Search found 3603 matches

by ollek
Sun Feb 17, 2019 10:48 am
Forum: DBTC Forum
Topic: Hydraulic variable control valve
Replies: 2
Views: 84

Re: Hydraulic variable control valve

No David Brown tractors hydraulics have adjustments for variable flow. The only way to increase and/or decrees the hydraulic output is to change the engine revs. You can, however, half the flow to the Cessna valve if your tractor has a tandem pump. You can, with a lever, select both pump output to t...
by ollek
Thu Feb 14, 2019 2:22 pm
Forum: DBTC Forum
Topic: Drain 770 Tank
Replies: 7
Views: 216

Re: Drain 770 Tank

The 880 Implemtic had the pipe fitted to the bottom of the tank and had a shut off valve. All Selectamatic models had the pipe fitted the front top of the tank. The 770 is a Selctamatic. There is no shut off valve in a Selectamatic and there is no 770 Implematic.
by ollek
Tue Feb 12, 2019 5:35 am
Forum: DBTC Forum
Topic: Rear Wheel sizes
Replies: 2
Views: 147

Re: Rear Wheel sizes

The following is a link to specs for 880 Selectamatic https://dbtc.co.uk/index.php/880-selectamatic
by ollek
Mon Feb 11, 2019 5:30 pm
Forum: DBTC Forum
Topic: Lift pump dropping fuel
Replies: 8
Views: 226

Re: Lift pump dropping fuel

Leaking lift pump valves will not let any air into the system.
by ollek
Mon Feb 11, 2019 4:08 pm
Forum: DBTC Forum
Topic: Lift pump dropping fuel
Replies: 8
Views: 226

Re: Lift pump dropping fuel

The valve on the intake side of the lift pump should keep the fuel in the bowl, even if the pump intake pipe is loosened. Dirt from the fuel tank can get its way to the lift pump and get jammed in the intake valve, making the fuel leaking back into the tank.
by ollek
Sat Feb 02, 2019 4:57 pm
Forum: DBTC Forum
Topic: 1972 995 gearbox problem
Replies: 8
Views: 530

Re: 1972 995 gearbox problem

Sounds like the gear box is locking up when you select High gear. There is a possibility that the High/Low gear has split into two half's after the circlip holding the two gears together have failed. If this is the case, then you will need a new (or used) High/Low gear. It is usually not possible to...
by ollek
Sat Feb 02, 2019 1:23 pm
Forum: DBTC Forum
Topic: DB770 (Livedrive) cylinder head valves
Replies: 6
Views: 217

Re: DB770 (Livedrive) cylinder head valves

Why cant you do as db2d have suggested: "Contact davidbrownparts.com They have the valves etc".
by ollek
Sat Feb 02, 2019 10:52 am
Forum: DBTC Forum
Topic: DB770 (Livedrive) cylinder head valves
Replies: 6
Views: 217

Re: DB770 (Livedrive) cylinder head valves

The exhaust valve caps must not be used any longer. This was informed by David Brown decades ago in a service bulletin. Do not fit the caps and adjust all valves to 0,25 mm. There is no change to any other parts in relation to the valves. Please see ref 26 in the following link https://partstore.cas...
by ollek
Tue Jan 29, 2019 11:39 am
Forum: DBTC Forum
Topic: 990 3 way take off valve
Replies: 5
Views: 286

Re: 990 3 way take off valve

The following is a link to the parts catalogue page ´for the 3-way valve https://partstore.caseih.com/us/parts-s ... 85ar351388
by ollek
Tue Jan 29, 2019 8:31 am
Forum: DBTC Forum
Topic: 990 3 way take off valve
Replies: 5
Views: 286

Re: 990 3 way take off valve

If you have a 3-way valve with taps. please remember the following. You must have only one tap open and the other two closed. For example, If you want to use the 3-point hitch then you have to have the L-tap open and both the other taps (1 and 2) completely closed. The constant 50 mm lift and loweri...
by ollek
Fri Jan 25, 2019 10:16 am
Forum: DBTC Forum
Topic: 780 selectamatic loader spool challenge...
Replies: 23
Views: 926

Re: 780 selectamatic loader spool challenge...

The spool for the boom have to be single acting and the spool for the bucket must be double acting. Any other spool configurations will not work correctly. It looks like both spools are double acting, as one outlet is plugged. Plugging a outlet from a double acting spool will put the pump under stra...
by ollek
Fri Jan 25, 2019 10:11 am
Forum: DBTC Forum
Topic: Voltage Stabiliser - Posotive or Negative Earth (885)
Replies: 9
Views: 294

Re: Voltage Stabiliser - Posotive or Negative Earth (885)

A 885 has negative earth and the battery cables must not be fitted in any other way. The positive earth in a David Brown tractor was discontinued at the end of the 1950:s and all DB:s after that has negative earth. The voltage stabiliser is there only to keep the voltage to the fuel gauge stable. Th...
by ollek
Wed Jan 23, 2019 7:00 am
Forum: DBTC Forum
Topic: 990 block to chassis oring size
Replies: 6
Views: 302

Re: 990 block to chassis oring size

I would recommend to contact david brown spares as suggested. Just fitting a "bigger" O-ring without knowing the correct diameter, can result in leaks and other problems.
by ollek
Tue Jan 22, 2019 8:03 am
Forum: DBTC Forum
Topic: 990 block to chassis oring size
Replies: 6
Views: 302

Re: 990 block to chassis oring size

1/16 of a inch is 1,587 mm. 3/16 of an inch is therefor 3x1,587=4,761 mm. For quick calculations you can use the following easy to remember figures: 1/16 of an inch equals 1,6 mm.
by ollek
Mon Jan 21, 2019 6:13 pm
Forum: DBTC Forum
Topic: 780 selectamatic loader spool challenge...
Replies: 23
Views: 926

Re: 780 selectamatic loader spool challenge...

Is your loader equipped with double acting cylinders at the boom and the bucket? If so, then you have missed out the second houses to the cylinders. Double acting cylinders needs two hoses from the loader spool valve and it looks that you have only one hose for the boom lift and one for the bucket c...