Loader specification question

[J_J]

This is a dual self leveling valve with descriptions of the ports on the valve.

For lift and tilt.

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/dev_217388.pdf

Single function leveler, maybe bucket only.

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/dev_217392.pdf

Operating description.

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/dev_217387.pdf

 

[jbwilson]

Since 1 January 2011 all new tractors sold in Australia with FEL requires a self-levelling set up. FELs fitted to SCUTs and CUTs I have seen have mechanical not hydraulic setups. It actually works very well - there isn't even a degree of bucket rotation from ground to full height. Full marks to the designers who paid attention in their geometry lessons.

My mystery block doesn't appear on other tractors, even those fitted with 4 in 1 buckets that have an electric solenoid diverter valve to activate the bucket open and close function. I'm puzzled as to why this block has a pressure adjustment valve that only controls the bucket dump pressure but seems to have no effect on the bucket curl or loader lift function.

Today I performed a test on the FEL lift capacity. The manual for the tractor says that the bucket lift capacity is 700 lbs at pivot point. I assume this capacity is derived from the American Yanmar 2400 SC Cub Cadet. The Australian distributor fits the tractor with an Ansung AL27 loader. However I assume the capacity would be very similiar, say, within 20 lbs or so.

Anyway, the tractor manage to lift a payload of dampish sand weighing 330 lbs to full height. The bucket weighs at a guess about 220 lbs. Total weight 550 lbs with a CG of about 16 inches from the bucket pivot.

The tractor struggled when I increased the payload to 380 lbs. At 2300 rpm it could only lift the loader by 32 inches. At full horsepower of 3100 rpm, the loader struggled on to 40 inches. Tested it at 2600 rpm, and the loader reached 39 inches.

I guess that if the loader capacity was best at full engine power, albeit only by a small amount over the lower engine speed, then there is little scope for improvement to be obtained from adjusting a preesure valve.

Anyway, I assume that lifting 550 lbs with its CG of 16 inches from the bucket pivot point would be within reasonable distance of the tractor's specified capacity of 700 lbs at pivot. I realise that there needs to be more information to make a satisfactory information on my tractor's lifting efficacy.

Thank you for the responses you all have made.

John

 

[J_J]

If you know the pumps rated psi limits, and you can safely operate under those specs, then you can adjust the relief to about 50 to 100 psi below the pumps rated limit.

A 100 psi increase will increase a 2 in cyl, 1 in shaft from 7865 lbs to 8168 lbs. A 314 lb increase.

Put your hyd gage in a tee at the IN port of the FEL valve the hyd system for trouble shooting and monitoring the hyd system.

 

[jbwilson]

J.J.

Thank you. In taking the pressure reading, do I need to apply force to the loader so that it cannot lift?

Also can I attach the pressure guage in a tee to the lift hose leading from the FEL valve instead of the IN port to the valve?

John

 

[J_J]

Yes you can, but that only test one side of the cyl, and only do it momentary.

The way I do it is to install the gage in a tee at the IN port. Then max out the cyl and the relief valve setting will show on the gage.

You may have a relief on the loader valve , on the hyd block, and the 3pt.

Also the gage will show any pressure developed by any hyd operation in the system.

If you raise a load, the pressure developed by the cyl will show on the gage. If you can see that the load is approaching the relief limit, then you have your max load, because after that, the relief valve will be relieving, and no more load potential available.

If you raise the 3pt and max out the cyl, the 3pt relief will activate and the pressure will show on the gage.

 

[jbwilson]

J.J.

Thank you kindly. My 1st service is coming up, and I'll use the dealer to carry out your advice. That way he can warrant against any leaks that may arise from the tee connection. I'm a bit cautious about disconnecting anything on the pump side of the fel valve until the 1st service is carried out. After that service, I'm free to arrange my own repairs and maintenance.

Is it sensible to ask him to install a permanent tee, with a quick discoupler connection so that I can easily connect a pressure guage (Oz spelling) in the future?

After the 1st service - probably around early March - I'll post the pre and post pressure readings on this post in case others are interested.

Just another question - do American hydraulic firms supply hoses with metric fittings? Austalian prices are enormous - eg one simple hose (3/8th id) 18 inches long with JIS female connectors cost nearly $200 Aud. I've already replace 2 under warranty, and imagine sooner or later the others will fail.

John

 

[J_J]

The dealer should do what you want.

Show the dealer these pics.

Surplus Center

Metric Steel Hydraulic Fittings

Compression Fittings for Metric Hydraulic Tubing

Can you find metric adapters in your area?