David brown 990 selectamatic hydraulics

Moderators: Segrie61admin. David Brown Tractor Forum Skip to content. Quick links. Adding external hydraulics to a Selectamatic The place to discuss all matters relating to David Brown Tractors. You will need to register your user name before you can post. If you have already registered could you please make sure that your location details have been completed.

County if within the U. Location details helps other members if you need spares, technical advice, or the nearest practical help. If reliance is thought to be placed on any of the information guidance or input provided such information will be expressly confirmed as appropriate to be relied upon. In the absence of any such confirmation no reliance should be suggested or inferred. Members must not disclose information to 3rd parties in anticipation that reliance will be given by non-members.

Non-members must not purport to give advice on behalf of David Brown Tractor Club. If you or someone you know is experiencing difficulties or repeated breakdowns you must seek assistance for an appropriately qualified expert who holds themselves out as such.

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david brown 990 selectamatic hydraulics

Please be aware that your user name and entered location can be seen by all members. We only store information you have entered which is your email address and username, your IP is also stored, we have no access to private passwords.

If you do not agree with your information being stored, please do not register an account, If you wish to unsubscribe at any time please email admin dbtc. My tractor has no live take-off valve. My wrecker has offered me the modified cover plate pictured, calling it a power-beyond plate and saying I can supply whatever I want from that, with the addition of aftermarket spool valves.

Is this a good option? If so could I simply tap into my existing cover plate? He said he welds them, which worries me.Moderators: Segrie61admin. David Brown Tractor Forum Skip to content. Quick links. DB Selectamatic hydraulic problem - help please The place to discuss all matters relating to David Brown Tractors. You will need to register your user name before you can post. If you have already registered could you please make sure that your location details have been completed.

david brown 990 selectamatic hydraulics

County if within the U. Location details helps other members if you need spares, technical advice, or the nearest practical help. If reliance is thought to be placed on any of the information guidance or input provided such information will be expressly confirmed as appropriate to be relied upon.

In the absence of any such confirmation no reliance should be suggested or inferred. Members must not disclose information to 3rd parties in anticipation that reliance will be given by non-members.

Non-members must not purport to give advice on behalf of David Brown Tractor Club. If you or someone you know is experiencing difficulties or repeated breakdowns you must seek assistance for an appropriately qualified expert who holds themselves out as such. Any comments are free of charge and made or posted on an ex gratia basis. No member or non-member may advertise their professional services Any user inactive for more than 3 months will automatically be deactivated, please contact admin dbtc.

Please be aware that your user name and entered location can be seen by all members. We only store information you have entered which is your email address and username, your IP is also stored, we have no access to private passwords.

If you do not agree with your information being stored, please do not register an account, If you wish to unsubscribe at any time please email admin dbtc. CASE loader with 2 lever controls on loader frame. Always had to have RH control lever in full back position for loader to work. Suddenly stopped working except with RH lever in full forward and then will only lift empty bucket - no weight.

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Hydraulic oil and filter has been changed was gungy but made no difference. So loader works only with control in wrong position and no power? Changing levers to work rear linkage etc and back makes no difference. There is no sign of any significant oil leakage anywhere. Sorry for not responding but I was admitted to hospital for emergency surgery the same day I posted and have been in and out for more treatment since.

Not had a chance or been well enough to do anything on the since. Been trying to tinker with some help from a friend just recently but have had trouble getting the cover off the by-pass valve.

Have now got this weight off and the rear linkage will lift heavy weight BUT only with the control lever forward i. I was told it was a when I bought it but it could easily be I guess. However on the rear linkage when the control lever is forward the links go UP and when it is back they go DOWN which is the reverse obviously of what they used to do.

Yes by the way, Northants is in the UK, unless someone decides to go for independence. I think the connection must be at least partially broken. Photo attached. So I guess it could be stuck in TCU? Although might have to tackle the by-pass valve as well. But it does seem odd that the control lever seems to be making the lift work back to front i.

I can't find anyone locally who knows about DB's - just Fergies and such. I am not convinced this is the solution or that he is right - or if it i even worth it. Advice welcome please.Hydraulics was an area in which l had little personal involvement so I have enlisted the help of Trevor Williams who was in charge of Hydraulic Test at Scar Bottom in Meltham — in compiling this section.

