and I am awaiting a good time to split it and investigate. The tractor drives OK with the main clutch and ped...
by Gard
Wed Jul 29, 2020 7:30 pm
Forum: DBTC Forum
Topic: David Brown 4600 power steering cylinder.
Replies: 14
Views: 795

Re: David Brown 4600 power steering cylinder.

Do you know what is wrong with the basket of parts you have? Around me there are a couple of shops that specialize in repairing hydraulics I think they could repair, straighten or rebuild or make from scratch most parts. It took a bit of calling to find a shop that has the machine shop and hydraulic...
by Gard
Sat Jul 25, 2020 2:03 am
Forum: DBTC Forum
Topic: Erratic Power Loss on hills - 990 Selectamatic
Replies: 10
Views: 558

Re: Erratic Power Loss on hills - 990 Selectamatic

In my case I had similar thing, sometimes it would stall and hard to restart. Other times it would run like a raped ape. The problem was 50 something years of crap in the tank that would occasionally plug up the line to the lift pump. I removed the line at the lift pump and hit it with compressed ai...
by Gard
Wed Jul 22, 2020 11:41 pm
Forum: DBTC Forum
Topic: David Brown 4600 power steering cylinder.
Replies: 14
Views: 795

Re: David Brown 4600 power steering cylinder.

Welcome to the forum. I have what looks like the same cylinder on my 990. When I first got the tractor I had to disassemble and rebuild it with new seals and perhaps a new part or 2, it has worked fine for the last 25 years. A hydraulic shop may be able to fix yours if you want to go that route. I d...