DE-STA-CO PN500 - Manual (Page 37)

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SECTION 8: Repair and Replace (continued)
8.4.1. “R” Series (Ferguson) Reducers
NOTE: The “R” Series reducer is a double enveloping worm gear type with
components manufactured to Industrial Motion Control’s specifications by
selected vendors. The worm and gear are provided in matched sets with
minimal backlash and installed in housings of Industrial Motion Control’s design.
The identifying number of a reducer consists of the letter “R” followed by a
number and a two-digit number (i.e. R4 15). The “4” indicates the center-to-
center distance between the worm and the gear; the “15” reflects the reduction
ratio. In this example, the ratio is 15:1.
8.4.1.1. Component Removal
8.4.1.1.1. Worm Shaft.
8.4.1.1.1.1. Drain oil and remove cover plate.
8.4.1.1.1.2. Record the distance between the worm bearing
shoulder on the splined end of the shaft (opposite the single
extension end of the shaft) to the finished bore on the cover
side (see Figure 19).
8.4.1.1.1.3. Remove screws and worm bearing caps, keeping
each set of shims with their respective bearing caps.
8.4.1.1.1.4. Tap the worm shaft back and forth axially to move
the outer race of the supporting bearings out of position.
8.4.1.1.1.5. Shaft the worm to the side of the housing, clear of
the gear. Remove the worm through the bearing bore in the
housing.