Disassembling Thayer Rotary Valves

November 29, 2014

Disassembling Thayer Rotary Valves


1. Prepare a clean, soft, lint and dirt free area to work.


2. Remove hand slide and all tuning slides and place bell in work area.


3. Remove all screws and/or strings connected to lever and linkages (note: do not remove the

lever from the horn where the spring is located). If you have double rotors, you may want to

keep linkages separated and lay them out in the order you remove them.


4. Separate the valve section from the bell. This will usually involve loosening two brace nuts

and at least one screw. More for bass trombones.


5. Loosen the nut on the brace between the F tuning slide tubes.


6. Unscrew the lock ring and the valve will separate from the housing.


7. Loosen the screw holding the stop arm on the rotor spindle 2 turns. DO NOT remove the

screw too far or it may bend during next step.


8. Gently tap on the head of the screw with a rawhide mallet until the screw touches the stop

arm. Loosen the screw another 2 turns and tap again until the screw touches the stop arm.


9. Repeat number 6 until the stop arm comes off the spindle and the rotor is free from the top





Please reload

Featured Posts

Understanding Brass Chem Cleans

March 1, 2018

Please reload

Recent Posts

November 30, 2014

November 29, 2014

Please reload

Please reload

Search By Tags
Please reload

Follow Us
  • Facebook Basic Square
  • Twitter Basic Square
  • Google+ Basic Square


Monday-Friday    10am-6pm

Saturday               10am-2pm


20436 Lynchburg Highway, Suite J

Lynchburg, Virginia  24502