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OPTIONAL EQUIPMENT
THRUST BEARING ASSEMBLY:
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: In some cases in water systems with extreme working
water velocities, a Thrust Bearing assembly is installed to
ease operation. If this is neccesary, remove the old Operating
Nut, and Anti Friction Washers and replace with the following
components.
1. Remove the Weathershield Bolt (F1), and Weathershield
(F2) using a 5/16” or (8mm) hexagon key.
2. Remove the Lockplate Screw (F3) and Lockplate (F4)
using a 3/16” hexagon key.
3. Use an AVK Hydrant Wrench or adjustable wrench to remove
the Thrust Nut (F6) and it’s o-rings, (F5) Inner Thrust Nut
O-ring, (F7) Outer Thrust Nut O-ring. Check o-rings for
damage and replace if necessary.
4. Once the old Operating Nut and Anti Friction Washers have
been discarded, verify that the Stop Nut (F11) is secure at
the bottom of the threads of the Upper Stem Rod (F16).
Use the AVK T-Wrench to ensure that the Stop Nut is not
backed off.
5. Replace them with the new Operating Nut (F10), and one
Anti Friction Washer (F8), placed below the Operating Nut
shoulder.
6. Install the Lubrication Hole Seal (F9), into the threaded hole
in the top of the Operating Nut (F10).
7. Install the Thrust Bearing Races, (F69), and Thrust Bearing
(F70), as shown in Fig. 12.
8. Lightly grease the Thrust Nut O-rings (F5&F7), and reinstall
the Thrust Nut (F6). Tighten the Thrust Nut until it is just
snug against the Anti Friction Washer (F8), then back off the
Thrust Nut 1/8 to 1/4 to the first location at which the Lock
Plate (F4) can be installed. NOTE: DO NOT OVER
TIGHTEN THE THRUST NUT (F6).
9. Reinstall the Lock Plate (F4) and Lock Plate Screw (F3). On
hydrants with equipped with a set screw, back off the thrust
nut until the set screw can be reinstalled.
10. Service the hydrant with a food grade grease or oil that
contains no acetate or silicone
Fig. 12
Thrust Bearing Components
F1
F2
F6
F3
F4
F69
F70
F69
F9
F8
F16
F11
F10
F7
F5
Summary of Contents for 2700 SERIES
Page 7: ...page 6 Fig 2 Internal Drain Plugging F55 F51 ...
Page 27: ...page 26 ...
