STILL steers like a barge

[lakespirit]

The gears in the pump look fine. No "O" rings, or seals are bad. Pics show the end of the gear that's driven in the pump, and the part that drives it. (not sure what it's called)
do they look normal. It seems to me that the shaft should be flat where it engages the part that drives it.

Rambling because I don't know where to go from here. Ideas, please???

 

[Egon]

Making a guess it looks like the end of the driver shaft is wore off and not turning the pump?

How hard is it to turn the pump?

Also consider if there is a releif valve or bypass in the system and if it is functioning properly.

 

[milkman]

I think Egon is right I'd bet your problem is the part in pic. 3 .

 

[Bob Rooks]

Egon is correct, and it appears that the driving gear is also worn badly - the female part of the tang drive. I'd be curious to know if the pump deadheaded.

 

[lakespirit]

Is it possible to buy just the two parts that are worn? Pump never deadheaded. Pump turning by hand...that's the "driven" gears, right? If so, it turns fine. What is driving all this stuff?

 

[billbill1]

I bought a new pump when that happened to mine and installed it. I took the old one apart and had it welded back up and machined down so that I would have a future spare. The bolts came loose on mine, that was the cause.

 

[Bob Rooks]

Is it possible to buy just the two parts that are worn? Pump never deadheaded. Pump turning by hand...that's the "driven" gears, right? If so, it turns fine. What is driving all this stuff?

The pump is driven from the accessory drive gear train on the front of the engine which also includes the camshaft and fuel injection pump. All are driven off the crankshaft.
To my knowledge, individual pump parts are not available, except for rebuild kits, which do not include the gears. The drive gear that has the female tang can be purchased separately.

 

[bluechip]

The pump will need to be replaced. The yangdong pump drive leaves a lot to be desired. the large bore in the center of the drive shaft causes the pump to be drivin by the outside edges of the tang... after a while wear causes the type of failure you have had. We have the pump in stock.

 

[Affordable]

If you will give me the overall length of your worn shaft I might have a used replacment,I have a box that I keep bad pumps in and some just have broken pump cases so the shafts are still good.

Tommy
Affordable Tractor Sales
" Your Jinma Parts Superstore "
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[Eagleview]

Who on Earth came up with that mess of an idea to drive a pump ? You can't do any worse than the knuckle heads who designed it , so you may as well have a go at fixing it . I would machine a flat on the face of the old male end . Then i would weld on a piece of key steel to make a small "T" , 1/4" or 5/16" would be about right . It has to run true though , check all the clearances and run it .

On edit , it looks like it has been built up with weld once before . Did you buy it new ?

 

[Rich Waugh]

Good eye on the welds on that shaft end! Seems like there should have been enough flat there to engage, even prior to the weld work, though. Makes me wonder where the misfit is coming from. Almost like that shaft should have been about a quarter of an inch longer to start with, no? So where did that missing 1/4" go? Be nice to know jus twhat the exact dimensions of the parts were specc'ed to be in the first place, eh?

I too would try to cobble together a fix, perhaps by figuring a way to shim something to get the proper engagement on the shaft tang.

Rich

 

[Bob Rooks]

I would fill (weld) the hole in the gear and re-machine the female tang.
I would also check the depth of penetration of the male tang.
I would install a new pump or new gear shaft. Don't bother trying to repair it - not cost effective.
This type of drive isn't very forgiving when not in perfect alignment on a two rotational axis, ie. loose pump.

 

[Turbo]

that gear looks like it's been welded, and not finished, need to build it up with weld and then squire off to fit..better yet buy a new one.. ask Tommy

 

[Ranch_Hand_Supp]

lakespirit ,
What I have seen on the ones that look like that was the driving shaft (engine side) was to short. There are two different driving shaft lengths that will fit in the what the book calls ... liquid pump assembly. A new engine side pump driver slot is solid straight ( no hole in the center).

The blade of the male driven shaft of the pump has been acting as a drill bit in the slot. The metal is so hard it is brittle and chips up..... harder metal than the female slot.

When both are new and the correct length the fit is pretty tight ( little to no slop) & deep and lubed via the engine oil through the tow bearings (don't used sealed bearings). The Slot has a load only in one direction.

To check for proper fit ..... fit the hyd pump and liquid pump assy together in your hands prior to re-install and inspect.

I guessing you have the short shaft ?

The picture shows how to measure and is showing the short liquid pump drive shaft.

A new/good pump with gears and seals cannot be turned by hand ...... but you can with a wrench to line it up on re-assemble.

You need a pump, driver and some gaskets .... possible bearings (two)??

Let us know.

Ronald
Ranch Hand Supply

 

[Ranch_Hand_Supp]

I just noticed that the driver above the calipers has started to drill out the slot like yours. See what I mean??



Ronald
Ranch Hand Supply

 

[Eagleview]

Good post Ron , i wonder how many hours an owner can expect to get out of the Dog and pump shaft ? They should have put a bigger blade on the shaft to utilize ALL of the surface area on the Dogs groove . It's not hard to imagine how much torque is applied to that small blade when the hydraulics are at relief . Just like using a small screwdriver in a large screw , it's inevitable the slot will tear out .

 

[lakespirit]

Earlier today I was bored, so I built up the center of the slot on drive gear, filed it straight...built up the tang on male end and ground it down to fit into female side. Put back together and works like a new rig.

 

[Egon]

Good show!

 

[Soundguy]

Who on Earth came up with that mess of an idea to drive a pump ? You can't do any worse than the knuckle heads who designed it , so you may as well have a go at fixing it . ?

What kind of quality were you expecting..

soundguy

 

[Bob Rooks]

FWIW, the Tang Drive system was an early Vickers (British) development prior to WWI. The Chinese did not invent it, they merely adopted it.

Speaking of quality - the vast network of "domestic" tractor dealer repair shops is a standing example that "we" are still in a state of flux in that department too. When the repair shops are all gone (along with stupid mistakes), then we will have mastered "quality".