Author Topic: Hydrovac  (Read 396 times)

Ma Deuce

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Hydrovac
« on: January 07, 2019, 04:51:57 PM »
Well thought had my breaks all fixed up but now the Hydrovac is not releasing.if it sits for a while or release pressure on break line it releases. Read all the old threads but was wondering if there was a quick and easy fix.

Mike
Mike
INMVPA
1948 Willy’s CJ 2A
1953 Willy’s CJ 3A
1947 Bantom T3-C trailer
1943 White M3A1

spillmk1

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Re: Hydrovac
« Reply #1 on: January 08, 2019, 05:41:24 AM »
Assume this is an original style series II hydrovac like shown below?
When you say "not releasing", do you mean all the brakes are staying on?

Thanks,
Keith
1955 M38A1
1952 M100
1941 M2A1
MVPA Member

Ma Deuce

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Re: Hydrovac
« Reply #2 on: January 08, 2019, 10:32:01 AM »
Keith mine is the newer style. Yes all breaks are on. I have the original hydrovac that was replaced 30 years ago, going to take apart to see how it works and have some new old stock parts but they look kinda crusty.

Mike
Mike
INMVPA
1948 Willy’s CJ 2A
1953 Willy’s CJ 3A
1947 Bantom T3-C trailer
1943 White M3A1

spillmk1

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Re: Hydrovac
« Reply #3 on: January 08, 2019, 12:41:02 PM »
I have a couple. One old and crusty...and one that was rebuilt probably 15 years ago....which was also crusty when I opened it up.
It wouldn't bleed right and found the piston in the slave cylinder was rusted.
You might have a similar issue with the piston sticking and holding pressure.

Pretty amazing how these old mechanical things work.
Not sure mine will work after my rebuild over the weekend.
But I know a lot more than I did about hydrovacs!!
TM9-1827B is available for download. All you ever wanted to know about these jewels!!

Have fun,
Keith
1955 M38A1
1952 M100
1941 M2A1
MVPA Member

Ma Deuce

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Re: Hydrovac
« Reply #4 on: January 08, 2019, 03:12:05 PM »
Talked to previous owner today and he said he bought the hydrovac that is on ht 25 years ago at a swap meet new old stock for $75. I really don’t know what to do I’m not confident in me rebuilding it.
Mike
INMVPA
1948 Willy’s CJ 2A
1953 Willy’s CJ 3A
1947 Bantom T3-C trailer
1943 White M3A1

colkking

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Re: Hydrovac
« Reply #5 on: January 08, 2019, 05:07:47 PM »
I had my hydrovac rebuilt by Taylor Briggs--did an awesome job!
His facebook page is:  https://www.facebook.com/MilitaryRestorations1/

spec4don

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Re: Hydrovac
« Reply #6 on: January 08, 2019, 10:06:19 PM »
I rebuilt mine, worked for about 6 months then it gave out, sent mine to to Taylor also. It took me 3 different manuals to get all the right info.

Don G.
1941 M2A1 not restored
1942 M3 Diamond T Mostly restored
1943 M3A1 Under restoration
1967 M51A2 Tractor
1945 WC 63 needs restoration
1967 M36 Long wheel base duece
1951 M135 GMC Fire truck conversion

Ma Deuce

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Re: Hydrovac
« Reply #7 on: January 09, 2019, 04:46:34 PM »
Does anyone have Napa part number for modern hydrovac that will work on HT. Read were Chevy C 60 truck will work
Mike
INMVPA
1948 Willy’s CJ 2A
1953 Willy’s CJ 3A
1947 Bantom T3-C trailer
1943 White M3A1

Torque

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Re: Hydrovac
« Reply #8 on: January 09, 2019, 06:38:54 PM »

yd328

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Re: Hydrovac
« Reply #9 on: January 10, 2019, 08:14:01 AM »
I have the above booster in mine and have driven another halftrack that had it also. The brakes work good.

Gary

Ma Deuce

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Re: Hydrovac
« Reply #10 on: January 10, 2019, 01:26:06 PM »
Ordered the PARTNUM=518030 today should get Monday. I can put 4 of these on for the price of one rebuild of original. Can I use the old mounting bracket or have to make one?
Mike
INMVPA
1948 Willy’s CJ 2A
1953 Willy’s CJ 3A
1947 Bantom T3-C trailer
1943 White M3A1

RK1944

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Re: Hydrovac
« Reply #11 on: January 10, 2019, 09:33:39 PM »
I would be very interested in a photo of someones track with the new style hydro-vac installed as well. Im curios how to run the lines going to it/mounting the unit itself.
I have the track stripped down to frame right now and have a lot of working space but no imagination

steve1973

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Re: Hydrovac
« Reply #12 on: January 10, 2019, 10:30:22 PM »
Check out this link.

http://halftrackinfo.com/index.php?topic=1364.msg8380#msg8380

Also, Kevin Lockwood sells these newer hydrovacs.

Steve A.

Torque

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Re: Hydrovac
« Reply #13 on: January 11, 2019, 06:17:44 PM »
There is a picture of the bracket I made under my halftrack build "Iowa M2".