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Does the out side temp. Have any effect on this? If you have a little to much R134 and the out side temp gets to high it will cause high pressure switch to shut it down. If this is it, it will work as the outside temp goes down.

The m915 a1 grill guard is about 3" shorter and the legs are turned back at the base to accommodate the bumper not sticking out as far on the m915 as it does on the m916,7,8,9,20

It is my opinion that it is age that that determines the tubing shape. Low serial numbers have the round tube guards, later have square.

The m915 a1 guard on my m915 a1 will fit my m915, But not my m916 or m920 as they are different. The m915 did not have a grill guard when built. I did add one to my m915 but it needed a m915 a1 guard as the m916 grill guard would not fit. The grills are all the same but the guards are different.

The m915 a1 grills are the same as all the series grills.

M915 a1 grill guards are not the 916 & up guards, and the M 915 had no guard.