plastic guides on service brakes

[gstirling]

Question, while replacing my pancakes(diaphragms) on my front brakes (M936) there is a plastic guide that goes on the push rod (part 7 in TM 9-2330-272-34P-1 fig 184). the manuals do not show where it goes on the rod. does it go up near the piston or down near the wheel hub. mine were mangled up, also do they need any lube? or is the plastic good enough. I was thinking they help support the piston end and keep it centered in the rubber. or do they keep the rod centered in the wedge assembly at the other end? any advice would be appreciated. all the threads I could find focused on the diaphragm end.

 

[simp5782]

Question, while replacing my pancakes(diaphragms) on my front brakes (M936) there is a plastic guide that goes on the push rod (part 7 in TM 9-2330-272-34P-1 fig 184). the manuals do not show where it goes on the rod. does it go up near the piston or down near the wheel hub. mine were mangled up, also do they need any lube? or is the plastic good enough. I was thinking they help support the piston end and keep it centered in the rubber. or do they keep the rod centered in the wedge assembly at the other end? any advice would be appreciated. all the threads I could find focused on the diaphragm end.

I have had a few of them split and come apart when I have taken the rods out. I never could find anything to put back on them. I am sure Euclid makes something but I never called them. As long as you feel it snug down in the base at the wedge it should be fine. Little lube wouldn't hurt on the wedge end. They need it. Especially if the truck sits a good bit.

 

[gstirling]

Simp5782
thanks for the input, what kind of lube do you recommend at the wedge end, grease?? or I think there is a special lube for the wedges specified in the TMs. By the way I found the parts for sale at oshkosh equipment, just no idea of where they go on the rod.

 

[simp5782]

The wedge end. I just use marine grease on all my stuff

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[gstirling]

well found the answer to my own post. got the new plastic guides and they have a little lip on the inside that allows the guides to only go on one way. so the answer is --- they go on the wedge or wheel end.