Any JD 4700 HST mechanics in here ?

[Hoss710]

I bought a used 4700 with HST. Tractor engine runs fantastic. it drives very well except when you let off the forward pedal. it still wants to drive forward ( more or less inching. if I hit the reverse pedal it will slightly move back, then stop and not want to go forward. also if the throttle is up it seems to get worse. So far I replaced the shock absorber on the HST linkage. I have ordered a new return spring. I adjusted the hst shaft 2 1/2 turns back towards the reverse. that has helped a lot but now it's just starting sometimes to slightly inch in reverse instead of forward. if I adust it a flat farther from reverse. then it wants to inch forward again. I bought a service manual a week ago. but it hasn't shown up yet. so anyone been down this road before? and if so can you please share what was wrong?

on a last note I use to be a member on here back around 2005 ( I posted on here a fair amount back then( but for some reason it wouldn't let me log in. ( it's been a number of years since I was on) So I rejoined.

Thank you !

 

[Hoss710]

it sounds like I need my servo motor needs adjusted. see below. borrowed from another post on here.

4000 Series-HST Creep Solution​

{JD Service Bulletin from John Deere 4000 Club Forum}

John Deere 4000 Series Club

Solution Number: 46610

Doc ID: LV46610

Solution Summary: SIB 00-11-35-1 - 4000 Series CUT Tractor With HST Will Creep

Publication Date: Apr 10 2000



Product Affected:

Model 4600 and 4700 HST CUT Tractors:

4600H (160001- 366100)

4600E (166001-369100)

4700H (175001-175186)



Complaint or Symptom:

The tractor creeps forward or reverse when the control pedals are released.

Problem:

1. The hydrostatic control pedal linkage is out of adjustment and will not return to neutral.

2. The hydrostatic servo motor is out of adjustment and will not return to neutral.

Solution:

To determine which problem is at fault:

Disconnect the yoke to bracket. (Fig. 1)
NOTE: Refer to Bulletin 00-11-35-1 for figures 1, 2 and 3.

Start the engine.
Place the shift lever in A range.
Run the engine at high idle.


1. If the tractor does not creep with the linkage disconnected, reconnect the yoke and adjust the linkage as follows:

A. Start the engine.

B. Place the range lever in A range.

C. Run the engine at high idle.

D. Slowly depress the REVERSE pedal to confirm travel is 13mm (0.5 In.) before the tractor begins to move.

E. If the pedal travel is out of adjustment, shut the engine OFF and engage the park brake.

CAUTION: Severe injury or death can result if the engine is not shut off when performing the neutral adjustment.

F. Locate the roller bearing and cam follower under the platform on the right side. (Fig. 1)

NOTE: The roller bearing is attached to an eccentric that must be turned to perform the following adjustments.

G. To change the amount of free play, loosen the locking nut that holds the eccentric to the reverse shaft. (Fig. 2)

H. Use a wrench to rotate the eccentric to move the roller bearing forward or rearward.

1) Forward increases free play.

2) Rearward decreases.

I. Tighten the locking nut.

J. Start the engine, run at high idle and disengage the park brake.

K. Slowly depress the REVERSE pedal to assure travel is 13mm

(0.5 In.) before the tractor begins to move.

L. Repeat steps G through K until the roller to cam is within specification.

M. Move the forward and reverse pedals and listen for the neutral switch "click" when the pedals are released.

NOTE: Engine will not start if the neutral switch does not close when the pedals are released.

N. If no click is heard, adjust the neutral switch to open with 6-9mm (0.25-0.38 In.) of pedal travel.

2. If the tractor moves after the linkage is adjusted, obtain the LVA10365 Hydro Adjustment Kit to adjust the servo motor.

NOTE: The kit provides an instruction to cut an access hole in the clutch housing to provide access to the servo motor adjustment. (Fig 3)

Parts:

LVA10365 1 Kit, Hydro Adjustment

JDG1291 1 Set, Neutral Creep Adjustment Tool (ServiceGard)

Additional Information:

1. JDG1291 Tool Set is required and an essential ASSET tool.

2. The clutch housing access hole was incorporated on HST equipped 4600 and 4700 tractors after the PIN range listed in the heading of this bulletin.

 

[rmonio]

I’ve had the same issue with my 23-year old JD4600 HST. In fact, the external grommet linkage on the pedal broke. Once that was all fixed, then everything was back to normal.

I will say though, that this -60 Windchill and snow did manage to make my front loader cylinders make some noise for a while of use. Not sure how one fixes that. Now that it has warmed up to normal, things have been fine.

-Bob

 

[Hoss710]

thanks for the reply. unfortunately I couldn't preform the test of putting the tractor in the air , and put it in A range ( driveway is a 18% grade from start to finish) so it's at the JD dealership. hopefully I gets some feedback the next day or 2.

 

[rmonio]

I had to take mine to the JD dealership as well…. Fortunately - much like when the roller in the Transmission went out (shift roller had to be replaced), I had it down at the dealership ready for them to look at it. They fixed it for me and we went from there.

While I do my normal maintenance, I usually call the service manager and ask if it is something I should fix (I also replaced a starter once) and he is honest with me on it. From there if it is something they should do, I always take it in.

Good luck and let us know what happened!

-Bob

 

[Hoss710]

Ok got 2 calls with updates today. 1st call was they had adjusted the servo motor , and it still acted like it was sticking. 2nd call was they had replaced the shaft bearing and no change. so they ordered a inner spring that centers the swash plate bearing. they will have that tomorrow.

