7045 Air Conditioning
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=73620
Printed Date: 11 Sep 2025 at 7:36am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7045 Air Conditioning
Posted By: Tbone95
Subject: 7045 Air Conditioning
Date Posted: 17 Jul 2013 at 7:11am
| Anyone know what charge should be for 134a? Tractor was converted by previous owner, but the air never worked for me. A buddy came over last night and we got it going. There was still some pressure in the system, so it hadn't leaked all the way down, but he thought it was quite low. There was a bad circuit breaker, which is temporarily jumped out, and we put some charge in, to where he said "where a car would be", and it is making cold. So I guess the question is, rather than the weight of a total charge (though that would be good to know too) what should our pressures be reading? |
Replies:
Posted By: XT in pa
Date Posted: 17 Jul 2013 at 8:11am
|
im not sure but i put 5 cans in mine and it still dont get cold im bout to give up Shawn ------------- 190XT,D17and 7045 |
Posted By: SteveM C/IL
Date Posted: 17 Jul 2013 at 9:54am
| XT ,I could be wrong but I think 5 cans is too much for that system. |
Posted By: ryan(IN)
Date Posted: 17 Jul 2013 at 10:21am
|
If I remember right pressure on the low side should be 20-30 and the high side on like a 85 degree day should be 275-300. Someone can correct me if I'm wrong and I could be. But this should put you towards the right direction. ------------- ryan 1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62 |
Posted By: wekracer
Date Posted: 17 Jul 2013 at 1:02pm
| between 20-30 on the low and add outside timp plus 134 for the high. Example 85 degrees outside temp plus 134 is 219 on the high. Doesn't have to be exact but close,210-230. |
Posted By: ryan(IN)
Date Posted: 17 Jul 2013 at 1:10pm
|
Thanks wekracer. I had a feeling I was a little high on the high side pressures. ------------- ryan 1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62 |
Posted By: Tbone95
Date Posted: 17 Jul 2013 at 2:48pm
Sounds like we got it a little too full? We ended up with 35-40ish, and 285. It was really hot yesterday. By wekracer's rule, should have been around 230. No big deal? Obviously, it leaks a little anyway. . .
btw, that's not where R134 gets its name, is it?
|
Posted By: Gary(WI)
Date Posted: 17 Jul 2013 at 3:17pm
| r134a capacity is 80 percent of an r12 charge On the deeres they were usually 4 lbs and JD said to put in 3.6 lbs and they worked good Gary |
Posted By: Tbone95
Date Posted: 25 Jun 2015 at 12:48pm
|
Never really did get this working good. Cools for ~ 10 minute...kinda...then just warms up. Buddy going to come back over sometime soon. Does anyone have a schematic for the air conditioning on a 7045 or know where I can get one? Google searches pretty much direct me back here so far... |
Posted By: tbran
Date Posted: 25 Jun 2015 at 1:08pm
|
system is Frigidaire and simple, compressor, to condenser to drier to expansion valve to evaporator to compressor. Make sure heater is shut off. Set fan on high and shoot for 225 on a 90 degree day high side and you should see about 20 on the low side with cab door open and fan on high. Shut the door and turn fan on low and the low side should go down to about 10 or 12 if the valve is working. Keep in mind a little moisture in the system will delute performance. Ours, when working with everything clean will actually frost at times on the low pressure at the compressor. Again cores must be clean, drier fresh, good vacuum pulled etc to perform. All systems had a high temp switch on the line in front of the radiator - some had a super heat switch in the compressor - most have been changed. ------------- When told "it's not the money,it's the principle", remember, it's always the money.. |
Posted By: Tbone95
Date Posted: 25 Jun 2015 at 1:16pm
| tbran, Buddy thinks it is an electrical problem, he knows all the pressures and such, he is a licensed air conditioning tech. He was asking me to find a schematic if I could, to see how the compressor gets switched in and so forth. |
Posted By: Jordan(OH)
Date Posted: 25 Jun 2015 at 1:28pm
| Do you have a shutoff valve in heater hose? |
Posted By: 7040
Date Posted: 25 Jun 2015 at 3:49pm
| Electricaly power goes from fan switch too thermostat too psi switch in cab too high psi switch by radiator too compressor. Note I didn't start working on these units until the early 90s some have psi switch in cab under the top some don't .I don't know how they were originally. I have had to take top off and clean coils so the thermostat wouldn't shut them off due too lack of airflow |
Posted By: critter
Date Posted: 25 Jun 2015 at 4:00pm
X2 Had the same problem on our 7060, installed a ball valve in the heater hose, I bet it will solve your problem. |
Jordan(OH) wrote:Posted By: Tbone95
Date Posted: 26 Jun 2015 at 5:09am
So....nobody has a schematic, huh!  No, seriously, thanks for the suggestions. I've printed a couple of these off for my buddy, and I'll put a ball valve in. Did you guys cut the hose and put one in or hard plumb it on one end? Mr. 7040, you said "take the top off and clean coils." Take the top off what, the cab? |
Posted By: wekracer
Date Posted: 26 Jun 2015 at 6:07am
| Yes. Take the top off the cab and blow out the condenser. I will bet its got a lot of dirt in it. It's a good idea to do that every year or two. |
Posted By: ryan(IN)
Date Posted: 26 Jun 2015 at 7:23am
|
Wiring diagrams are in the back of the owners manual. ------------- ryan 1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62 |
Posted By: SHAMELESS
Date Posted: 26 Jun 2015 at 8:35am
| my 7010 is done as of yesterday...boy is it nice having that cold air back again! |
Posted By: SteveM C/IL
Date Posted: 26 Jun 2015 at 10:01am
| ....and while you got the top off,pour water down the drains to see they work.Run a wire down em. |
Posted By: Tbone95
Date Posted: 29 Jun 2015 at 11:33am
|
A bolt on each corner looks like it takes the top off? Do these bolts thread in to something, or do you have to take something apart on the inside to hold on to a nut? Friggin' hinge broke on the door, running it through the field with the door propped open. It's been welded before. Grrr..... |
Posted By: grinder220
Date Posted: 29 Jun 2015 at 12:41pm
| They are threaded into a nut that is held in place with a clip. As long as the clip doesn't break you just unscrew the bolts. If one breaks you'll probably have to cut off the bolt head. |