page 15
REPAIR PROCEDURES
MAIN VALVE REPLACEMENT:
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.
NOTE: For access to the Main Valve assembly, refer to the "DISASSEMBLY FOR INSPECTION, MAIN VALVE INSPECTION"
on pages 10 and 11.
1. If replacement of the Main Valve (F518), is required, remove the Cotter Pin (F517), and Main Valve Retaining Pin (F516)
from the assembly. Unscrew the Main Valve from the Lower Stem Rod (F510). When installing a new Main Valve,
screw the Lower Stem Rod (F510) into the Main Valve Disc (F518) until it bottoms out in the threads, Then unscrew the
lower stem rod (F510) just enough until the holes line up (you should not unscrew the lower stem rod more than ½ of a
turn). Insert the Main Valve Retainer Pin (F516) into the hole. Insert a Cotter Pin (F517) into the retainer pin hole and
bend cotter pin with pliers so that it won’t come apart. Grease the ears of the main valve disc with a food grade grease.
Note: Make sure cotter pin is bent up against main valve disk so that it will not interfere with, or contact, the valve seat
ring.
2. After greasing the slots on the Valve Seat Ring (F515), slide the Main Valve (F514), and Valve Seat Ring (F515), over
the Lower Stem Rod (5F10), with the “UP” text facing up. Press the slots onto the ears by hand until the top of the ears
flush with top of main valve.
3. Follow the disassembly steps in "DISASSEMBLY FOR INSPECTION, MAIN VALVE INSPECTION", on page 10, in
reverse order for reassembly.
Note: Torque the nozzle section hardware to 60 Ft. Lbs..
