Setting suspension accumulator pressures for the perfect ride.

Half Pipe

Member
@Colliedog how do you depressurise the system before disconnecting pipes, I know there is a screw on the suspension valve, but ours doesn't want to turn. Can it be done through h menus?
 

Colliedog

Member
Location
Dorset
Mi
@Colliedog how do you depressurise the system before disconnecting pipes, I know there is a screw on the suspension valve, but ours doesn't want to turn. Can it be done through h menus?
mine has seized as well so what I have been doing is lifting the front wheels of the ground by pushing the loader down on top of a dolly and driving forward a few yards as long as you exceed 1 kph the system will try and self level by letting pressure out of the system. If you then undo the accumulator a few turns with a bucket underneath and let it drain for half an hour Any remaining pressure should have gone.
 

Colliedog

Member
Location
Dorset
I've had a few p.m.'s on this now but seems there are still a few people confused as to why the Terraglide 1 rides better with a weight on the front even though the ride is improved with the higher pressures. This is because the valve block also contains a pressure relief valve that opens if the suspension hits a large bump so if your carrying weight this will open more frequently.
I started this thread saying getting the correct pressure for the load improves the suspension which it does, but after playing around with different accumulators at the weekend it does seem that a line of varying pressure accumulators absorbs the most shocks and give the best ride. I can see why CNH engineered it this way, as the suspension has many functions. The low pressure accumulator helps maintain contact with the ground for improving draft applications and safety when carrying rear linkage loads as well as providing some shock absorbsion when compressed. The pressure relief valve then takes care of large shocks but this does seem to leave some scope in the system for improvement which has now been proved.
 
@Colliedog Very interesting thread! Thanks for sharing your work and research to date.

I have driven a few T6 and T6000 series 6 pot NHs and always thought the front suspension seemed to be doing very little in comparison to the John Deere TLS system.

Have often heard that the best tractor brand as regards suspension is the 4 point sprung Claas cab in combination with the wishbone type Carraro front axle. Have only driven older Temis (with just cab suspension) and Ares with both but thought if anything the Cab on both was very 'bouncy'. Granted springs could be getting weaker and shocks coming to end of life.

Have been on a few R series JD's very impressed with level of comfort on these.

Have heard a few guys on about their disappointment with the comfort of suspensions on the NH T7 series in comparison to the T6 series.

Friend of mine has a TS115. It was a very bouncy and giddy tractor to have to sit on for a day. You would be tired coming off it.

Replaced all 4 corners with set of Michelin Multibibs, put in a new TM type Sears Air Sprung seat and added a full set of weights to the front. It has really transformed the comfort of the tractor.
 

Dcol

Member
Location
Wexico
Very informative thread @Colliedog, this is our first season with New Hollands, jumped in at the deep end with a T7.235 and a 250, moved from 2 Cs130's with the carraro axle which can be a pain but they are super comfortable. Once everthing is sown up around here I reckon we'll be doing a job on them so i'll be surely haunting for some advice??
 

Colliedog

Member
Location
Dorset
Has anyone played with the Mf front suspension? I find mind good with weight on the rear linkage pit doesn’t seem to move much any other time
I haven't got a lot of experience with the Massey Suspension. but the theory will be the same, two or three accumulators should improve the ride. If you can get a pressure gauge on the system and find a working hydraulic pressure I could work out some pre-charge pressures for you.
 

Colliedog

Member
Location
Dorset
Mine are in front of the axle in between front linkage I’m tempted buy a accumulator charging kit anyone got any recommendations?
These are fine for farm use. https://www.ebay.co.uk/itm/UK-400BA...591283?hash=item56d11dfe73:g:aukAAOSwL05d9LPy there are loads on Ebay but make sure you get one with a gauge that suits your requirements and from uk stock. You will also need something called a 5/8 argon adaptor. You can get rent free bottles either from Adams gas or hobbyweld.
 

cosmagedon

Member
Location
North Wales
I've tee'd a test point into mine to see what sort of pressures I'm seeing, I've only been drilling since so its not a broad test yet.

Empty 60bar
Ton weight block - 100bar
Weight block plus front hopper - 120bar
Above plus the drill on the back 20/30 bar

I've only got a 400bar gauge as my smaller ones have gone awol so i struggle to get an accurate reading at lower pressures, however with all that weight and the accumulator on the front linkages it just glides along. It's not as nice empty though, it's been that long and I've tinkered so much I cant remember the pressures in the accumulators now.

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Colliedog

Member
Location
Dorset
I've tee'd a test point into mine to see what sort of pressures I'm seeing, I've only been drilling since so its not a broad test yet.

Empty 60bar
Ton weight block - 100bar
Weight block plus front hopper - 120bar
Above plus the drill on the back 20/30 bar

I've only got a 400bar gauge as my smaller ones have gone awol so i struggle to get an accurate reading at lower pressures, however with all that weight and the accumulator on the front linkages it just glides along. It's not as nice empty though, it's been that long and I've tinkered so much I cant remember the pressures in the accumulators now.

View attachment 871287View attachment 871288View attachment 871289
That's quite interesting, Its a bigger heavier tractor with a larger diameter ram but the pressures in the system are the same a my T6.160. Even though its a more advanced actively controlled system it shows CNH are using the same calculations for this model as well. This should mean there is scope to improve it even though these lwb tractors seem to ride better anyway. My latest theory suggests 3 accumulators set at 15bar 30bar and 60bar would work the best. I've have also tried two accumulators at 15 and 60 as well as 15 and 30 but I haven't tried 30 and 60. It almost seems like the 30bar gets the axle moving more then the 60bar absorbs the shocks the 15bar is there when the axle goes light, for example carrying weight on the back. Seeing as its quite easy for you to do I would suggest you try 30bar and 60bar then consider a 3rd one of 15bar
 

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