Lippert Components Hydraulic Through Frame Slideout - Manual (Page 10)

Rev: 07.09.2014
Page 10
Hydraulic Through Frame Slideout Owners Manual
COMPARING 14.5° AND 20° RACK AND PINION GEARS
SLIDEOUTS
1. Start by measuring the distance between two individual adjacent teeth.
2. Using calipers or a steel rule, measure from the inside edge of one tooth (A), and then measure over to
the inside edge of the next tooth (B) shown in (Fig. 1).
3. The 14.5° rack will measure approximately 0.170 inches (Fig. 2.1). The 20° rack will measure
approximately 0.231 inches (Fig. 3.1).
4. The 14.5° rack will have 4 teeth per inch (Fig 2.2). The 20° rack will have 3 teeth per inch (Fig 3.2).
A
B
Fig. 1 Side View Fig. 2.1 - 14.5° Rack Fig. 3.1 - 20° Rack
1" 1"
Fig. 2.2 - 14.5° Rack Fig. 3.2 - 20° Rack
4 teeth per inch 3 teeth per inch
The simplest way to differentiate between the 14.5° spur gear and the 20° spur gear is the number of teeth on the
gear. Spur gear 122739 (Fig. 4) has 18 teeth. Spur gear 101941 (Fig. 5) has 15 teeth.
Fig. 4 Fig. 5
B A
B A