DE-STA-CO P1700 - Manual (Page 26)

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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 8).
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.