Instructions to install Horton DM4300SBL
(Seal-Bearing-Lining Kit for Spring Engaged Series)

Disassembly


  • Using the T-55 Torx bit provided, remove the friction plate. The threads are left hand – turn the T-55 Torx bit counter clockwise while holding the friction plate from rotating. It will help to apply air pressure to the clutch while removing the friction plate.
  • Once the friction plate is removed, hand-tighten the aluminum cage on the left hand threaded bolt. If you applied air pressure in step one remove it now.
  • Remove the lining screws with the T-27 Torx bit provided. Remove the lining.
  • Remove the Aluminum Spring Housing. Use two flat screwdrivers to carefully pry the Aluminum Spring Housing from the pulley. Be careful not to damage the Aluminum Spring Housing while removing – you will reuse this piece.
  • Remove the large rubber seal and wipe the area clean.
  • Remove the retaining clip. Gently remove the Air Chamber Cap, remove the o-ring on the Air Chamber Cap and wipe clean. Remove the face seal from the Air Chamber Cap.
  • Remove the air chamber assembly by first removing the snap ring. Clean the inside of the shaft.
  • Remove the bearing nut with a 2” socket.
  • The pulley will now slide off the shaft. Press out the bearings and save any spacers between the bearings

Installation


  1. Clean all reusable pieces with a clean towel. Do not put the spring housing in a solvent bath.
  2. Press in the two new bearings into the pulley (if there were spacers between bearings in the pulley, reuse them)
  3. Install sheave over the journal bracket
  4. Install the bearing nut. Torque to 125 Ft. Lbs.
  5. Apply o-ring lube to the three o-rings on the air cartridge assembly and install the new air cartridge assembly in the journal bracket
  6. Install the new snap ring over air cartridge assembly
  7. Install the new face seal in the piston. (Torque to 85 Inch lbs.)
  8. Apply o-ring lube to the large thin o-ring and place it in the groove on the Air Chamber Cap
  9. Place the Air Chamber Cap (face seal down) in place and install the retaining clip
  10. Apply o-ring lube liberally to the large red seal. Place the red seal in the pulley, V faces down.
  11. Place the spring housing over the red seal while lining up the bolt holes to the bolt holes in the pulley.
  12. Install the new friction material using the 8 screws provided and the T-27 Torx bit. Torque to 80 Inch Lbs.
  13. Now remove the aluminum cage nut.
  14. Thread on the friction plate over the left hand threads of the bolt. Use the T-55 Torx bit to tighten. Torque to 100 Ft. lbs.


Exploded View and Part Description

Pieces included it the kit
DM 4300SBL

Re-usable pieces