 

[zzvyb6]

Sounds to me like the wrong hydraulic oil is in there. Supposed to be 30 wgt. Lo-Vis, eh ? 40 wgt can cripple it like this. Found same problem in a Kubota. Generic TCS hydraulic oil was the culprit. Saving money lost more than they bargained for.

 

[Hoss710]

I'll mention it to the dealership. the oil looks fresh and probably replaced by the previous owner ( as there were no recent records of service in JD's data base) thanks for the information! They did mention that the issue was actually with the reverse not forward. said reverse has to much tension not allowing the forward to reach neutral when coming back to center. the pedal forward pushed easy. reverse requires much ( at least 3x the force) more effort.

 

[rmonio]

When I had my issue, it was with the linkage below the pedal that caused the problem as the wear/tear over 20 years caused it to not return the pedals to their normal positions. I could get acceleration if I reached down and pulled the pedal up myself, but otherwise it required repairs to all the linkages so the pedals worked normally.

Sounds like you’re making progress, though. Would love to see pictures of it if possible when complete.

Hang in there!

 

[Tinhack]

Could be as simple as lubricating the pedal pivot and linkage. My shop built Kenbota with a rocker style F/R will creep sometimes. That's how I know it needs lubed again. Seems to need it 2-3 times a year. That reminds me, I need to adjust the parking brake again.

 

[Hoss710]

Thank you for the suggestion. I had lubed it twice myself, and the dealership tried that 1st. he said if he couldn't get it today, he was doing a Dtac on it and see what deere says. he said with the linkage removed he still had a issue, and would replace the internal return spring ( I had already replaced the external return spring and shock absorber before taking it to deere. also used all deere parts). I have a feeling they will be splitting the tractor on this 1.

 

[Hoss710]

Called the dealer today. JD wants them to check the regulators ( forward and reverse) and pump pressures of the hydrostatic transmission . So they ordered a pressure kit. It should be there next week. hopefully this narrows things down.

 

[Hoss710]

It has been some time and out of the blue I get a call from the dearship . My loader ( ordered a new 440R loader for the 4700) Had shown up today. And since they know I won't sign the paperwork til we know what's happening with the Transmission. I had a update on the test they conducted on the HST pressure pumps. 1 of the pumps ( they didn't state which 1 , I'm imaging it's the forward 1) is putting out about 1000 psi. the spec is 6000 psi. so they told me next week they will have a parts list and quote to repair it. I looked at new pumps a few weeks back that JD offers as a original replacement and it's close to $1900.00 a pump. $4600.00 for a new Transmission. so we will see. Hopefully next week I can give everyone another update.

 

[rmonio]

Hang in there, my friend. For those of us with that line of tractor (mine is a 4600 - 23 years old), it’s good to understand what can happen. Good luck!

 

[Hoss710]

Hang in there, my friend. For those of us with that line of tractor (mine is a 4600 - 23 years old), it’s good to understand what can happen. Good luck!

I appreciate that!! hopefully I know something concrete in the next few days. I would really like to get this fixed and back on the farm. I still have my JD 4320 , but it's set up for mostly snow removal right now. come spring both will be out working in the fields . My daughter will primarily be running the 4700 . she really loves its size ( to her it feels smaller then the 4320). I bought the 4700 used , I test drove it and knew there could very well be something up with the transmission, but didn't seem at all terrible to drive. The dealership when they 1st saw it said it was some minor adjustments. And now here we are. Anyways thanks for the support!!

 

[rmonio]

Any news?

 

[Hoss710]

Man you must have been reading my mind !! lol. Stopped in there today and they said they have done all they can do without looking inside. so I told them split the tractor and let's see what's going on . the mechanic was very nervous when I said that. his boss saw it to and said don't worry. we have 3 transmission specialists at our other locations ( they have 18 locations). we will bring 1 down to do the job, that was instant relief for the mechanic. so hopefully tomorrow I get a quote to split it. I also asked them to price out a new transmission just in case. I was such a nice guy. I even gave the manager the JD part number and cost. what I'm not sure is weather the new transmission comes with the pump or not? I told him the original 1 lasted 20 years. I'm expecting the next to last 20 years as well lol . So im hoping and praying we may finally get to what's going on inside. I think there afraid I'm going to walk on the new loader I had ordered for it thats waiting to go on it. but that definitely isn't the case. the mechanic did mention that the primary pressure was what it should be to the high pressure pump. a odd 1 was the 6000 psi relief valves are both relieving under dead heading test ( so unless both are bad there should be 6000 psi in there) but at the port they are only getting 1000 psi?? that's all for now.

 

[Hoss710]

Ok a monkey wrench in the plan. John deere no longer stocks the LVA11405 hydo transmission for my tractor, according to my dealer. I tried buying 1 threw Weingartz Supply . but when I add shipping method it tosses me out. called them directly, said none was in stock at their facility. but because I was out of state they couldn't try to take my order over the phone. he made is sound like there maybe a few out there somewhere but it was uncertain. So now plan Q lol. dig in , see what's going on and pray we can find parts. .

 

[rmonio]

Yikes! We’ll keep our fingers crossed for you!

 

[Brown Dog]

What year model is your 4700 E Hydro ?

I had a 2001 4700 & it was 12spd power reverser trans.

I had a 2012 4720 E Hydro that worked GREAT for mowing grass in B range .

I sold both moving up to 5k series tractors in 2015.