Here is the expander assembly. I think part of the reason why the central piston pulled out was that there were no cotter pins in the housing. The parts manual shows them as # GB 1407 Pin split and replaced by # 72089 S2 Pin 1/8" x 1-3/4" cotter. If they had been installed it would have limited the amount of travel that the two sliding plungers have. I have marked the various locations with the red arrows for clarification.
The odd thing is that the Maint. manual has no mention of the cotter pins.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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