Rebuilt hydraulic pump not pumping

[bcostellotc45d]

One of the seals inside the hydraulic pump was blown which blew the front seal forcing the hydraulic oil into the engine. I removed the hydraulic pump of my TC45D and had it rebuilt with a new seal kit (SBA340293698). I just installed the hydraulic pump and now the pump is not pumping. The FEL won't move, either will the 3PH or the PTO. The fluid levels in the engine and the trans are full. I'm wondering if I need to prime the pump? How should I prime it? Any help would be appreciated!

 

[jabelding]

Make sure you pre fill the Hydraulic filter, run the tractor at an idle then slightly pressurize your hydraulic tank/ transmission with a compressed air blow gun and a rag in the fill port. But just do it lightly don't want to blow out any other seals.

 

[bcostellotc45d]

Thanks jabelding. I'll try it tomorrow.

 

[pmsmechanic]

Take the outlet hose or pipe off and crank the engine till oil comes out. Shut it off and reattach the hose/pipe.

 

[bcostellotc45d]

Thanks for your help!
I finally got back to the tractor and started to remove the hydraulic filter. Just after I broke the seal hydraulic fluid started spilling out of the filter. Thus the filter is full of oil. I loosened the pipe on the high side of the pump so there is about 1/4" gap between the pump and high side flange. I ran the engine for about 30 to 45 seconds. No oil came out. I tried this several times with the same result. Then I removed the suction side pipe to see if the gears inside the pump were turning. I was thinking perhaps the pump shaft was broken and thus the gears were not turning, however the gears were turning. I'm beginning to suspect the pump was not rebuilt correctly even though I had the dealer rebuild it.
How long can I run the engine without moving fluid through the pump? One thing I still want to try is to remove the suction side pipe and cover the hole with my hand and see if there is any suction. I suspect there isn't.
At this point, I'm not sure where to turn or what to do. Any advice is appreciated.

 

[dfkrug]

How long can I run the engine without moving fluid through the pump? One thing I still want to try is to
remove the suction side pipe and cover the hole with my hand and see if there is any suction. I suspect there isn't.
At this point, I'm not sure where to turn or what to do. Any advice is appreciated.

You are correct to be concerned about running your pump without oil going thru it.

Since you have done a lot already, I suggest that you remove the pump and open it up. The
rotor seals in it are complex and need to be installed properly. If the dealer's mechanic did
not send the pump out to a hyd shop, then it certainly may have been rebuilt incorrectly.

I have not done many of these, but here is what they look like inside.

 

[bcostellotc45d]

Thanks dfkrug.
If I can figure out how to post pics here, I have four pics, an illustrated parts breakdown (IPBD), the front seal pic, which is broken then the rear seal pic. The last pic is the Messicks parts list. What I don't understand is what is part 10 and 13 and 12 (on the IPBD) and why I don't have them in my pump. There is only one seal in front of the bushing for the front and rear bushings. I need to remove the pump again and open it to see what seals the dealer replaced. I can only assume this seal kit is for other model pumps. I know my power steering pump has the same exact rebuild kit. Perhaps these seals are used in the PS pump. My only problem with that is you know what happens when you assume!

Is there anyone out there that has rebuilt this pump? What do I need to know to rebuild it myself, other that replacing the seals? Is this covered in any repair manuals?

 

[oldnslo]

bcostellotc,
Main problem with running these pumps dry are the plain bearings seizing to the shaft. I believe some of this style gear pump use rubber seals under the plastic seals for better life? This may be a design change.

 

[dfkrug]

View attachment 513121

I see a lot of aluminum granules in your 4th photo. I suspect that your pump has
ground itself up and needs to be replaced.

 

[pmsmechanic]

Just before you reinstall the pump.... Put a bit of oil on the gears and turn it over by hand. The oil gets all over the gears and seals them so that the pump will prime easier.

 

[bcostellotc45d]

Dfkrug, They are not aluminum granules. That is a powdery substance from the bolts.

I removed the pump today and opened the front cover. I noticed the dealer installed the two rear bushings upside down. If you look at the illustrated parts breakdown from my previous post, you値l notice the left inside of the pump housing comes to a sharp point where the two gears mesh. However the right inside has that sharp point milled flat. I致e included the post mortem pic of the rear of the pump after the dealer rebuilt the pump.

I値l reinstall the bearings and try the pump again this week.

 

[Btown]

Good luck let us know if it works.

 

[Clint S]

I would stop and take it back. If it grenades from running dry they should cover a new one.

 

[dfkrug]

They are not aluminum granules. That is a powdery substance from the bolts.

As you may know, cleanliness is very important. I even use lint-free rags.

Congrats. You may have found your problem. Rebuilding these pumps is not hard, but you do
have to pay attention to how the complex seals go in there.

 

[leonz]

Dfkrug, They are not aluminum granules. That is a powdery substance from the bolts.

I removed the pump today and opened the front cover. I noticed the dealer installed the two rear bushings upside down. If you look at the illustrated parts breakdown from my previous post, you値l notice the left inside of the pump housing comes to a sharp point where the two gears mesh. However the right inside has that sharp point milled flat. I致e included the post mortem pic of the rear of the pump after the dealer rebuilt the pump.

View attachment 513372I値l reinstall the bearings and try the pump again this week.

==================================================================



if they did not replace the center section of that gear pump and by the looks of it they did not I would tell them I want my money back or credit you for the repair expense toward a new pump- those bushings are toast

 

[leonz]

Dfkrug, They are not aluminum granules. That is a powdery substance from the bolts.

I removed the pump today and opened the front cover. I noticed the dealer installed the two rear bushings upside down. If you look at the illustrated parts breakdown from my previous post, you値l notice the left inside of the pump housing comes to a sharp point where the two gears mesh. However the right inside has that sharp point milled flat. I致e included the post mortem pic of the rear of the pump after the dealer rebuilt the pump.

View attachment 513372I値l reinstall the bearings and try the pump again this week.

==================================================================

Take it back and demand a refund, if I had done that I would have been thrown out the door.

The rule for commercial shearing gear pump and motor rebuilds is this:

new shaft
new shaft seal
new shaft seal retainer if it is not sold with the seal
new bearings in pump/motor neck casting
new bronze bearing plate to support gears on neck side and the base side
string oil seal gasket pieces for each of the bronze bushing plates 8 total
new drive gear
new driven gear
new bearings in pump motor/base casting

2 new o ring seals in the grooves milled into both sides of the new center section casting
all four tie bolts are torqued to avoid damaging the o ring sealing gaskets.


Don't mess with it any more, take it back and demand your money back and buy a new pump from someone else.


If they do not refund your money you can and will get it all back and court costs when you take them to small claims court.

 

[bcostellotc45d]

Success at last! It took some time but I was finally able to get back to working on the tractor. I installed the bushings correctly. Every thing inside the pump looked good, no pitting or scratches. I reinstalled the pump on the tractor. It works great!
There is no need to prime the pump. It'll suck the flees off a dog at forty yards.
The dealer promised to replace the seal kit and refund the labor cost (basically $100.00). I've already received the seal kit. I haven't seen the $100.00. Don't know what I'll do there.