But before we go too far, we should set the scene by describing some of the improvements and differences between the Selectamatic and the Implematic hydraulic systems in a simple and understandable way. The Implematic tractors had height control, depth control and traction control, as did the new Selectamatic system. The lmplematic tractors had the lift and lower valves mounted on the pump, which were located in front of the PTO.

These were operated mechanically with linkages, in height control from a cam on the ramshaft and in depth from a cable mounted on a spring loaded top link assembly.

Trevor recalls that depth control was a little jerky and the cable on the top link could be vulnerable to damage. Height control was not that efficient and could cause the oil to overheat. The Selectamatic tractors had the valves located in the right-hand side of the rear axle, and a cam on the end of the ramshaft relayed height control.

A dump valve, not needed on Implematic tractors, was incorporated to lower quickly a tipped trailer or lightly loaded links. The rate of drop could also be adjusted. Taps controlled the early three-way valve but as machining accuracy improved, a spool valve was introduced and this had the added advantage of visibly showing which service was selected. The hydraulic pump on the smaller tractors was mounted in front of the PTO, but on the larger tractors this was driven directly from the front pulley on the crankshaft and mounted in the front extension.

A second pump could also be mounted in this manner where extra flow was required for external equipment. Up to three double-acting take-off valves could be mounted on the rear axle for operating double-acting rams, and some had power loaders operated from these valves. As rear-mounted equipment got larger, especially ploughs, development had to be done on the back end of the tractors.

The lift ram operated the ramshaft from the left-hand side of the rear axle but this tended to produce a twisting effect in the ramshaft, so a linkage support ram was fitted at the right-hand side of the axle.

The paper gaskets — used between the PTO case and axle, and the axle and the mainframe — were discovered to be extruding, resulting in oil leaks and a loss of bolt torque under the twisting effect produced by long heavy ploughs. Alan Earnshaw was buying sealant products in the early s, and remembers that Loctite came to Meltham with a request to try a new gasket eliminator on a small number of tractors.

Loctite were told that if they wanted to use David Brown tractors to test their products, they would have to offer considerable guarantees in case their products failed in use and caused damage to the tractors.

In the end three tractors, aand were built using gasket eliminator. But under heavy field-testing it was found that, where it replaced paper gaskets around the PTO, the troublesome capillary-type oil leaks were not occurring when a heavy load was placed on the back end. A decision was soon made to use the liquid gasket and eight of us from different departments were sent to the Loctite factory in Hertfordshire on a producttraining course, in order to explore other application possibilities.

David Brown 990 Selectamatic

However, despite the initial promise of the eliminator, it was to be sometime before it became used on the production line and the oil leaks continued. Indeed the oil staining often left a mess around the back end, and, along with the oil stains around the engine block, the power red paintwork took on an ugly look. However, that could not be the case, as our paint specifications had been developed with the American market in mind.

They were more acutely aware of lead contamination than we were and even in the early s we were sourcing our supplies from car paint manufacturers. The new spraying area at Meltham Mills was one of the most modern in the world, and the unions also had a pretty strong outlook on employee safety.

So i for one take the view that the change to black paint work was either a shadow of what was to come with the Case International colour scheme orjust a means to make the oil leaks look less obvious.

The ramshaft and lift arms were stronger and the lift arms had forked ends to attach to the lift. Where the lift rods attached to the lower-links they could be either in the conventional fixed position or could use slotted holes to allow wider implements to float over undulating ground. Telescopic link ends were also provided to enable easier hitching of heavy implements.

Hughie Cartwright first had these on hiswhich he used with a three-furrow reversible plough and found hitching this heavy implement much easier.Moderators: Segrie61admin. David Brown Tractor Forum Skip to content.

Case / David Brown Tractors Part Diagrams

Quick links. You will need to register your user name before you can post. If you have already registered could you please make sure that your location details have been completed. County if within the U.

Location details helps other members if you need spares, technical advice, or the nearest practical help. If reliance is thought to be placed on any of the information guidance or input provided such information will be expressly confirmed as appropriate to be relied upon.

In the absence of any such confirmation no reliance should be suggested or inferred. Members must not disclose information to 3rd parties in anticipation that reliance will be given by non-members. Non-members must not purport to give advice on behalf of David Brown Tractor Club. If you or someone you know is experiencing difficulties or repeated breakdowns you must seek assistance for an appropriately qualified expert who holds themselves out as such.

