Make: MASSEY FERGUSON
Model: 699 TRACTOR
Engine Size: 6CYL
Refrigerant Type: R-12
Country of Origin: United States
I am replacing my compressor which is a Sanden Sd510, drier and expansion valve. I have flushed the system and purged with dry air from any air drier on compressor. The system was previously an R-12 system which held 3.3lbs. I am converting it to r-134a. Is the refrigerant capacity the same for R-134 and R-12? Also, what about the oil I know I need to use a Pag type oil but which one and how much? Is it the same amount of mineral oil. Thanks for any information.
I & T will know best on which oil to use with the Sanden. I believe it's going to be PAG 46. Same amount unless you have long lines I. E. a van. If you can get away with a full charge that is best. Unless a condenser upgrade has been done I doubt you will be able to have a full charge. So the trade off is poor cooling or poor lubrication flow.
On farm equipment it is especially important to keep clean the fins of the condenser as well as the oil coolers and radiator to have good air flow through the whole stack.
Thanks guys for the replies. I always keep the fins clean to maximize efficiency with condenser and coolers it is a real trouble spot on farm equipment.
Old tractors, like old MARK IV A/C guys, never die.
The SD510 (161 cc displacement) labeled for R-12 is not recommended for R-134a because the aluminum front housing will crack at the higher discharge pressures of above 400 psi (425 psi) encountered with R-134a.
I retrofitted some SD510s with ester oil so that I could charge with a sight glass and to avoid copper plating which is common with conversions when flushing is not performed. I added a 375 psi high pressure cut out switch in the discharge line to prevent aluminum front housing cracking. 2 years later: no problem.
Sanden also makes a SD7H15 (154.9 cc displacement) which is the preferred R-134a compressor precharged with PAG SP15 oil. This is the best answer for you.
Sanden Singapore makes a SD5H16 (161 cc displacement) R-134a version with a cast iron front housing) of the SD510 that is sold in Europe and Asia. It is pre charged with PAG oil, Sanden SP-10 (similar to PAG 46). I have a new SD5H16 available.
A while back, a friend got me to modify a cab and mount it on his Massy F and also add a roof top A/C. I used a York compressor but had to add 2 idler pulleys to keep the belt from jerking off. That was the last time that I ever used a York 2 cylinder compressor again! Piece of SNOT!
Got to ride around the Massy Furgerson (now owned by AgCo) test track in Brazil jungle testing the A/C. The track shook the tractor (and me) pretty well.
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod
Edited: Thu September 09, 2010 at 11:16 AM by ice-n-tropics
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