John Deere 425 transmission issue

[JoeJoeL]

Hello, I have a John Deere 425. It has treated me very well for 20 + years now and over the last year or so I have noticed that the transmission slips when I transition from forward to reverse and back. The slipping gets much worse when the mower is running.
Any ideas or comments are greatly appreciated
Thank you

 

[Kish318420]

Pleas tell us what maintenance you have done so far, in the last couple of years.

 

[beenthere]

Yes, especially if transmission fluid and filter have been changed.. need a place to start.

What is the serial number? (xx out for the last couple digits if you'd like).

 

[JoeJoeL]

Hi ok.
I replaced the plastic internal gear more than 15 years ago. I have resealed the plastic valve covers several times over the years still leaking again of course. Replaced the fuel pump about 10 years ago. Replaced the fan belt, replace a leaky hydraulic line, I had the dealer fix a differential lock seal leak about 10 years ago.
Shortly after getting the differential leak fixed another leak popped up just above the transaxle filter. Hoping that this is another common leak that's easy to fix. I believe that is all the work ever done. it has about 2,000 hours I am the original owner I purchased the snow blower and 48 in mower deck when I originally purchased the tractor then purchase the loader a few years later. Outside of the transaxle leak and a little bit of slippage the tractor runs perfect the slippage is minimal now that I am not using the mower or PTO but it will come back when I start using the snowblower. I am planning on finally fixing the transaxle leak and would like to fix the slippage at the same time and anything else you may recommend. I have the JD workshop manual as well
Thank you very much.

 

[JoeJoeL]

Yes all fluids meticulously maintained

 

[Kish318420]

When you say slippage can you describe it in more detail, since this is foot pedal controlled (separate pedals). I wondering about the pedal mount (bushings being dry or corrosion), linkages to the pedals needing adjustment.

 

[JoeJoeL]

When you say slippage can you describe it in more detail, since this is foot pedal controlled (separate pedals). I wondering about the pedal mount (bushings being dry or corrosion), linkages to the pedals needing adjustment.

Anything is possible but it feels like an under pressure problem to me after starting up the PTO during the first few times of going forward and reverse when I push the pedal in reverse it doesn't do anything at first then it catches I get a jerking motion when it first catches. This can happen a few times until everything is fully warmed up then it stops
The serial number is placed somewhere on the tractor is that right? Maybe somewhere on the frame? can't remember
Thank you

 

[weathda]

There should be a sticker on the frame behind the right front tire.

 

[beenthere]

JoJo
Some of your story is not adding up... like you have the service tech manual (assumed that is what you call the JD workshop manual) yet you don't know where the serial number is located ??
Bought it new, or acquired used?

What in the trouble shooting section of the manual have you gone through, and what have you found?

We would like to help..

There is a "free wheeling" lever to dis-engage the tranny. Is it possible this is part of the problem?

 

[JoeJoeL]

Really, why would I be lying? Original owner. Based on your responce this problem doesn't appear to be a common one. OK. I will go though the manual's diagnostics guide and see what it comes up with.

 

[JoeJoeL]

Another individual I talked with several years ago had a similar problem on a high hour machine. It turned out that he had never changed the transaxle fluid or filter. That fixed his problem. I've also seen plugged filters on automatic transmissions on cars do the same before the electronic controls came out.

I wish that was my problem. I change the hydraulic fluid and Filter about every 3 years and only use JD low viscosity High Gaurd.

 

[Kish318420]

The 4X5 series has the Tuff-Torq Pro IHT units. I have attached the K92 which I believe is close to the K91, which is listed as the unit in the series. Tuff-Torq has a lot of units on its web site that can be downloaded.

Looking in the troubleshooting section located in the last few pages for ideas.

You say you have service/shop manual. Does it have TM1517 on the cover?

 

[JoeJoeL]

Thank you I will take a look and get back to you shortly. I'm hoping that it's only the hydraulic pump getting tired when the PTO is engaged. Will likely need to buy a hydraulic pressure gauge to confirm. I'm sure the manual will take me through it step-by-step. Last time I used the manual was when I swapped out the plastic gear a long time ago. Need to go fetch it and dust the cobwebs off of it

 

[JoeJoeL]

Yes the Technical Manual is TM1517 SEPT 99
And the Serial Number is 070000
Thank you