Search found 2098 matches

by db2d
Fri Dec 06, 2019 11:40 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

Some form of heating may be necessary, or a warm environment to warm the oil, and thaw any water that maybe present.
by db2d
Fri Dec 06, 2019 11:14 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 24
Views: 330

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

1965 880 threads are mostly UNC ( Unified National Course).
by db2d
Fri Dec 06, 2019 11:08 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

The easiest method to fill the gearbox with oil is to remove the cover on top of the PTO unit and simply pour it in.
by db2d
Fri Dec 06, 2019 9:45 pm
Forum: DBTC Forum
Topic: 1965 David Brown 880UE Implematic, how to prime transmission hydraulic pump?
Replies: 24
Views: 330

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

The threads on DB tractors are predominantly BSF ( British Standard Fine) or Unified ( UNF/UNC ).
The bolts securing the control valve onto the aluminium pump are 5/16 BSF. 1/4 Whitworth spanner size.
by db2d
Fri Dec 06, 2019 2:15 pm
Forum: DBTC Forum
Topic: 880A Selectamatic information request
Replies: 17
Views: 1677

Re: 880A Selectamatic information request

Cropmasters and 30C series one tractors rear lights were positioned either side of the double seat with a provision for illuminating the registration plate. The single armoured cable was secured with small P shaped metal clips about 1/2” wide and 1/8” screws and nuts. The cable for the plough lamp s...
by db2d
Fri Dec 06, 2019 8:55 am
Forum: DBTC Forum
Topic: 880A Selectamatic information request
Replies: 17
Views: 1677

Re: 880A Selectamatic information request

Replacement mudguards do not have holes for the wiring, these holes have to be drilled. 30C series one tractors did not have rear lights on the mudguards other than the plough lamp. Tubing was not used but armoured cable secured with clips, was.
by db2d
Thu Dec 05, 2019 10:44 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

Is the lever on the right hand side of the ramshaft out towards the mudguard and down ? Remove the cover and check the operation of the trip mechanism by operating the lever by lifting the lever until it connects with the operating pivot and then up further to trip the linkage. Do this a few times t...
by db2d
Thu Dec 05, 2019 8:16 am
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

Extending the cable with the control lever in the lowering position will move a spool valve and the snow blower should lower. You can do this without fitting the cable onto the top link.
by db2d
Thu Dec 05, 2019 8:08 am
Forum: DBTC Forum
Topic: Drawbar
Replies: 7
Views: 201

Re: Drawbar

Welding drawbars can be dangerous because afterwards they can suddenly snap.
by db2d
Wed Dec 04, 2019 9:14 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

As a quick fix to lower the linkage, fit the sensing cable onto the top link but be careful whilst doing this as the snow blower may drop suddenly. Fit the cable with the control lever fully back in the raise position and then move it forward to lower.
by db2d
Wed Dec 04, 2019 8:33 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

The valve does divert the oil either to the ram cylinder or loader. It is not a spool valve and works like a tap, the knob has to be turned either fully in or out. The valve will not divert the oil without the nut in the centre of the knob being in place. It is possible that there is a problem with ...
by db2d
Wed Dec 04, 2019 7:15 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Working

It is extremely unlikely that a blockage in the ram cylinder is the cause of the problem on your tractor. From the explanations you have given I suspect a valve is closed and not allowing oil to and from the ram cylinder. To operate the system the two way valve has to be closed to external services ...
by db2d
Wed Dec 04, 2019 6:25 pm
Forum: DBTC Forum
Topic: DB 990A Implematic Hydraulics Not Working
Replies: 25
Views: 355

Re: DB 990A Implematic Hydraulics Not Wor

There is no downward pressure pressure on the rear linkage— lift and hold only.
The linkage is free t
The filters and pumping mechanism will not stop the lift from lowering.
by db2d
Mon Dec 02, 2019 8:49 am
Forum: DBTC Forum
Topic: Leaky fuel pipe at injector.
Replies: 3
Views: 144

Re: Leaky fuel pipe at injector.

New steel compression olives are readily available.
Cut off the damaged nipple and fit a new olive. Pass fuel through the pipe before connecting to the injector to be certain no foreign material enters the injector.
by db2d
Sat Nov 30, 2019 9:42 pm
Forum: DBTC Forum
Topic: 990 Implematic
Replies: 15
Views: 482

Re: 990 Implematic

The cross boxes on the pre-Implematic tractors had to be drilled in order to fit the three way valve. The Implematic tractors had the holes drilled during production. Later Implematics without cross boxes had a different type of valve.