Welcome to the Piano World Piano Forums
Over 2 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

Gifts and supplies for the musician

Piano Acc. & Gift Items in
Piano World's Online Store
In PianoSupplies.com ,(a division of Piano World) our online store for piano and music gifts and accessories, party goods, tuning equipment, piano moving equipment, benches, lamps and more.

Free Shipping on Jansen Artist Piano Benches
(ad) Pianoteq
(ad) Pearl River
Pearl River Pianos
(ad) P B Guide
Acoustic & Digital Piano Guide
Who's Online
136 registered (Alexander Borro, AndrewJCW, 36251, Albunea, ando, 3times2, 33 invisible), 1658 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
(ad) Estonia Piano
Estonia Pianos
Quick Links to Useful Piano & Music Resources
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano & Music Accessories
*Live Piano Venues
*Music School Listings
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#655940 - 12/31/07 05:11 PM Timing vacuum motor valves rotary?
Don Edward Offline
Junior Member

Registered: 12/31/07
Posts: 2
Loc: retired
I have a 1928 Gulbransen #274376. It has a 3 Double acting bellos motor. I just recovered the bellos and now it's out of time.
It runs in a jerky motion. I need to know to set
the rotary valves. or timing.
Thanks for any help on this matter. The only
number I found that mite help is 147475 under the motor.
Don Edward

#655941 - 12/31/07 05:50 PM Re: Timing vacuum motor valves rotary?
Greg Seagraves Offline
Full Member

Registered: 08/31/07
Posts: 63
Loc: Lawrenceville, GA
The valves should be adjusted so that just as the first valve has rotated to the position that it no longer connects the pneumatic with the main supply, the next valve is in position to begin letting the main supply of air into the next pneumatic. Also, Gulbrnsen motors can be tricky to recover. If it does not move freely without binding, it will also cause it to run rough.

#655942 - 01/01/08 11:03 AM Re: Timing vacuum motor valves rotary?
Don Edward Offline
Junior Member

Registered: 12/31/07
Posts: 2
Loc: retired
What position should the crank be in when you set the valves, then where should the valve
lock in position [with set screw] be in. Hope this makes science.


the Forums & Piano World

Trying Something New with Search
(ad) Yamaha CP4 or CP40 Free Bag
Buy a CP4 or CP40 Get a Free Bag
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ads) PD - WNG - MH
Ad (the Piano Store)
the Piano Store - Restored Steinway Pianos
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
New Topics - Multiple Forums
Scheidmayer Grand Piano
by Sam4
11/29/15 06:54 PM
Using In-ear monitors, what does it really sound like?
by Morodiene
11/29/15 05:41 PM
Changing teachers guilt
by million$glasses
11/29/15 04:38 PM
Is anyone using a Yamaha DBR10 for their pianos/synths?
by Possum SP280Krome
11/29/15 04:23 PM
Kawai K500 pricing
by Soosh
11/29/15 03:38 PM
What's Hot!!
Posting Pictures on the Forums
Forums Rules & Help
on Piano World

The world's most popular piano web site.
Forum Stats
81,594 Registered Members
44 Forums
168,665 Topics
2,470,835 Posts

Most users ever online: 15,252 @ 03/21/10 11:39 PM

Visit our online store for gifts for music lovers

Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
Our Piano Related Classified Ads
Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |

copyright 1997 - 2015 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission