Hydromix Logo Drive Train
Bushings and Sheaves
Installation & Removal
Bushing sizes used by Hydromix® can be assembled in either of the two positions shown below.
Position 1   Position 2
Position 1 is the conventional or standard mounting. Position 2, or reverse mounting, may be necessary in some cases.
Cap screw size & thread Foot pounds
wrench torque*
SK 5/16" - 18 10
SF 3/8" - 16 20
E 1/2" - 13 40
F 9/16" - 12 50
Typical usages Usage
exact parts.
Hub Usage
SK 1 7/8" Feed motor shaft
SK 2 1/8" Blend motor shaft
E 2" Feed or blend auger shaft
F 2" Feed or blend auger shaft
Excessive cap-screw torque can cause sheave and/or bushing breakage. The use of lubricants can cause sheave breakage.
  1. Make sure the tapered-cone surface of the bushing and the mating bore of the sheave are free of all foreign substances, such as dirt, excess paint accumulations, metal chips, lubricants, etc.
  2. For position 1 & 2 (whichever applies), line up the unthreaded holes with the threaded holes and insert cap screws with lock washers engaging only two or three threads.
  3. With the key in the shaft keyway, slide the loosely-assembled unit onto the shaft and position it for good belt alignment. When installing large or heavy parts in Position 1, it may be easier to mount the key and bushing on the shaft first. Then place the sheave on the bushing and align the holes. Use no lubricants or anti-seize compound on threads or tapered surfaces.
  4. Carefully tighten the cap screws alternately and progressively until the tapers are seated (at approximately half the recommended torque).
  5. Check alignment and sheave runout (wobble) and correct as necessary.
  6. Continue careful alternate and progressive tightening of the cap screws to the recommended torque values shown in the table. Maximum torque should be achieved on each individual bolt only two times in the consecutive tightening.
    Note: When properly mounted, there will be a gap between the bushing flange and sheave after the screws are tightened.
    Caution: Use of lubricants and/or excessive screw torque can cause breakage.
  7. Tighten the set screw, when available, to hold the key securely during operation.
  1. Loosen and remove all mounting cap screws.
  2. Insert cap screws into all threaded hack-screw holes.
  3. Start with the screws furthest from the bushing saw slot and tighten each screw alternately and progressively. Keep turning the screws in small equal amounts until the tapered surfaces disengage.