MUELLER CO. 107 Series User manual
CAUTION: In order to properly identify the various “O” rings and gaskets included in this kit,
carefully observe the locations and relative sizes of “O” rings and gaskets as you remove parts
from the hydrant. As old “O” rings and gaskets are removed, match them up with the new ones by
comparing sizes.
1. Remove Bonnet Bolts. Rotate Operating Nut in opening direction to fully open position while
holding Bonnet to prevent it from turning. This lifts Bonnet o Upper Barrel.
2. Rotate complete Bonnet assembly counterclockwise to detach it from upper Stem threads.
Lift o.
3. Remove socket head Screw Pin and lift o combined Operating Nut/Weather Cap.
4. Remove Hold Down Nut. Empty oil from Bonnet.
5. Lift out Operating Screw, Operating Screw Bearing, Anti-Friction Washer and Stem Nut through
top of Bonnet as a unit.
6. Remove Operating Screw Bearing from assembly and replace Bearing Seal.
7. Remove Operating Stem from Stem Nut.
8. Remove Operating Screw Seal and Anti-Friction Washer from Operating Stem.
9. Install new Anti-Friction Washer and new Operating Screw Seal on Operating Stem in that order.
10. Remove Stem Nut Seal (Quad Ring) and Wiper Ring from lower area of Bonnet. Replace both
with new parts from kit.
11. Remove oil from Stem Nut. Rell with Mueller Hydrant Lubricant (approx. 2 oz.) while part is
setting level. Oil level should be at bottom of oval slots in sides of Stem Nut.
12. Insert Operating Screw into Stem Nut taking care not to spill oil. Engage several threads only.
13. Reinstall Stem Nut into Bonnet with lugs engaging grooves in Bonnet.
Bonnet Repair Kit Instructions
107 Fire Hydrants
(continued)
SCREW PIN
OPERATING NUT/WEATHER CAP
HOLD DOWN NUT
OPERATING SCREW
BEARING
SHOULDER
(STEP 14)
STEM NUT
STEM NUT SEAL
WIPER RING
UPPER STEM SEAL
UPPER BARREL
STEM
Bold items are included in kit.
OPERATING SCREW SEAL
BEARING SEAL
ANTI-FRICTION WASHER
BONNET GASKET
OPERATING SCREW
BONNET
Bonnet Repair Kit Instructions (continued)
By deviating from the above listed instructions, you will void any product warranty and release Mueller Co. and its aliated entities
from any and all liability associated with the installation or use of this product. For details on the product’s warranty, terms, and
conditions, please visit www.muellercompany.com.
Phone: (800) 423-1323
© 2016 Mueller Co., LLC. All rights reserved.
Form 11095 08/16
14. Turn Operating Stem until its thrust collar is slightly below the shoulder inside the Bonnet
(see illustration).
15. Install Operating Screw Bearing, engaging lugs in grooves inside Bonnet.
16. Reinstall Hold Down Nut and tighten.
17. Reinstall Operating Nut and Weather Cap and secure with Screw Pin.
18. Replace Upper Stem Seal and lubricate threads on Stem.
19. Replace Bonnet Gasket.
20. Rotate Operating Nut to fully open position, extending Stem Nut.
21. Position assembled Bonnet on top of stem and rotate clockwise as far as possible.
22. Hold Bonnet to prevent it from turning and rotate Operating Nut in closing direction (this lowers
the Bonnet onto the Upper Barrel). Align bolt holes by rotating Bonnet counterclockwise.
Rotate only enough for alignment.
23. With all bolts in Bonnet, turn Operating Nut using the same torque as normally used to close
hydrant. Tighten all Bonnet Bolts and Nuts. To check Bonnet Gasket Seal, open one hose cap
slightly. Open hydrant until barrel lls with water, tighten hose cap, open hydrant fully, check
gasket for leakage, then turn Operating Nut to fully closed position.
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