Hydraulic Problems!

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RichardCoaker
Posts: 99
Joined: Fri Dec 01, 2006 8:56 am
Location: Devon, Dartmoor

Hydraulic Problems!

Post by RichardCoaker » Sat Jun 27, 2009 8:51 pm

Hi,

I'm having problems with my 1694, when the tractor is cold the hydraulics work fine, although it has the hick-ups, but as soon as the tractor warms up the hydraulics don't work unless you rev right up, the spools work fine and pressure is good. Awhile ago i replaced the seals on the dump valve and it was fine for acouple of hours, then back to his old tricks. So the other day, i replaced the dump valve with a second hand one of another tractor, when the tractor is cold it is more sensitive now, but when it is warm, the hydraulic arms will hardy go up with a cultivator or a rake on at full revs.

Just wondering if anyone else has had similar problems or might know a solution!

Many Thanks
Rich
DB 780 Slowly being Restored
DB 1212 Q-Cab
DB 1394 4wd Syncro
DB 1594 4wd Hydra-Shift + Baas loader
DB 1694 Flying Magpie
Case ih 5140
Case ih mx110
McCormick mc115 + Quicke q40 loader

Image

6 in a row, makes it go!

ALSO MR JULY!

raymondjtownend
Posts: 478
Joined: Fri Dec 30, 2005 4:47 pm
Location: nr.skipton north yorkshire

pump

Post by raymondjtownend » Sat Jun 27, 2009 9:09 pm

sounds like the pump needs changing or a bit thicker oil

User avatar
amg
Posts: 16
Joined: Sun Jun 07, 2009 11:32 pm

RE: pump

Post by amg » Mon Jun 29, 2009 9:33 am

Richard, If it was the dump valve you replaced that caused the problem then stay in that area, try the original one back in. The seals are expensive and I am never sure which order they go in, but I usually put the hard white/yellow ring/sleeve at the end.The only way to test the internal (first) pump is at the assister ram port whilst in select and single pump. I am fitting a new pump to one of my 1694's TODAY, but I know for sure its pooped !

User avatar
mburns
Posts: 958
Joined: Sun Apr 13, 2008 8:42 pm
Location: devon

hydraulic pump

Post by mburns » Mon Jun 29, 2009 2:48 pm

Hi Rich

Is the washable filter in the bottom of the back end clean as this will make it hick up as it can`t provide a constant flow of oil due to the blockage in the filter ?

Martin :D

Scooby
Posts: 3957
Joined: Tue Jan 03, 2006 8:16 pm
Location: Warwickshire

Re: hydraulic pump

Post by Scooby » Mon Jun 29, 2009 4:29 pm

mburns wrote:Hi Rich

Is the washable filter in the bottom of the back end clean as this will make it hick up as it can`t provide a constant flow of oil due to the blockage in the filter ?

Martin :D
If that filter was blocked the hydraulics would work better when things were warm than when they were cold.
Image Image

Three is twee, four does snore, but 6 just clicks........Scooby

User avatar
mburns
Posts: 958
Joined: Sun Apr 13, 2008 8:42 pm
Location: devon

hydraulic pump

Post by mburns » Mon Jun 29, 2009 5:56 pm

Not always so scooby , as mine got worse when warm as there were bits in the bowl that seemed to suck onto the filter the more you used it , so when you first started it up the arms and loader would go nearly to the top in one go but as it got warmer they would jump in 1 second bursts as it wasn`t getting the oil flow to the pump .

This may not be the problem with this tractor here but thaught i should post it for others that may have the above problem with their tractor and not check the filter as a result of your comment

Thanks Martin :D

bonserdb
Posts: 700
Joined: Mon Oct 08, 2007 4:00 pm
Location: wales

RE: hydraulic pump

Post by bonserdb » Mon Jun 29, 2009 7:21 pm

if the oil is really bad it could be conjealing when warm.
proud owner of a beloved bonser90d, 880 selectamatic and 1490 2wd synchro, and the mighty 1594!

Scooby
Posts: 3957
Joined: Tue Jan 03, 2006 8:16 pm
Location: Warwickshire

Post by Scooby » Mon Jun 29, 2009 10:26 pm

I stand by what I wrote. If the (washable) filter is blocked it will allow more oil through once it gets warm. If there are extraneous articles in the filter pan that become attached to the filter once things get warm then that's another matter.
Image Image

Three is twee, four does snore, but 6 just clicks........Scooby

User avatar
Madders
Posts: 2433
Joined: Tue Feb 28, 2006 9:52 pm
Location: Holmfirth

Post by Madders » Mon Jun 29, 2009 11:03 pm

liquids congeal as they cool and thin out when warm.
[.................................[/size] Image

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jimc1390
Posts: 2253
Joined: Sun Jan 11, 2009 10:27 pm
Location: cornwall

Post by jimc1390 » Tue Jul 07, 2009 9:46 am

did not think dump valves or hold valves were any good in aonther tractor,ie they made to match each dimensions of the control chest they were intended for
db 990 selectamatic
case ih 1594 com ed
db 1390 gd90 loader

User avatar
erkki
Posts: 2032
Joined: Sun Apr 09, 2006 12:02 pm
Location: North Finland

Post by erkki » Tue Jul 07, 2009 5:32 pm

If the arms are hickupping also when cold there is a leak, which can be the piston seal, leaking hold-release valve, which may be due to leaking spool valve or, in extreme case a leaking pipe or pipe connection between the valve chest and ram.

Is the dump valve of your tractor on the top of the cover on the rhs of the seat? In some later models its on the rhs of the seat, close to where three way valve used to be in eldery models. If it leaks, the arms will hickup for sure.

If the spools work fine and give good pressure independent of temperature of the oil the pump is ok.

I would start by putting new seal to the piston. Then caheck that the pump is not constantly pressurized. If its putting full pressure to the overpressure valve constantly, it will heat up transimission oil, and the pump and wear the pump out quickly. When oil is hot and pump is hot it looses also a great deal of pressure.

The differences between lift valve and hold valve plungers between two tractors are not extreme critical, its important that they slide freely in the bores. If they are any sticky, there can be many kinds of trouble.
If the hold valve is too slim to the bore, it will cause just some hickup.
If the lift valve is too slim to the bore you will hardly see any difference unless its very badly too slim.

Good luck

RichardCoaker
Posts: 99
Joined: Fri Dec 01, 2006 8:56 am
Location: Devon, Dartmoor

Post by RichardCoaker » Tue Jul 07, 2009 7:48 pm

Thanks for your advise guy's, it will be a great help!

Rich
DB 780 Slowly being Restored
DB 1212 Q-Cab
DB 1394 4wd Syncro
DB 1594 4wd Hydra-Shift + Baas loader
DB 1694 Flying Magpie
Case ih 5140
Case ih mx110
McCormick mc115 + Quicke q40 loader

Image

6 in a row, makes it go!

ALSO MR JULY!

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