Tweaked FEL Output

[jwhite]

Second Picture.

 

[Hoeman00]

One place I used the loader arm lift was when I had a Woods 7500 hoe on a Kubota L2900 and had to dig 8.5' deep.
Roll the bucket all the way down and use the arms to lift front end 1.5'+ in the air and it lowers the hoe so I could dig deeper.
On my big hoe when digging on slopes u need to keep hoe level or u will have trouble swinging large loads in bucket and u can't keep a level floor.
I have never seen a loader that couldn't lift the front end w/ arms and not roll.
Well I take that back, the old single acting on the JD B or old Farmalls can't lift the front end.

 

[jwhite]

I don't see what the big deal is anyhow. Seems like it is just set a little low from the factory. Even with it adjusted, you can only lift the front end about an inch with the bucket level with the ground. Then the cylinders are out of travel.

 

[thcri]

I lift my tractor mostly for putting the mower deck on. With the bucket tipped forward I can get about 18" off the ground with no troubles.

murph

 

[Spencer]

</font><font color="blue" class="small">( This was a low-tech method to adjust my pressure relief at the valve but, as the system main relief is supposed to be set at 2150 psi, I think it is safe from a hydraulic system stand point. The only question that remains is will the mechanical systems survive the additional abuse. )</font>

Mrwurm, I have attached a scan of a page out of my TC33D owners manual. It shows the 'hydraulic lift system' setting to be 2133 PSI. I believe this may be referring to the 3-point lift system and not the loader. I will attach a scan from my loader manual next.

 

[Spencer]

Here is a scan of my 7308 owners manual specifications page. It is referring to 1800 PSI as the pressure that the FEL is rated at while at 2600 RPM's.

 

[Spencer]

I went out to my friendly neighborhood hydraulic store and got some parts today (see attachment).

 

[Spencer]

Here is the gauge inline in my FEL lift circuit.

 

[Spencer]

Here is a picture of the gauge reading 1775 PSI at 2700 RPM (I forgot that the rated RPM was 2600 when I did this test). This is the way my system was set from the factory, I had not made any adjustments yet.

 

[Rowski]

Spencer

How much did that setup cost including gauge?

Thanks

 

[Spencer]

Here is a picture of my adjustment nut. It had never been touched. The nut is a 13 mm and the allen set screw is a good ol' American SAE 1/8".

 

[Spencer]

</font><font color="blue" class="small">( I adjusted my 7308 on a TC33D last night using the method first posted here. It took a little less than a half a turn inward to be able to lift the front without using the curl. Your tractor may vary.
)</font>

I started out with a half turn to see how much that affected the pressure. See Attachment

 

[Spencer]

As a half turn raised the pressure by almost 250 PSI (it's hard to say for sure because my initial 1775 PSI reading was at 2700 RPM and every reading after that was at the correct 2600 RPM) I opted to bring the set screw back to the original setting and try one eighth of a turn instead. See Attachment

 

[Spencer]

So there you have it, I am now at around 1850 PSI at 2600 RPM. I have to go out of town for a week so I won't get to do any more on this for a while but I wanted to post my findings before I left. I figure I will try it like this for a few hours on the hour meter and then test it again. So for all you adventurous guys out there keep in mind that one full turn of that little set screw will probably equal a 500 PSI change.

Spencer200, do you have any input on this?

 

[Spencer]

</font><font color="blue" class="small">( Spencer

How much did that setup cost including gauge?

Thanks )</font>

Rowski, it was around $54 and the friendly store manager assembled it all for me for no extra charge.

 

[Anonymous Poster]

Spencer,

Very Informative, thanks for the effort, the pictures and the post.

 

[thcri]

So Spencer based on what you found, a guy should probably leave it alone. Unless one would buy a gauge and make sure you had room to adjust it. I guess for me mine works pretty good and have no reason to up it.

murph

 

[BigDave]

I think the 1800 psi at 2600rpm may be for comparison sake only.


I broke out my TC33D repair manual and here is what is says:



FRONT (DOUBLE SPOOL) REMOTE VALVE

1. Install a 0-207 bar (0-3000 PSI) pressure gauge to the high-pressure tube, 1. <font color="blue"> (top hyd connection) </font>

2. Start the engine and operate the hydraulic system to warm the hydraulic fluid to normal operating temperature.

3.Set the throttle at full throttle. <font color="blue"> (2800rpm) </font>

4. Move the control lever to lift control-raising position and observe pressure indication on the gauge. Pressure should be 121 bar (1750 psi).

5.If required, adjust the relief valve by loosening the locknut and turning the adjusting screw, refer to items 15 and 16, Figure 8-76.

My additions are in blue.

 

[Spencer]

I started a new thread on this subject over in the New Holland Owning/Operating Forum.

NH 7308 Loader Owners