Ames Fire & Waterworks LFM300, LFM300N Lead Free Double Check Detector Assemblies - Manual (Page 3)

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 !
Prior to servicing any Ames valve, it is mandatory to shut down the
water system by closing both the inlet and outlet shutoff valves.
After shutoff valves are closed, open test cock #2, #3 & #4 to relieve
pressure within the backflow assembly. (Figure C) on page 4.
1. After #3 test cock has been opened to relieve pressure, remove
#3 test cock from housing.
When repairing an 8" or 10" assembly, remove both Victaulic
couplers from body. Slide the downstream Victaulic coupler gasket
to the downstream side of the housing. The upstream Victaulic
coupler gasket stays in place.
2. Remove check/s for maintenance.
3. Locate the service hole and thread in the service bolt by hand until
it contacts the linkage. (Figure A)
4. Continue to thread in service bolt with the wrench until the service
hole in the linkage is aligned with the service notches on the
spring arbors. (Figure A)
5. Insert the Phillips screwdriver through the arbors and service hole of
the linkage making sure that the tip of the screwdriver extends past
the ends of the arbors by a minimum of
1 /
4
" (6mm). (Figure B)
6. Back out the service bolt until load is transferred to the screwdriver.
Continue to back out the service bolt until sufficient clearance is
achieved to remove the complete spring mechanism.
7. To disconnect linkage, remove retaining clip and pin (store in a
safe location for reinstallation).
8. To remove spring mechanism, grasp the screwdriver at the center
and pull complete assembly straight out and store in a safe place.
9. Reinstall in reverse.
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.
3
Maintenance Instructions 6" – 10"
Figure A
Figure B
Service Hole
6. Closure Sleeve Test Cock with O-ring
7. Closure Sleeve
5. E-clip and Clevis Pin
4. Elastomer Shutoff Disc
2. Second Check Module
8. Sleeve O-ring
3. Check Module O-ring
1. First Check Module
Parts