yxrancher
Member
It looks possible to reverse the piston and spring and convert a 901 to a 915? I have a Gravermiester and a Gravermax handpiece.
GRS 901 to 915 hand piece conversion - has anyone done this?
- Thread starter yxrancher
- Start date
mdengraver
~ Elite 1000 Member ~
Contact GRS. They are usually very helpful and can walk you thru it.
Andrew Biggs
Moderator
Give it a go. It'll either work.....or not.
The worst that can happen is the machine catches fire which blows up the house and burns down the neighbourhood.
Cheers
Andrew
The worst that can happen is the machine catches fire which blows up the house and burns down the neighbourhood.
Cheers
Andrew
I disagree, Andrew. I think at most only 3-4 houses would be destroyed.
Ed Westerly
~ Elite 1000 Member ~
I think nosebleed would be the very worst outcome that is possible here. The fire sounds a little far fetched! This is an air tool. It is not gasoline powered!
The #901 and the #915 are the same handpiece. Piston with the spring down its a #901. Piston with the spring up its a #915. The Gravermeister is nothing more than a vacuum pump with a rotating pulse valve on it. The vacuum pulse draws the piston back and the spring drives it down #915. On other GRS air assist applications where a pulse of compressed air drives the piston downward the spring is turned down and serves as a rebound spring #901.
Roger
Roger
yxrancher
Member
Thanks everyone! no sparks or nosebleed, just slightly embarrassed! Ok, now who can help me re-assemble my Cosmi Shotgun?
fegarex
~ Elite 1000 Member ~
Just so you know the 411 on this. Here is the scoop from tech at GRS.
In order to convert a 901 to a 915 he must first determine if he has a polymer coated piston or the 3 ring moly coated piston. If he indeed has the 3 ring moly coated one all he needs is the correct spring 011-362 and the correct hoses, 004-434 and 004-433. If he has the polymer coated piston then he must purchase the 004-406-V2 moly coated piston and the correct spring and hoses. The polymer piston will not work for long because the poly sleeve is only captured on one end of the piston, reversing the impact side will drive the slug out of the poly jacket.
Whenever in doubt, please contact them. They are more than valuable and ready to help.
Rex
In order to convert a 901 to a 915 he must first determine if he has a polymer coated piston or the 3 ring moly coated piston. If he indeed has the 3 ring moly coated one all he needs is the correct spring 011-362 and the correct hoses, 004-434 and 004-433. If he has the polymer coated piston then he must purchase the 004-406-V2 moly coated piston and the correct spring and hoses. The polymer piston will not work for long because the poly sleeve is only captured on one end of the piston, reversing the impact side will drive the slug out of the poly jacket.
Whenever in doubt, please contact them. They are more than valuable and ready to help.
Rex
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