1992 ford 4630 leaking

I am a first time tractor owner. I have a 1992 ford 4630 and i have a leak im currently waiting on my shop manual in the mail.. if anyone can tell me about this leak I would greatly appreciate it..
 
Here are the pics
a273566.jpg

a273567.jpg

a273568.jpg
 

Brake shaft seals, the ones on my 4000SU are leaking, but not enough to warrant replacing them yet.

If it's just wet and leaves a few drops on the ground keep a check on the oil level in the rear axle and keep using it.
If it's making a pretty good sized puddle you have to drain the rear axle, remove the foot boards then disassemble the pedals and brake rods from the shaft in order to pull the brake shaft out to get to the seals.
Their not hard to replace once the shaft is out.
If your tractor is setup for a narrow track you may have to remove one rear wheel.
 
(reply to post at 07:40:08 07/15/18)

Ok. Man thanks I really appreciate the info.. I will keep a check on the fluids just for future reference what kind of fluid should I refill it with... I know that's a silly question .. but at T.S.C I got some premium universal trans /gear oil is that ok?... again thanks for your info..
 
If brake shaft seals, like D-450 said, it is a relatively easy job. I am not sure if you can, but you may be able to nose the tractor up, drain off some of the hydraulic fluid in this large oil compartment, so it's lower than the bottom of the seal and you don't have to drain it all.

Otherwise, if not, no harm in doing so, drain it all out and when you unscrew that drain plug, you will wear it! I use a disposable plastic cutting board to make a deflector. You can imagine anything that will work to deflect or capture that rush of fluid. There is 11 gallons of fluid in there, be prepared with enough drain pans, put a tarp under them, thick cardboard, speedi dry etc. I let mine drain for a couple of weeks as I had the tractor down until fully serviced, doing the work off hours from my day job. I don't know if you can de-pressurize this compartment, I always open the filler cap on something like this. Seemed it made no difference, got a nice splash when it rushed out.
Same with FWA axle on these, best to rotate the wheels up, loosen the plug when above the oil level, then rotate to drain or you will wear it LOL !

There are 3 inexpensive tools you can get from the hardware store to make removing the seals easy. 1st one is a large screw driver like handle but with a 1" wide chisel/scraper end on it, with a thin enough edge you can easily drive it under the seal with a nylon mallet. Work around the out side and lift the edge out a little. The other tool is similar. I bought a pair of, screw driver handle with a V shaped crows foot on the end, with a bend at the heal, the pair of these make a nice puller when used together. Just pry the seal out and with both techniques to remove this seal, you will not disturb the mating surface in any way, using care of course ! That was my fear, don't want to gouge where the seal is mated and create a leak.

When you get the seals, get the hydraulic oil filter under the foot rest,perfect time to change it.

Re-assembly is easy enough, just slide the seal up the shaft and seat it carefully. I think I just tapped them in with the nylon mallet, evenly. There is a thin star like washer on the rod. I was real careful with when taking this apart, just carefully slide that back as well. Keep an eye on the ring shaped spring that fits in the groove on the seal, the rubber may want to roll out on it, easy to just push it back.

When replacing the fluid, make sure to use the correct type, oil bath brakes, using the wrong kind will cause the brake linings to deteriorate and contaminate the hydraulic system. I did use Ambra from the CNH dealer, but there are equivalents of the same that are fine to use.

Mine leaked for a couple years, when I did a total service on my 4630, I did this repair, and it's so nice to know the fluid level is stable vs checking and topping off all the time. Mine were leaking enough to puddle over time, not heavily, but consistently enough to be annoying. The whole tractor was pretty easy to service, mine has front axle drive.
 
Make sure it meets the specification for this tractor, see my previous post. If you use the wrong fluid, the brake linings will deteriorate and contaminate the hydraulic system.
There are plenty of equivalent fluids to the Ambra type you can get from the CNH dealer, probably less expensive, but I use it exclusively in this tractor, don't mind paying a little more, but that is me, read the labels and use one that is compatible, plenty of them out there for this application.
 
For me it would depend on which hydraulic system your 4630 has.
If it has the older system the oil you have is ok.
If it has the newer system with dual pumps I'd want the better grade of oil.

I've looked at TSC's tractor hyd oil's and chose not to use any of them in my 6610, I only use NH oil or Rural King Cam2 J20-C in the green bucket in that tractor, I'm slowly changing the rest of my tractors over to the J20-C oil.

If your tractor has a hydraulic pump and filter on the left side of the engine like in the photo, it has the newer style hydraulics.

19798.jpg
 
(reply to post at 08:19:10 07/15/18)

Ok.. great. Man thanks. I was worried I would have to do a split.. I will look into it a little further once my shop manual. Is here .. is is still safe to use I still have some brush hogging I would like to do?
 
You can run it, if not leaking profusely, just monitor the oil level and top off as necessary. I had to do this until I was able to make the repair. A slow leak though that leaves a puddle over time like mine did, periodically needed a top off. Remember that oil may spread out onto the immediate area around the seal. On mine I have an underslung exhaust, and the oil and chaff built up, makes a nice fire hazard, so keep it cleaned off until repaired and do carry a fire extinguisher to be safe.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top