page 16
OPTIONAL EQUIPMENT
EXTENSION KITS:
WARNING:
For all of the following repair procedures, the
hydrant must be isolated or the system depressurized and
drained before removing the hydrant components. Failure
to do so may cause pressure to be released resulting in
severe injury or death.
1. Refer to "DISASSEMBLY FOR INSPECTION, MAIN
VALVE INSPECTION" on pages 10 and 11, steps 1
through 7 to access the Upper Stem Rod to disconnect
it.
2. Remove the Coupler Pin and Springpin from the Lower
Stem Rod (F510), and set the Upper Stem Rod and
Breakable Coupling assembly aside.
3. Connect the Extension Coupling (F512), to the Lower
Stem Rod using a new Coupling Pin (F507), and
Springpin (F38).
4. Connect the Extension Stem Rod (F513), to the
Extension Coupling (F512), with a Coupling Pin and
Springpin.
5. Connect the Breakable Coupling/Upper Stem Rod
assembly to the Extension Stem Rod with a Coupling
Pin and Springpin.
NOTE: Ensure that the Springpins are fully engaged on the
Coupling Pins.
6. Verify placement of the Flange O-ring (F73), on the
Lower Barrel, and place the Extension Barrel over the
Upper Stem Rod assembly and align with the bolt holes
on the Lower Barrel.
7. Attach the Extension Barrel with a Standpipe Flange
(F511), and mounting hardware.
NOTE: The text "THIS SIDE UP" faces the Nozzle Section
on both, Standpipe and Breakable Flanges.
NOTE: The Standpipe Flange and Breakable Flange use
the same raw casting. The Breakable Flange has been
machined on the engaging lip to weaken it to allow failure
during a traffic accident. Ensure that the Breakable Flange
is mounted on top of the Extension Barrel.
8. Follow the disassembly steps in "DISASSEMBLY FOR
INSPECTION, MAIN VALVE INSPECTION" in reverse
order for reassembly.
Note: Torque the nozzle section hardware to 60 Ft. Lbs..
F512
F513
F511
F506
F509
Machined lip on
Breakable Flange
Fig. 16
Extension Kit
