Hydraulic lift mod.

fullpull9 · #1 01-05-2016, 09:04 AM

I have a hydraulic lift unit for a narrow frame and was wondering since you wouldn't normally use lift and angle at the same time, could I make a power angle 42 blade like some have and then use this unit for both lifting the blade and pivoting? I understand how they work as far as supply and demand and starving the last "system" in the circuit but not in "building" a set up like this. Just wasn't sure if I could hook up a double valve? Just a thought.

Yosemite Sam · #2 01-05-2016, 10:56 AM

I believe someone posted pictures of a similar type set-up, where the NF add on unit was used to power two different cylinders.

IIRC, due to the way the NF pump works, it was somewhat cumbersome and it involved moving two levers at the same time to move either of the cylinders. Not an ideal way of accomplishing your goal, but it could work.

You don't mention what model tractor you intend to use this on, depending on the model, there are much easier ways to get the job done. Mounting that pump on anything other than what it was intended for is something of an undertaking in itself.

olds45512 · #3 01-05-2016, 11:19 AM

I think you'd be much better off using a power steering pump or a hydraulic pump and use the rearend as a reservoir, I think modifying the add on unit would be a waste of a hard to find accessory and wouldn't yield great results.

fullpull9 · #4 01-07-2016, 11:05 AM

This will be going on a 71 so most normal options for later units is not available. This is purely a feeler for something I would love to do but I don't know enough about building a whole system so I figured some feed back couldn't hurt. Thanks guys!

litlmikeyl · #5 01-08-2016, 12:24 AM

Quote:

Originally Posted by fullpull9

This will be going on a 71 so most normal options for later units is not available. This is purely a feeler for something I would love to do but I don't know enough about building a whole system so I figured some feed back couldn't hurt. Thanks guys!

I am working on this very thing right now for my 100 to do just what you're thinking - have an aux. circuit for blade power angle or something similar. I haven't built anything yet - still in the planning and rebuild stages as my lift cylinder needs to be rebuilt first before I go farther. That being said, I'm down to two options for the system design, which are:

1) Set the NF lift pump valve in a constant flow position, which would then feed another stand alone hydraulic 2-spool valve (such as a 2-spool from a similar sized green tractor, which I have already). The NF lift pump would then just be that, a pump only. I'd still use the NF lift cylinder and rock shaft in stock form.

2) Since I work in a machine shop, machine a new pump assembly that has two valves in the body instead of one, duplicating the existing valve design and create two smaller valves that will work the same way. Reuse all of the parts from the original pump/lift kit except the pump casing and valve assembly.

My reasons for going either of these routes, more so option #2, is to add more capability to my tractor while retaining the stock look of the options that were originally offered. Kinda like what hot rodders do with their vehicles - hide modern conveniences behind the original sheet metal and trim.

J-Mech · #6 01-08-2016, 12:41 AM

Quote:

Originally Posted by fullpull9

..... but I don't know enough about building a whole system ....

Sometimes it's better to stick to what you know.

Quote:

Originally Posted by litlmikeyl

2) Since I work in a machine shop, machine a new pump assembly that has two valves in the body instead of one, duplicating the existing valve design and create two smaller valves that will work the same way. Reuse all of the parts from the original pump/lift kit except the pump casing and valve assembly.

Do you know how long it would take to machine a pump and valve body from scratch? You must be a hell of a machinist.

Quote:

Originally Posted by olds45512

I think you'd be much better off using a power steering pump or a hydraulic pump and use the rearend as a reservoir, I think modifying the add on unit would be a waste of a hard to find accessory and wouldn't yield great results.

Nailed it.

64fleetside · #7 01-08-2016, 09:45 AM

I have a saginaw p/s pump off a early 70s Chevy truck I've been thinking of mounting on my 104, looks like a fairly easy unit to mount. Might look at one of those.

ol'George · #8 01-08-2016, 10:02 AM

A lot of newer Vehicle systems have a divorced reservoir, making it easy to mount the pump and attach the suction line to the differential fluid supply.
Best to try to provide a mounting that allows the least up-hill flow on the suction side of the pump.

litlmikeyl · #9 01-08-2016, 11:47 AM

Quote:

Originally Posted by J-Mech

Do you know how long it would take to machine a pump and valve body from scratch? You must be a hell of a machinist.

Mediocre at best. It'll take some time, sure, but most of it will be done in a CNC machine of some sort.

If you do decide on the power steering pump route, maybe add the pump used in LT1-Corvettes & Caprices to your list. They ran in reverse rotation due to how they were mounted on the engine and shared a number of parts with the normal rotation pumps of the same era.