Roper G12-436 - Manual (Page 15)

13. Refer to gear ratio chart to select desired gear ratio.
14. Slide drive gear (46) on drive shaft (32) securing in place using retaining ring (45). Make sure key (Z) and spacer
(47) are in place. The number of teeth or part number is stamped on drive gear (46). On standard units, last two
numbers of part number represent number of teeth on gear.
15. Install gear case (44) and gear case gasket (48) using six hex head cap screws (W), twelve flat washers (X), and
six lockwashers (Y).
16. Press ball bearing (41) onto pinion shaft (42) and install retaining ring (40).
17. Install pinion shaft assembly by sliding small end of pinion shaft into needle bearing (43) at same time gears are
meshed together.
18. Slide bearing retainer (37) assembled with lip seal (39) and bearing retainer gasket (38) into place. Secure
bearing retainer (37) to gear case (44) using four hex head cap screws (U) and four lockwashers (V).
19. Install drive key (A).
20. Install pump coupling half and tighten setscrews on drive key (A).
21. Rotate gear case (44) until coupling halves are accurately aligned. Tighten six hex head cap screws (W).
Assemble coupling and tighten setscrew in motor coupling half.
22. Refill with oil to level of petcock (AC) using Gulf  Senate 375, Mobil  600 W Cylinder Oil, or AGMA No. 7
compounded oil.
Gulf  is a registered trademark of Gulf Oil Company
Mobil  is a registered trademark of Mobil Oil Corporation
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