ice cream machine not getting cold enough stoelting 3000

[comet240]

hi I have a modified milkshake machine converted to ice cream machine old machine but basically works I dunno the right forum but I need help it has a hopper you keep the icream in and that's set at 61psi the AX expansion valve I have it set to 18 to 16psi but my ice cream doesn't get cold enough its -6 needs to get down to -10 the sight glass shows no bubbles so has enough 502 in it but when compressor runs for a long time the entire compressor ices over 1/4 inch of ice what does that mean if no one can help what forum would be good for me

its also stoelting

[comet240]

oh and the expansion valve that's for when the ice cream temperature makes it least -7 to -10 from the temperature prob

[The Viking]

Get a professional in to have a look at it?

[Northdude]

Valve fault or overcharged with refrigerant??