JD 450C Hydraulics bit the dust

tazz001 · Jul 23, 2014

78 vintage 450C w 6 way blade. Would like to put a backhoe on it at some point (have the bracket...that's the hard part)

After many years of reliable service the ol yellow machine has lost its hydraulics. It's been a work horse and still has many hours left.

Pump has been weak, couplers/splines has seen better days. It all needs replacing. Would like to upgrade pump output for running backhoe

I really don't want to pay JD dealer pricing so I am reaching out to the 'net for upgrades. prices, part #s, places to buy from. I saw an older post with someone utilizing a cast iron pump.

With all that said I am sure someone out there has already done the research and I am mush minded from looking at pumps and parts #s.

Help a girl out there guys... I am at your mercy! Ohh and for more guy giggles...my hydraulic pump is in an oil soaked box on the kitchen counter and the rusty.crusty couplers are on the kitchen table...and I DON"T care.

JDemaris · Jul 23, 2014

450C takes a generic Cessna pump with a SAEB-2
generic mount and a 7/8" X 13 splined shaft. Same
as used by Case, IH, Ford, and many others. A pump
that makes 28 GPM at high RPMs is what was used
with a backhoe or loader. 2.6 to 2.8 cubic inches
per rev. Something like these . .

http://www.surpluscenter.com/Hydraulics/Hydraulic-
Pumps/Gear-Pumps/2-61-cu-in-CESSNA-25505RSA-HYDR-
PUMP-9-4068-A.axd

http://www.surpluscenter.com/Hydraulics/Hydraulic-
Pumps/Gear-Pumps/2-85-cu-in-85-CESSNA-25506RSA-
HYD-PUMP-9-4069-A.axd

http://www.surpluscenter.com/Hydraulics/Hydraulic-
Pumps/Gear-Pumps/3-12-cu-in-CESSNA-25507RSA-HYD-
PUMP-9-4070-A.axd

tazz001 · Jul 24, 2014

Thanks for the info.

I have found all the drive parts reasonable and now have pump #s to work with.

Thanks for the info. It's much appreciated

tazz001 · Jul 24, 2014

OK now time for the nuts n bolts question on the Cessna pumps.

Fittings? Will we end up having to do a search n destroy mission for new inlet nipple on outlet adapter to OEM steel tubing?

Any info is greatly appreciated. I bow to the JD crawler masters.

JDemaris · Jul 24, 2014

Just measure what you have now and then look at the
specs on the replacement pumps. You might find one
that has the exact same ports or might have to get a
few adapter fittings.

tazz001 · Jul 24, 2014

The man finally has had time to get into the findings.

Our pump is a Cessna 24307 LAD. Yep its a left hand rotation. splines on pump show wear on left not the right.

I once told my ol man in an argument...You'll figure it out, you always do! One of the reasons I keep him around.

DGH · Jul 24, 2014

The backhoe's were usually put on loaders and where designed for the loader hydraulic system.
The loader used a 28 gpm pump with a 2250 psi operating pressure. The dozer used a 15 gpm pump and a 1750 psi operating pressure.

28 gpm is too much for the dozer. It would be too fast which would make fine grading very difficult.

Too make things work on a dozer with the 28gpm pump you need to use a selector valve so you feed one or the other but not both at the same time. When you select the dozer you need a flow regulating valve to reduce the flow to the dozer and bypass the rest to the tank. The issue here is the bypass flow must go through a small opening to reduce the pressure this heats the oil. Not good but you can live with it.
Too set this up you need some one that knows hydraulics!

JDemaris · Jul 25, 2014

We sold many 1010s, 350s, and 450s with the so-called "23 GPM" pumps and dozer setups. It was an option if the machine was going to have extra hydraulic attachments like a rear ripper, remotes, etc. The big pumps worked fine with the dozers. Only issue was blowing off the return hydraulic filters when revved up with cold oil. But that happens with the smaller pumps also. "GPM" for a pump has no meaning unless expressed at a given RPM. Deere used 1.3 cubic-inch-per-rev pumps as standard on many dozers and 2.3 cubic-inch-per-rev pumps as optional pumps on dozers and standard on loaders. Also some bigger pumps up to 2.6 cubic inches.

A 1.3 cubic-inch Cessna flows 17.9 GPM @ 2500 RPM and 9.7 GPM @ 1800 RPM.

A 2.3 cubic-inch Cessna flows 25.5 GPM @ 2500 RPM and 16.3 GPM @ 1800 RPM.

A 2.6 cubic-inch Cessna flows 26 GPM @ 2500 RPM and 18.3 GPM @ 1800 RPM.

A 2.85 cubic-inch Cessna flows 28 GPM @ 2500 RPM and 20 GPM @ 1800 RPM.

DGH · Jul 25, 2014

I think we talking 450C here, and that machine has a rated speed of 2500. The 23 gpm pump was an option for the dozer, usually used when the 9550 hoe was installed. But there were not that many of them make. The most common was the loader with the 9300 hoe. So when looking for a used hoe the most likely one he would find would be the 9300.

JD 450C Hydraulics bit the dust

tazz001

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