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What did you get done on your Bolt today? - 2021 and later
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Stovebolt driving report
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Who uses their truck as a truck - 2021 and later

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#506888 Tue Feb 17 2009 03:32 PM
Joined: Sep 2006
Posts: 3,848
I bought a 6400 with grain bed and hoist, 2-speed rear-end, and this assembly is on the firewall my question is what is this.

Joined: Nov 2005
Posts: 6,109
3B Offline
Hy Brad Allen, that is a windshield washer pump, manufactured by "Trico" I believe, hope that helps.

Joined: Sep 2006
Posts: 3,848
I found this information in a GMC book can anyone help fill in the blanks on this, have you ever seen one? The last truck I purchased (1950 6400) had this vacuum pump booster on the firewall. It also had a small rheostat switch with VAC on the dial in the cab. I have found reference to this in my GMC parts book but not Chevrolet (GMC 23.3787 part #2233295) does anybody know how these worked or any more information on them. I assume it is a 6-volt powered vacuum pump that boosts engine vacuum like the optional fuel pump.

Joined: Feb 2008
Posts: 14
Wrench Fetcher
That is a "Trico" vacuum pump.
It assists the vacuum wiper motor with extra vacuum power.

Joined: Jan 2008
Posts: 4,846
They were also commonly added to truck tractors pulling trailers with vacuum brakes. However, they were just about as unreliable as the vacuum brakes were.

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