Mathey Dearman 6SA Saddle Machine - Manual (Page 16)

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7.1 Timing the Ring Gear to the Pinion Gears
Adjusting of the timing requires the purchase of the Axle (Figure 5 item 4).
Note: Redrilling of the old Axle will severely weaken the axle
7.1.1 Remove both Top and Side Tie Rod Handles (Figure 5 item 6 & 7) from the Single and Double Bearing
Bracket Assemblies (Figure 5 items 4 & 5) by removing 3/8-16 x 1-1/4 Hex Head Cap Screws (Figure
5 item 12 ) and Washers (Figure 5 item 13) using a 9/16" wrench.
NOTE: Save Hex Head Cap Screws (Figure 5 item 12) and Washers (Figure 5 item 13).
7.1.2 Remove the Left Crank Handle Assembly (Figure 7 item 2) from the Left Double Bearing Bracket
Assembly (Figure 5 item 5)
7.1.3 Remove 3/8-16 x 7/8” Hex Head Cap Screws (Figure 5 item 11) and 3/8” Washers (Figure 4 item 13)
from the Left Single Bearing Bracket (Figure 5 item 4) with a 9/16” wrench.
Note: Do not loosen the 3/8”-16 x 3/4" & 1 1/4" Hex Head Cap Screws (Figure 5 Items 11) that
hold the Right Single Bearing Bracket (Figure 5 item 4) and Double Bearing Bracket
Assemblies (Figure 5 item 5) to the Saddle (Figure 5 item 1).
7.1.4 Remove the Drive Chain (Figure 5 item 15) from the Sprocket (Figure 6 item 2) of the Left Single
Bearing Bracket Assembly (Figure 5 item 4).
7.1.5 Place the Left Single Bearing Bracket Assembly (Figure 5 item 4) in a vise.
7.1.6 With a 5/32” / 4mm diameter drift punch remove 3/16” x 1 ¼” long Spring Pin (Figure 6 item 11)
from the Sprocket (Figure 6 item 2) and 3/16” x 1” long Spring Pin (Figure 6 item 10) from the Pinion
Gear (Figure 6 item 4).
NOTE: Save 3/16” x 1 ¼” long Spring Pin (Figure 6 item 11) and 3/16” x 1” long Spring Pin (Figure 6
item 10) for reuse at a later time.
7.1.7 With a 5/32” allen wrench loosen the Socket Set Screw (Figure 6 item 7) in the Sprocket (Figure 6
item 2) of the Left Single Bearing Bracket Assembly (Figure 5 item 4).
7.1.8 Remove the Sprocket (Figure 6 item 2) from the axle (Figure 6 item 3) of the Left Single Bearing
Bracket Assembly (Figure 5 item 4).
7.1.9 With a 1/4" / 6mm drift punch drive the Axle (Figure 6 item 3) and Pinion Gear (Figure 6 item 4)
assembly out of the Left Single Bearing Bracket Assembly (Figure 5 item 4).
7.1.10 With a 1/4" / 6mm drift punch drive Axle (Figure 6 item 3) out of Pinion Gear (Figure 6 item 4).
7.1.11 Press the new Axle (Figure 6 item 3) into Pinion Gear (Figure 6 item 4).
Warning: Redrilling of the old Axle will severely weaken the axle
7.1.12 Redrill a 3/16” / 4.7mm hole completely through the center of the flange of the Pinion Gear (Figure 6 item
4) and Axle (Figure 6 item 3).
7.1.13 Install the 3/16” x 1” long Spring Pin (Figure 6 item 10) in the 3/16” / 4.7mm in the drilled hole in the
Pinion Gear (Figure 6 item 4).
7.1.14 Install the Axle (Figure 6 item 3) and Pinion Gear (Figure 6 item 4) assembly into the Left Single Bearing
Bracket Assembly (Figure 5 item 4).
7.1.15 Place the Sprocket (Figure 6 item 2) on the Axle (Figure 6 item 3) with the hub of the Sprocket facing
inward as shown in Figure 6.
7.1.16 Place the Drive Chain (Figure 5 item 15) on the Sprocket (Figure 6 item 2) of the Left Single Bearing
Bracket Assembly (Figure 5 item 4).
7.1.17 When placing the Left Single Bearing Bracket Assembly (Figure 5 item 4) in position on the backside of the
Saddle (Figure 5 item1), rotate the Pinion Gear (Figure 6 item 4) so teeth mesh in the teeth of Ring Gear
(Figure 5 item 3).
7.1.18 Install the 3/8-16 x 7/8” Hex Head Cap Screws (Figure 6 item 11) and 3/8” Washer (Figure 6 item 13)
through the Left Single Bearing Bracket (Figure 5 item 4) and screw into the Saddle (Figure 5 item 1).
7.1.19 The should be a .005” to .007” gap between the Pinion Gear (Figure 6 item 4) and the teeth of Ring Gear
(Figure 5 item 3).