Any comments are free of charge and made or posted on an ex gratia basis. No member or non-member may advertise their professional services Any user inactive for more than 3 months will automatically be deactivated, please contact admin dbtc. Please be aware that your user name and entered location can be seen by all members.

We only store information you have entered which is your email address and username, your IP is also stored, we have no access to private passwords. If you do not agree with your information being stored, please do not register an account, If you wish to unsubscribe at any time please email admin dbtc.

I now find that the height control push rod has major fault, it is distorted and the harden steel part of it has cracks. The cam is in very good condition with no distortion or wear. Please does anyone know of where I call obtain a replacement height control push rod? If no source of a replacement can be found; I can see that there is quite a lot of spare space around where it fits and wonder about manufacturing one in oversized mild steel!

Anyones thughts would be appreciated. You do not have the required permissions to view the files attached to this post. Please try to find the part at a tractor wrecker. Pick another one up at the wreckers.

The owner Richard Pocock was very thoughtful and knowledgeable on the phone. Even with the virus restrictions the replacement part has arrived quite quickly. He sends world wide with a DB crankshaft about to go to Canada.

Web search Pocock Tractor Supplies. Who is online Users browsing this forum: db2d and 25 guests. Board index All times are UTC.Replaces K, K Replaces K Fits DB,and tractorsl. Fits DB inplematic,and selectamatic tractors. Fits DB selectamatic,synchromatic,and tractors. This David Brown power steering cylinder seal repair kit fits DB, and with hydrostatic steering tractors. This David Brown single hydraulic pump fits DB selectamatic, and synchromatic tractors.

This David Brown switch fits selectamatic,synchromatic,,, turbo, and tractors. Replaces R Fits DB selectamatic,and tractors.

There is a core charge, will call with price. Fits:,Replaces K, Fits: Selectamatic,Synchromatic,,, Turbo Replaces K, Fits:, Replaces K, With Sender Switch Fits: Selectamatic,Synchromatic, Replaces R3, New David Brown hydraulic pump drive shaft. Fits: selectomatic, You can search for a specific tractor part to save time browsing for other parts, or view all of our parts on our David Brown tractor parts page.

If you are looking for used tractor parts you can request information on this from our used tractor parts page. Tractor Front End Loaders. Rear View Backup Camera. How much is your farm tractor worth? Find resale prices for tractors built from through today, with complete specifications and serial numbers.

Store Home Page. Search Page. View Cart.Also a guide to repairs and some other useful tips. Peter Murray have supplied this schematic diagram and the other documents dealing with the Selectamatic hydraulic system.

The procedures described in this article are designed for those without access to diagnostic tools or special knowledge, and should be used in conjunction with previous magazine articles.

Failure of the three-point linkage or an external service to drop can be either mechanically or hydraulically based. Initiate the diagnosis by slackening the bleed screw in front of the lift cylinder housing one complete turn while standing well clear of the linkage.

If the linkage then drops, the problem is hydraulic, and thus you need to go to the procedure described below beginning at Hydraulics 1. If the linkage does not drop, the problem is mechanical, and so you need to begin at the Mechanical section further down the page, again beginning at 1. Robert Walker secretary dbtc. Christine Bennett treasurer dbtc.

David Brown Tractor Club. Shop Forums Membership. Selectamatic Hydraulic System.

david brown 990 selectamatic hydraulics

If linkage then drops, problem solved; if not go to 2. Then cycle the quadrant lever and check for corresponding spool valve movement. If the spool moves, go to 3; if not, go to 5. Check and readjust group 3 linkage adjustments as covered in the Selectamatic Hydraulic section on the DBTC websitethen cycle quadrant lever.

If linkage drops, problem solved; if not go to 4. Problem is sticking latching valve or misaligned sleeve. Remove valve chest from tractor and rectify or replace chest. Check and readjust group 3 linkage adjustments as in 3. If still no drop, problem is sticking or maladjusted spool valve.

Remove valve chest from tractor, remove the two seven-sixteenth spool locknuts, tap out seized spool, lubricate and reset as per etched figure on spool base. Refit to tractor.Click here to help. Other users of howtomendit.

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