Ames Fire & Waterworks LFM500, LFM500N, LFM500Z Lead Free Stainless Steel Reduced Pressure Detector Assemblies - Manual (Page 4)

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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:
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 and #4 to relieve pressure within the backflow assembly.
1. After #3 test cock has been opened to relieve pressure, remove #3 test cock from
housing.
When repairing a 6", 8" or 10" device, remove both Victaulic couplers from body.
Slide the downstream Victaulic coupler gasket to the downstream side of the hous-
ing. The up-stream Victaulic coupler gasket stays in place.
2. Remove check/s to be maintenanced.
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
" (8mm). (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 rein-
stallation).
8. To remove spring mechanism, grasp the screwdriver at the center and pull complete as-
sembly 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.
Maintenance Instructions 6" – 10" (150 – 250mm)
Figure A
Figure B
Service Hole