1957 jd 420c help

Dustya112 · Post by **Dustya112** » Mon Oct 17, 2016 5:11 pm

Hi guys I have a 1957 jd 420c with a loader and just the other day I fired it up and as I started to move it just bogged down and I had to clutch it to get the rpms back up before I could move again, it does it every time I try to turn and doesn't have enough power to turn or use anything but 1st gear. Any suggestions would be helpful thanks

gregjo1948 · Post by **gregjo1948** » Tue Oct 18, 2016 3:36 am

Sounds like the steering clutches might be stuck.

Post by **Lavoy** » Tue Oct 18, 2016 7:41 am

If this is a new occurrence, something has changed, just need to find it. Check ignition, carb, air cleaner, etc.
Lavoy

Dustya112 · Post by **Dustya112** » Tue Oct 18, 2016 8:01 am

Well I cleaned the carb completely and that didn't do a thing, it does still go straight and turn without to much hesitation it's just that the engine losses all power. A friend of mine said he thought it might be the idler is stuck but I'm pretty new with this old girl so that's where I'm stuck

fundytides · Post by **fundytides** » Tue Oct 18, 2016 8:02 am

Have you checked the safety blocks? If it's like a 40c, they can engage if the tracks fill up with "junk" and prevent the crawler from moving. If totally engaged they can stall the tractor.

pop pop · Post by **pop pop** » Tue Oct 18, 2016 8:13 am

condensation problems , this aspect of nature affects gas,fuel,ignition,cap/rotor,the clutches, gauges,bulbs,
you name it ,(our old bones).

so now for the fix, DONT oil the clutches.
and if you warm them up with a torch,
be careful to remember that sprays ignite,
needless to say,
grease and oils do too. so if you do spray something,
try to burn off the residue and dont get any on the clutch disc faces.
also take out the plug on the bottom of the housing ,
helps to get dirt blown out and aide drying.
jab them with a screwdriver to see if you can loosen.unstick,
while steering lever is pulled.(you already know this)
ya know that green monster just wants to be in the nice warm shed.

other members can probably suggest some good fixes too.
one test is to get up against a tree and see if the tracks release when you pull each clutch.
also, im starting to think maybe the "propeller shaft" is corroded,,,help me out here guys, is this a thought?

Post by **Lavoy** » Tue Oct 18, 2016 9:04 am

I think we are getting off track (haha) here. You first need to determine what the problem is. It is definitely not an idler dragging. We also might need some additional info.
Is the engine bogging down due to lack of power, if so it is an engine issue.
Is the engine bogging down due to extreme load on the drivetrain, then it is not an engine issue.
Did this all change suddenly, as in it worked one day, and not the next. If so, what changed overnight? Nothing drivetrain related would just fail while the crawler is sitting.
Does it steer at all? If so, clutches are not the issue. Aside from that, even if it doesn't steer, high drivetrain load is not a stuck clutch issue, only possibly brake bands.
Do you have the parking brake set?
You need to do a lot more diagnosis, and provide a lot more information before we can come up with any sort of reliable guess, right now it is darts on a board.
Lavoy

Dustya112 · Post by **Dustya112** » Tue Oct 18, 2016 9:22 am

Well I was using it to load some black dirt into my dump trailer, it was working ok as I've noticed it really doesn't have much jam to begin with but it all went well, as I was driving it back to the yard I turned and the right track came off, so after an hour I got that back on and tightened a little bit more and I mean a little, so I'm not fighting with that again, as I took off it wouldn't go into anything but 1st without bogging down. I noticed that it used to idle up when it was under load and now it doesn't do that at all it just bogs

pop pop · Post by **pop pop** » Tue Oct 18, 2016 10:40 am

brake stuck?, does the engine run ok? need to follow a process of elimination here.

Dustya112 · Post by **Dustya112** » Tue Oct 18, 2016 11:21 am

Yes the engine runs fine it seems to fire right up but even when I go to lift the bucket under load it seems to kill it as well, that's why I do t think it could be a brake

gregjo1948 · Post by **gregjo1948** » Tue Oct 18, 2016 11:33 am

Try richening the mixture. There should be a screw o n the carb.

Dustya112 · Post by **Dustya112** » Tue Oct 18, 2016 1:11 pm

Ok I'll give that a try thanks

Post by **Lavoy** » Tue Oct 18, 2016 3:54 pm

If the crawler was working up until you lost the track, and then immediately after putting the track back on it does not function the same, then it is related to the track. None of the other things discussed just happened to occur in the short time period in which you were reinstalling the track. My guess is you have it so tight it is causing the drag. You only tighten tracks til 1 1/2" sag.
You may still have some issues as far as power, but none of them contributed to the immediate change in power.
Lavoy

jtrichard · Post by **jtrichard** » Tue Oct 18, 2016 6:05 pm

Dustya112 wrote:Yes the engine runs fine it seems to fire right up but even when I go to lift the bucket under load it seems to kill it as well,

IF it tries to die with clutch in or in neutral as you lift the bucket then it is NOT drive train sounds like carb or fuel

original possum · Post by **original possum** » Tue Oct 18, 2016 8:26 pm

Also check governor action if it won't "idle up".

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1957 jd 420c help

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