I still keep these pictures of the old hydro pump off my 107. This is what can happen if you tow or roll your machine too fast. And this was a relatively tame failure, sometimes they break through the aluminum case!
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That being said, don't be afraid to push it around. If you do it slowly and carefully you won't damage anything. They are designed to be pushed around like this.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147
R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)