JD 4520 Cab AC failure

[froggy]

I was very impressed with it - I think the price point might hurt sales. Of course, it might make the E series look reasonable.



D.

No kiddding, when I priced the 5065M I found I could get a Kubota M9540 for the same price. The best bargain at JD is the 5000E series "limited" editions.

 

[ddivinia]

No kiddding, when I priced the 5065M I found I could get a Kubota M9540 for the same price. The best bargain at JD is the 5000E series "limited" editions.

5105M was $11K more than a "left over' 5525 cab.

D.

 

[jenkinsph]

Darin,
Did the tech check the evaporater coil for dirt build up? I ask since I read your thread on the cab filter. The expansion valve will not function correctly if the coil is loaded with dirt.


Steve

 

[ddivinia]

It was clean. We blew out the condenser also - no change.

They are picking it up in the AM.

D.

 

[ddivinia]

They picked up my 4520 and they have determined that the compressor is toast. They think I am not keeping the condenser clean enough and the head pressure popped some valve up in the roof and trashed the compressor. These things get dirty, geez I hope it doesn't self destruct every time get it dirty.

Parts should be in on Wed and I hope to have it back for the weekend round of projects.

D.

 

[jenkinsph]

Darin,
Thanks for the heads up on this, since we have to run the AC to stay in the cab I now know to watch this closely.

It has been very dry and dusty here in New Mexico and I have found this to be more of a problem with my new 4520 cab than my older 820.


Steve

 

[ddivinia]

Darin,
Thanks for the heads up on this, since we have to run the AC to stay in the cab I now know to watch this closely.

It has been very dry and dusty here in New Mexico and I have found this to be more of a problem with my new 4520 cab than my older 820.


Steve

Yeah - I don't buy the dirty condenser story. I cleaned it when he said it was dirty. It was not caked up top to bottom. The lower part was somewhat dirty, but come on.

That is an interesting point. I think the 4520 gets more crap up there than my 5525. I wonder if it is due to the hood design or ride height.

D.

 

[jenkinsph]

One of the things might be that these new designs with turbos, tranny coolers and AC simply need a much higher air flow to work compared to the older tractors. But, again not many issues with my JD110 tlb which has a Laurin cab and Hammond AC. The backhoe of course doesn't have to work around airborne clippings though.


Steve

 

[ddivinia]

One of the things might be that these new designs with turbos, tranny coolers and AC simply need a much higher air flow to work compared to the older tractors. But, again not many issues with my JD110 tlb which has a Laurin cab and Hammond AC. The backhoe of course doesn't have to work around airborne clippings though.


Steve

I can accept that the unit will not work as well if the cooling is compromised, but having the compressor blow up due to that - that is a piss poor design. I need to pull out the tech manual. Surely they have a pressure switch or something to cycle the compressor.

D.

 

[jenkinsph]

Well today I was working on an AC system with a high head pressure and low side was freezing the coil and decided the expansion valve was sticking and was very slow to equalize when turned off. So whether your problem was a dirty condensor is debateable since I would think the mechanic would have a hard time knowing if the expansion valve is functioning properly without first fixing the compressor.



Steve