Shops, Barns, Varmints, and Trucks - HELP!!! Bendix hydrovac

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HELP!!! Bendix hydrovac

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Topic: HELP!!! Bendix hydrovac

Posted By: SteveM C/IL
Subject: HELP!!! Bendix hydrovac
Date Posted: 23 Nov 2022 at 11:02pm

There's a ton of experience on this board. I have a 'fresh" rebuilt (Cardone) hydrovac to put on my 73 C60 grain truck. Problem is they didn't orient the back half of the can with the front half so the mounting brackets don't square up. It has a welded bracket on the back half of booster can which bolts to bracket on frame rail. The front end of the cylinder has a angled threaded boss which bolts to a second frame rail bracket. They are supposed to be in the same plane and are not! Can I loosen the clamp around the diaphram and slip it to position without damaging anything? Very difficult to find any info on these things. On the one hand I should send it back but if you knew the back story you'd understand why I'm reluctant to do that. Any help appreciated.

Replies:

Posted By: DMiller
Date Posted: 24 Nov 2022 at 6:09am

Would send back, diaphrams in these are not all that robust, could wrinkle or tear it.

Posted By: KJCHRIS
Date Posted: 24 Nov 2022 at 9:46pm

I replaced quite a few hydrovacs on GM / IHC trucks built in 60's to mid 80's. Only once tried to do what you're thinking of, it failed shortly after. Rebuilder refused to warranty, said it'd been tampered with. Employer got to buy it wasn't happy with me.

I'd do what DMiller says, take it back & have them get 1 that fits as delivered to you.

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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,

Posted By: Coke-in-MN
Date Posted: 25 Nov 2022 at 12:43pm

Last 60 series Viking cabover I did the brakes on I wnt through 3 boosters and none would work right . Went to a junk yard and found one on a truck that still had brakes that felt like they worked - pulled the unit and it worked fine for the 3 years I kept the truck , and price was $20 for the used unit, lot cheaper than the rebuilt .

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
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Posted By: SteveM C/IL
Date Posted: 27 Nov 2022 at 10:04pm

Seen a youtube of a guy who didn't know anything about what he was doing take one apart. The diaphram looked big and simple pinched at seam like an airbrake pancake.....Lets just say it's working for now....

Posted By: jaybmiller
Date Posted: 28 Nov 2022 at 6:34am

had to google it.... but for sure I'd send it back !!!

brakes are kinda important.....

Whoever rebuilt it didn't reassemble it right.

crazy thing is 'monekywrench' sells them for $220, AmazonCanada $1000 !!

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: HudCo
Date Posted: 30 Nov 2022 at 10:26pm

make sure your rear brakes are adjusted up or that will cause them boosters to ack like they dont work somtimes

Posted By: 200Tom1
Date Posted: 01 Dec 2022 at 12:09am

Hudco. +1 on that 1.

Posted By: SteveM C/IL
Date Posted: 03 Dec 2022 at 9:07pm

Im betting they could use an adjustment. Sounded like plenty of movement inside there while helper pumped and I bled.

Posted By: DMiller
Date Posted: 04 Dec 2022 at 7:11am

Really need to be up on adjust before bleed them, learned that forty years ago.