Search found 2034 matches

by erkki
Sat Nov 28, 2020 3:01 pm
Forum: David Brown Tractor Forum
Topic: 885 Hydraulics Problem
Replies: 24
Views: 824

Re: 885 Hydraulics Problem

Soaking some WD 40 to the top may do the trick. Pulling out the valve chest is several hours work, so still I would keep on exercising the spool patiently.
by erkki
Fri Nov 27, 2020 2:37 pm
Forum: David Brown Tractor Forum
Topic: 885 Hydraulics Problem
Replies: 24
Views: 824

Re: 885 Hydraulics Problem

Hmmm. Th spool valve is not prone to rust solid. There can be some dirt or even rust, which prevents it sliding down by the spring pressure but usually the valve starts moving again when helped by pushing by a screwdriver when the control lever is fully back. Independent if the valve chest is on a w...
by erkki
Thu Nov 12, 2020 2:06 pm
Forum: David Brown Tractor Forum
Topic: David Brown 950 clutch problem
Replies: 21
Views: 635

Re: David Brown 950 clutch problem

If there is no grey smoke from exhaust when cranking it is obvious that the injection system needs attention. An engine does not run without fuel. After a long standstill I would not hesitate to change new filters, clean the lift pumps screen and bowl, bleed out fuel from the tank line to see if it ...
by erkki
Thu Oct 29, 2020 2:07 pm
Forum: David Brown Tractor Forum
Topic: Cropmaster Power Steering
Replies: 10
Views: 364

Re: Cropmaster Power Steering

As skyrydr2 wrote, a petrol car engine does not work on tractor even satisfactory without a governor. The governor does not have to be very complicated, what you see on a mower could be sensitive enough especially if there is room for a heavy flywheel. Diesel is much better if it is made to work by ...
by erkki
Tue Oct 20, 2020 5:34 pm
Forum: David Brown Tractor Forum
Topic: Stabilizer alternative needed.
Replies: 11
Views: 633

Re: Stabilizer alternative needed.

Where I live most tractors have telescopic stabilizers, which have rows of holes which give possibility to lock the insert with the outer tube by a pin. They are connected to the reduction side holes and to the outer quarter-point of the link arms. Broken bolts are not unknown and its known that if ...
by erkki
Tue Oct 13, 2020 1:41 pm
Forum: David Brown Tractor Forum
Topic: 880 selectamatic hydraulic by pass filter
Replies: 16
Views: 1537

Re: 880 selectamatic hydraulic by pass filter

Hmmm. Modern oils do emulgate with water. It is made in purpose to prevent liquid water collecting somewhere in the system. In the old days oils did not mix with water, so if some water was poured in, most of it could be drained out from the lowest point of the sump. A paper filter is not able to co...
by erkki
Sun Sep 06, 2020 9:33 am
Forum: David Brown Tractor Forum
Topic: 990 engine strokes
Replies: 3
Views: 414

Re: 990 engine strokes

Hmmm. I think the explanation origins from the decision to produce cylinder block also to 990 without wet sleeves. The block has identical casting with 1200 but in order to keep that 990 in the 50..60 hp class it was rather simple way to limit the power by using shorter stroke. 1200 has stronger tra...
by erkki
Tue Aug 18, 2020 5:42 pm
Forum: David Brown Tractor Forum
Topic: 880 selectomatic smokes heavily
Replies: 5
Views: 595

Re: 880 selectomatic smokes heavily

Hmmm. Are you sure that the small tap on the side of the injector pump is open? If its closed it will cause retarded injection and a lot of smoke.I have seen a tractor which suffered of smoky run all its life on a farm. The next owner turned the tap open and the problem was sorted. Unburnt fuel is g...
by erkki
Sun Jul 19, 2020 11:40 am
Forum: David Brown Tractor Forum
Topic: 780 selectormatic livedrive
Replies: 20
Views: 1578

Re: 780 selectormatic livedrive

Hmmm When the hold valve plunger is off, the oli from the lift can flow freely to the lowering speed control valve. If the lowering speed knob is turned fully open the arms lif only very light objects, especially vhen engine idling. If the knob is turned fully in, the arms will lift rather heavy obj...
by erkki
Wed Jul 15, 2020 4:42 pm
Forum: David Brown Tractor Forum
Topic: 780 selectormatic livedrive
Replies: 20
Views: 1578

Re: 780 selectormatic livedrive

Hmmm. I have discussed with a fellow who had the same symptom. In his tractor the lowering speed valve is either stuck or the previous mechanic who has dismantled the valve chest has assembled the valve plunger to the bore upside down. This upside down sound stupid but I have seen that happen. Enery...
by erkki
Thu Mar 16, 2017 9:05 am
Forum: David Brown Tractor Forum
Topic: david brown 795
Replies: 1
Views: 1162

Re: david brown 795

To get better access to the diff lock, its better to remove the flange, on which the oil seals are fitted. Use right size of bolts and a strong flat bar to the job, just in order to avoid the flange damages. To put the things back together you need a rod, slightly thinner than the drive shaft, on wh...
by erkki
Sat Mar 11, 2017 6:34 pm
Forum: David Brown Tractor Forum
Topic: 996/1390 engines
Replies: 2
Views: 1672

Re: 996/1390 engines

I have an 990 which has got the engine from a 1390. That means that swapping the engine between 1390 and 996 should be more or less a bolt-on operation. 990 has dual clutch but both stages on pedal, so I suppose my tractor has original 990 clutch assembly. I cant be sure if 1390 and 996 have interch...
by erkki
Tue Mar 07, 2017 5:46 pm
Forum: David Brown Tractor Forum
Topic: 996 driving me mad
Replies: 3
Views: 1889

Re: 996 driving me mad

I have seen one 990 (very identical fuel system with 996) which suffered of a dirt particle in the tank pipe. It did run a while but then stopped. After bleeding it did run a while again and stopped. The dirt was found after loosening the connection from tank line to the fuel line to the lift pump. ...
by erkki
Sat Mar 04, 2017 5:58 am
Forum: David Brown Tractor Forum
Topic: Older 990's with Low Remote Hydraulic Pressure?
Replies: 8
Views: 3168

Re: Older 990's with Low Remote Hydraulic Pressure?

OK. Broken/disappeared 0-ring is probably the explanation. Now, when the pump is on desk, it could be a good idea to check if it needs new gasket rings. At least Dowty has replaceable seals which can give up and weaken the pressure output. I do not know about Plessey, but I guess that it has about t...
by erkki
Fri Mar 03, 2017 6:09 am
Forum: David Brown Tractor Forum
Topic: Older 990's with Low Remote Hydraulic Pressure?
Replies: 8
Views: 3168

Re: Older 990's with Low Remote Hydraulic Pressure?

If your tractor has double acting valves on the RHS of the seat, they are independent of rear lift.

W.B.R erkki