4
Material/Tool Requirements
• #4 Phillips screwdriver or
3
/
8
" diameter rod, length sufficient to
span diameter of check (See Figures A and B.)
•
1
/
2
" – 13 x 5 fully threaded hex bolt (service bolt)
•
3
/
4
" open end or socket wrench
Instructions
WARNING
!
Before servicing any Ames valve, shut down the water system
by closing both the inlet and outlet shutoff valves. This
is mandatory. After the shutoff valves are closed, open test
cock No. 2, No. 3, and No. 4 to relieve pressure within the
backflow assembly.
1. After test cock No. 3 has been opened to relieve pressure,
remove test cock from the housing.
When repairing a 6", 8", or 10" device, remove both Victau-
lic couplers from the body. Slide the downstream Victaulic
coupler gasket to the downstream side of the housing. The
upstream Victaulic coupler gasket stays in place.
2. Remove the check(s) to be serviced.
3. Locate the service hole and thread in the service bolt by hand
until it contacts the linkage. (See Figure A.)
4. Continue to thread in the service bolt with the wrench until the
service hole in the linkage is aligned with the service notches
on the spring arbors. (See Figure A.)
5. Insert the Phillips screwdriver through the arbors and service
hole of the linkage, making sure the tip of the screwdriver
extends past the ends of the arbors by a minimum of 1/4".
(See Figure B.)
6. Loosen the service bolt until the load is transferred to the
screwdriver. Continue to loosen the service bolt until sufficient
clearance is achieved to remove the complete spring
mechanism.
7. To disconnect the linkage, remove the retaining clip and pin.
(Store both items in a safe location for reinstallation.)
8. To remove the spring mechanism, grasp the screwdriver at
the center and pull the complete assembly straight out. Store
in a safe place.
9. Reverse the order of these steps to reassemble the parts
and housing.
WARNING
!
While the spring mechanism is removed for check servicing, never
pull the screwdriver out or off the support notches on the arbors.
Doing so may cause bodily injuries.
Maintaining the Check Modules
6" – 10"
Figure A
Figure B
Service Hole